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GrayPause 1.4: grayscale color breaks for Android

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Timers that switch grayscale off and restore it on their own: presets and
custom h/m/s timers, Quick Settings tile, launcher shortcuts, countdown
notification, reboot recovery, and optional always-in-color apps via an
accessibility service. WRITE_SECURE_SETTINGS is granted once via Shizuku
or adb.

Gradle project for F-Droid with fastlane metadata and a draft fdroiddata
recipe; build.sh keeps the Gradle-free on-phone Termux build.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Loïc Wisniewski 2026-10-04 20:07:49 +02:00
commit 5d7d84eaca
38 changed files with 2419 additions and 1 deletions
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The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# graypause
# GrayPause
Keep your Android phone in grayscale, and take short **color breaks** that end by
themselves, so you never forget to switch grayscale back on.
<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/1_main.jpg" width="240"> <img src="fastlane/metadata/android/en-US/images/phoneScreenshots/2_notification.jpg" width="240">
## Features
- One-tap timers (1/5/10/15/30 min by default), plus custom ones with hours, minutes
and seconds. Long-press any timer to delete it.
- **Quick Settings tile** "Color break": starts a break of the last length used; tap
again to end it early.
- **Launcher shortcuts**: long-press the app icon to start a timer directly.
- **Countdown notification** with *Grayscale now* and *+5 min*.
- **Color apps** (optional): apps like your gallery or camera are always shown in
color. Uses an accessibility service that only sees which app is in front.
- Reboot-safe: a running break is re-armed, or grayscale restored if time ran out.
No internet permission, no tracking, no dependencies beyond the Shizuku client library.
## Setup: the one permission
Grayscale is a secure system setting (`accessibility_display_daltonizer*`), so the app
needs `WRITE_SECURE_SETTINGS`. Android has no switch for it in Settings; grant it once:
- **Shizuku**: start [Shizuku](https://shizuku.rikka.app/), open GrayPause, tap
*Grant with Shizuku*. Shizuku can be stopped afterwards.
- **adb**:
```
adb shell pm grant com.lpw.graypause android.permission.WRITE_SECURE_SETTINGS
```
The grant survives reboots and app updates (not an uninstall).
## Building
Standard Gradle project (JDK 17+, Android SDK 36):
```
gradle assembleRelease # or ./gradlew
```
`build.sh` is an alternative Gradle-free debug build used to develop the app directly
on a phone in Termux (native `aapt2`/`javac`/`apksigner`, `d8` from the SDK). It needs no
Android Studio, and `tools/ZipAlign.java` stands in for `zipalign`.
## F-Droid
Store texts, icon and screenshots are in `fastlane/metadata/android/en-US/` (F-Droid
reads them from the source tree). The draft fdroiddata recipe is
`fdroid/com.lpw.graypause.yml`; releases are tagged `vX.Y`.
## License
GPL-3.0-or-later, see [LICENSE](LICENSE).

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plugins {
id "com.android.application"
}
android {
namespace "com.lpw.graypause"
compileSdk 36
defaultConfig {
applicationId "com.lpw.graypause"
minSdk 33
targetSdk 36
versionCode 5
versionName "1.4"
}
buildTypes {
release {
minifyEnabled false
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_17
targetCompatibility JavaVersion.VERSION_17
}
// F-Droid: no Google-encrypted dependency metadata blob in the APK.
dependenciesInfo {
includeInApk false
includeInBundle false
}
}
dependencies {
def shizuku = "13.1.5"
implementation "dev.rikka.shizuku:api:$shizuku"
implementation "dev.rikka.shizuku:provider:$shizuku"
}

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<?xml version="1.0" encoding="utf-8"?>
<!-- Package, versions and SDK levels live in app/build.gradle (build.sh reads them from there). -->
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
<uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />
<uses-permission android:name="android.permission.USE_EXACT_ALARM" />
<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="moe.shizuku.manager.permission.API_V23" />
<queries>
<package android:name="moe.shizuku.privileged.api" />
<!-- The color-apps picker lists launchable apps. -->
<intent>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent>
</queries>
<application
android:label="@string/app_name"
android:icon="@drawable/ic_launcher"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:exported="true"
android:launchMode="singleTop">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- Target of the long-press launcher shortcuts: starts a break and closes, no UI. -->
<activity
android:name=".ShortcutActivity"
android:exported="true"
android:excludeFromRecents="true"
android:noHistory="true"
android:taskAffinity=""
android:theme="@android:style/Theme.NoDisplay" />
<receiver android:name=".RestoreReceiver" android:exported="false" />
<receiver android:name=".BootReceiver" android:exported="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<service
android:name=".GrayTileService"
android:exported="true"
android:icon="@drawable/ic_tile"
android:label="@string/tile_label"
android:permission="android.permission.BIND_QUICK_SETTINGS_TILE">
<intent-filter>
<action android:name="android.service.quicksettings.action.QS_TILE" />
</intent-filter>
<meta-data android:name="android.service.quicksettings.ACTIVE_TILE" android:value="false" />
</service>
<service
android:name=".AppWatchService"
android:exported="false"
android:label="GrayPause color apps"
android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">
<intent-filter>
<action android:name="android.accessibilityservice.AccessibilityService" />
</intent-filter>
<meta-data
android:name="android.accessibilityservice"
android:resource="@xml/accessibility_config" />
</service>
<!-- Shizuku hands its binder to the app through this provider. -->
<provider
android:name="rikka.shizuku.ShizukuProvider"
android:authorities="com.lpw.graypause.shizuku"
android:enabled="true"
android:exported="true"
android:multiprocess="false"
android:permission="android.permission.INTERACT_ACROSS_USERS_FULL" />
<meta-data android:name="moe.shizuku.client.V3_SUPPORT" android:value="true" />
</application>
</manifest>

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package com.lpw.graypause;
import android.accessibilityservice.AccessibilityService;
import android.content.ComponentName;
import android.content.pm.PackageManager;
import android.view.accessibility.AccessibilityEvent;
/** Tracks the foreground app and hands each change to {@link ColorApps}. */
public class AppWatchService extends AccessibilityService {
/** Package of the activity in front, or null when the service is not running. */
static volatile String foreground;
@Override
public void onAccessibilityEvent(AccessibilityEvent e) {
if (e.getEventType() != AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED) return;
if (e.getPackageName() == null || e.getClassName() == null) return;
String pkg = e.getPackageName().toString();
// Dialogs, keyboards, the notification shade and toasts also fire this event; only
// a real activity means the user switched apps.
if (!isActivity(pkg, e.getClassName().toString())) return;
if (pkg.equals(foreground)) return;
foreground = pkg;
ColorApps.onForeground(this, pkg);
}
private boolean isActivity(String pkg, String cls) {
try {
getPackageManager().getActivityInfo(new ComponentName(pkg, cls), 0);
return true;
} catch (PackageManager.NameNotFoundException ex) {
return false;
}
}
@Override
public void onInterrupt() {}
@Override
public boolean onUnbind(android.content.Intent intent) {
foreground = null;
ColorApps.onWatchStopped(this);
return super.onUnbind(intent);
}
}

