Android Handler and Message and Timer

定义相关变量

private Handler uHandler;
  private TimerTask task;
  private Timer timer = new Timer();;

实现相关代码

Handler 部分：用于处理接收到的消息，根据msg.what部分进行相关消息处理，其中消息有来之Timer与线程

uHandler = new Handler(){
          @Override
          public void handleMessage(Message msg)
          {
            super.handleMessage(msg);
            switch (msg.what)
            {
              case 0:
                // show Begin time when press Play menu
                bTime.setText("Begin time: " + nowdate.format(new Date()));
                    break;
              case 1:
                // show current time while runin is on going
                cTime.setText("Current time: " + nowdate.format(new Date()));
                if (runTime >= 3600)
                {
                  hour ++;
                  runTime = 0;
                }
                pTime.setText("Run time: " + hour +":" + runTime/60 + "  ");
                break;
              case 2:
                // no video found message
                Toast.makeText(getApplicationContext(), "No Video found!", Toast.LENGTH_LONG).show();
                break;
              case 3:
                // video found message
                Toast.makeText(getApplicationContext(), "Runin video was found, get ready!", Toast.LENGTH_LONG).show();               
                break;
              case 4:
                // Fail conditions
                Log.e(TAG, "Got Message for Fail");
                setRuninResults(1);  
                break;
              case 5:
                // Fass conditions
                setRuninResults(0); 
                break;
              
            }
          }
        };

Timer 与Message 部分：实现向Handler发送消息，该部分主要为后台运行的部分，与线程类似。

timer.schedule(task, 0, 1000);  /* Now start to Counter */

                task = new TimerTask(){
          @Override
          public void run()
          {
            runTime ++;
            if (hour >= RuninTime)
            {
              Message msg = new Message();
                        msg.what = 5;
                        uHandler.sendMessage(msg);
            }else
            {
              Message msg = new Message();
                        msg.what = 1;
                        uHandler.sendMessage(msg);
            }
          }
        };

Thread 线程部分：线程最简单的创建方法，通过线程向Handler发送消息

new Thread(){
          @Override
          public void run(){
            if (!findRuninVideo("/mnt"))
            {
              Message msg = new Message();
              msg.what = 2;
              uHandler.sendMessage(msg);
            }
            else
            {
              Message msg = new Message();
              msg.what = 3;
              uHandler.sendMessage(msg);
              runinVideo = playList.get(0);
            }
            Log.d(TAG, "Thread exit success!");
          }
        }.start();