Use of finish() in android activity

by Unknown Tuesday, April 08, 2014 0 comments Android Tutorial

Intro:
finish() it lets system to know that the developer wants the Activity to be finish, after finish it calls ondestroy() 

ondestroy() is for final cleanup ie.

• closing open connections,readers,writers
• dismiss any dialog the activity was running
• close any cursors the activity was running

finish current activity:
To finish current activity use finish() in Intent.

 Intent intent = new Intent(FirstActivity.this, SecondActivity.Class);  
 intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  
 startActivity(intent);  
 finish();   

finish firstactivity from secondactivity:
To finish any Activity from another Activity (ie.Firstactivity.class from SecondActivty.class)
FirstActivity.class

 public static Activity firstIntent;  

in onCreate() function

 firstIntent = this;  

SecondActivity.class

 firstIntent.finish();  

Now firstactivity.class will finished from secondactivity.class.