<?xml version="1.0" encoding="utf-8"?>

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

     xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"

     android:layout_width="match_parent" android:layout_height="match_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="com.example.top5.MainActivity">

    <com.example.top5_3.MyProgressBar

        android:id="@+id/pb"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:max=""

        style="@android:style/Widget.ProgressBar.Horizontal"/>

 </RelativeLayout>

 package com.example.top5_3;

 import android.app.Activity;

 import android.os.Handler;

 import android.os.Message;

 import android.os.Bundle;

 import android.view.Menu;

 import android.widget.ProgressBar;

 public class MainActivity extends Activity {

     private MyProgressBar pb;

     Handler hd = new Handler() {

         public void handleMessage(Message msg) {

             pb.setProgress(msg.what);

         }

     };

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         pb =  (MyProgressBar) findViewById(R.id.pb);

         new Thread(new Runnable() {

             @Override

             public void run() {

                 for (int i = ; i <= ; i+=) {

                     Message mg = new Message();

                     mg.what = i;

                     hd.sendMessage(mg);

                     try {

                         Thread.sleep();

                     } catch (InterruptedException e) {

                         e.printStackTrace();

                     }

                 }

             }

         }).start();

     }

     public boolean onCreateOptionsMenu(Menu menu)

     {

         getMenuInflater().inflate(R.menu.main, menu);

         return true;

     }

 }

 package com.example.top5_3;

 import java.text.MessageFormat;

 import android.content.Context;

 import android.graphics.Canvas;

 import android.graphics.Color;

 import android.graphics.Paint;

 import android.graphics.Paint.Align;

 import android.graphics.Paint.FontMetrics;

 import android.util.AttributeSet;

 import android.widget.ProgressBar;

 public class MyProgressBar extends ProgressBar {

 private Paint paint=new Paint();

     public MyProgressBar(Context context) {

         super(context);

         // TODO Auto-generated constructor stub

     }

 public MyProgressBar(Context cont,AttributeSet attrs) {

     // TODO Auto-generated constructor stub

     super(cont,attrs);

 }

 protected synchronized void onDraw(Canvas cv){

     super.onDraw(cv);

     //进度天百分比

     int reta=(int)((double)getProgress()/this.getMax()*);

     //要绘制的文字

     String tip=MessageFormat.format("{0}%",reta);

     //设置文字对齐方式

     paint.setTextAlign(Align.CENTER);

     //设置文字颜色

     paint.setColor(Color.BLUE);

     //设置字体大小

     paint.setTextSize();

     //Canvas绘制文本时，使用 fontMetrics对象，计算坐标位置

     FontMetrics fmt=paint.getFontMetrics();

     int h=(int)((fmt.bottom-fmt.top)/-fmt.bottom);

     //进行绘制

   cv.drawText(tip, this.getWidth()/, this.getHeight()/+h, paint);    

 }

 }