Android basic tutorial _ press the two return key to exit the program and long press the return key to exit the program

The above two functions mainly refer to the blog:

Http://blog.csdn.net/chenshijun0101/article/details/7682210

Http://blog.csdn.net/winlinking/article/details/6596455

Method 1:

Press the return key twice to exit the program:

Public class exit {

private boolean isExit = false;private Runnable task = new Runnable() {@Overridepublic void run() {isExit = false;}};public void doExitInOneSecond() {isExit = true;HandlerThread thread = new HandlerThread("doTask");thread.start();new Handler(thread.getLooper()).postDelayed(task, 1000);}public boolean isExit() {return isExit;}public void setExit(boolean isExit) {this.isExit = isExit;}}

Activity:

Public class back2finishappactivity extends activity {exit = new exit ();/** called when the activity is first created. * // @ override public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main) ;}@ override public Boolean onkeydown (INT keycode, keyevent event) {If (keycode = keyevent. keycode_back) {pressagainexit (); Return true;} return Super. onkeydown (keycode, event);} private void pressagainexit () {If (exit. isexit () {finish ();} else {toast. maketext (getapplicationcontext (), "exit the program again", toast. length_short ). show (); exit. doexitinonesecond ();}}}

Long press the return key to exit the program:

public boolean dispatchKeyEvent(KeyEvent event)      {          int keyCode=event.getKeyCode();          switch(keyCode)          {              case KeyEvent.KEYCODE_BACK: {                   if(event.isLongPress())                   {                       this.stopService(intent);                       System.exit(0);                       return true;                   }else                   {                       return false;                       }              }            }          return super.dispatchKeyEvent(event);                }

Method 2:

1. Private long exittime = 0;
2.  
3. @ Override
4. Public Boolean onkeydown (INT keycode, keyevent event ){
5. If (keycode = keyevent. keycode_back & event. getaction () = keyevent. action_down ){
6. If (system. currenttimemillis ()-exittime)> 2000 ){
7. Toast. maketext (getapplicationcontext (), "exit the program once again", Toast. length_short). Show ();
8. Exittime = system. currenttimemillis ();
9. } Else {
10. Finish ();
11. System. Exit (0 );
12. }
13. Return true;
14. }
15. Return super. onkeydown (keycode, event );
16. }

Welcome reprinted: http://blog.csdn.net/johnny901114/article/details/7823048