android_studio的自定义View的圆形进度条

**需要 考试第三方**
**MyView写法如下**
package com.bawei.lss_yuan;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import java.util.Timer;
import java.util.TimerTask;

public class MyView extends View{

private float cx;
private float cy;
private float radius;
private Paint paint;
private int sweepAngle;
private int color;

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

public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
//获取自定义属性
TypedArray a=context.obtainStyledAttributes(attrs,R.styleable.MyView);
//获取颜色，圆的颜色
color=a.getColor(R.styleable.MyView_circle_color, Color.BLACK);
//圆的半径        radius=a.getDimension(R.styleable.MyView_circle_radius,100);
//圆的距离
cx=a.getDimension(R.styleable.MyView_circle_x,260);
cy=a.getDimension(R.styleable.MyView_circle_y,260);
a.recycle();
paint=new Paint();
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.STROKE);
Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
if(sweepAngle>360){
return;
}
sweepAngle+=1;
postInvalidate();
}
},1000,20);
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
paint.s
4000
etColor(color);
paint.setStrokeWidth(5);
canvas.drawCircle(cx,cy,radius,paint);
//进度条走动颜色
paint.setColor(Color.RED);
RectF rectF=new RectF(cx - radius, cy - radius, cx + radius, cy + radius);
canvas.drawArc(rectF, -90, sweepAngle, false, paint);
int progress= (int) (sweepAngle/360f*100);
paint.setStrokeWidth(0);
//百分数颜色
paint.setColor(Color.BLACK);
paint.setTextSize(15);
canvas.drawText(progress+"%",cx-5,cy,paint);
}
}
**activity_main写法如下**
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">

<com.bawei.lss_yuan.MyView
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
**复制values,attrs.xml的写法如下**
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="MyView">
<attr name="circle_color" format="color"></attr>
<attr name="circle_radius" format="dimension"></attr>
<attr name="circle_x" format="dimension"></attr>
<attr name="circle_y" format="dimension"></attr>

</declare-styleable>
</resources>