<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<Button 
android:id="@+id/mybut"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查找网络"/>
</LinearLayout>

package com.example.progressdialog;
import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
private Button but=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.but=(Button) super.findViewById(R.id.mybut);
this.but.setOnClickListener(new OnClickListenerImp());
}
public class OnClickListenerImp implements OnClickListener{
public void onClick(View v) {
//创建我们的进度条
final ProgressDialog proDia=new ProgressDialog(MainActivity.this);
proDia.setTitle("搜索网络");
proDia.setMessage("请耐心等待");
proDia.onStart();
//匿名内部类
new Thread(){
public void run(){
try{
Thread.sleep(3000);
}
catch(Exception e){
}
finally{
//匿名内部类要访问类当中的数据，该数据必须为final
proDia.dismiss();//隐藏对话框
}
}
}.start();
proDia.show();
}
}
}