뉴키

http://dsnight.tistory.com/14

BackPressCloseHandler.java

import android.app.Activity;
import android.widget.Toast;

public class BackPressCloseHandler {

	private long backKeyPressedTime = 0;
	private Toast toast;

	private Activity activity;

	public BackPressCloseHandler(Activity context) {
		this.activity = context;
	}

	public void onBackPressed() {
		if (System.currentTimeMillis() > backKeyPressedTime + 2000) {
			backKeyPressedTime = System.currentTimeMillis();
			showGuide();
			return;
		}
		if (System.currentTimeMillis() <= backKeyPressedTime + 2000) {
			activity.finish();
			toast.cancel();
		}
	}

	public void showGuide() {
		toast = Toast.makeText(activity,
				"\'뒤로\'버튼을 한번 더 누르시면 종료됩니다.", Toast.LENGTH_SHORT);
		toast.show();
	}
}

MainActivity.java

public class MainActivity extends Activity {

	private BackPressCloseHandler backPressCloseHandler;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		
		backPressCloseHandler = new BackPressCloseHandler(this);
	}

	@Override
	public void onBackPressed() {
		//super.onBackPressed();
		backPressCloseHandler.onBackPressed();
	}
}

http://stackoverflow.com/questions/25205478/issue-with-gcm-push-notification-service-delphi-xe6