android 再按一次后退键退出应用程序

private

static

Boolean isExit =

false

;

private

static

Boolean hasTask =

false

;

Timer tExit =

new

Timer();

TimerTask task =

new

TimerTask() {

@Override

public

void

run() {

isExit =

false

;

hasTask =

true

;

}

};

@Override

public

boolean

onKeyDown(

int

keyCode,KeyEvent event) {

System.out.println(

"TabHost_Index.java onKeyDown"

);

if

(keyCode == KeyEvent.KEYCODE_BACK) {

if

(isExit ==

false

) {

isExit =

true

;

Toast.makeText(

this

,

"再按一次后退键退出应用程序"

,Toast.LENGTH_SHORT).show();

if

(!hasTask) {

tExit.schedule(task,

2000

);

}

}

else

{

finish();

System.exit(

0

);

}

}

return

false

;

}