add initial version

2025-05-10 21:41:34 -04:00
commit fb00874218
33 changed files with 897 additions and 0 deletions
--- a/app/src/main/java/us/beckmeyer/autobrightnessdelay/AutoBrightnessDelayService.kt
+++ b/app/src/main/java/us/beckmeyer/autobrightnessdelay/AutoBrightnessDelayService.kt
@@ -0,0 +1,108 @@
+package us.beckmeyer.autobrightnessdelay
+
+import android.app.Service
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.os.IBinder
+import android.provider.Settings
+import androidx.core.app.NotificationChannelCompat
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import kotlin.time.Duration.Companion.milliseconds
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+
+class AutoBrightnessDelayService : Service() {
+  companion object {
+    private const val CHANNEL_ID = "guard_channel"
+    private const val NOTIFICATION_ID = 42
+    private val SCREEN_ON_DELAY = 500.milliseconds
+  }
+
+  private val scope = CoroutineScope(Dispatchers.Main + SupervisorJob())
+  private var pendingJob: Job? = null
+
+  private val screenReceiver =
+    object : BroadcastReceiver() {
+      override fun onReceive(ctx: Context, intent: Intent) {
+        pendingJob?.cancel() // cancel any "mid-flight" task
+        when (intent.action) {
+          Intent.ACTION_SCREEN_OFF -> {
+            disableAutoBrightness()
+          }
+          Intent.ACTION_SCREEN_ON,
+          Intent.ACTION_USER_PRESENT -> {
+            pendingJob =
+              scope.launch {
+                delay(SCREEN_ON_DELAY)
+                enableAutoBrightness()
+                pendingJob = null
+              }
+          }
+        }
+      }
+    }
+
+  override fun onCreate() {
+    super.onCreate()
+    createNotificationChannel()
+    startForeground(
+      NOTIFICATION_ID,
+      NotificationCompat.Builder(this, CHANNEL_ID)
+        .setContentTitle("AutoBrightnessDelay running")
+        .setSmallIcon(android.R.drawable.ic_menu_view)
+        .setOngoing(true)
+        .build(),
+    )
+    IntentFilter().apply {
+      addAction(Intent.ACTION_SCREEN_OFF)
+      addAction(Intent.ACTION_SCREEN_ON)
+      addAction(Intent.ACTION_USER_PRESENT)
+      registerReceiver(screenReceiver, this, RECEIVER_NOT_EXPORTED)
+    }
+  }
+
+  override fun onDestroy() {
+    pendingJob?.cancel()
+    scope.cancel()
+    unregisterReceiver(screenReceiver)
+    super.onDestroy()
+  }
+
+  override fun onBind(intent: Intent?): IBinder? = null
+
+  private fun disableAutoBrightness() {
+    if (!Settings.System.canWrite(this)) return
+    Settings.System.putInt(
+      contentResolver,
+      Settings.System.SCREEN_BRIGHTNESS_MODE,
+      Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL,
+    )
+  }
+
+  private fun enableAutoBrightness() {
+    if (!Settings.System.canWrite(this)) return
+    Settings.System.putInt(
+      contentResolver,
+      Settings.System.SCREEN_BRIGHTNESS_MODE,
+      Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC,
+    )
+  }
+
+  private fun createNotificationChannel() {
+    NotificationManagerCompat.from(this)
+      .createNotificationChannel(
+        NotificationChannelCompat.Builder(CHANNEL_ID, NotificationManagerCompat.IMPORTANCE_MIN)
+          .setName("AutoBrightnessDelay Service")
+          .setSound(null, null)
+          .build()
+      )
+  }
+}