Detect Key action

To detect key action of Android device from user, you can override the methods onKeyDown() and onKeyUp().

Example:

package com.AndroidKey;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.widget.Toast;

public class AndroidKey extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

 @Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
  // TODO Auto-generated method stub
  
  switch(keyCode){
  case KeyEvent.KEYCODE_MENU:
   Toast.makeText(AndroidKey.this, "KEYCODE_MENU", Toast.LENGTH_LONG).show();
   return true;
  case KeyEvent.KEYCODE_SEARCH:
   Toast.makeText(AndroidKey.this, "KEYCODE_SEARCH", Toast.LENGTH_LONG).show();
   return true;
  //...more case...
  default:
   return super.onKeyDown(keyCode, event);
  }
 }
}