Android使用线程更新系统时间到TextView

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

@Override
    protected 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

 @NonNull
    private 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