Android Continuous Click to exit the program

Package com.test.twiceexit;

Import Java.util.Timer;

Import android.app.Activity;
Import Android.os.Bundle;
Import Android.os.Handler;
Import Android.os.Message;
Import android.view.KeyEvent;
Import Android.view.Menu;
Import Android.widget.Toast;

public class Mainactivity extends Activity {
private static Boolean Isquit = false;
Private long mexittime = 0;

Timer timer = new timer ();

@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.activity_main);
}

@Override
public boolean Oncreateoptionsmenu (Menu menu) {
Inflate the menu; This adds items to the action bar if it is present.
Getmenuinflater (). Inflate (R.menu.main, menu);
return true;
}

/**************************************************
* Method One
* ******************************************** /
//@Override
//public boolean onKeyDown (int keycode, keyevent event) {
//if (keycode = = Keyevent.keycode_ back) {
//if (Isquit = = False) {
//isquit = true;
Toast.maketext (Getbasecontext (), "Press the return key again to exit the program",
//toast.length_short). Show ();
TimerTask task = null;
//task = new TimerTask () {
//public void Run () {
//isquit = false;
}
//};
//timer.schedule (Task, 2000);
//} else {
//finish ();
System.exit (0);
//}
//}
//return false;
//}

/**************************************************
* Method Two
* ************************************************/
@Override
public boolean onKeyDown (int keycode, keyevent event) {
if (keycode = = Keyevent.keycode_back) {
if ((System.currenttimemillis ()-Mexittime) > 2000) {//
Do not exit if the two keystroke interval is greater than 2000 milliseconds
Toast.maketext (This, "Press again to exit the program", Toast.length_short). Show ();
Mexittime = System.currenttimemillis ();//Update Mexittime
} else {
System.exit (0);//Exit the program
//}
return true;
//}
Return Super.onkeydown (KeyCode, event);
//
//}

/**************************************************
* Method Three
* ************************************************/
Handler Mhandler = new Handler () {
@Override
public void Handlemessage (Message msg) {
Super.handlemessage (msg);
Isquit = false;
}
};

@Override
public boolean onKeyDown (int keycode, keyevent event) {
if (keycode = = Keyevent.keycode_back) {
if (!isquit) {
Isquit = true;
Toast.maketext (Getapplicationcontext (), "Press again to exit the program",
Toast.length_short). Show ();
Using handler delay to send Change status information
Mhandler.sendemptymessagedelayed (0, 2000);
} else {
Finish ();
System.exit (0);
}
}
return false;
}
}

Android Continuous Click to exit the program