文章标题 圆形进度条（内部显示百分数）

CustomProgrssView控件
package shidongliang.bwei.com.huatudemo.view;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

/**
 * 此类的作用：
 *
 * @author: forever
 * @date: 2017/11/1 15:05
 */
public class CustomProgrssView extends View {
    //定义个画笔

    private int progress=0;
    private boolean runing=true;
    private Paint paint;


    public CustomProgrssView(Context context) {
        super(context);
    }

    public CustomProgrssView(Context context, AttributeSet attrs) {
        super(context, attrs);
      //创建画笔
        paint = new Paint();
        //抗锯齿
        paint.setAntiAlias(true);
        //设置画笔颜色
        paint.setColor(Color.RED);
        //设置画笔 填充是空心
        paint.setStyle(Paint.Style.STROKE);
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (runing){
                    if(progress>=360){
                        runing=false;
                        return;
                    }
                    System.out.println("progrss="+progress);
                    progress+=10;
                    //子线程刷新 系统调用onDraw方法
                    postInvalidate();
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();

    }

    public CustomProgrssView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //获得view的宽和高
        int x=getWidth()/2;
        int y=getHeight()/2;
        int radius=200;
        //设置画笔的粗细
        paint.setStrokeWidth(5);
        //定义区域
        RectF rectF = new RectF(x - radius, y - radius, x + radius, y + radius);
    canvas.drawArc(rectF,-90,progress,false,paint);
        int text=(int) ((float)progress/360*100);
        float textWidth=paint.measureText(text+"%");
        Rect rextText=new Rect();
        paint.getTextBounds(text+"%",0,(text+"%").length(),rextText);
        paint.setTextSize(30);
        paint.setStrokeWidth(1);
        //画文字
        canvas.drawText(text+"%",x-textWidth/2,y+rextText.height()/2,paint);
    }
}
布局-------------------------
<?xml version="1.0" encoding="utf-8"?>
<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="shidongliang.bwei.com.huatudemo.MainActivity">

<shidongliang.bwei.com.huatudemo.view.CustomProgrssView
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
</LinearLayout>