ProgressDialog 切换的问题

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public class ProjectActivity extends Activity { // 存放图片URL用的String阵列

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public class MySource extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main);
  Button button=(Button)findViewById(R.id.button1); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { progressDialog=new ProgressDialog(MySource.this); //progressDialog.setMessage("与资料库连线中"); //progressDialog.show(); myHandler=new MyHandler(); (new Thread() { @Override public void run() { super.run(); Message message=new Message(); message.arg1=0; myHandler.sendMessage(message); try { Thread.sleep(2000); } catch (Exception e) { e.printStackTrace(); } message=new Message(); message.arg1=1; myHandler.sendMessage(message); try { Thread.sleep(2000); } catch (Exception e) { e.printStackTrace(); } message=new Message(); message.arg1=9; myHandler.sendMessage(message); } } ).start(); } }); }
  private ProgressDialog progressDialog;
  private MyHandler myHandler;
  class MyHandler extends Handler { @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch(msg.arg1) { case 0: progressDialog.setMessage("与资料库连线中"); progressDialog.show(); break; case 1: progressDialog.setMessage("图片载入中"); break; case 9: progressDialog.dismiss(); break; } } }
  }