initial release - nightd v1.1

.gitignore

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+# Gradle
+.gradle/
+build/
+*.class
+
+# Android
+local.properties
+*.apk
+*.ap_
+*.dex
+
+# IDE
+.idea/
+*.iml
+.vscode/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Build artifacts
+obj/
+*.o
+*.so

LICENSE

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+MIT License
+
+Copyright (c) 2024 sudoxnym
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+<p align="center">
+  <img src="assets/banner.png" alt="nightd banner" width="400"/>
+</p>
+
+<h1 align="center">nightd</h1>
+<p align="center">
+  <em>screen dimmer for android tv</em><br>
+  <strong>keep your media playing while the screen goes dark</strong>
+</p>
+
+<p align="center">
+  <a href="https://github.com/sudoxnym/nightd/releases/latest"><img src="https://img.shields.io/github/v/release/sudoxnym/nightd?style=flat-square&color=00d4ff" alt="latest release"/></a>
+  <a href="https://github.com/sudoxnym/nightd/blob/main/LICENSE"><img src="https://img.shields.io/badge/license-MIT-ff69b4?style=flat-square" alt="license"/></a>
+  <img src="https://img.shields.io/badge/android-7.0+-7B68EE?style=flat-square" alt="android 7.0+"/>
+</p>
+
+---
+
+## what is this?
+
+nightd is a tiny android tv app that blacks out your screen while keeping your media playing. perfect for:
+
+- **falling asleep to music/podcasts** - screen goes dark, audio keeps playing
+- **saving power on oled displays** - no burn-in, no wasted pixels
+- **background audio** - cast audio without lighting up your room
+
+## modes
+
+| mode | what it does |
+|------|-------------|
+| **dim** | single overlay layer (~40% darker) |
+| **black** | 5 stacked layers = pitch black (android limits overlay opacity to 80%, so we stack 'em) |
+
+cycle order: `off → dim → black → off`
+
+## installation
+
+1. download the latest [nightd.apk](https://github.com/sudoxnym/nightd/releases/latest)
+2. sideload via adb: `adb install nightd.apk`
+3. grant "display over other apps" permission when prompted
+
+## usage
+
+### with key mapper (recommended)
+
+use [key mapper](https://github.com/keymapperorg/KeyMapper) to bind nightd to remote buttons:
+
+| action | intent |
+|--------|--------|
+| toggle | `com.sudox.nightd.TOGGLE` |
+| dim mode | `com.sudox.nightd.DIM` |
+| black mode | `com.sudox.nightd.BLACK` |
+| turn off | `com.sudox.nightd.OFF` |
+
+**package:** `com.sudox.nightd`  
+**service:** `com.sudox.nightd.NightdService`
+
+example: bind "zoom in" to toggle, "zoom out" to off.
+
+### with adb
+
+```bash
+# toggle (cycles through off → dim → black → off)
+adb shell am startservice -a com.sudox.nightd.TOGGLE com.sudox.nightd/.NightdService
+
+# specific modes
+adb shell am startservice -a com.sudox.nightd.DIM com.sudox.nightd/.NightdService
+adb shell am startservice -a com.sudox.nightd.BLACK com.sudox.nightd/.NightdService
+adb shell am startservice -a com.sudox.nightd.OFF com.sudox.nightd/.NightdService
+```
+
+## how it works
+
+android limits overlay opacity to 80% per layer. to achieve true black, nightd stacks 5 layers:
+
+```
+0.8 × 0.8 × 0.8 × 0.8 × 0.8 = 0.032 (96.8% blocked)
+```
+
+plus it sets screen brightness to 0 for good measure.
+
+## permissions
+
+- **SYSTEM_ALERT_WINDOW** - required to draw overlay
+- **FOREGROUND_SERVICE** - keeps the overlay running
+- **WRITE_SETTINGS** - adjusts screen brightness (optional, gracefully fails)
+
+## building from source
+
+```bash
+# clone
+git clone https://github.com/sudoxnym/nightd.git
+cd nightd
+
+# build (requires android ndk)
+./gradlew assembleRelease
+
+# or use the aapt/d8/apksigner toolchain directly
+```
+
+## license
+
+MIT - do whatever you want with it.
+
+---
+
+<p align="center">
+  <sub>built by <a href="https://github.com/sudoxnym">sudoxnym</a> for the sleep-deprived</sub>
+</p>