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package com.lpw.graypause;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
/** Alarms do not survive a reboot, so a break that was running is re-armed or finished here. */
public class BootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context c, Intent intent) {
if (!Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) return;
long until = Gray.pausedUntil(c);
if (until == 0) return;
if (until <= System.currentTimeMillis()) Gray.resume(c);
else Gray.arm(c, until);
}
}

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package com.lpw.graypause;
import android.content.ComponentName;
import android.content.Context;
import android.content.SharedPreferences;
import android.provider.Settings;
import java.util.HashSet;
import java.util.Set;
/**
* Apps that are always shown in color. Grayscale is switched off on entering one and back on
* on leaving, but only when this feature switched it off: a running timer, or grayscale the
* user turned off themselves, is left alone.
*/
final class ColorApps {
private ColorApps() {}
private static SharedPreferences prefs(Context c) {
return c.getSharedPreferences("state", Context.MODE_PRIVATE);
}
static Set<String> apps(Context c) {
return new HashSet<>(prefs(c).getStringSet("colorApps", new HashSet<>()));
}
static void setApps(Context c, Set<String> apps) {
prefs(c).edit().putStringSet("colorApps", apps).apply();
}
/** True while grayscale is off only because a color app is in front. */
private static boolean holding(Context c) {
return prefs(c).getBoolean("colorHold", false);
}
private static void setHolding(Context c, boolean on) {
prefs(c).edit().putBoolean("colorHold", on).commit();
}
static boolean inColorApp(Context c) {
String fg = AppWatchService.foreground;
return fg != null && apps(c).contains(fg);
}
static void onForeground(Context c, String pkg) {
if (!Gray.canWrite(c)) return;
if (apps(c).contains(pkg)) {
if (!holding(c) && !Gray.isPaused(c) && Gray.isGray(c)) {
setHolding(c, true);
Gray.setGray(c, false);
}
} else {
release(c);
}
}
/** A timer ended: stay in color if a color app is in front, and take over from the timer. */
static boolean keepColorAfterTimer(Context c) {
if (!inColorApp(c)) return false;
setHolding(c, true);
return true;
}
static void onWatchStopped(Context c) {
release(c);
}
private static void release(Context c) {
if (!holding(c)) return;
setHolding(c, false);
if (!Gray.isPaused(c)) Gray.setGray(c, true);
}
static ComponentName component(Context c) {
return new ComponentName(c, AppWatchService.class);
}
static boolean watchEnabled(Context c) {
String list = Settings.Secure.getString(c.getContentResolver(),
Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES);
if (list == null) return false;
String me = component(c).flattenToString();
String shortMe = component(c).flattenToShortString();
for (String s : list.split(":")) {
if (s.equalsIgnoreCase(me) || s.equalsIgnoreCase(shortMe)) return true;
}
return false;
}
/** Switches the watcher on directly; works because the app may write secure settings. */
static boolean enableWatch(Context c) {
if (!Gray.canWrite(c)) return false;
String list = Settings.Secure.getString(c.getContentResolver(),
Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES);
String me = component(c).flattenToString();
String updated = list == null || list.isEmpty() ? me : list + ":" + me;
Settings.Secure.putString(c.getContentResolver(),
Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES, updated);
Settings.Secure.putInt(c.getContentResolver(), Settings.Secure.ACCESSIBILITY_ENABLED, 1);
return true;
}
}

