TOP5_3：定制简单的进度条

结构：

Activity:

 <?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>

JAVA:

MainActivity:

 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;
     }
 
 }

MyProgressBar:

 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);    
 
 }
 }

运行效果：