android兩次按返回鍵退出程序實現
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;
}
};
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method
stub
if(keyCode ==
KeyEvent.KEYCODE_BACK){
//
System.out.println("user back down");
if(isExit
== false ) {
isExit = true;
Toast.makeText(this, "再按一次退出程序",
Toast.LENGTH_SHORT).show();
if(!hasTask) {
tExit.schedule(task, 2000);
}} else {
}
finish();
System.exit(0);
}
}
return false;
}