Android 时间倒计时

Android时间倒计时在网上一搜就一堆，而且也经常用到。备份一下，以便下次直接使用

1、首先我创建一个接口，为什么要创建一个接口呢？因为我是建立了一个类继承CountDownTimer。这样做的意义就是不用每次

需要用到的倒计时的时候不需要在Activity里面创建直接调用就可以了。

public interface OnCountDownTimeListener {
void getCountDownTime(int time);
void timeOver();

}

2、倒计时的实现类如下：

public class CountDownThread extends CountDownTimer {
private final static String TAG = CountDownThread.class.getSimpleName();
/**
* @param millisInFuture The number of millis in the future from the call
* to {@link #start()} until the countdown is done and {@link #onFinish()}
* is called.
* @param countDownInterval The interval along the way to receive
* {@link #onTick(long)} callbacks.
*/

private OnCountDownTimeListener listener;

Handler mHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what){
case 1:
// Log.i(TAG, "还剩"+msg.arg1+"秒");
listener.getCountDownTime(msg.arg1);
break;
case 2:
// Log.i(TAG, "倒计时结束");
listener.timeOver();
break;
}

}
};

public CountDownThread(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}

public void setOnCountDownTimeListener(OnCountDownTimeListener listener){
this.listener = listener;
}

@Override
public void onTick(long millisUntilFinished) {
// Log.i(TAG, "还剩"+millisUntilFinished/1000+"秒");
Message msg = new Message();
msg.what = 1;
msg.arg1 = (int)millisUntilFinished/1000;
mHandler.sendMessage(msg);
}

@Override
public void onFinish() {

Message msg = new Message();
msg.what = 2;
mHandler.sendMessage(msg);
}
}

3、在Activity的调用，其中使用了butterknife

public class CountDownActivity extends Activity implements OnCountDownTimeListener{

private final static String TAG = CountDownActivity.class.getSimpleName();
private CountDownThread countDownThread;
@BindView(R.id.count_down)
TextView textView;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_count_down);
ButterKnife.bind(this);
startCountDownTime(5);
}

//开始时间倒计时
private void startCountDownTime(int time) {
if (countDownThread != null) {
countDownThread.cancel();
}
countDownThread = new CountDownThread(time * 1000, 1000);
countDownThread.setOnCountDownTimeListener(this);
countDownThread.start();
}

@Override
public void getCountDownTime(int time) {
textView.setText(String.valueOf(time));
}

@Override
public void timeOver() {
textView.setText(String.valueOf("倒计时结束"));
}

}

4、相应的布局

<?xml version="1.0" encoding="utf-8"?>
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
android:id="@+id/count_down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="hello world"/>

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