Move recapture on focus gain logic to InputCaptureProvider

app/src/main/java/com/limelight/binding/input/capture/AndroidNativePointerCaptureProvider.java

@@ -3,6 +3,7 @@ package com.limelight.binding.input.capture;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.os.Build;
+import android.os.Handler;
 import android.view.InputDevice;
 import android.view.MotionEvent;
 import android.view.View;
@@ -36,6 +37,25 @@ public class AndroidNativePointerCaptureProvider extends AndroidPointerIconCaptu
         targetView.releasePointerCapture();
     }
 
+    @Override
+    public void onWindowFocusChanged(boolean focusActive) {
+        if (!focusActive || !isCapturing) {
+            return;
+        }
+
+        // Recapture the pointer if focus was regained. On Android Q,
+        // we have to delay a bit before requesting capture because otherwise
+        // we'll hit the "requestPointerCapture called for a window that has no focus"
+        // error and it will not actually capture the cursor.
+        Handler h = new Handler();
+        h.postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                targetView.requestPointerCapture();
+            }
+        }, 500);
+    }
+
     @Override
     public boolean eventHasRelativeMouseAxes(MotionEvent event) {
         // SOURCE_MOUSE_RELATIVE is how SOURCE_MOUSE appears when our view has pointer capture.

app/src/main/java/com/limelight/binding/input/capture/InputCaptureProvider.java

@@ -33,4 +33,6 @@ public abstract class InputCaptureProvider {
     public float getRelativeAxisY(MotionEvent event) {
         return 0;
     }
+
+    public void onWindowFocusChanged(boolean focusActive) {}
 }