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显示效果：

         Android使用线程更新系统时间到TextView 

1.添加TextView控件

 2.获取控件

3.启动线程

@Overrideprotected void onStart() {super.onStart();Thread t = getThread(tv);t.start();System.out.println("线程已启动===>线程名："+t.getName()+" 线程ID: "+t.getId()+" 线程状态: "+t.getState()+ " Alive: "+t.isAlive()+" Daemon: "+t.isDaemon());}

 

 4.在线程中更新UI

 @NonNullprivate Thread getThread(TextView tv) {Thread t = new Thread(() -> {while (true){try {DateTimeFormatter fmt = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");tv.setText(LocalDateTime.now().format(fmt));Thread.sleep(1);} catch (InterruptedException e) {System.out.println("===>thread catch error: "+e.getMessage());break;}}});t.setDaemon(true);t.setName("_thread_update_time_to_ui");return t;}

 源码地址：  

https://github.com/tonyimax/UpdateTimeByThread.git