QuickTileService: require SYSTEM_ALERT_WINDOW to start background activity

Due to buggy changes in Android 14, we now need to bother the user about
enabling "draw over other apps" for the quick settings toggle to work
when the app isn't already running.

Link: https://issuetracker.google.com/issues/305035828
Signed-off-by: Jason A. Donenfeld <[email protected]>

Author: zx2c4

ui/src/main/AndroidManifest.xml

@@ -7,6 +7,9 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
+    <uses-permission
+        android:name="android.permission.SYSTEM_ALERT_WINDOW"
+        android:minSdkVersion="34" />
     <uses-permission
         android:name="android.permission.WRITE_EXTERNAL_STORAGE"
         android:maxSdkVersion="28"

ui/src/main/java/com/wireguard/android/QuickTileService.kt

@@ -9,8 +9,10 @@ import android.content.Intent
 import android.graphics.Bitmap
 import android.graphics.Canvas
 import android.graphics.drawable.Icon
+import android.net.Uri
 import android.os.Build
 import android.os.IBinder
+import android.provider.Settings
 import android.service.quicksettings.Tile
 import android.service.quicksettings.TileService
 import android.util.Log
@@ -55,7 +57,7 @@ class QuickTileService : TileService() {
                 val intent = Intent(this, MainActivity::class.java)
                 intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-                    startActivityAndCollapse(PendingIntent.getActivity(this, 0, intent,  PendingIntent.FLAG_IMMUTABLE))
+                    startActivityAndCollapse(PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_IMMUTABLE))
                 } else {
                     @Suppress("DEPRECATION")
                     startActivityAndCollapse(intent)
@@ -68,6 +70,12 @@ class QuickTileService : TileService() {
                             tunnel.setStateAsync(Tunnel.State.TOGGLE)
                             updateTile()
                         } catch (_: Throwable) {
+                            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE && !Settings.canDrawOverlays(this@QuickTileService)) {
+                                val permissionIntent = Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:$packageName"))
+                                permissionIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                                startActivityAndCollapse(PendingIntent.getActivity(this@QuickTileService, 0, permissionIntent, PendingIntent.FLAG_IMMUTABLE))
+                                return@launch
+                            }
                             val toggleIntent = Intent(this@QuickTileService, TunnelToggleActivity::class.java)
                             toggleIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                             startActivity(toggleIntent)