开启APP时使用Progress Dialog能否呈现Loading

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 @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.show(); Thread thread=new Thread() { @Override public void run() { super.run();
  //处理程式部份 for(int i=0;i<5;i++) { try { Thread.sleep(1000); } catch (Exception e) { e.printStackTrace(); } }
  handler.post(runnable); } }; thread.start(); } }); }
  private ProgressDialog progressDialog; private Handler handler=new Handler(); private Runnable runnable=new Runnable() { @Override public void run() { progressDialog.dismiss(); } };