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 ?

Answer 1

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

Answer 2

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!