AndroidFacebook锁屏通知

Question

在最新版本的Android应用上，Facebook显示了锁屏通知功能，就像这张截图：

有没有人试图实现这一点？

我知道在锁定屏幕上显示活动是很简单的，但不幸的是，它不能与半透明的背景工作。基本上它是工作的，但在我们的活动下面，我们看到的是启动器屏幕，而不是锁定屏幕（就像锁定屏幕在这种情况下也是透明的）。

getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);

@android:style/Theme.Translucent.NoTitleBar

<uses-permission android:name="android.permission.DISABLE_KEYGUARD" />

另外，我注意到锁屏通知获取触摸，所以我们不能通过手势显示来自statusbar的通知。

在Android L发布之前，有什么想法可以创建这样的通知。

Answer 1

实际上，ferdy182是在做什么。

以下是我使用android.permission.system_alert_window获得的信息：

因此，我不能使用activity来完成此操作。就是不行。我必须实现一个服务，该服务使用WindowManager添加了一个视图。

public class MyService extends Service {

    View mView;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();

        // instance of WindowManager
        WindowManager mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

        LayoutInflater mInflater = (LayoutInflater) 
                                      getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        // inflate required layout file
        mView = mInflater.inflate(R.layout.abc, null);

        // attach OnClickListener
        mView.findViewById(R.id.some_id).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // you can fire an Intent accordingly - to deal with the click event
                // stop the service - this also removes `mView` from the window
                // because onDestroy() is called - that's where we remove `mView`
                stopSelf();
            }
        });

        // the LayoutParams for `mView`
        // main attraction here is `TYPE_SYSTEM_ERROR`
        // as you noted above, `TYPE_SYSTEM_ALERT` does not work on the lockscreen
        // `TYPE_SYSTEM_OVERLAY` works very well but is focusable - no click events
        // `TYPE_SYSTEM_ERROR` supports all these requirements
        WindowManager.LayoutParams mLayoutParams = new WindowManager.LayoutParams(
            ViewGroup.LayoutParams.WRAP_CONTENT, 
            ViewGroup.LayoutParams.WRAP_CONTENT, 0, 0,
            WindowManager.LayoutParams.TYPE_SYSTEM_ERROR,
            WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                    | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, 
                      PixelFormat.RGBA_8888);

        // finally, add the view to window
        mWindowManager.addView(mView, mLayoutParams);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        // remove `mView` from the window
        removeViewFromWindow();
    }

    // Removes `mView` from the window
    public void removeNow() {
        if (mView != null) {
            WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
            wm.removeView(mView);
        }
    }
}

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />