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;                        }                }        };}

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