Android展示“正在加载，请稍后.”

如何实现点击按钮，弹出“正在加载数据，请稍候...”对话框，加载完了之后，对话框自动消失呢？

其实也是很简单的看下面代码：

import com.farsunset.ichat.example.R;import android.os.Bundle;import android.app.Activity;import android.app.ProgressDialog;public class DateReportActivity extends Activity {	private ProgressDialog progressDialog;			@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_date_report);		showProgressDialog("提示", "正在加载......");	}	/*	 * 提示加载	 */	public void showProgressDialog(String title, String message) {		if (progressDialog == null) {			progressDialog = ProgressDialog.show(DateReportActivity.this, title,					message, true, false);		} else if (progressDialog.isShowing()) {			progressDialog.setTitle(title);			progressDialog.setMessage(message);		}		progressDialog.show();	}	/*	 * 隐藏提示加载	 */	public void hideProgressDialog() {		if (progressDialog != null && progressDialog.isShowing()) {			progressDialog.dismiss();		}	}}