Android Handler and Message and Timer

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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();