Android实现加载时提示“正在加载，请稍后”的方法

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();
  }

 }

}