Android深入浅出学习笔记之多线程及异步处理(2)

        txView=(TextView)findViewById(R.id.textView1); 
        button=(Button)findViewById(R.id.button1); 
        button.setOnClickListener(new OnClickListener() { 
             
            @Override 
            public void onClick(View v) { 
                // TODO Auto-generated method stub 
                 
                //创建一个用于展示前三种后台线程和UI线程交互的线程 
                new TestThread(MainActivity.this).start(); 
                 
                //创建一个用于展示AsyncTask实现交互的TestAsyncTask 
                new TestAsyncTask().execute("Test"," AsyncTask"); 
            } 
        }); 
    } 
     
     
    class TestAsyncTask extends AsyncTask<String, Integer, String> 
    { 
        //TestAsyncTask被后台线程执行后，被UI线程被调用，一般用于初始化界面控件，如进度条 
        @Override 
        protected void onPreExecute() { 
            // TODO Auto-generated method stub 
            super.onPreExecute(); 
        } 
 
        //doInBackground执行完后由UI线程调用，用于更新界面操作 
        @Override 
        protected void onPostExecute(String result) { 
            // TODO Auto-generated method stub 
            txView.setText(result); 
            super.onPostExecute(result);