Android Handler（六）

本帖最后由 4546 于 2011-8-10 10:30 编辑

java代码：
Log.d("ThreadId", "onCread:" + String.valueOf(Thread.currentThread().getId()));

myHandler = new Handler() {

@Override

public void handleMessage(Message msg) {

switch(msg.what) {

case 0: Bundle date=msg.getData();

txt.setText(String.valueOf(date.getInt("time")));

Log.d("ThreadId", "HandlerMessage:" + String.valueOf(Thread.currentThread().getId()));

Log.d("ThreadId", "msgDate:" + String.valueOf(date.getInt("time")));

break;

}

}

};

btnStart.setOnClickListener(this);

btnStop.setOnClickListener(this);

}

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.btnStartTime:

//myHandler.post(this);

myHandler.postDelayed(this, 1000);

break;

case R.id.btnStopTime:

break;

}

}

@Override

public void run() {

while(true) {

total--;

if(total<0) break;

try {

Thread.sleep(1000);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Message msg=new Message();

Bundle date = new Bundle();

// 存放数据

date.putInt("time", total);

msg.setData(date);

msg.what=0;

Log.d("ThreadId", "POST:" + String.valueOf(Thread.currentThread().getId())); myHandler.sendMessage(msg);

Log.d("ThreadId", "Thread:" + String.valueOf(Thread.currentThread().getId()));

}

}

}

使用POST的方式是将Runnable 一起发送给处理的线程(这里为UI)，如果Runnable的操作比较耗时的话那线程将进入阻塞状态。可以看到先运行 Runnable的Run方法然后在进入 HandleMessage() 。我还尝试了另一种写法，将TimerThreadPOST过去，运行结果是一样的。

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