Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

Android Facebook lock screen notification

On the latest version of Android app Facebook showed lock screen notification feature, like on this screenshot:

screenshot

Did anyone try to implement this?

I know that It's simple to show Activity on top of lock screen, but unfortunately It doesn't work with translucent background. Basically it works but below our activity we see launcher screen, not lock screen (like lock screen in this case would be also transparent).

What I tried right now is:

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);

in my Activity.

Also I tried this example: https://gist.github.com/daichan4649/5352944

And as I described - everything works but no transparency.

From my observation Facebook uses theme:

@android:style/Theme.Translucent.NoTitleBar

and doesn't have permission:

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

Also I noticed that lock screen notification aquires touches so we cannot show notifications from statusbar by gesture.

Any ideas how to create that kind of notification before Android L release.

like image 627
froger_mcs Avatar asked Jul 23 '14 21:07

froger_mcs


People also ask

How do I get notifications on my Lock screen Android?

Open your phone's Settings app. Notifications. Under "Lock screen," tap Notifications on lock screen or On lock screen. Choose Show alerting and silent notifications.

Why are my notifications not showing up on my Lock screen Android?

Enable apps to push notifications and display them on the lock screen: Open Settings, search for and access Apps, locate and access the app in question, and touch Notifications. Enable Allow notifications and set Lock screen notifications to Show.

How do I turn off Facebook Lock screen?

You can access additional settings by tapping on the menu key, then selecting "Home Settings" while the Cover Feed lock screen is displayed. You can turn the lock screen on or off, toggle the display of the status bar, and set data use (low, medium, high). That's it.


1 Answers

Actually, ferdy182 was/is onto something.

Here's what I got using the android.permission.SYSTEM_ALERT_WINDOW:

enter image description here

So, I couldn't do this with an Activity. It just wouldn't work. I had to implement a Service which added a View using the WindowManager.

One possible workflow would be: a broadcast is received by your BroadcastReceiver => it starts a Service => the Service adds the required view.

Now, the code (the comments explain a few things):

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);
        }
    }
}

And finally, add the permission to your app's manifest:

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
like image 194
Vikram Avatar answered Sep 20 '22 13:09

Vikram