Android--ProgressDialog用法

.java代码如下：
package org.lxh.demo;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.app.ProgressDialog;import android.content.DialogInterface;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnFocusChangeListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class Hello extends Activity {public ProgressDialog myDialog = null;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); // 生命周期方法super.setContentView(R.layout.main); // 设置要使用的布局管理器Button btn = new Button(this);this.setContentView(btn);// 全屏幕显示按钮btn.setText("请按下我运行程序...");btn.setOnClickListener(new OnClickListenerImpl());}private class OnClickListenerImpl implements OnClickListener {public void onClick(View arg0) {CharSequence strDialogTitle = "请稍等片刻...";CharSequence strDialogBody = "正在运算中...";myDialog = ProgressDialog.show(Hello.this, strDialogTitle,strDialogBody);new Thread() {@Overridepublic void run() {try {sleep(3000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}myDialog.dismiss();}}.start();}}}
运行效果如下：
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