线程的一个基本应用：联网进度条对话框

线程总给我一种云里雾里的感觉。感觉她是那么深奥，那么强大。总让我望而生畏。-----杯具

public class HelloXML extends Activity {
        private static final int MESSAGETYPE_01 = 0x0001;
        private ProgressDialog progressDialog = null; 

 

        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                this.setContentView(R.layout.main);        
                
                progressDialog = ProgressDialog.show(HelloXML.this, "下载", "正在下载,请稍候！");                                
                
                new Thread() {
                        public void run() {                        
                                try {
                                        
                                    //   连接网络获取数据

                                } catch (Exception e) {
                                        // 在GUI显示错误提示
                                        // tv.setText("Error: " + e.getMessage());
                                        
                                }
                                
                                Message msg_listData = new Message();
                                msg_listData.what = MESSAGETYPE_01;
                                handler.sendMessage(msg_listData);
                        }
                }.start();
        }

        private Handler handler = new Handler() {                

                public void handleMessage(Message message) {
                        switch (message.what) {
                        case MESSAGETYPE_01:                                        
                        //刷新UI，显示数据，并关闭进度条                        
                                progressDialog.dismiss(); //关闭进度条
                                break;
                        }
                }
        };
}