How can I redirect to another activity after returning from the screen lock or other app?

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How can I redirect to another activity after returning from the screen lock or other app?

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#1 by (1 votes)

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I have a simple app with a login, what I want is that in "x" number of activies when the user changes the application or the screen is blocked when returning to the app return to a specific activity (the login). For example: I am in the app in activity "A" and in the onStart () method or when I retrieve the visibility of the activity "A" but only if it comes from a screen lock or it recovers the first plane the app sends me to the activity of "B" (the login) and not "A".

Thanks in advance.

android

asked by Michael Emir 30.03.2016 в 00:41

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1 answer

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score 1 · Answer 1

It occurs to me that this idea is the simplest, detecting when the screen has been blocked:

We add a variable to validate if the screen was blocked and another to validate when the application was changed:

 private boolean seBloqueoPantalla;
 private boolean cambioAplicacion;

within onPause() we change the value of the variable seBloqueoPantalla to "true", if we detect screen lock:

@Override
protected void onPause() {
    PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
    boolean isScreenOn = powerManager.isScreenOn();
    if (!isScreenOn) {
        Log.i(TAG, "La pantalla ha sido bloqueada");
        seBloqueoPantalla = true;
    }
    super.onPause();
}

and using the onStop() method we change the value of the variable cambioAplicacion to "true", if we detect that we change the application:

   @Override
    protected void onStop() {
        cambioAplicacion = true;
        super.onStop();
    }

Using the onResume() method, you can perform an "login" activity, depending on the state of the variable seBloqueoPantalla and cambioAplicacion :

@Override
protected void onResume() {
    if(seBloqueoPantalla && cambioAplicacion) {
        //Redirecciona a la actividad Login!.
        Intent myIntent = new Intent(this, LoginActivity.class);
        startActivity(myIntent);
        //reiniciamos valores.
        seBloqueoPantalla = false; 
        cambioAplicacion = false;
    }
    super.onResume();
}