Android : How to show dialog or activity over lock screen[ not unlock the screen]

Question

I hava a app, it will receive msg from server and make a dialog to user.So when phone is on lock screen i want dialog will show on the top of lock screen but not unlock it.could anyone give me suggestion ?

score 15 · Answer 1 · edited Sep 07 '14 at 07:02

I solved something similar in the following way. Create services, to broadcast the action "ACTION_SCREEN_ON & ACTION_USER_PRESENT & ACTION_SCREEN_OFF", create function to show the windows with WINDOW_SERVICE. I use a service for my requirements, but it can adapt.

public class OverlayService extends Service {

    private static final String TAG = OverlayService.class.getSimpleName();
    WindowManager mWindowManager;
    View mView;
    Animation mAnimation;

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

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        registerOverlayReceiver();
        return super.onStartCommand(intent, flags, startId);
    }

    private void showDialog(String aTitle){
        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

        mView = View.inflate(getApplicationContext(), R.layout.fragment_overlay, null);
        mView.setTag(TAG);

        int top = getApplicationContext().getResources().getDisplayMetrics().heightPixels / 2;

        RelativeLayout dialog = (RelativeLayout) mView.findViewById(R.id.dialog);
        LayoutParams lp = (LayoutParams) dialog.getLayoutParams();
        lp.topMargin = top;
        lp.bottomMargin = top;
        mView.setLayoutParams(lp);

        ImageButton imageButton = (ImageButton) mView.findViewById(R.id.close);
        lp = (LayoutParams) imageButton.getLayoutParams();
        lp.topMargin = top - 58;
        imageButton.setLayoutParams(lp);
        imageButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mView.setVisibility(View.INVISIBLE);
            }
        });

        TextView title = (TextView) mView.findViewById(R.id.Title);
        title.setText(aTitle);

        final WindowManager.LayoutParams mLayoutParams = new WindowManager.LayoutParams(
        ViewGroup.LayoutParams.MATCH_PARENT,
        ViewGroup.LayoutParams.MATCH_PARENT, 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);

        mView.setVisibility(View.VISIBLE);
        mAnimation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.in);
        mView.startAnimation(mAnimation);
        mWindowManager.addView(mView, mLayoutParams);

    }

    private void hideDialog(){
        if(mView != null && mWindowManager != null){
            mWindowManager.removeView(mView);
            mView = null;
        }
    }

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

    private void registerOverlayReceiver() {
        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_USER_PRESENT);
        registerReceiver(overlayReceiver, filter);
    }

    private void unregisterOverlayReceiver() {
        hideDialog();
        unregisterReceiver(overlayReceiver);
    }


    private BroadcastReceiver overlayReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            Log.d(TAG, "[onReceive]" + action);
            if (action.equals(Intent.ACTION_SCREEN_ON)) {
                showDialog("Esto es una prueba y se levanto desde");
            }
            else if (action.equals(Intent.ACTION_USER_PRESENT)) {
                hideDialog();
            }
            else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
                hideDialog();
            }
        }
    };
}

I hope it useful!

i was searching the exact solution, thanks gfirem and Unihedro. — Akshay Paliwal, Feb 27 '15 at 06:48
Thanks! It works but not with FLAG_DISMISS_KEYGUARD https://stackoverflow.com/a/32233473/4229910 — ashwin mahajan, Feb 12 '18 at 11:08

score 13 · Answer 2 · edited Jan 14 '14 at 06:27

13

public void onAttachedToWindow() {
      Window window = getWindow();
      window.addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
           | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
           | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
           | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
}

edited Jan 14 '14 at 06:27

Tamilselvan Kalimuthu

1,534
1
13
28

answered Jan 14 '14 at 06:22

Mohammad Mirzakhani

560
5
12

I was searching for so long ... Thank you! Works on Android 8.0 – Falke Design May 28 '19 at 11:48

Shirish Herwade · Answer 3 · 2014-05-21T12:59:53.340

11

Finally I achieved the same. Don't go for activity, because android will not show lock screen behind your activity for security reason, so use service instead of Activity.

Below is my code in onStartCommand of my service

WindowManager mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

View mView = mInflater.inflate(R.layout.score, null);

WindowManager.LayoutParams mLayoutParams = new WindowManager.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 0, 0,
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
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);

mWindowManager.addView(mView, mLayoutParams);

And add <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> to manifest

edited May 21 '14 at 12:59

answered May 21 '14 at 10:42

Shirish Herwade

11,461
20
72
111

1

thanks, this made the difference for me , Dont use activity if you want to show it on lockscreen and have the lockscreen on the background – Adib Faramarzi Dec 28 '14 at 14:47
@AdibFara So, What shoul we use? – kadik Jul 08 '16 at 08:39
@kadik you can use Service instead, please check the answer above – Shirish Herwade Jul 13 '16 at 07:13

Android : How to show dialog or activity over lock screen[ not unlock the screen]

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