Add new events and accompanying logic to notify when the app is paused and resumed on Android devices.

platform/android/java/lib/src/org/godotengine/godot/Godot.java

@@ -669,12 +669,7 @@ public abstract class Godot extends Activity implements SensorEventListener, IDo
 			return;
 		}
 		mView.onPause();
-		mView.queueEvent(new Runnable() {
-			@Override
-			public void run() {
-				GodotLib.focusout();
-			}
-		});
+
 		mSensorManager.unregisterListener(this);
 
 		for (int i = 0; i < singleton_count; i++) {
@@ -703,6 +698,7 @@ public abstract class Godot extends Activity implements SensorEventListener, IDo
 	@Override
 	protected void onResume() {
 		super.onResume();
+		activityResumed = true;
 		if (!godot_initialized) {
 			if (null != mDownloaderClientStub) {
 				mDownloaderClientStub.connect(this);
@@ -711,12 +707,7 @@ public abstract class Godot extends Activity implements SensorEventListener, IDo
 		}
 
 		mView.onResume();
-		mView.queueEvent(new Runnable() {
-			@Override
-			public void run() {
-				GodotLib.focusin();
-			}
-		});
+
 		mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_GAME);
 		mSensorManager.registerListener(this, mGravity, SensorManager.SENSOR_DELAY_GAME);
 		mSensorManager.registerListener(this, mMagnetometer, SensorManager.SENSOR_DELAY_GAME);
@@ -737,8 +728,6 @@ public abstract class Godot extends Activity implements SensorEventListener, IDo
 
 			singletons[i].onMainResume();
 		}
-
-		activityResumed = true;
 	}
 
 	public void UiChangeListener() {

platform/android/java/lib/src/org/godotengine/godot/GodotLib.java

@@ -211,4 +211,16 @@ public class GodotLib {
 	 * Invoked on the GL thread to configure the height of the virtual keyboard.
 	 */
 	public static native void setVirtualKeyboardHeight(int p_height);
+
+	/**
+	 * Invoked on the GL thread when the {@link GodotRenderer} has been resumed.
+	 * @see GodotRenderer#onActivityResumed()
+	 */
+	public static native void onRendererResumed();
+
+	/**
+	 * Invoked on the GL thread when the {@link GodotRenderer} has been paused.
+	 * @see GodotRenderer#onActivityPaused()
+	 */
+	public static native void onRendererPaused();
 }

platform/android/java/lib/src/org/godotengine/godot/GodotRenderer.java

@@ -40,7 +40,14 @@ import org.godotengine.godot.utils.GLUtils;
  */
 class GodotRenderer implements GLSurfaceView.Renderer {
 
+	private boolean activityJustResumed = false;
+
 	public void onDrawFrame(GL10 gl) {
+		if (activityJustResumed) {
+			GodotLib.onRendererResumed();
+			activityJustResumed = false;
+		}
+
 		GodotLib.step();
 		for (int i = 0; i < Godot.singleton_count; i++) {
 			Godot.singletons[i].onGLDrawFrame(gl);
@@ -58,4 +65,14 @@ class GodotRenderer implements GLSurfaceView.Renderer {
 	public void onSurfaceCreated(GL10 gl, EGLConfig config) {
 		GodotLib.newcontext(GLUtils.use_32);
 	}
+
+	void onActivityResumed() {
+		// We defer invoking GodotLib.onRendererResumed() until the first draw frame call.
+		// This ensures we have a valid GL context and surface when we do so.
+		activityJustResumed = true;
+	}
+
+	void onActivityPaused() {
+		GodotLib.onRendererPaused();
+	}
 }

platform/android/java/lib/src/org/godotengine/godot/GodotView.java

@@ -68,6 +68,7 @@ public class GodotView extends GLSurfaceView {
 
 	private final Godot activity;
 	private final GodotInputHandler inputHandler;
+	private final GodotRenderer godotRenderer;
 
 	public GodotView(Godot activity, XRMode xrMode, boolean p_use_gl3, boolean p_use_32_bits, boolean p_use_debug_opengl) {
 		super(activity);
@@ -77,6 +78,7 @@ public class GodotView extends GLSurfaceView {
 
 		this.activity = activity;
 		this.inputHandler = new GodotInputHandler(this);
+		this.godotRenderer = new GodotRenderer();
 		init(xrMode, false, 16, 0);
 	}
 
@@ -161,10 +163,38 @@ public class GodotView extends GLSurfaceView {
 		}
 
 		/* Set the renderer responsible for frame rendering */
-		setRenderer(new GodotRenderer());
+		setRenderer(godotRenderer);
 	}
 
 	public void onBackPressed() {
 		activity.onBackPressed();
 	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+
+		queueEvent(new Runnable() {
+			@Override
+			public void run() {
+				// Resume the renderer
+				godotRenderer.onActivityResumed();
+				GodotLib.focusin();
+			}
+		});
+	}
+
+	@Override
+	public void onPause() {
+		super.onPause();
+
+		queueEvent(new Runnable() {
+			@Override
+			public void run() {
+				GodotLib.focusout();
+				// Pause the renderer
+				godotRenderer.onActivityPaused();
+			}
+		});
+	}
 }