android 再按一次后退键退出应用程…

android 再按一次后退键退出应用程序

private static BooleanisExit = false;

    privatestatic Boolean hasTask = false;

    TimertExit = new Timer();

    TimerTasktask = new TimerTask() {

          

        @Override

        publicvoid run() {

            isExit= false;

            hasTask= true;

        }

    };

      

    @Override

    publicboolean onKeyDown(intkeyCode, KeyEvent event) {

        System.out.println("TabHost_Index.javaonKeyDown");

        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);

            }

        }

        returnfalse;

    }