Android使用自定义View实现饼状图的实例代码

这篇文章主要介绍了Android使用自定义View实现饼状图的实例代码，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧

本文讲述了Android使用自定义View实现饼状图的实例代码。分享给大家供大家参考，具体如下：

1.效果图

2.代码实现

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									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; 

									 } 

									 } 

									}

3.使用：

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									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);