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package com.lpw.graypause;
import android.Manifest;
import android.app.AlarmManager;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.provider.Settings;
import android.service.quicksettings.TileService;
import java.util.ArrayList;
import java.util.List;
import java.util.TreeSet;
/** Grayscale state, the pause deadline, and everything that has to follow it. */
final class Gray {
// Same switches as Settings > Accessibility > Color correction > Grayscale.
private static final String KEY_ENABLED = "accessibility_display_daltonizer_enabled";
private static final String KEY_MODE = "accessibility_display_daltonizer";
private static final int MODE_MONOCHROMACY = 0;
static final String ACTION_RESTORE = "com.lpw.graypause.RESTORE";
static final String ACTION_EXTEND = "com.lpw.graypause.EXTEND";
private static final String CHANNEL = "pause";
private static final int NOTIFICATION_ID = 1;
private Gray() {}
static boolean canWrite(Context c) {
return c.checkSelfPermission(Manifest.permission.WRITE_SECURE_SETTINGS)
== PackageManager.PERMISSION_GRANTED;
}
static boolean isGray(Context c) {
ContentResolver cr = c.getContentResolver();
return Settings.Secure.getInt(cr, KEY_ENABLED, 0) == 1
&& Settings.Secure.getInt(cr, KEY_MODE, -1) == MODE_MONOCHROMACY;
}
static void setGray(Context c, boolean on) {
ContentResolver cr = c.getContentResolver();
if (on) Settings.Secure.putInt(cr, KEY_MODE, MODE_MONOCHROMACY);
Settings.Secure.putInt(cr, KEY_ENABLED, on ? 1 : 0);
}
private static SharedPreferences prefs(Context c) {
return c.getSharedPreferences("state", Context.MODE_PRIVATE);
}
/** Wall-clock millis when grayscale comes back, or 0 if no break is running. */
static long pausedUntil(Context c) {
return prefs(c).getLong("until", 0);
}
static boolean isPaused(Context c) {
return pausedUntil(c) > 0;
}
/** Seconds the Quick Settings tile pauses for: the last duration picked anywhere. */
static int tileSeconds(Context c) {
return prefs(c).getInt("tileSeconds", 300);
}
static void pause(Context c, int seconds) {
prefs(c).edit().putInt("tileSeconds", seconds).apply();
startBreak(c, System.currentTimeMillis() + seconds * 1000L);
}
static void extend(Context c, int seconds) {
long base = Math.max(pausedUntil(c), System.currentTimeMillis());
startBreak(c, base + seconds * 1000L);
}
/** Starting list until the user edits it; every timer, these included, can be deleted. */
private static final String DEFAULT_TIMERS = "60,120,300,600,900,1800";
/** The user's timers, in seconds, ascending, without duplicates. */
static List<Integer> timers(Context c) {
SharedPreferences p = prefs(c);
String raw = p.getString("timers", null);
if (raw == null) raw = DEFAULT_TIMERS + "," + p.getString("custom", ""); // 1.1 kept customs apart
TreeSet<Integer> set = new TreeSet<>();
for (String s : raw.split(",")) {
if (!s.isEmpty()) set.add(Integer.parseInt(s));
}
return new ArrayList<>(set);
}
static void setTimers(Context c, List<Integer> timers) {
StringBuilder sb = new StringBuilder();
for (int t : timers) sb.append(sb.length() == 0 ? "" : ",").append(t);
prefs(c).edit().putString("timers", sb.toString()).remove("custom").apply();
Shortcuts.publish(c);
}
/** "45s", "5 min", "1h 30m", "2m 10s". */
static String label(int seconds) {
int h = seconds / 3600, m = seconds / 60 % 60, s = seconds % 60;
if (h == 0 && s == 0) return m + " min";
StringBuilder sb = new StringBuilder();
if (h > 0) sb.append(h).append("h ");
if (m > 0) sb.append(m).append("m ");
if (s > 0) sb.append(s).append("s ");
return sb.toString().trim();
}
private static void startBreak(Context c, long until) {
prefs(c).edit().putLong("until", until).commit();
setGray(c, false);
arm(c, until);
refreshTile(c);
}
/** Ends the break: grayscale back on, alarm and notification gone. */
static void resume(Context c) {
prefs(c).edit().remove("until").commit();
if (!ColorApps.keepColorAfterTimer(c)) setGray(c, true);
c.getSystemService(AlarmManager.class).cancel(restoreIntent(c));
c.getSystemService(NotificationManager.class).cancel(NOTIFICATION_ID);
refreshTile(c);
}
/** Schedules the restore alarm and posts the countdown. Also used after reboot. */
static void arm(Context c, long until) {
c.getSystemService(AlarmManager.class)
.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, until, restoreIntent(c));
showNotification(c, until);
}
private static PendingIntent restoreIntent(Context c) {
return receiverIntent(c, ACTION_RESTORE, 0);
}
private static PendingIntent receiverIntent(Context c, String action, int code) {
Intent i = new Intent(c, RestoreReceiver.class).setAction(action);
return PendingIntent.getBroadcast(c, code, i,
PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_UPDATE_CURRENT);
}
static PendingIntent openApp(Context c) {
Intent i = new Intent(c, MainActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
return PendingIntent.getActivity(c, 0, i, PendingIntent.FLAG_IMMUTABLE);
}
private static void showNotification(Context c, long until) {
NotificationManager nm = c.getSystemService(NotificationManager.class);
nm.createNotificationChannel(new NotificationChannel(
CHANNEL, "Color break", NotificationManager.IMPORTANCE_LOW));
Notification n = new Notification.Builder(c, CHANNEL)
.setSmallIcon(R.drawable.ic_tile)
.setContentTitle("Color break — grayscale returns soon")
.setWhen(until)
.setShowWhen(true)
.setUsesChronometer(true)
.setChronometerCountDown(true)
.setOngoing(true)
.setContentIntent(openApp(c))
.addAction(new Notification.Action.Builder(null, "Grayscale now",
restoreIntent(c)).build())
.addAction(new Notification.Action.Builder(null, "+5 min",
receiverIntent(c, ACTION_EXTEND, 1)).build())
.build();
nm.notify(NOTIFICATION_ID, n);
}
static void refreshTile(Context c) {
TileService.requestListeningState(c, new ComponentName(c, GrayTileService.class));
}
}

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package com.lpw.graypause;
import android.service.quicksettings.Tile;
import android.service.quicksettings.TileService;
import java.text.DateFormat;
import java.util.Date;
/** Tap: start a color break of the last-used length. Tap during a break: grayscale now. */
public class GrayTileService extends TileService {
@Override
public void onStartListening() {
Tile t = getQsTile();
if (t == null) return;
if (Gray.isPaused(this)) {
t.setState(Tile.STATE_ACTIVE);
t.setSubtitle("until " + DateFormat.getTimeInstance(DateFormat.SHORT)
.format(new Date(Gray.pausedUntil(this))));
} else {
t.setState(Tile.STATE_INACTIVE);
t.setSubtitle(Gray.label(Gray.tileSeconds(this)));
}
t.updateTile();
}
@Override
public void onClick() {
if (!Gray.canWrite(this)) {
startActivityAndCollapse(Gray.openApp(this));
return;
}
if (Gray.isPaused(this)) Gray.resume(this);
else Gray.pause(this, Gray.tileSeconds(this));
onStartListening();
}
}

