<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="fill_parent"

     android:layout_height="fill_parent"

     android:paddingBottom="@dimen/activity_vertical_margin"

     android:paddingLeft="@dimen/activity_horizontal_margin"

     android:paddingRight="@dimen/activity_horizontal_margin"

     android:paddingTop="@dimen/activity_vertical_margin"

     tools:context=".MainActivity" >

     <TextView

         android:id="@+id/text"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text="带有进度条的Button" />

     <RelativeLayout

         android:layout_width="fill_parent"

         android:layout_height="50dp"

         android:layout_centerHorizontal="true"

         android:layout_centerVertical="true"

         android:gravity="bottom" >

         <ProgressBar

             android:id="@+id/progressBar"

             style="?android:attr/progressBarStyleHorizontal"

             android:layout_width="fill_parent"

             android:layout_height="fill_parent"

             android:background="@drawable/aa_button_gray_normal"

             android:max="100"

             android:progress="0"

             android:progressDrawable="@drawable/progress_selector" />

         <Button

             android:id="@+id/downLoadBtn"

             android:layout_width="fill_parent"

             android:layout_height="fill_parent"

             android:layout_centerHorizontal="true"

             android:layout_centerVertical="true"

             android:background="@drawable/btn_selector"

             android:text="下载" />

     </RelativeLayout>

 </RelativeLayout>

 package com.example.buttondemo;

 import android.app.Activity;

 import android.os.Bundle;

 import android.os.Handler;

 import android.os.Message;

 import android.view.View;

 import android.widget.Button;

 import android.widget.ProgressBar;

 import android.widget.TextView;

 public class MainActivity extends Activity {

     int i = 0;

     ProgressBar progressBar = null;

     Button downLoadBtn = null;

     Handler handler = new Handler() {

         public void handleMessage(android.os.Message msg) {

             switch (msg.what) {

             case 1:

                 i += 5;

                 progressBar.setProgress(i);

                 if (i != 100) {

                     handler.sendEmptyMessageDelayed(new Message().what = 1, 500);

                     downLoadBtn.setText(i + "%");

                 } else if (i == 100) {

                     downLoadBtn.setText("下载完成");

                     // 进度条运行完成时按钮可用

                     downLoadBtn.setEnabled(true);

                 }

                 break;

             default:

                 break;

             }

         };

     };

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         TextView tx = (TextView) findViewById(R.id.text);

         progressBar = (ProgressBar) findViewById(R.id.progressBar);

         downLoadBtn = (Button) findViewById(R.id.downLoadBtn);

         downLoadBtn.setOnClickListener(new View.OnClickListener() {

             @Override

             public void onClick(View v) {

                 i = 0;

                 handler.sendEmptyMessage(new Message().what = 1);

                 // 进度条运行时按钮不可用

                 downLoadBtn.setEnabled(false);

             }

         });

     }

 }