Android：实时更新时间

心想着也就是更新精确到分钟，不用精确到秒，定时器就没有必要，系统是有广播Intent.ACTION_TIME_TICK可以直接用

动态注册广播

主方法里面调用一下

//要先设置一下当前时间，不然刷新时间会等到1分钟后再刷新
tv_HM.setText(getHM());IntentFilter filter=new IntentFilter();
filter.addAction(Intent.ACTION_TIME_TICK);
registerReceiver(receiver,filter);

接收广播并处理

private final BroadcastReceiver receiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (action.equals(Intent.ACTION_TIME_TICK)) {tv_HM.setText(getHM());}}};

精确到时:分的方法 

    public String getHM(){Calendar c = Calendar.getInstance();int hour = c.get(Calendar.HOUR_OF_DAY);int minute = c.get(Calendar.MINUTE);return hour + ":" +minute;}