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package com.lpw.graypause;
import android.Manifest;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.NotificationManager;
import android.content.ActivityNotFoundException;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Typeface;
import android.graphics.drawable.GradientDrawable;
import android.graphics.Insets;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.provider.Settings;
import android.text.format.DateUtils;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.WindowInsets;
import android.widget.Button;
import android.widget.GridLayout;
import android.widget.LinearLayout;
import android.widget.NumberPicker;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
import android.content.pm.ResolveInfo;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
public class MainActivity extends Activity {
private static final String GRANT_CMD =
"adb shell pm grant com.lpw.graypause android.permission.WRITE_SECURE_SETTINGS";
private final Handler handler = new Handler(Looper.getMainLooper());
private final Runnable ticker = new Runnable() {
@Override public void run() {
refresh();
handler.postDelayed(this, 1000);
}
};
private TextView status;
private View secureSection;
private View notifSection;
private Button shizukuButton;
private TextView colorInfo;
private Button watchButton;
private Button appsButton;
private GridLayout durations;
private Button resumeButton;
private Button toggleButton;
@Override
protected void onCreate(Bundle saved) {
super.onCreate(saved);
requestPermissions(new String[]{Manifest.permission.POST_NOTIFICATIONS}, 0);
Shortcuts.publish(this);
LinearLayout root = new LinearLayout(this);
root.setOrientation(LinearLayout.VERTICAL);
int pad = dp(20);
root.setPadding(pad, pad, pad, pad);
status = new TextView(this);
status.setTextSize(TypedValue.COMPLEX_UNIT_SP, 22);
status.setGravity(Gravity.CENTER);
status.setPadding(0, dp(16), 0, dp(24));
root.addView(status);
LinearLayout secure = section(root, "Grayscale permission missing",
"GrayPause needs \"Write secure settings\" to switch grayscale. Android has no "
+ "switch for it in Settings, but it only has to be granted once.\n\n"
+ "Easiest: with the free Shizuku app running, tap the button below.\n"
+ "Or, from adb:\n" + GRANT_CMD);
shizukuButton = action(secure, "", v -> onShizukuButton());
action(secure, "Copy adb command", v -> {
getSystemService(ClipboardManager.class)
.setPrimaryClip(ClipData.newPlainText("adb", GRANT_CMD));
Toast.makeText(this, "Command copied", Toast.LENGTH_SHORT).show();
});
secureSection = secure;
LinearLayout notif = section(root, "Notifications are off",
"Without them you won't see the countdown, or the \"Grayscale now\" and "
+ "\"+5 min\" buttons, during a color break. Timers still work.");
action(notif, "Open notification settings", v -> open(
new Intent(Settings.ACTION_APP_NOTIFICATION_SETTINGS)
.putExtra(Settings.EXTRA_APP_PACKAGE, getPackageName())));
notifSection = notif;
TextView label = new TextView(this);
label.setText("Show colors for… (long-press a timer to delete it)");
label.setPadding(dp(6), 0, dp(6), dp(8));
root.addView(label);
durations = new GridLayout(this);
durations.setColumnCount(3);
root.addView(durations);
resumeButton = new Button(this);
resumeButton.setText("Grayscale now");
resumeButton.setOnClickListener(v -> {
Gray.resume(this);
refresh();
});
root.addView(resumeButton, fullWidth());
toggleButton = new Button(this);
toggleButton.setOnClickListener(v -> {
Gray.setGray(this, !Gray.isGray(this));
Gray.refreshTile(this);
refresh();
});
root.addView(toggleButton, fullWidth());
TextView colorTitle = new TextView(this);
colorTitle.setText("Color apps");
colorTitle.setTextSize(TypedValue.COMPLEX_UNIT_SP, 18);
colorTitle.setTypeface(Typeface.DEFAULT_BOLD);
colorTitle.setPadding(dp(6), dp(36), dp(6), 0);
root.addView(colorTitle);
colorInfo = new TextView(this);
colorInfo.setPadding(dp(6), dp(6), dp(6), 0);
root.addView(colorInfo);
watchButton = new Button(this);
watchButton.setText("Turn on app watcher");
watchButton.setOnClickListener(v -> {
if (!ColorApps.enableWatch(this)) {
open(new Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS));
}
handler.postDelayed(this::refresh, 500);
});
root.addView(watchButton, fullWidth());
appsButton = new Button(this);
appsButton.setOnClickListener(v -> pickColorApps());
root.addView(appsButton, fullWidth());
TextView hint = new TextView(this);
hint.setText("Tips: long-press the app icon for quick timers. "
+ "The \"Color break\" Quick Settings tile starts a break of the last length "
+ "you used; tap it again to end the break early.");
hint.setAlpha(0.7f);
hint.setPadding(dp(6), dp(32), dp(6), 0);
root.addView(hint);
ScrollView scroll = new ScrollView(this);
scroll.addView(root);
// targetSdk 35+ is edge-to-edge: keep content clear of the status and navigation bars.
scroll.setOnApplyWindowInsetsListener((v, insets) -> {
Insets i = insets.getInsets(
WindowInsets.Type.systemBars() | WindowInsets.Type.displayCutout());
v.setPadding(i.left, i.top, i.right, i.bottom);
return WindowInsets.CONSUMED;
});
setContentView(scroll);
buildDurations();
}
private void buildDurations() {
durations.removeAllViews();
for (int secs : Gray.timers(this)) {
Button b = gridButton(Gray.label(secs));
b.setOnClickListener(v -> {
Gray.pause(this, secs);
refresh();
});
b.setOnLongClickListener(v -> {
confirmDelete(secs);
return true;
});
durations.addView(b);
}
Button add = gridButton("+ Add");
add.setOnClickListener(v -> showCustomDialog());
durations.addView(add);
refresh();
}
private void confirmDelete(int secs) {
new AlertDialog.Builder(this)
.setMessage("Delete the " + Gray.label(secs) + " timer?")
.setPositiveButton("Delete", (d, w) -> {
List<Integer> list = Gray.timers(this);
list.remove(Integer.valueOf(secs));
Gray.setTimers(this, list);
buildDurations();
})
.setNegativeButton("Cancel", null)
.show();
}
private void showCustomDialog() {
LinearLayout row = new LinearLayout(this);
row.setGravity(Gravity.CENTER);
row.setPadding(0, dp(16), 0, 0);
NumberPicker h = picker(row, 23, "h");
NumberPicker m = picker(row, 59, "min");
NumberPicker s = picker(row, 59, "s");
m.setValue(5);
AlertDialog dialog = new AlertDialog.Builder(this)
.setTitle("Custom timer")
.setView(row)
.setPositiveButton("Save", null)
.setNeutralButton("Start once", null)
.setNegativeButton("Cancel", null)
.create();
dialog.setOnShowListener(d -> {
dialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(v -> {
int secs = total(h, m, s);
if (secs == 0) return;
List<Integer> list = Gray.timers(this);
