Android饼状图

项目需要做一个android饼状图的效果因为元素比较多并且有些元素的百分比为0也需要显示出来,一开始考虑使用MPAndroidCharthttps://github.com/PhilJay/MPAndroidChart,毕竟点赞数量多但是看了下效果跟要求差别还是有点大,所以又找了个其他的项目参考PieChartViewhttps://github.com/luweibin3118/PieChartView, 这个项目发现只能设置int类型的百分比而且当条目过多的时候会导致显示的文本覆盖重合之类的所以改了两个地方

1.将int 类型改为float类型百分比

2.将百分比显示由标注线下面移动到 content后面

下面贴下代码和效果

源代码可以去项目里面找我只放下修改后的代码

import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathMeasure;
import android.graphics.Point;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.LinearInterpolator;import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
public class MyPieChartView extends View{private Paint mPaint;private Path mPath, drawLinePath = new Path();private PathMeasure mPathMeasure = new PathMeasure();private Canvas mCanvas;private int width, height;private RectF pieRectF, tempRectF;private int radius;private List<MyPieChartView.ItemType> itemTypeList, leftTypeList, rightTypeList;private List<Point> itemPoints;private int cell = 0;private float innerRadius = 0.0f;private float offRadius = 0, offLine;private int textAlpha;private Point firstPoint;private int backGroundColor = 0xffffffff;private int itemTextSize = 30, textPadding = 8;private int defaultStartAngle = -90;private float pieCell;private ValueAnimator animator;private long animDuration = 1000;private Point startPoint = new Point();private Point centerPoint = new Point();private Point endPoint = new Point();private Point tempPoint = new Point();public MyPieChartView(Context context) {super(context);init();}public MyPieChartView(Context context, AttributeSet attrs) {super(context, attrs);init();}private void init() {mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);mPath = new Path();pieRectF = new RectF();tempRectF = new RectF();itemTypeList = new ArrayList<>();leftTypeList = new ArrayList<>();rightTypeList = new ArrayList<>();itemPoints = new ArrayList<>();}@Overrideprotected void onAttachedToWindow() {super.onAttachedToWindow();startAnim();}@Overrideprotected void onDetachedFromWindow() {super.onDetachedFromWindow();if (animator != null) {animator.cancel();}}private void startAnim() {animator = ValueAnimator.ofFloat(0, 360f * 2);animator.setDuration(animDuration);animator.setInterpolator(new LinearInterpolator());animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {float value = (float) animation.getAnimatedValue();if (value < 360f) {offRadius = value;offLine = 0;textAlpha = 0;} else if (value >= 360f) {offRadius = 360f;offLine = (value - 360f) / 360f;if (offLine > 0.5f) {textAlpha = (int) (255 * ((offLine - 0.5f) / 0.5f));if (textAlpha > 255) textAlpha = 255;} else {textAlpha = 0;}} else if (value == 360f * 2) {offRadius = 360f;offLine = 1.0f;textAlpha = 255;}postInvalidate();}});animator.start();}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);this.width = w;this.height = h;radius = Math.min(width, height) / 4;pieRectF.set(width / 2 - radius, height / 2 - radius, width / 2 + radius, height / 2 + radius);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);try {mCanvas = canvas;drawPie();if (offRadius == 360f) {drawTitle();}} catch (Exception e) {e.printStackTrace();}}private void drawTitle() {resetPaint();float startRadius = defaultStartAngle;int count = rightTypeList.size();int h;if (count > 1) {h = (radius * 2) / (count - 1);} else {h = radius;}for (int i = 0; i < count; i++) {mPath.reset();MyPieChartView.ItemType itemType = rightTypeList.get(i);double angle = 2 * Math.PI * ((startRadius + itemType.radius / 2) / 360d);int x = (int) (width / 2 + radius * Math.cos(angle));int y = (int) (height / 2 + radius * Math.sin(angle));startPoint.set(x, y);centerPoint.set((int) (width / 2 + radius * 1.2f), height / 2 - radius + h * (i));endPoint.set((int) (width * 0.98f), centerPoint.y);mPath.moveTo(startPoint.x, startPoint.y);mPath.lineTo(centerPoint.x, centerPoint.y);mPath.lineTo(endPoint.x, endPoint.y);resetPaint();mPaint.setStrokeWidth(2);mPaint.setColor(itemType.color);mPaint.setStyle(Paint.Style.STROKE);mPathMeasure.setPath(mPath, false);drawLinePath.reset();mPathMeasure.getSegment(0, mPathMeasure.getLength() * offLine, drawLinePath, true);mCanvas.drawPath(drawLinePath, mPaint);startRadius += itemType.radius;if (textAlpha > 0) {mPaint.setTextSize(itemTextSize);mPaint.setStyle(Paint.Style.FILL);mPaint.setTextAlign(Paint.Align.CENTER);mPaint.setAlpha(textAlpha);mCanvas.drawText(itemType.type+itemType.getPercent(), centerPoint.x + (endPoint.x - centerPoint.x) / 2,centerPoint.y - textPadding, mPaint);mPaint.setTextSize(itemTextSize * 4 / 5);
//                mCanvas.drawText(itemType.getPercent(), centerPoint.x + (endPoint.x - centerPoint.x) / 2,
//                        centerPoint.y + (itemTextSize + textPadding) * 4 / 5, mPaint);  //itemType.getPercent()移动到itemType.type后面了}}count = leftTypeList.size();if (count > 1) {h = (radius * 2) / (count - 1);} else {h = radius;}for (int i = 0; i < count; i++) {mPath.reset();MyPieChartView.ItemType itemType = leftTypeList.get(i);double angle = 2 * Math.PI * ((startRadius + itemType.radius / 2) / 360d);int x = (int) (width / 2 + radius * Math.cos(angle));int y = (int) (height / 2 + radius * Math.sin(angle));startPoint.set(x, y);centerPoint.set((int) (width / 2 - radius * 1.2f), height / 2 - radius + h * (count - 1 - i));endPoint.set((int) (width * 0.02f), centerPoint.y);mPath.moveTo(startPoint.x, startPoint.y);mPath.lineTo(centerPoint.x, centerPoint.y);mPath.lineTo(endPoint.x, endPoint.y);resetPaint();mPaint.setStrokeWidth(2);mPaint.setColor(itemType.color);mPaint.setAntiAlias(true);mPaint.setDither(true);mPaint.setStyle(Paint.Style.STROKE);mPathMeasure.setPath(mPath, false);drawLinePath.reset();mPathMeasure.getSegment(0, mPathMeasure.getLength() * offLine, drawLinePath, true);mCanvas.drawPath(drawLinePath, mPaint);startRadius += itemType.radius;if (textAlpha > 0) {mPaint.setTextSize(itemTextSize);mPaint.setStyle(Paint.Style.FILL);mPaint.setTextAlign(Paint.Align.CENTER);mPaint.setAlpha(textAlpha);mCanvas.drawText(itemType.type+itemType.getPercent(), centerPoint.x + (endPoint.x - centerPoint.x) / 2,centerPoint.y - textPadding, mPaint);mPaint.setTextSize(itemTextSize * 4 / 5);
//                mCanvas.drawText(itemType.getPercent(), centerPoint.x + (endPoint.x - centerPoint.x) / 2,
//                        centerPoint.y + (itemTextSize + textPadding) * 4 / 5, mPaint);}}if (textAlpha == 1f) {itemTypeList.clear();leftTypeList.clear();rightTypeList.clear();itemPoints.clear();}}private void drawPie() {if (mCanvas == null) {return;}mCanvas.drawColor(backGroundColor);mPaint.setStyle(Paint.Style.FILL);float sum = 0;for (MyPieChartView.ItemType itemType : itemTypeList) {sum += itemType.widget;}float a = 360f / sum;float startRadius = defaultStartAngle;float sumRadius = 0;leftTypeList.clear();rightTypeList.clear();itemPoints.clear();for (MyPieChartView.ItemType itemType : itemTypeList) {itemType.radius = itemType.widget * a;double al = 2 * Math.PI * ((startRadius + 90) / 360d);tempPoint.set((int) (width / 2 + radius * Math.sin(al)),(int) (height / 2 - radius * Math.cos(al)));if (cell > 0) {if (startRadius == defaultStartAngle) {firstPoint = tempPoint;}}double angle = 2 * Math.PI * ((startRadius + itemType.radius / 2) / 360d);double sin = -Math.sin(angle);double cos = -Math.cos(angle);if (cos > 0) {leftTypeList.add(itemType);} else {rightTypeList.add(itemType);}sumRadius += Math.abs(itemType.radius);mPaint.setStyle(Paint.Style.FILL);mPaint.setColor(itemType.color);if (pieCell > 0) {if (sumRadius <= offRadius) {tempRectF.set(pieRectF.left - (float) (pieCell * cos), pieRectF.top - (float) (pieCell * sin),pieRectF.right - (float) (pieCell * cos), pieRectF.bottom - (float) (pieCell * sin));mCanvas.drawArc(tempRectF, startRadius, itemType.radius, true, mPaint);} else {mCanvas.drawArc(tempRectF, startRadius, itemType.radius - (Math.abs(offRadius - sumRadius)), true, mPaint);break;}} else {if (sumRadius <= offRadius) {mCanvas.drawArc(pieRectF, startRadius, itemType.radius, true, mPaint);} else {mCanvas.drawArc(pieRectF, startRadius, itemType.radius - (Math.abs(offRadius - sumRadius)), true, mPaint);break;}}startRadius += itemType.radius;if (cell > 0 && pieCell == 0) {mPaint.setColor(backGroundColor);mPaint.setStrokeWidth(cell);mCanvas.drawLine(getWidth() / 2, getHeight() / 2, tempPoint.x, tempPoint.y, mPaint);}}if (cell > 0 && firstPoint != null && pieCell == 0) {mPaint.setColor(backGroundColor);mPaint.setStrokeWidth(cell);mCanvas.drawLine(getWidth() / 2, getHeight() / 2, firstPoint.x, firstPoint.y, mPaint);}mPaint.setStyle(Paint.Style.FILL);mPaint.setColor(backGroundColor);if (innerRadius > 0 && pieCell == 0) {mCanvas.drawCircle(width / 2, height / 2, radius * innerRadius, mPaint);}}public void resetPaint() {mPaint.reset();mPaint.setAntiAlias(true);mPaint.setDither(true);mPaint.setAlpha(255);}/*** 添加一条分类数据** @param itemType*/public void addItemType(MyPieChartView.ItemType itemType) {if (itemTypeList != null) {itemTypeList.add(itemType);}}/*** 设置每条图之间的间歇大小** @param cell*/public void setCell(int cell) {this.cell = cell;}/*** 设置内部圆的半径比例，eg：0.5f** @param innerRadius*/public void setInnerRadius(float innerRadius) {if (innerRadius > 1.0f) {innerRadius = 1.0f;} else if (innerRadius < 0) {innerRadius = 0;}this.innerRadius = innerRadius;}/*** 设置背景颜色** @param backGroundColor*/public void setBackGroundColor(int backGroundColor) {this.backGroundColor = backGroundColor;}/*** 设置每条字体大小** @param itemTextSize*/public void setItemTextSize(int itemTextSize) {this.itemTextSize = itemTextSize;}/*** 设置字体距离横线的padding值** @param textPadding*/public void setTextPadding(int textPadding) {this.textPadding = textPadding;}/*** 设置动画时间** @param animDuration*/public void setAnimDuration(long animDuration) {this.animDuration = animDuration;}/*** 代替方法{@link #setCell(int)}** @param pieCell*/@Deprecatedpublic void setPieCell(int pieCell) {this.cell = pieCell;}public static class ItemType {private static final DecimalFormat df = new DecimalFormat("0.0%");String type;float widget;int color;float radius;public ItemType(String type, float widget, int color) {this.type = type;this.widget = widget;this.color = color;}public String getPercent() {return df.format(radius / 360f);}}
}

布局文件:

   <com.runjiang.cityplatform.widget.MyPieChartViewandroid:id="@+id/piechart"android:layout_width="match_parent"android:layout_height="300dp"/>

使用方法很简单:

pieChartView.addItemType(new PieChartView.ItemType("小米", 13, 0xff8B5A00));

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Android饼状图

布局文件:

使用方法很简单:

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