自定义View饼状图

1.效果图

2.代码实现

public class PieChartView extends View {
    private Paint mPaint;
    private List<PieData>pieDataList;
    // 饼状图初始绘制角度
    private float mStartAngle = 0;

    public PieChartView(Context context) {
        this(context, null);
    }

    public PieChartView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public void setData(List<PieData> dataList){
        if (null == dataList || dataList.size() == 0)
            return;
        pieDataList = dataList;

        invalidate(); //触发onDraw
    }

    private void init() {
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setStyle(Paint.Style.FILL);
        mPaint.setStrokeWidth(4);

        rectF = new RectF(100f, 100f, 600f, 600f); //正方形背景
    }

   private RectF rectF;

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (null == pieDataList || pieDataList.size() == 0)
            return;

        float currentAngle = mStartAngle;
        for (int i = 0;i<pieDataList.size();i++){
            PieData pieData = pieDataList.get(i);
            mPaint.setColor(pieData.color);
            canvas.drawArc(rectF,currentAngle,pieData.angle,true,mPaint); //画弧
            currentAngle += pieData.angle;
        }

    }
}

                    int values[] = {30, 30, 40}; //右侧的图的数据，{10, 20, 70} 图左
                    List<PieData> pieDataList = new ArrayList<>();
                    PieData pieData1 = new PieData();
                    pieData1.percentage = (float) values[0] / 100;
                    pieData1.angle = pieData1.percentage * 360;
                    pieData1.color = Color.RED;
                    pieDataList.add(pieData1);

                    PieData pieData2 = new PieData();
                    pieData2.percentage = (float) values[1] / 100;
                    pieData2.angle = pieData2.percentage * 360;
                    pieData2.color = Color.GREEN;
                    pieDataList.add(pieData2);

                    PieData pieData3 = new PieData();
                    pieData3.percentage = (float) values[2] / 100;
                    pieData3.angle = pieData3.percentage * 360;
                    pieData3.color = Color.YELLOW;
                    pieDataList.add(pieData3);


                    PieChartView pieChartView = new PieChartView(mContext);
                    pieChartView.setData(pieDataList);
                    addView(pieChartView);