fix: use separate thread for dispatching gestures in accessibility service

Author: sds100

base/src/main/java/io/github/sds100/keymapper/base/system/accessibility/BaseAccessibilityService.kt

@@ -11,6 +11,8 @@ import android.content.res.Configuration
 import android.graphics.Path
 import android.graphics.Point
 import android.os.Build
+import android.os.Handler
+import android.os.HandlerThread
 import android.view.KeyEvent
 import android.view.accessibility.AccessibilityEvent
 import android.view.accessibility.AccessibilityNodeInfo
@@ -156,6 +158,12 @@ abstract class BaseAccessibilityService :
 
     abstract fun getController(): BaseAccessibilityServiceController?
 
+    /**
+     * Use a separate thread for dispatching gestures so they do not cause an ANR.
+     */
+    private val gestureHandlerThread: HandlerThread = HandlerThread("gesture_thread")
+    private var gestureHandler: Handler? = null
+
     override fun onCreate() {
         super.onCreate()
         Timber.i("Accessibility service: onCreate")
@@ -210,6 +218,9 @@ abstract class BaseAccessibilityService :
         fingerprintGestureCallback?.let {
             fingerprintGestureController.registerFingerprintGestureCallback(it, null)
         }
+
+        gestureHandlerThread.start()
+        gestureHandler = Handler(gestureHandlerThread.looper)
     }
 
     override fun onUnbind(intent: Intent?): Boolean {
@@ -222,6 +233,8 @@ abstract class BaseAccessibilityService :
     override fun onDestroy() {
         lifecycleRegistry.currentState = Lifecycle.State.DESTROYED
 
+        gestureHandlerThread.quit()
+
         fingerprintGestureController
             .unregisterFingerprintGestureCallback(fingerprintGestureCallback)
 
@@ -352,7 +365,7 @@ abstract class BaseAccessibilityService :
                 addStroke(it)
             }.build()
 
-            val success = dispatchGesture(gestureDescription, null, null)
+            val success = dispatchGesture(gestureDescription, null, gestureHandler)
 
             return if (success) {
                 Success(Unit)
@@ -451,7 +464,7 @@ abstract class BaseAccessibilityService :
             }
         }
 
-        val success = dispatchGesture(gestureBuilder.build(), null, null)
+        val success = dispatchGesture(gestureBuilder.build(), null, gestureHandler)
 
         return if (success) {
             Success(Unit)
@@ -499,7 +512,7 @@ abstract class BaseAccessibilityService :
             gestureBuilder.addStroke(StrokeDescription(p, 0, duration.toLong()))
         }
 
-        val success = dispatchGesture(gestureBuilder.build(), null, null)
+        val success = dispatchGesture(gestureBuilder.build(), null, gestureHandler)
 
         return if (success) {
             Success(Unit)