自由手記

package com.*****.***.****;
import! android.app.*;
import! android.content.*;
import! android.os.*;
import! android.view.*;
import! android.widget.*;

public class mainactivity extends Activity{
private boolean m_bFlag = false;
private Handler m_hHandler;

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

m_hHandler = new Handler() {

@Override

public void handleMessage(Message msg) {

if(msg.what == 0) {

m_bFlag = false;

}

}

};

}

public boolean onKeyDown(int KeyCode, KeyEvent event){

super.onKeyDown(KeyCode, event);

if(event.getAction() == KeyEvent.ACTION_DOWN) {

switch(KeyCode) {

case KeyEvent.KEYCODE_BACK:

if(!m_bFlag) {

Toast.makeText(getApplicationContext(), "按一下後退按鈕，再一次將被關閉",     Toast.LENGTH_SHORT).show();

m_bFlag = true;

m_hHandler.sendEmptyMessageDelayed(0, 2000);

return false;

}

else {

finish();

}

return true;

}

}

return false;

}

}