if (!list.contains(secs)) list.add(secs);
Gray.setTimers(this, list);
buildDurations();
dialog.dismiss();
});
dialog.getButton(AlertDialog.BUTTON_NEUTRAL).setOnClickListener(v -> {
int secs = total(h, m, s);
if (secs == 0) return;
if (!Gray.canWrite(this)) {
Toast.makeText(this, "Finish the one-time setup first", Toast.LENGTH_SHORT).show();
return;
}
Gray.pause(this, secs);
refresh();
dialog.dismiss();
});
});
dialog.show();
}
private void pickColorApps() {
PackageManager pm = getPackageManager();
Intent launcher = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER);
TreeMap<String, String> byLabel = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
for (ResolveInfo r : pm.queryIntentActivities(launcher, 0)) {
String pkg = r.activityInfo.packageName;
if (pkg.equals(getPackageName())) continue;
byLabel.put(r.loadLabel(pm) + "\u0000" + pkg, pkg);
}
Set<String> chosen = ColorApps.apps(this);
// Chosen apps first, then everything else alphabetically.
List<String> pkgs = new ArrayList<>();
List<String> labels = new ArrayList<>();
for (int pass = 0; pass < 2; pass++) {
for (Map.Entry<String, String> e : byLabel.entrySet()) {
if (chosen.contains(e.getValue()) == (pass == 0)) {
pkgs.add(e.getValue());
labels.add(e.getKey().substring(0, e.getKey().indexOf('\u0000')));
}
}
}
boolean[] checked = new boolean[pkgs.size()];
for (int i = 0; i < checked.length; i++) checked[i] = chosen.contains(pkgs.get(i));
new AlertDialog.Builder(this)
.setTitle("Always in color")
.setMultiChoiceItems(labels.toArray(new String[0]), checked,
(d, which, on) -> checked[which] = on)
.setPositiveButton("Save", (d, w) -> {
Set<String> out = new HashSet<>();
for (int i = 0; i < checked.length; i++) if (checked[i]) out.add(pkgs.get(i));
ColorApps.setApps(this, out);
refresh();
})
.setNegativeButton("Cancel", null)
.show();
}
private static int total(NumberPicker h, NumberPicker m, NumberPicker s) {
return h.getValue() * 3600 + m.getValue() * 60 + s.getValue();
}
private NumberPicker picker(LinearLayout row, int max, String unit) {
NumberPicker p = new NumberPicker(this);
p.setMinValue(0);
p.setMaxValue(max);
row.addView(p);
TextView t = new TextView(this);
t.setText(unit);
t.setPadding(dp(4), 0, dp(16), 0);
row.addView(t);
return p;
}
@Override
protected void onResume() {
super.onResume();
handler.post(ticker);
}
@Override
protected void onPause() {
super.onPause();
handler.removeCallbacks(ticker);
}
private void refresh() {
if (status == null) return;
boolean ok = Gray.canWrite(this);
boolean paused = Gray.isPaused(this);
secureSection.setVisibility(ok ? View.GONE : View.VISIBLE);
if (!ok) shizukuButton.setText(shizukuLabel(ShizukuGrant.state(this)));
boolean notifOk = checkSelfPermission(Manifest.permission.POST_NOTIFICATIONS)
== PackageManager.PERMISSION_GRANTED
&& getSystemService(NotificationManager.class).areNotificationsEnabled();
notifSection.setVisibility(notifOk ? View.GONE : View.VISIBLE);
for (int i = 0; i < durations.getChildCount() - 1; i++) {
durations.getChildAt(i).setEnabled(ok);
}
resumeButton.setVisibility(paused ? View.VISIBLE : View.GONE);
toggleButton.setVisibility(ok && !paused ? View.VISIBLE : View.GONE);
boolean watching = ColorApps.watchEnabled(this);
int n = ColorApps.apps(this).size();
watchButton.setVisibility(watching ? View.GONE : View.VISIBLE);
appsButton.setText(n == 0 ? "Choose color apps" : "Color apps (" + n + ")");
colorInfo.setText(watching
? "Grayscale switches off while one of these apps is open, and back on "
+ "when you leave it."
: "Keep chosen apps (gallery, camera…) in color. Needs the GrayPause app "
+ "watcher, an accessibility service that only sees which app is open.");
if (paused) {
long left = Math.max(0, Gray.pausedUntil(this) - System.currentTimeMillis());
status.setText("Colors on\ngrayscale returns in "
+ DateUtils.formatElapsedTime((left + 999) / 1000));
} else {
boolean gray = Gray.isGray(this);
status.setText(gray ? "Grayscale is on" : "Grayscale is off");
toggleButton.setText(gray ? "Turn grayscale off (no timer)" : "Turn grayscale on");
}
}
/** A warning card with a title and explanation; add buttons with {@link #action}. */
private LinearLayout section(LinearLayout parent, String title, String body) {
LinearLayout box = new LinearLayout(this);
box.setOrientation(LinearLayout.VERTICAL);
box.setPadding(dp(16), dp(16), dp(16), dp(10));
GradientDrawable bg = new GradientDrawable();
bg.setCornerRadius(dp(12));
bg.setStroke(dp(2), 0xFFFF9800);
box.setBackground(bg);
TextView t = new TextView(this);
t.setText(title);
t.setTextSize(TypedValue.COMPLEX_UNIT_SP, 18);
t.setTypeface(Typeface.DEFAULT_BOLD);
box.addView(t);
TextView b = new TextView(this);
b.setText(body);
b.setTextIsSelectable(true);
b.setPadding(0, dp(8), 0, dp(8));
box.addView(b);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(dp(6), 0, dp(6), dp(20));
parent.addView(box, lp);
return box;
}
private Button action(LinearLayout box, String text, View.OnClickListener l) {
Button btn = new Button(this);
btn.setText(text);
btn.setOnClickListener(l);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(0, dp(6), 0, dp(6));
box.addView(btn, lp);
return btn;
}
private void onShizukuButton() {
switch (ShizukuGrant.state(this)) {
case NOT_INSTALLED:
open(new Intent(Intent.ACTION_VIEW, Uri.parse(ShizukuGrant.DOWNLOAD_URL)));
break;
case NOT_RUNNING:
Intent launch = getPackageManager().getLaunchIntentForPackage(ShizukuGrant.PACKAGE);
if (launch != null) open(launch);
break;
default:
shizukuButton.setEnabled(false);
ShizukuGrant.grant(this, (ok, msg) -> {
shizukuButton.setEnabled(true);
Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
refresh();
});
}
}
private static String shizukuLabel(ShizukuGrant.State s) {
switch (s) {
case NOT_INSTALLED: return "Get Shizuku";
case NOT_RUNNING: return "Open Shizuku and start it";
default: return "Grant with Shizuku";
}
}
private void open(Intent intent) {
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
startActivity(new Intent(Settings.ACTION_SETTINGS));
}
}
private Button gridButton(String text) {
Button b = new Button(this);
b.setText(text);
b.setMinHeight(dp(56));
b.setSingleLine(true);
GridLayout.LayoutParams lp = new GridLayout.LayoutParams(
GridLayout.spec(GridLayout.UNDEFINED, 1f),
GridLayout.spec(GridLayout.UNDEFINED, 1f));
lp.width = 0;
lp.setMargins(dp(6), dp(6), dp(6), dp(6));
b.setLayoutParams(lp);
return b;
}
private LinearLayout.LayoutParams fullWidth() {
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(dp(6), dp(20), dp(6), 0);
return lp;
}
private int dp(int v) {
return Math.round(v * getResources().getDisplayMetrics().density);
}
}

