Main Activity



protected void onResume() {
        super.onResume();

        registerBroadcastReceiver();
    }



 private void registerBroadcastReceiver() {
        final IntentFilter theFilter = new IntentFilter();
        theFilter.addAction(Intent.ACTION_SCREEN_ON);
        theFilter.addAction(Intent.ACTION_USER_PRESENT);
        theFilter.addAction(Intent.ACTION_SCREEN_OFF);

        BroadcastReceiver screenOnOffReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                String strAction = intent.getAction();

                KeyguardManager myKM = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);

                if (strAction.equals(Intent.ACTION_SCREEN_OFF) || strAction.equals(Intent.ACTION_USER_PRESENT) || strAction.equals(Intent.ACTION_SCREEN_ON)) {
                    if (myKM.inKeyguardRestrictedInputMode()) {
                        System.out.println("Screen off " + "LOCKED");
                        if (AdActivity.getInstance() == null) {
                            startActivity(new Intent(MainActivity.this, AdActivity.class));
                        }
                    } else {
                        if (AdActivity.getInstance() == null) {
                            System.out.println("Screen off " + "UNLOCKED");
                            startActivity(new Intent(MainActivity.this, AdActivity.class));
                        }
                    }
                }
            }
        };

        getApplicationContext().registerReceiver(screenOnOffReceiver, theFilter);
    }