private BlurMaskFilter PaintBGBlur;
private int ScrHeight; private int ScrWidth; private Paint[] arrPaintArc; private Paint PaintText = null; private Path pathArc = null; private RectF arcRF0 = null; private int[] colors = new int[] { Color.RED, Color.BLUE, }; // 演示用的比例,实际使用中，即为外部传入的比例参数 private int arrPer[] = new int[] { 100, 0 };private String typeText[] = new String[] {"已读","未读"};
private int total = 0;
public ChartContentView(Context context, int[] colors, int[] per, String[] typeText) {
super(context);// 初始化数据
initData(colors, per, typeText); initView(); }
/**
* 初始化页面 */ private void initView() { // 解决4.1版本以下canvas.drawTextOnPath()不显示问题 this.setLayerType(View.LAYER_TYPE_SOFTWARE, null); // 屏幕信息 DisplayMetrics dm = getResources().getDisplayMetrics(); ScrHeight = dm.heightPixels; ScrWidth = dm.widthPixels; // 设置边缘特殊效果 PaintBGBlur = new BlurMaskFilter(1, BlurMaskFilter.Blur.INNER); arrPaintArc = new Paint[colors.length]; for (int i = 0; i < colors.length; i++) { arrPaintArc[i] = new Paint(); arrPaintArc[i].setColor(colors[i]); arrPaintArc[i].setStyle(Paint.Style.FILL); arrPaintArc[i].setStrokeWidth(4); arrPaintArc[i].setMaskFilter(PaintBGBlur); }PaintText = new Paint();
PaintText.setColor(Color.BLACK); PaintText.setTextSize(25); PaintText.setTypeface(Typeface.DEFAULT_BOLD);pathArc = new Path();
arcRF0 = new RectF(); }public void onDraw(Canvas canvas) {
// 画布背景 canvas.drawColor(Color.TRANSPARENT); if (arrPer.length > arrPaintArc.length || arrPer.length > colors.length || arrPer.length > typeText.length || arrPer.length <= 0) { return; } float cirX = ScrWidth / 2; float cirY = ScrHeight / 3; float radius = ScrHeight / 5;float arcLeft = cirX - radius;
float arcTop = cirY - radius; float arcRight = cirX + radius; float arcBottom = cirY + radius; arcRF0.set(arcLeft, arcTop, arcRight, arcBottom); // x,y,半径,CW为顺时针绘制 pathArc.addCircle(cirX, cirY, radius, Direction.CW); // 绘出饼图大轮廓 canvas.drawPath(pathArc, arrPaintArc[0]); float CurrPer = 0f; // 偏移角度 float Percentage = 0f; // 当前所占比例 int scrOffsetW = ScrWidth - 200; int scrOffsetH = ScrHeight - 300; int scrOffsetT = 40;for (int i = 0; i < arrPer.length; i++) {
if (i != 0) { // 将百分比转换为饼图显示角度 Percentage = 360 * ((float) arrPer[i] / (float) total); Percentage = (float) (Math.round(Percentage * 100)) / 100; // 在饼图中显示所占比例 canvas.drawArc(arcRF0, CurrPer, Percentage, true, arrPaintArc[i]); }// 当前颜色
canvas.drawRect(scrOffsetW - 60, scrOffsetH + i * scrOffsetT, scrOffsetW, scrOffsetH - 30 + i * scrOffsetT, arrPaintArc[i]); // 当前比例 canvas.drawText(typeText[i] + String.valueOf(arrPer[i]) + "条", scrOffsetW, scrOffsetH + i * scrOffsetT, PaintText);// 下次的起始角度
CurrPer += Percentage; }}
/**
* 改变数据，刷新画面 * * @param colors * @param per * @param typeText */ public void changeData(int[] colors, int[] per, String[] typeText) { initData(colors, per, typeText); invalidate(); } /** * 初始化数据 * * @param colors * @param per * @param typeText */ private void initData(int[] colors, int[] per, String[] typeText) { if (colors != null && colors.length > 0) { this.colors = colors; } else { this.colors = new int[] {}; } total = 0; if (per != null && per.length > 0) { this.arrPer = per; for (int i = 0; i < per.length; i++) { total += per[i]; } } else { this.arrPer = new int[] {}; } if (typeText != null && typeText.length > 0) { this.typeText = typeText; } else { this.typeText = new String[] {}; } }