diff --git a/app/GioView.java b/app/GioView.java
index 5300ec42..ea550723 100644
--- a/app/GioView.java
+++ b/app/GioView.java
@@ -113,7 +113,9 @@ public final class GioView extends SurfaceView {
 	}
 
 	@Override public boolean onKeyDown(int keyCode, KeyEvent event) {
-		onKeyEvent(nhandle, keyCode, event.getUnicodeChar(), event.getEventTime());
+		if (nhandle != 0) {
+			onKeyEvent(nhandle, keyCode, event.getUnicodeChar(), event.getEventTime());
+		}
 		return false;
 	}
 
@@ -229,6 +231,9 @@ public final class GioView extends SurfaceView {
     }
 
 	private void dispatchMotionEvent(MotionEvent event) {
+		if (nhandle == 0) {
+			return;
+		}
 		for (int j = 0; j < event.getHistorySize(); j++) {
 			long time = event.getHistoricalEventTime(j);
 			for (int i = 0; i < event.getPointerCount(); i++) {
@@ -289,12 +294,16 @@ public final class GioView extends SurfaceView {
 	}
 
 	@Override protected boolean fitSystemWindows(Rect insets) {
-		onWindowInsets(nhandle, insets.top, insets.right, insets.bottom, insets.left);
+		if (nhandle != 0) {
+			onWindowInsets(nhandle, insets.top, insets.right, insets.bottom, insets.left);
+		}
 		return true;
 	}
 
 	@Override protected void onDraw(Canvas canvas) {
-		onFrameCallback(nhandle);
+		if (nhandle != 0) {
+			onFrameCallback(nhandle);
+		}
 	}
 
 	int getDensity() {
@@ -306,25 +315,39 @@ public final class GioView extends SurfaceView {
 	}
 
 	public void start() {
-		onStartView(nhandle);
+		if (nhandle != 0) {
+			onStartView(nhandle);
+		}
 	}
 
 	public void stop() {
-		onStopView(nhandle);
+		if (nhandle != 0) {
+			onStopView(nhandle);
+		}
 	}
 
 	public void destroy() {
+		if (nhandle != 0) {
+			onDestroyView(nhandle);
+		}
+	}
+
+	protected void unregister() {
 		setOnFocusChangeListener(null);
 		getHolder().removeCallback(surfCallbacks);
-		onDestroyView(nhandle);
 		nhandle = 0;
 	}
 
 	public void configurationChanged() {
-		onConfigurationChanged(nhandle);
+		if (nhandle != 0) {
+			onConfigurationChanged(nhandle);
+		}
 	}
 
 	public boolean backPressed() {
+		if (nhandle == 0) {
+			return false;
+		}
 		return onBack(nhandle);
 	}
 
diff --git a/app/os_android.go b/app/os_android.go
index 40b8b9b4..b80ae749 100644
--- a/app/os_android.go
+++ b/app/os_android.go
@@ -161,6 +161,7 @@ var gioView struct {
 	setNavigationColor C.jmethodID
 	setStatusColor     C.jmethodID
 	setFullscreen      C.jmethodID
+	unregister         C.jmethodID
 }
 
 // ViewEvent is sent whenever the Window's underlying Android view
@@ -315,6 +316,7 @@ func Java_org_gioui_GioView_onCreateView(env *C.JNIEnv, class C.jclass, view C.j
 		m.setNavigationColor = getMethodID(env, class, "setNavigationColor", "(II)V")
 		m.setStatusColor = getMethodID(env, class, "setStatusColor", "(II)V")
 		m.setFullscreen = getMethodID(env, class, "setFullscreen", "(Z)V")
+		m.unregister = getMethodID(env, class, "unregister", "()V")
 	})
 	view = C.jni_NewGlobalRef(env, view)
 	wopts := <-mainWindow.out
@@ -325,6 +327,9 @@ func Java_org_gioui_GioView_onCreateView(env *C.JNIEnv, class C.jclass, view C.j
 		}
 		windows[wopts.window] = w
 	}
+	if w.view != 0 {
+		w.detach(env)
+	}
 	w.view = view
 	w.callbacks.SetDriver(w)
 	handle := C.jlong(view)
@@ -339,11 +344,7 @@ func Java_org_gioui_GioView_onCreateView(env *C.JNIEnv, class C.jclass, view C.j
 //export Java_org_gioui_GioView_onDestroyView
 func Java_org_gioui_GioView_onDestroyView(env *C.JNIEnv, class C.jclass, handle C.jlong) {
 	w := views[handle]
-	w.callbacks.Event(ViewEvent{View: 0})
-	w.callbacks.SetDriver(nil)
-	delete(views, handle)
-	C.jni_DeleteGlobalRef(env, w.view)
-	w.view = 0
+	w.detach(env)
 }
 
 //export Java_org_gioui_GioView_onStopView
@@ -442,6 +443,15 @@ func Java_org_gioui_GioView_onWindowInsets(env *C.JNIEnv, class C.jclass, view C
 	}
 }
 
+func (w *window) detach(env *C.JNIEnv) {
+	callVoidMethod(env, w.view, gioView.unregister)
+	w.callbacks.Event(ViewEvent{})
+	w.callbacks.SetDriver(nil)
+	delete(views, C.jlong(w.view))
+	C.jni_DeleteGlobalRef(env, w.view)
+	w.view = 0
+}
+
 func (w *window) setVisible() {
 	width, height := C.ANativeWindow_getWidth(w.win), C.ANativeWindow_getHeight(w.win)
 	if width == 0 || height == 0 {