文章标题 圆形进度条（内部显示百分数）

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>