Calling button.performClick() automatically just after activity is fully loaded?

Question

I start an activity from a background service which unlocks the phone and starts an activity. What I want to achieve is to go to home screen just after the activity is loaded. I created a button on the activity that I go to just after unlocking and on its OnClick method I used:

moveTaskToBack(true);

Now, I need to call buttonName.performClick() somewhere but where? I tried onResume and onPause so far, but no luck. How or where can I make sure the activity is fully loaded?

//What I do on my Service to start Activity that unlocks the phone
Intent dialogIntent = new Intent(this, StartStopActivity.class);
                dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(dialogIntent);

This is the activity class:

    public class StartStopActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_start_stop);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON);
        Button returnButton = (Button) findViewById(R.id.button3);
        returnButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                moveTaskToBack(true);
            }
        });
        //returnButton.performClick();


    }

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


    }
}

in the end of onCreate add the function directly which you have called inside click of that button. — Rakshit Nawani, May 05 '16 at 06:59
not working on onCreate, it does return to the home screen and unlocks the phone but for some reason it doesn't turn the screen on. — Kaan Demirel, May 05 '16 at 07:02
Show your code so that I can give you a good answer accordingly — Rakshit Nawani, May 05 '16 at 07:03
@KaanDemirel :: add moveTaskToBack(true); in the end of the onCreate() it will call automatically when that activity is loaded. — Rakshit Nawani, May 05 '16 at 07:08
The problem is, it's actually working and returns to home screen but I cannot see it because screen won't turn on when I call at the end of onCreate. — Kaan Demirel, May 05 '16 at 07:13
@P.Rai Unlock works if I don't do anything. It opens up the activity. — Kaan Demirel, May 05 '16 at 07:25

score 1 · Accepted Answer · answered May 05 '16 at 07:16

 private PowerManager mPowerManager;
 private PowerManager.WakeLock mWakeLock;

 public void turnOnScreen(){
     // turn on screen
     Log.v("ProximityActivity", "ON!");
     mWakeLock = mPowerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "tag");
     mWakeLock.acquire();
}

 @TargetApi(21) //Suppress lint error for PROXIMITY_SCREEN_OFF_WAKE_LOCK
 public void turnOffScreen(){
     // turn off screen
     Log.v("ProximityActivity", "OFF!");
     mWakeLock = mPowerManager.newWakeLock(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK, "tag");
     mWakeLock.acquire();
}

Use startActivityForResult and onActivityResult just turn the screen on and set you parameters to keep the screen on if you want

score 0 · Answer 2 · edited Jun 20 '20 at 09:12

OnClick method will only be called when you click on a view. You just can't invoke it without clicking on anything.

Just copy the code that you have inside your onclick method and put in inside your oncreate(). or anywhere where you want that piece of code to be executed.

It will not be automatically called if you don't actually click on that view to which you have set the click listener.

Change your code like this:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_start_stop);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON);
        moveTaskToBack(true);
    }

If I call moveTaskToBack there, screen is not turning on. – Kaan Demirel May 05 '16 at 07:15 — Kaan Demirel, May 05 '16 at 07:15

Calling button.performClick() automatically just after activity is fully loaded?

2 Answers2