android 计时器

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import android.os.Handler;import android.os.Message;import android.widget.Button;import java.util.Timer;import java.util.TimerTask;/** * Created by ${hang.liu} on 2017/3/8. */public class TimeDown {    private int times;    private long delay;    private Button mtv;    private long period;    private int time2;    public TimeDown(int times, long delay, Button mtv, long period) {        this.times = times;        this.delay = delay;        this.mtv = mtv;        this.period = period;        time2=times;    }    private Handler mHandler=new Handler(){        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            int what = msg.what;            switch (what) {                case 1:                    mtv.setText("" + times);                    break;                case 2:                    times=time2;                    mtv.setText("重新获取验证码");                    mtv.setClickable(true);                    break;            }        }    };    public void timerDown(){        mtv.setClickable(false);        final Timer timer = new Timer();        timer.schedule(new TimerTask() {            @Override            public void run() {                times--;                if (times >= 0) {                    mHandler.sendEmptyMessage(1);                } else {                    timer.cancel();                    mHandler.sendEmptyMessage(2);                    return;                }            }        }, delay, period);    }}
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