根据前面写的 canvas 和paint的一些用法，
现在就把原来写过的项目中的东西的 一些原始基本代码拿出来记录下。很多功能可以自己在基础上添加，
先来张效果图吧。PS: 这里只是简单的思路代码，其实饼图可以点击后实现点击效果
部分代码：
/** * 画饼图类 */@SuppressLint("ViewConstructor")public class PieView extends View { int areaX = 1; int areaY = 22; //饼图的宽高 private int areaWidth = 360; private int areaHight = 300; //颜色数组 private int[] colors =new int[]{ Color.rgb(54,217,169),Color.rgb(0,171,255),Color.rgb(80,195,252),Color.rgb(13,142,207), Color.rgb(2,211,21),Color.rgb(176,222,9),Color.rgb(248,255,1),Color.rgb(252,210,2), Color.rgb(255,159,13),Color.rgb(255,100,0),Color.rgb(234,14,0), }; //阴影数组 private int[] shade_colors = new int[]{ Color.rgb(26,164,123),Color.rgb(0,154,230),Color.rgb(21,178,255),Color.rgb(5,102,153), Color.rgb(3,147,15),Color.rgb(124,158,8),Color.rgb(212,218,2),Color.rgb(219,183,6), Color.rgb(214,135,5),Color.rgb(210,90,13),Color.rgb(199,13,1), }; //区域百分比 private int percent[]; private String title; private int thickness= 20; float x, y; //默认可响应点击事件 private boolean isOntouch= true; //下面的图例文字 private String[] info; //点击事件的计算 private float centerX; private float centerY; private Context context; //图例文字的pain private Paint legendPaint; //饼图的paint private Paint mainPaint; //默认显示右边 private WHERE where = WHERE.right; public static enum WHERE{ right ,bottmo } /** * @param context * @param colors 最上面颜色数组 * @param shade_colors 阴影颜色数组 * @param percent 百分比 (和必须是360) */ public PieView(Context context,int[] percent, String[] info) { super(context); this.percent = percent; this.context = context; this.info = info; initPaint(); } //初始化 画笔 private void initPaint(){ legendPaint = new Paint(); legendPaint.setColor(Color.BLACK); legendPaint.setStrokeWidth(1f); mainPaint = new Paint(); mainPaint.setStyle(Style.FILL); mainPaint.setAntiAlias(true); } //设置饼图的大小 这里已经给了默认大小了 public void setSize(int areaWidth ,int areaHight){ this.areaWidth = areaWidth; this.areaHight = areaHight; } //饼图的标题 public void setTitle(String title){ this.title = title; } public void setWhere(WHERE s){ this.where = s; } public void setThickness(int thickness) { this.thickness = thickness; areaY=thickness+2; this.invalidate(); } // 主要访法 @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //开画 for(int i=0;i <= thickness;i++){ int tempAngle=0; for(int j=0;j< percent.length;j++){ //画笔的颜色 mainPaint.setColor(shade_colors[j]); //坐标点 start end RectF rectF = new RectF(areaX, areaY-i, areaX+areaWidth, areaHight-i); //画弧 canvas.drawArc(rectF, tempAngle,percent[j], true, mainPaint); tempAngle+=percent[j]; } //开始画图例区域 if(i == thickness ){ RectF rectF = new RectF(areaX, areaY- thickness, areaX + areaWidth, areaHight- thickness); centerX = rectF.centerX(); centerY = rectF.centerY(); int temp = areaHight + 20/* height-320*/; for(int j=0;j<percent.length;j++){ mainPaint.setColor(colors[j]); canvas.drawArc(rectF , tempAngle,percent[j], true, mainPaint); tempAngle+=percent[j]; //说明区域 RectF rect = new RectF(areaX, temp, areaX+40, temp-10);//标识区域 canvas.drawText(info[j], areaX+60, temp, legendPaint); canvas.drawRect(rect, mainPaint); temp += 25; } } } // for (int i = 0; i < colors.length; i++) { if (isOntouch) { isOntouch = false; System.out.println(centerX + "" + centerY); double d = Math.atan2(y-centerY, x-centerX)*180/Math.atan2(0.0, -1.0); if (d < 0) { d = 360 + d; } int temp = 0; for (int j = 0; j < percent.length; j++) { Log.e(Float.toString(y), Float.toString(areaHight)); if (d >temp && d < percent[j]+temp && y < areaHight) { System.out.println(" " + colors[j]); // context.startActivity(it); Toast.makeText(context, "colors[j]="+ colors[j] + "----x,y="+ x+","+y +"--temp="+ temp, 1000).show(); } temp += percent[j]; } } } } @Override public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_UP) { isOntouch = true; x = event.getX(); y = event.getY(); invalidate(); } return true; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); }}