app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    namespace 'com.sudox.nightd'
+    compileSdk 34
+
+    defaultConfig {
+        applicationId "com.sudox.nightd"
+        minSdk 21
+        targetSdk 34
+        versionCode 1
+        versionName "1.0"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+        debug {
+            minifyEnabled false
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.sudox.nightd"
+    android:versionCode="2"
+    android:versionName="1.1">
+
+    <uses-sdk android:minSdkVersion="24" android:targetSdkVersion="35" />
+
+    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
+    <uses-permission android:name="android.permission.WRITE_SETTINGS" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+
+    <uses-feature android:name="android.software.leanback" android:required="false" />
+    <uses-feature android:name="android.hardware.touchscreen" android:required="false" />
+
+    <application
+        android:allowBackup="false"
+        android:icon="@mipmap/ic_launcher"
+        android:label="nightd"
+        android:banner="@drawable/banner"
+        android:theme="@style/NightdTheme">
+
+        <service
+            android:name=".NightdService"
+            android:exported="true"
+            android:foregroundServiceType="specialUse">
+            <property
+                android:name="android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE"
+                android:value="screen_overlay"/>
+            <intent-filter>
+                <action android:name="com.sudox.nightd.TOGGLE" />
+                <action android:name="com.sudox.nightd.ON" />
+                <action android:name="com.sudox.nightd.OFF" />
+                <action android:name="com.sudox.nightd.DIM" />
+                <action android:name="com.sudox.nightd.BLACK" />
+            </intent-filter>
+        </service>
+
+        <activity
+            android:name=".NightdActivity"
+            android:exported="true"
+            android:launchMode="singleTask"
+            android:theme="@android:style/Theme.Translucent.NoTitleBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <receiver
+            android:name=".BootReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
+
+    </application>
+
+</manifest>

app/src/main/java/com/sudox/nightd/BootReceiver.java

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+package com.sudox.nightd;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+public class BootReceiver extends BroadcastReceiver {
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
+            // Service ready to be triggered after boot
+            // Does not auto-start overlay, just ensures service is available
+        }
+    }
+}

app/src/main/java/com/sudox/nightd/NightdActivity.java

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+package com.sudox.nightd;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.provider.Settings;
+
+public class NightdActivity extends Activity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        
+        // Check overlay permission first
+        if (!Settings.canDrawOverlays(this)) {
+            Intent intent = new Intent(
+                Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
+                Uri.parse("package:" + getPackageName())
+            );
+            startActivityForResult(intent, 100);
+        } else {
+            toggleService();
+            finish();
+        }
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if (requestCode == 100 && Settings.canDrawOverlays(this)) {
+            toggleService();
+        }
+        finish();
+    }
+
+    private void toggleService() {
+        Intent intent = new Intent(this, NightdService.class);
+        intent.setAction("com.sudox.nightd.TOGGLE");
+        startForegroundService(intent);
+    }
+}

