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;
}
}
}
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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);
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以上所述是小编给大家介绍的Android使用自定义View实现饼状图的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：https://blog.csdn.net/meetings/article/details/78871582