Android使用自定义View实现饼状图的实例代码

 public class PieChartView extends View { private Paint mPaint; private ListpieDataList; // 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 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

 int values[] = {30, 30, 40}; //右侧的图的数据，{10, 20, 70} 图左 List 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);