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MainActivity如下:

package cc.testprogressdialog;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.widget.FrameLayout;import android.widget.LinearLayout;import android.widget.ProgressBar;import android.app.Activity;import android.app.ProgressDialog;import android.content.Context;/** * Demo描述: * 利用代码在屏幕中间位置显示ProgressDialog和ProgressBar *  * 参考资料: * 1 http://blog.csdn.net/lfdfhl/article/details/18913435 * 2 http://blog.csdn.net/lfdfhl/article/details/9299075 * 3 http://rocye.iteye.com/blog/1258936 *   Thank you very much *    * 如果在某个线性布局中动态添加一个控件,并且想让该控件在布局中居中. * 也可采用createProgressBar()方法中类似的方式 * */public class MainActivity extends Activity {	private Context mContext;	private ProgressBar mProgressBar;    private ProgressDialog mProgressDialog;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		//显示ProgressBar		createProgressBar();		//显示ProgressDialog		//createProgressDialog();	}		private void createProgressBar(){		mContext=this;		//整个Activity布局的最终父布局,参见参考资料		FrameLayout rootFrameLayout=(FrameLayout) findViewById(android.R.id.content);		FrameLayout.LayoutParams layoutParams=	    new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);		layoutParams.gravity=Gravity.CENTER;		mProgressBar=new ProgressBar(mContext);		mProgressBar.setLayoutParams(layoutParams);		mProgressBar.setVisibility(View.VISIBLE);		rootFrameLayout.addView(mProgressBar);	}			private void createProgressDialog(){		mContext=this;		mProgressDialog=new ProgressDialog(mContext);		mProgressDialog.setMessage("...请您稍等...");		mProgressDialog.show();	}}

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