How to catch event with hardware back button on android?

Question

How to catch event with hardware back button on android ? I need to supress user to go back and I when click on back button on phone to show message and not to go on previou

Answer 1

you can do by this

1. override the onBackPressed() method into your Activity like this way

   public void onBackPressed(){
        // do something here and don't write super.onBackPressed()
   }
   

2. override the onKeyDown() method

   @Override
   public boolean onKeyDown(int keyCode, KeyEvent event) {
       switch(keyCode){
       case KeyEvent.KEYCODE_BACK:
           // do something here 
           return true;
       }
       return super.onKeyDown(keyCode, event);
   }
   

Answer 2

You can suppress user "back" action with onKeyDown() in your activity like this:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
    if ((keyCode == KeyEvent.KEYCODE_BACK))
    {
        //do actions like show message
        return false;
    }
    return super.onKeyDown(keyCode, event);
}

Answer 3

Override the method onBackPressed() in whatever Activity you want to create a different behaviour to the back button.

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