Run activity only once, then always run the main one

Question

As the title says, Scenario is: On first time using the app, Show Screen A. Once you are done with screen A, the button will lead to you Screen B. From now on and forever, t

Answer 1

All you have to check like this

 SharedPreferences prefs = getSharedPreferences("mySHaredpref", Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = prefs.edit();
    boolean isFirst = prefs.getBoolean("isfirstTime", true);
    if(isFirst) {
        Intent intent = new Intent(this, ActivtyA.class);
        editor.putBoolean(KEY_IS_FIRST_TIME, false);
        editor.commit();
        startActivity(intent);
    }
    else{
      Intent intent = new Intent(this, MainActivty.class);
      startActivity(intent);
    }