16
app/src/main/java/com/lpw/graypause/RestoreReceiver.java Normal file
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package com.lpw.graypause;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class RestoreReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context c, Intent intent) {
if (Gray.ACTION_EXTEND.equals(intent.getAction())) {
Gray.extend(c, 300);
} else {
Gray.resume(c);
}
}
}

81
app/src/main/java/com/lpw/graypause/ShizukuGrant.java Normal file
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package com.lpw.graypause;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Handler;
import android.os.Looper;
import java.lang.reflect.Method;
import rikka.shizuku.Shizuku;
/**
* Grants WRITE_SECURE_SETTINGS once through Shizuku, which runs as the adb shell user.
* The grant persists, so Shizuku is not needed afterwards.
*/
final class ShizukuGrant {
static final String PACKAGE = "moe.shizuku.privileged.api";
static final String DOWNLOAD_URL = "https://shizuku.rikka.app/download/";
private static final int REQUEST_CODE = 42;
enum State { NOT_INSTALLED, NOT_RUNNING, NEEDS_PERMISSION, READY }
interface Callback { void done(boolean ok, String message); }
private ShizukuGrant() {}
static State state(Context c) {
try {
c.getPackageManager().getPackageInfo(PACKAGE, 0);
} catch (PackageManager.NameNotFoundException e) {
return State.NOT_INSTALLED;
}
if (!Shizuku.pingBinder() || Shizuku.isPreV11()) return State.NOT_RUNNING;
return Shizuku.checkSelfPermission() == PackageManager.PERMISSION_GRANTED
? State.READY : State.NEEDS_PERMISSION;
}
/** Asks Shizuku for access if needed, then runs the grant. The callback runs on the main thread. */
static void grant(Context c, Callback cb) {
State s = state(c);
if (s == State.READY) {
runGrant(c, cb);
} else if (s == State.NEEDS_PERMISSION) {
Shizuku.addRequestPermissionResultListener(new Shizuku.OnRequestPermissionResultListener() {
@Override public void onRequestPermissionResult(int code, int result) {
if (code != REQUEST_CODE) return;
Shizuku.removeRequestPermissionResultListener(this);
if (result == PackageManager.PERMISSION_GRANTED) runGrant(c, cb);
else cb.done(false, "Shizuku access was denied");
}
});
Shizuku.requestPermission(REQUEST_CODE);
} else {
cb.done(false, "Shizuku is not running");
}
}
private static void runGrant(Context c, Callback cb) {
Handler main = new Handler(Looper.getMainLooper());
new Thread(() -> {
String error = null;
try {
// Shizuku 13 made newProcess private in favour of UserService; for a one-off
// shell command it is still by far the simplest route.
Method m = Shizuku.class.getDeclaredMethod(
"newProcess", String[].class, String[].class, String.class);
m.setAccessible(true);
Process p = (Process) m.invoke(null, new String[]{"pm", "grant",
c.getPackageName(), Manifest.permission.WRITE_SECURE_SETTINGS}, null, null);
String err = new String(p.getErrorStream().readAllBytes()).trim();
if (p.waitFor() != 0) error = err.isEmpty() ? "pm grant failed" : err;
} catch (Exception e) {
Throwable t = e.getCause() != null ? e.getCause() : e;
error = t.toString();
}
boolean ok = error == null && Gray.canWrite(c);
String msg = ok ? "Permission granted, Shizuku is no longer needed"
: (error != null ? error : "Grant did not take effect");
main.post(() -> cb.done(ok, msg));
}).start();
}
}

23
app/src/main/java/com/lpw/graypause/ShortcutActivity.java Normal file
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package com.lpw.graypause;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;
public class ShortcutActivity extends Activity {
static final String EXTRA_SECONDS = "seconds";
@Override
protected void onCreate(Bundle saved) {
super.onCreate(saved);
int secs = getIntent().getIntExtra(EXTRA_SECONDS, 0);
if (!Gray.canWrite(this) || secs <= 0) {
startActivity(new Intent(this, MainActivity.class));
} else {
Gray.pause(this, secs);
Toast.makeText(this, "Colors for " + Gray.label(secs), Toast.LENGTH_SHORT).show();
}
finish();
}
}

36
app/src/main/java/com/lpw/graypause/Shortcuts.java Normal file
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package com.lpw.graypause;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ShortcutInfo;
import android.content.pm.ShortcutManager;
import android.graphics.drawable.Icon;
import java.util.ArrayList;
import java.util.List;
/** Long-press launcher shortcuts: one per timer, shortest first. */
final class Shortcuts {
private Shortcuts() {}
static void publish(Context c) {
ShortcutManager sm = c.getSystemService(ShortcutManager.class);
List<Integer> timers = Gray.timers(c);
int max = Math.min(sm.getMaxShortcutCountPerActivity(), timers.size());
List<ShortcutInfo> list = new ArrayList<>();
for (int i = 0; i < max; i++) {
int secs = timers.get(i);
Intent intent = new Intent(c, ShortcutActivity.class)
.setAction(Intent.ACTION_VIEW)
.putExtra(ShortcutActivity.EXTRA_SECONDS, secs);
String label = "Colors " + Gray.label(secs);
list.add(new ShortcutInfo.Builder(c, "t" + secs)
.setShortLabel(label)
.setLongLabel(label)
.setIcon(Icon.createWithResource(c, R.drawable.ic_shortcut))
.setIntent(intent)
.setRank(i)
.build());
}
sm.setDynamicShortcuts(list);
}
}

7
app/src/main/res/drawable/ic_launcher.xml Normal file
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<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="48dp" android:height="48dp"
android:viewportWidth="48" android:viewportHeight="48">
<path android:fillColor="#FF202020" android:pathData="M24,0A24,24 0 1,0 24,48A24,24 0 1,0 24,0Z" />
<path android:fillColor="#FFE0E0E0" android:pathData="M24,8A16,16 0 0,0 24,40Z" />
<path android:fillColor="#FFFF9800" android:pathData="M24,8A16,16 0 0,1 24,40Z" />
</vector>

6
app/src/main/res/drawable/ic_shortcut.xml Normal file
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<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp" android:height="24dp"
android:viewportWidth="24" android:viewportHeight="24">
<path android:fillColor="#FFFF9800"
android:pathData="M12,2A10,10 0 1,0 12,22A10,10 0 1,0 12,2ZM12,4A8,8 0 1,1 12,20A8,8 0 1,1 12,4ZM11,7L11,13L16,16L16.8,14.7L12.5,12.2L12.5,7Z" />
</vector>

6
app/src/main/res/drawable/ic_tile.xml Normal file
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@ -0,0 +1,6 @@
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp" android:height="24dp"
android:viewportWidth="24" android:viewportHeight="24">
<path android:fillColor="#FFFFFFFF"
android:pathData="M12,2A10,10 0 1,0 12,22A10,10 0 1,0 12,2ZM12,4L12,20A8,8 0 0,1 12,4Z" />
</vector>

6
app/src/main/res/values/strings.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">GrayPause</string>
<string name="tile_label">Color break</string>
<string name="a11y_description">Watches which app is in front so grayscale can be switched off while you use the apps you chose in GrayPause (for example your gallery or camera). It reads only the app name, never screen content.</string>
</resources>

7
app/src/main/res/values/styles.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="AppTheme" parent="@android:style/Theme.DeviceDefault.DayNight">
<item name="android:windowActionBar">false</item>
<item name="android:windowNoTitle">true</item>
</style>
</resources>

7
app/src/main/res/xml/accessibility_config.xml Normal file
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@ -0,0 +1,7 @@
<?xml version="1.0" encoding="utf-8"?>
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
android:accessibilityEventTypes="typeWindowStateChanged"
android:accessibilityFeedbackType="feedbackGeneric"
android:notificationTimeout="200"
android:canRetrieveWindowContent="false"
android:description="@string/a11y_description" />

3
build.gradle Normal file
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plugins {
id "com.android.application" version "8.6.1" apply false
}

