Android开发:进度条对话框

效果一：

效果二：

效果一实现代码：
ProgressDialog MyDialog = ProgressDialog.show( MyActivity.this, " " , " Loading. Please wait ... ", true);

效果二实现代码：
ProgressDialog pbarDialog;
pbarDialog = new ProgressDialog( mContext );
pbarDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pbarDialog.setMessage("Loading...");
pbarDialog.setCancelable(false);