onKeyDown() or onBackPressed()

Question

I want to implement the back button functionality in my application. In application whenever I'm clicking on back button in middle my control is going to login page directly, so can someone tell me where to override onKeyDown() or onBackPressed() methods?

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        Log.e("back key pressed","Back key pressed");
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

because I'm writing this inside onCreate and outside onCreate also, but it's not working ......

Answer 1

Depends on whether or not you want to support pre-Android 2.0 phones. The onBackPressed() method was added to Android 2.0 (API 5).

You may want to read this post on the Android Developer blog for details:

http://android-developers.blogspot.com/2009/12/back-and-other-hard-keys-three-stories.html

Answer 2

see below code. write outside the onCreate

  @Override  
    public boolean onKeyDown(int keyCode, KeyEvent event)  
  {  
         //replaces the default 'Back' button action  
         if(keyCode==KeyEvent.KEYCODE_BACK)  
         {  

                Intent intent = new Intent(currentActivity.this, RequiredActivity.class);
                finish();
                startActivity(intent); 

         }  
         return true;  
   }