59
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#!/data/data/com.termux/files/usr/bin/bash
# Gradle-free debug build for Termux on the phone itself: native aapt2/javac/apksigner,
# plus d8 and android.jar borrowed from the Android SDK in the proot Ubuntu container.
# Release/F-Droid builds use Gradle instead (./gradlew assembleRelease).
set -euo pipefail
cd "$(dirname "$0")"
SDK=${ANDROID_SDK:-$PREFIX/var/lib/proot-distro/containers/ubuntu/rootfs/root/android-sdk}
ANDROID_JAR=$SDK/platforms/android-36/android.jar
D8_JAR=$SDK/build-tools/36.1.0/lib/d8.jar
KEYSTORE=$HOME/.android/debug.keystore
MAIN=app/src/main
OUT=build/termux
# Single source of truth for ids and versions is app/build.gradle.
gradle_value() { sed -n "s/^ *$1 *\"\{0,1\}\([^\"]*\)\"\{0,1\} *$/\1/p" app/build.gradle | head -1; }
APP_ID=$(gradle_value applicationId)
VERSION_CODE=$(gradle_value versionCode)
VERSION_NAME=$(gradle_value versionName)
MIN_SDK=$(gradle_value minSdk)
TARGET_SDK=$(gradle_value targetSdk)
SHIZUKU=$(sed -n 's/.*def shizuku = "\(.*\)"/\1/p' app/build.gradle)
rm -rf "$OUT" && mkdir -p "$OUT"/{gen,classes,dex,libs}
# Shizuku client: classes.jar out of each AAR from Maven Central, cached between builds.
CACHE=build/maven-cache/$SHIZUKU && mkdir -p "$CACHE"
for a in api provider aidl shared; do
jar=$CACHE/$a.jar
if [ ! -f "$jar" ]; then
curl -sfL -o "$CACHE/$a.aar" \
"https://repo1.maven.org/maven2/dev/rikka/shizuku/$a/$SHIZUKU/$a-$SHIZUKU.aar"
unzip -p "$CACHE/$a.aar" classes.jar > "$jar"
fi
cp "$jar" "$OUT/libs/"
done
# Gradle injects the package from `namespace`; aapt2 needs it in the manifest itself.
sed "s|<manifest |<manifest package=\"$APP_ID\" |" $MAIN/AndroidManifest.xml > $OUT/AndroidManifest.xml
aapt2 compile --dir $MAIN/res -o $OUT/res.zip
aapt2 link -I "$ANDROID_JAR" --manifest $OUT/AndroidManifest.xml \
--min-sdk-version "$MIN_SDK" --target-sdk-version "$TARGET_SDK" \
--version-code "$VERSION_CODE" --version-name "$VERSION_NAME" \
--java $OUT/gen -o $OUT/unsigned.apk $OUT/res.zip
LIBS=$(ls $OUT/libs/*.jar | paste -sd:)
javac -source 17 -target 17 -nowarn -classpath "$ANDROID_JAR:$LIBS" -d $OUT/classes \
$(find $MAIN/java $OUT/gen -name '*.java')
java -cp "$D8_JAR" com.android.tools.r8.D8 --release --min-api "$MIN_SDK" \
--lib "$ANDROID_JAR" --output $OUT/dex $(find $OUT/classes -name '*.class') $OUT/libs/*.jar
javac -d $OUT tools/ZipAlign.java
java -cp $OUT ZipAlign $OUT/unsigned.apk $OUT/aligned.apk $OUT/dex/classes.dex
apksigner sign --ks "$KEYSTORE" --ks-pass pass:android --key-pass pass:android \
--out GrayPause.apk $OUT/aligned.apk
apksigner verify GrayPause.apk
echo "Built $(pwd)/GrayPause.apk ($APP_ID $VERSION_NAME)"

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fastlane/metadata/android/en-US/changelogs/5.txt Normal file
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First public release: color-break timers, custom timers, Quick Settings tile, launcher shortcuts, color apps, Shizuku-assisted setup.

21
fastlane/metadata/android/en-US/full_description.txt Normal file
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<p>Grayscale makes a phone much less tempting to pick up. The hard part is the moment you need color for a minute — a photo, a map, a chart — and then forget to turn grayscale back on.</p>
<p>GrayPause gives you <b>color breaks</b>: grayscale switches off for the time you choose and comes back on by itself.</p>
<ul>
<li><b>One-tap timers</b> — 1, 5, 10, 15, 30 min by default. Add your own with hours, minutes and seconds; delete any of them.</li>
<li><b>Quick Settings tile</b> — starts a break of the last length you used; tap again to end it early.</li>
<li><b>App shortcuts</b> — long-press the launcher icon to start a timer without opening the app.</li>
<li><b>Countdown notification</b> with "Grayscale now" and "+5 min" buttons.</li>
<li><b>Color apps</b> (optional) — pick apps such as your gallery or camera that are always shown in color. Grayscale switches off while one of them is open and back on when you leave it.</li>
<li>Survives reboots: a running break is resumed, or grayscale restored if the time is up.</li>
</ul>
<p><b>One-time setup.</b> Android only lets system apps switch grayscale, so GrayPause needs the <i>WRITE_SECURE_SETTINGS</i> permission. It cannot be granted from Settings, only once, either:</p>
<ul>
<li>with <b>Shizuku</b> running: tap "Grant with Shizuku" in the app, or</li>
<li>over adb: <tt>adb shell pm grant com.lpw.graypause android.permission.WRITE_SECURE_SETTINGS</tt></li>
</ul>
<p>The permission is kept across reboots and updates; Shizuku is not needed afterwards.</p>
<p><b>Accessibility service.</b> The optional "Color apps" feature uses an accessibility service only to learn which app is in the foreground. It does not read screen content, and nothing leaves your device: GrayPause has no internet permission.</p>

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Keep your phone in grayscale, take short color breaks that end by themselves

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fastlane/metadata/android/en-US/title.txt Normal file
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GrayPause

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fdroid/com.lpw.graypause.yml Normal file
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# Draft for https://gitlab.com/fdroid/fdroiddata (metadata/com.lpw.graypause.yml).
Categories:
- System
- Theming
License: GPL-3.0-or-later
AuthorName: metaheavens
SourceCode: https://metaheavens.de/forgejo/metaheavens/graypause
IssueTracker: https://metaheavens.de/forgejo/metaheavens/graypause/issues
AutoName: GrayPause
RepoType: git
Repo: https://metaheavens.de/forgejo/metaheavens/graypause.git
Builds:
- versionName: '1.4'
versionCode: 5
commit: v1.4
subdir: app
gradle:
- yes
AutoUpdateMode: Version
UpdateCheckMode: Tags
CurrentVersion: '1.4'
CurrentVersionCode: 5

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gradle.properties Normal file
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org.gradle.jvmargs=-Xmx1536m -Dfile.encoding=UTF-8
android.useAndroidX=true
android.nonTransitiveRClass=true
# AGP 8.6 has not caught up with API 36 yet; it builds fine, this only silences the warning.
android.suppressUnsupportedCompileSdk=36

