[Android] 뒤로 버튼 두번 눌러서 종료하기

package com.hamon.testandroid;
 
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();
        }
    }
 
    private void showGuide() {
        toast = Toast.makeText(activity, "뒤로 버튼을 한번 더 누르시면 종료됩니다.",
                Toast.LENGTH_SHORT);
        toast.show();
    }
}

public class HomeActivity extends Activity ... {
 
    private BackPressCloseHandler backPressCloseHandler;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home_layout);
        ...
        backPressCloseHandler = new BackPressCloseHandler(this);
    }
 
    @Override
    public void onBackPressed() {
        backPressCloseHandler.onBackPressed();
    }
}

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