app/src/main/java/com/sudox/nightd/NightdService.java

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+package com.sudox.nightd;
+
+import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.app.Service;
+import android.content.Intent;
+import android.graphics.PixelFormat;
+import android.os.IBinder;
+import android.provider.Settings;
+import android.view.Gravity;
+import android.view.View;
+import android.view.WindowManager;
+import android.widget.FrameLayout;
+import java.util.ArrayList;
+import java.util.List;
+
+public class NightdService extends Service {
+    private static final String CHANNEL_ID = "nightd_channel";
+    private static final int NOTIFICATION_ID = 1;
+    
+    private WindowManager windowManager;
+    private List<View> overlayViews = new ArrayList<>();
+    private int currentMode = 0; // 0=off, 1=dim, 2=black
+    private int savedBrightness = 128;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
+        createNotificationChannel();
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        String action = intent == null ? null : intent.getAction();
+        
+        if ("com.sudox.nightd.DIM".equals(action)) {
+            setMode(1);
+        } else if ("com.sudox.nightd.BLACK".equals(action)) {
+            setMode(2);
+        } else if ("com.sudox.nightd.OFF".equals(action)) {
+            setMode(0);
+        } else {
+            // Toggle: off -> dim -> black -> off
+            setMode((currentMode + 1) % 3);
+        }
+        
+        return START_STICKY;
+    }
+
+    private void setMode(int mode) {
+        // Clear existing overlays
+        for (View v : overlayViews) {
+            try { windowManager.removeView(v); } catch (Exception e) {}
+        }
+        overlayViews.clear();
+        
+        if (mode == 0) {
+            // Off
+            try {
+                Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, savedBrightness);
+            } catch (Exception e) {}
+            currentMode = 0;
+            stopForeground(true);
+            stopSelf();
+            return;
+        }
+        
+        if (Settings.canDrawOverlays(this) == false) {
+            Intent permIntent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
+            permIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            startActivity(permIntent);
+            return;
+        }
+
+        // Save brightness on first activation
+        if (currentMode == 0) {
+            try {
+                savedBrightness = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
+            } catch (Exception e) {}
+        }
+        
+        try {
+            Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 0);
+        } catch (Exception e) {}
+
+        startForeground(NOTIFICATION_ID, buildNotification(mode));
+
+        int layers = (mode == 1) ? 1 : 5;
+        for (int i = 0; i < layers; i++) {
+            FrameLayout layer = new FrameLayout(this);
+            layer.setBackgroundColor(0xFF000000);
+
+            WindowManager.LayoutParams params = new WindowManager.LayoutParams(
+                WindowManager.LayoutParams.MATCH_PARENT,
+                WindowManager.LayoutParams.MATCH_PARENT,
+                WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
+                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
+                WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE |
+                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN |
+                WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS |
+                WindowManager.LayoutParams.FLAG_FULLSCREEN,
+                PixelFormat.TRANSLUCENT
+            );
+            params.gravity = Gravity.TOP | Gravity.START;
+            params.screenBrightness = 0.0f;
+
+            try {
+                windowManager.addView(layer, params);
+                overlayViews.add(layer);
+            } catch (Exception e) { break; }
+        }
+        currentMode = mode;
+    }
+
+    private void createNotificationChannel() {
+        NotificationChannel channel = new NotificationChannel(
+            CHANNEL_ID, "nightd overlay", NotificationManager.IMPORTANCE_LOW
+        );
+        channel.setDescription("nightd screen overlay service");
+        getSystemService(NotificationManager.class).createNotificationChannel(channel);
+    }
+
+    private Notification buildNotification(int mode) {
+        Intent offIntent = new Intent(this, NightdService.class);
+        offIntent.setAction("com.sudox.nightd.OFF");
+        PendingIntent pendingIntent = PendingIntent.getService(this, 0, offIntent, PendingIntent.FLAG_IMMUTABLE);
+        
+        String modeText = (mode == 1) ? "dim" : "black";
+        return new Notification.Builder(this, CHANNEL_ID)
+            .setContentTitle("nightd: " + modeText)
+            .setContentText("tap to disable")
+            .setSmallIcon(android.R.drawable.ic_menu_view)
+            .setContentIntent(pendingIntent)
+            .setOngoing(true)
+            .build();
+    }
+
+    @Override
+    public IBinder onBind(Intent intent) { return null; }
+
+    @Override
+    public void onDestroy() {
+        setMode(0);
+        super.onDestroy();
+    }
+}

app/src/main/res/values/styles.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="NightdTheme" parent="@android:style/Theme.NoTitleBar.Fullscreen">
+        <item name="android:windowBackground">@android:color/black</item>
+        <item name="android:colorBackground">@android:color/black</item>
+    </style>
+</resources>

build.gradle

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+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:8.2.0'
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}

gradle.properties

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+org.gradle.jvmargs=-Xmx1536m
+android.useAndroidX=false

settings.gradle

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+rootProject.name = "nightd"
+include ':app'