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gradle/wrapper/gradle-wrapper.jar vendored Normal file
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gradle/wrapper/gradle-wrapper.properties vendored Normal file
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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
networkTimeout=10000
validateDistributionUrl=true
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

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gradlew vendored Executable file
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#!/bin/sh
#
# Copyright © 2015-2021 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
#
##############################################################################
#
# Gradle start up script for POSIX generated by Gradle.
#
# Important for running:
#
# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
# noncompliant, but you have some other compliant shell such as ksh or
# bash, then to run this script, type that shell name before the whole
# command line, like:
#
# ksh Gradle
#
# Busybox and similar reduced shells will NOT work, because this script
# requires all of these POSIX shell features:
# * functions;
# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
# * compound commands having a testable exit status, especially «case»;
# * various built-in commands including «command», «set», and «ulimit».
#
# Important for patching:
#
# (2) This script targets any POSIX shell, so it avoids extensions provided
# by Bash, Ksh, etc; in particular arrays are avoided.
#
# The "traditional" practice of packing multiple parameters into a
# space-separated string is a well documented source of bugs and security
# problems, so this is (mostly) avoided, by progressively accumulating
# options in "$@", and eventually passing that to Java.
#
# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
# see the in-line comments for details.
#
# There are tweaks for specific operating systems such as AIX, CygWin,
# Darwin, MinGW, and NonStop.
#
# (3) This script is generated from the Groovy template
# https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
# within the Gradle project.
#
# You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
app_path=$0
# Need this for daisy-chained symlinks.
while
APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
[ -h "$app_path" ]
do
ls=$( ls -ld "$app_path" )
link=${ls#*' -> '}
case $link in #(
/*) app_path=$link ;; #(
*) app_path=$APP_HOME$link ;;
esac
done
# This is normally unused
# shellcheck disable=SC2034
APP_BASE_NAME=${0##*/}
# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
' "$PWD" ) || exit
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum
warn () {
echo "$*"
} >&2
die () {
echo
echo "$*"
echo
exit 1
} >&2
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in #(
CYGWIN* ) cygwin=true ;; #(
Darwin* ) darwin=true ;; #(
MSYS* | MINGW* ) msys=true ;; #(
NONSTOP* ) nonstop=true ;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD=$JAVA_HOME/jre/sh/java
else
JAVACMD=$JAVA_HOME/bin/java
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD=java
if ! command -v java >/dev/null 2>&1
then
die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
fi
# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
case $MAX_FD in #(
max*)
# In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
MAX_FD=$( ulimit -H -n ) ||
warn "Could not query maximum file descriptor limit"
esac
case $MAX_FD in #(
'' | soft) :;; #(
*)
# In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
ulimit -n "$MAX_FD" ||
warn "Could not set maximum file descriptor limit to $MAX_FD"
esac
fi
# Collect all arguments for the java command, stacking in reverse order:
# * args from the command line
# * the main class name
# * -classpath
# * -D...appname settings
# * --module-path (only if needed)
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
JAVACMD=$( cygpath --unix "$JAVACMD" )
# Now convert the arguments - kludge to limit ourselves to /bin/sh
for arg do
if
case $arg in #(
-*) false ;; # don't mess with options #(
/?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
[ -e "$t" ] ;; #(
*) false ;;
esac
then
arg=$( cygpath --path --ignore --mixed "$arg" )
fi
# Roll the args list around exactly as many times as the number of
# args, so each arg winds up back in the position where it started, but
# possibly modified.
#
# NB: a `for` loop captures its iteration list before it begins, so
# changing the positional parameters here affects neither the number of
# iterations, nor the values presented in `arg`.
shift # remove old arg
set -- "$@" "$arg" # push replacement arg
done
fi
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Collect all arguments for the java command:
# * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
# and any embedded shellness will be escaped.
# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
# treated as '${Hostname}' itself on the command line.
set -- \
"-Dorg.gradle.appname=$APP_BASE_NAME" \
-classpath "$CLASSPATH" \
org.gradle.wrapper.GradleWrapperMain \
"$@"
# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
die "xargs is not available"
fi
# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
# set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#
eval "set -- $(
printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
xargs -n1 |
sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
tr '\n' ' '
)" '"$@"'
exec "$JAVACMD" "$@"

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gradlew.bat vendored Normal file
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@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@rem SPDX-License-Identifier: Apache-2.0
@rem
@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
@rem This is normally unused
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

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settings.gradle Normal file
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pluginManagement {
repositories {
google()
mavenCentral()
gradlePluginPortal()
}
}
dependencyResolutionManagement {
repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
repositories {
google()
mavenCentral()
}
}
rootProject.name = "GrayPause"
include ":app"

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tools/ZipAlign.java Normal file
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import java.io.*;
import java.util.*;
import java.util.zip.*;
/**
* Minimal zipalign: copies a zip, padding STORED entries so their data is 4-byte aligned,
* and appends any extra files given after the output path (compressed, at the zip root).
*/
public class ZipAlign {
public static void main(String[] a) throws IOException {
try (ZipFile in = new ZipFile(a[0]);
CountingOut cnt = new CountingOut(new BufferedOutputStream(new FileOutputStream(a[1])));
ZipOutputStream out = new ZipOutputStream(cnt)) {
for (ZipEntry e : Collections.list(in.entries())) {
ZipEntry n = new ZipEntry(e.getName());
n.setMethod(e.getMethod());
n.setTime(946684800000L); // 2000-01-01, inside the DOS date range (no extra timestamp field)
if (e.getMethod() == ZipEntry.STORED) {
n.setSize(e.getSize());
n.setCompressedSize(e.getSize());
n.setCrc(e.getCrc());
out.flush();
long dataStart = cnt.count + 30 + n.getName().getBytes("UTF-8").length;
int pad = (int) ((4 - dataStart % 4) % 4);
if (pad > 0) n.setExtra(padExtra(pad));
}
out.putNextEntry(n);
in.getInputStream(e).transferTo(out);
out.closeEntry();
}
for (int i = 2; i < a.length; i++) {
File f = new File(a[i]);
ZipEntry n = new ZipEntry(f.getName());
n.setTime(946684800000L);
out.putNextEntry(n);
try (InputStream fin = new FileInputStream(f)) { fin.transferTo(out); }
out.closeEntry();
}
}
}
// An extra field needs a 4-byte header, so use one field of pad+4 bytes (Android's 0xD935 alignment tag).
static byte[] padExtra(int pad) {
byte[] x = new byte[pad + 4];
x[0] = 0x35; x[1] = (byte) 0xD9; x[2] = (byte) pad;
return x;
}
static class CountingOut extends FilterOutputStream {
long count;
CountingOut(OutputStream o) { super(o); }
@Override public void write(int b) throws IOException { out.write(b); count++; }
@Override public void write(byte[] b, int off, int len) throws IOException { out.write(b, off, len); count += len; }
}
}