public class LockActivity extends Activity{

	private  static final int FLAG_HOMEKEY_DISPATCHED = 0x80000000;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		// TODO Auto-generated method stub

		super.onCreate(savedInstanceState);

		this.getWindow().setFlags(FLAG_HOMEKEY_DISPATCHED, FLAG_HOMEKEY_DISPATCHED);//关键代码

		setContentView(R.layout.activity_main);

	}

	@SuppressWarnings("static-access")

	@Override

	public boolean onKeyDown(int keyCode, KeyEvent event) {

		if(keyCode==event.KEYCODE_BACK){

			return true;

		}

		if(keyCode==event. KEYCODE_HOME){

			return true;

		}

		if(keyCode == KeyEvent.KEYCODE_MENU) {//MENU键

	        //监控/拦截菜单键

	         return true;

	    }

		return super.onKeyDown(keyCode, event);

	}

}