自定义圆形图片饼状图

首先在value文件夹当中创建attrs.xml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="CircleView">
        <attr name="circleColor" format="color"/>
        <attr name="arcColor" format="color"/>
        <attr name="circleRadius" format="dimension"/>
        <attr name="arcStartAngle" format="integer"/>
        <attr name="arcSweepAngle" format="integer"/>
    </declare-styleable>
</resources>

然后在代码中创建CircleView类

package com.animee.day411;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Build;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
/**
 * Created by Administrator on 2018/3/19.
 */
public class CircleView extends View{

    private Paint circlePaint;
    private Paint pathPaint;
    private int  startAngle,sweepAngle;
    private int radius;
    public CircleView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        initPaint();
        TypedArray typedArray = context.obtainStyledAttributes(attrs,R.styleable.CircleView);
        int arccolor = typedArray.getColor(R.styleable.CircleView_arcColor, Color.GREEN);
        pathPaint.setColor(arccolor);

        int circlecolor = typedArray.getColor(R.styleable.CircleView_circleColor, Color.RED);
        circlePaint.setColor(circlecolor);

        radius = (int) typedArray.getDimension(R.styleable.CircleView_circleRadius, 100);
        startAngle = typedArray.getInt(R.styleable.CircleView_arcStartAngle, 0);
        sweepAngle = typedArray.getInt(R.styleable.CircleView_arcSweepAngle, 90);
        typedArray.recycle();
    }
    /**
     *  初始化画笔
     * */
    private void initPaint() {
        circlePaint = new Paint();
        circlePaint.setStyle(Paint.Style.FILL);
        circlePaint.setAntiAlias(true);

        pathPaint = new Paint();
        pathPaint.setStyle(Paint.Style.FILL);
        pathPaint.setAntiAlias(true);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawCircle(getHeight()/2,getWidth()/2,radius,circlePaint);

        canvas.drawArc(0,0,getWidth(),getHeight(),startAngle,sweepAngle,true,pathPaint);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int hsize = MeasureSpec.getSize(heightMeasureSpec);
        int wsize = MeasureSpec.getSize(widthMeasureSpec);
        int hmode = MeasureSpec.getMode(heightMeasureSpec);
        int wmode = MeasureSpec.getMode(widthMeasureSpec);

        switch (wmode) {
            case MeasureSpec.AT_MOST:
                if (hmode== MeasureSpec.AT_MOST) {
                    int isize = radius * 2;
                    wsize = hsize = isize;
                }else{
                    int isize = radius * 2;
                    int min = Math.min(isize, hsize);
                    wsize = hsize = min;
                }
                break;
            case MeasureSpec.EXACTLY:
                if (hmode== MeasureSpec.AT_MOST) {
                    int isize = radius * 2 + getPaddingLeft() + getPaddingRight();
                    int min = Math.min(isize, wsize);
                    wsize = hsize = min;
                }else{
                    int min = Math.min(wsize, hsize);
                    radius = min/2;
                    wsize = hsize = min;
                }
                break;
        }
        setMeasuredDimension(wsize,hsize);
    }
}

然后在布局中引入这个类文件 circle_test

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp">

    <com.animee.day411.CircleView
        android:id="@+id/cv"
        android:layout_width="200dp"
        android:layout_height="200dp"
        app:circleColor="#FF00F5"
        app:arcColor="#00FFFF"
        app:arcStartAngle="-90"
        app:arcSweepAngle="180"
        app:circleRadius="50dp"/>
</LinearLayout>

然后在grdiview当中使用。