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="100"
       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 = 1; i <= 100; i+=1) {
                    Message mg = new Message();
                    mg.what = i;
                    hd.sendMessage(mg);
                    try {
                        Thread.sleep(1000);
                    } 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()*100);
    //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(24);
    //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)/2-fmt.bottom);
    //进行绘制
  cv.drawText(tip, this.getWidth()/2, this.getHeight()/2+h, paint);    
    
}
}

 运行效果：