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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.base;
import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Window;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
* Basic application functionality that should be shared among all browser applications.
*/
public class BaseChromiumApplication extends Application {
/**
* Interface to be implemented by listeners for window focus events.
*/
public interface WindowFocusChangedListener {
/**
* Called when the window focus changes for {@code activity}.
* @param activity The {@link Activity} that has a window focus changed event.
* @param hasFocus Whether or not {@code activity} gained or lost focus.
*/
public void onWindowFocusChanged(Activity activity, boolean hasFocus);
}
private ObserverList<WindowFocusChangedListener> mWindowFocusListeners =
new ObserverList<WindowFocusChangedListener>();
/**
* Intercepts calls to an existing Window.Callback. Most invocations are passed on directly
* to the composed Window.Callback but enables intercepting/manipulating others.
*
* This is used to relay window focus changes throughout the app and remedy a bug in the
* appcompat library.
*/
private class WindowCallbackProxy implements InvocationHandler {
private final Window.Callback mCallback;
private final Activity mActivity;
public WindowCallbackProxy(Activity activity, Window.Callback callback) {
mCallback = callback;
mActivity = activity;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getName().equals("onWindowFocusChanged") && args.length == 1
&& args[0] instanceof Boolean) {
onWindowFocusChanged((boolean) args[0]);
return null;
} else if (method.getName().equals("dispatchKeyEvent") && args.length == 1
&& args[0] instanceof KeyEvent) {
return dispatchKeyEvent((KeyEvent) args[0]);
} else {
try {
return method.invoke(mCallback, args);
} catch (InvocationTargetException e) {
// Special-case for when a method is not defined on the underlying
// Window.Callback object. Because we're using a Proxy to forward all method
// calls, this breaks the Android framework's handling for apps built against
// an older SDK. The framework expects an AbstractMethodError but due to
// reflection it becomes wrapped inside an InvocationTargetException. Undo the
// wrapping to signal the framework accordingly.
if (e.getCause() instanceof AbstractMethodError) {
throw e.getCause();
}
throw e;
}
}
}
public void onWindowFocusChanged(boolean hasFocus) {
mCallback.onWindowFocusChanged(hasFocus);
for (WindowFocusChangedListener listener : mWindowFocusListeners) {
listener.onWindowFocusChanged(mActivity, hasFocus);
}
}
public boolean dispatchKeyEvent(KeyEvent event) {
// TODO(aurimas): remove this once AppCompatDelegateImpl no longer steals
// KEYCODE_MENU. (see b/20529185)
if (event.getKeyCode() == KeyEvent.KEYCODE_MENU && mActivity.dispatchKeyEvent(event)) {
return true;
}
return mCallback.dispatchKeyEvent(event);
}
}
@Override
public void onCreate() {
super.onCreate();
ApplicationStatus.initialize(this);
registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
@Override
public void onActivityCreated(final Activity activity, Bundle savedInstanceState) {
Window.Callback callback = activity.getWindow().getCallback();
activity.getWindow().setCallback((Window.Callback) Proxy.newProxyInstance(
Window.Callback.class.getClassLoader(), new Class[] {Window.Callback.class},
new WindowCallbackProxy(activity, callback)));
}
@Override
public void onActivityDestroyed(Activity activity) {
assert Proxy.isProxyClass(activity.getWindow().getCallback().getClass());
}
@Override
public void onActivityPaused(Activity activity) {
assert Proxy.isProxyClass(activity.getWindow().getCallback().getClass());
}
@Override
public void onActivityResumed(Activity activity) {
assert Proxy.isProxyClass(activity.getWindow().getCallback().getClass());
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
assert Proxy.isProxyClass(activity.getWindow().getCallback().getClass());
}
@Override
public void onActivityStarted(Activity activity) {
assert Proxy.isProxyClass(activity.getWindow().getCallback().getClass());
}
@Override
public void onActivityStopped(Activity activity) {
assert Proxy.isProxyClass(activity.getWindow().getCallback().getClass());
}
});
}
/**
* Registers a listener to receive window focus updates on activities in this application.
* @param listener Listener to receive window focus events.
*/
public void registerWindowFocusChangedListener(WindowFocusChangedListener listener) {
mWindowFocusListeners.addObserver(listener);
}
/**
* Unregisters a listener from receiving window focus updates on activities in this application.
* @param listener Listener that doesn't want to receive window focus events.
*/
public void unregisterWindowFocusChangedListener(WindowFocusChangedListener listener) {
mWindowFocusListeners.removeObserver(listener);
}
/** Initializes the {@link CommandLine}. */
public void initCommandLine() {}
/**
* This must only be called for contexts whose application is a subclass of
* {@link BaseChromiumApplication}.
*/
@VisibleForTesting
public static void initCommandLine(Context context) {
((BaseChromiumApplication) context.getApplicationContext()).initCommandLine();
};
}
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