android 利用hangler记时

上面一个编辑框输入要倒计时的数字
获取以后显示在下面的textview上面
点击开始，textview上的数字逐减

private TextView tvTime;    private EditText  inputTv;    private Button btnHQ,btnBG,btnZT;    //用来存放倒计时的数字    private int i;    private Timer timer;    private TimerTask task;public void onClick(View v) {switch (v.getId()) {case R.id.button1:String time = inputTv.getText().toString();tvTime.setText(time);i = Integer.parseInt(time);break;case R.id.button2:start();break;case R.id.button3:timer.cancel();break;}}

Handler mHandler = new Handler(){        public void handleMessage(android.os.Message msg) {            tvTime.setText(msg.arg1+"");                //等于零的时候不在自减            if(msg.arg1==0){                timer.cancel();            }else{            start();            }            };    };

private void start() {        timer = new Timer();        task = new TimerTask() {            @Override            public void run() {                i--;                Message msg = mHandler.obtainMessage();                //将i放入msg里面                msg.arg1 = i;                mHandler.sendMessage(msg);            }        };        //一定要记得部署这个方法        timer.schedule(task, 1000);    }