android中如何自定义环形统计图动画

package com.freedomanlib;
 
import java.util.Timer;
import java.util.TimerTask;
 
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
 
/**
 * @name 自定义车辆数据统计比重环
 *    1、比重环由底环（灰色）、里程环（红色）、平均速度环（黄色）、行驶时间环（蓝色）、超速次数环（绿色）、环中间评级、指示器组成
 *    ，其中四个数据统计环和底环是同心圆、圆心处有评分文本，圆环外是四个统计指示器。<br>
 *    2、四个统计环是四个弧线，弧度由外界提供数据，并动态显示在界面上。<br>
 *    3、评分等级分为三种：未评分、正在评分、评分完成，当用户点击中间区域时开启评分，评分结束自动停止。<br>
 *    4、外侧对应的四个指示器上结构上包括：指示器位置的小圆圈、折线连接线、指示文本、文本数据显示具体的数值。<br>
 * 
 * @author Freedoman
 * @date 2014-10-27
 */
public class CirStatisticGraph extends View {
 
 private static final String TAG = "CirStatisticGraph";
 
 /**
 * @name CenterPoint
 * @Descripation 中心点<br>
 */
 class CenterPoint {
 float x;
 float y;
 }
 
 /**
 * 边界宽高、中心坐标、外环和内环半径
 */
 private float boundsWidth;
 private float boundsHeigh;
 private CenterPoint centerPoint = new CenterPoint();
 private float radius;
 private float paintWidth;
 private float genPaintWidth;
 
 /**
 * 几种不同的画笔
 */
 private Paint defaultPaint;
 private Paint genPaint;
 private Paint progressTextPaint;
 private Paint flagPaint;
 
 /**
 * 进度
 */
 private int curProgress;
 private int targetProgress = 88;
 private boolean complete;
 
 private int mileage = 128;
 private int averageSpeed = 78;
 private float goTime = 1.5f;
 private int overSpeedCount = 3;
 
 /**
 * 构造
 * 
 * @param context
 */
 public CirStatisticGraph(Context context) {
 this(context, null);
 }
 
 public CirStatisticGraph(Context context, AttributeSet attrs) {
 super(context, attrs, 0);
 }
 
 public CirStatisticGraph(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 this.initialize();
 }
 
 /**
 * 初始化
 */
 private void initialize() {
 
 // 底环画笔
 defaultPaint = new Paint();
 defaultPaint.setColor(Color.argb(0xEE, 0x8E, 0x8E, 0x8E));
 defaultPaint.setStyle(Paint.Style.STROKE);
 defaultPaint.setStrokeWidth(paintWidth);
 defaultPaint.setAntiAlias(true);
 
 // 比重环画笔
 genPaint = new Paint();
 genPaint.setStyle(Paint.Style.STROKE);
 genPaint.setStrokeWidth(genPaintWidth);
 genPaint.setAntiAlias(true);
 
 // 中心进度文本和评级画笔
 progressTextPaint = new Paint();
 progressTextPaint.setColor(Color.WHITE);
 progressTextPaint.setStyle(Paint.Style.STROKE);
 progressTextPaint.setStrokeWidth(0);
 progressTextPaint.setTypeface(Typeface.DEFAULT_BOLD);
 
 // 指示器画笔
 flagPaint = new Paint();
 flagPaint.setColor(Color.WHITE);
 flagPaint.setStyle(Paint.Style.STROKE);
 flagPaint.setStrokeWidth(3);
 flagPaint.setAntiAlias(true);
 }
 
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 
 // 绘制区域的宽高
 boundsWidth = getWidth();
 boundsHeigh = getHeight();
 centerPoint.x = boundsWidth / 2;
 centerPoint.y = boundsHeigh / 2;
 
 radius = boundsHeigh * 1 / 3;
 paintWidth = 50;
 genPaintWidth = paintWidth / 7;
 initialize();
 }
 
 /**
 * 启动进度动画
 */
 public void start() {
 curProgress = 0;
 if (targetProgress == 0) {
 targetProgress = 88;
 }
 final Timer timer = new Timer();
 TimerTask timerTask = new TimerTask() {
 @Override
 public void run() {
 curProgress++;
 if (curProgress == targetProgress) {
  timer.cancel();
 }
 postInvalidate();
 }
 };
 timer.schedule(timerTask, 0, 20);
 }
 
 @SuppressLint("DrawAllocation")
 @Override
 public void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 
 // 底环（灰色）
 canvas.drawCircle(centerPoint.x, centerPoint.y, radius, defaultPaint);
 
 // 很重要的一个半径(最外层环即里程环的半径)
 float sroundRadius = radius + paintWidth / 2 - genPaintWidth / 2;
 
 // 里程比重环（红色）
 genPaint.setColor(Color.argb(0xEE, 0xFF, 0x35, 0x9A));
 RectF oval1 = new RectF(centerPoint.x - sroundRadius, centerPoint.y
 - sroundRadius, centerPoint.x + sroundRadius, centerPoint.y
 + sroundRadius);
 canvas.drawArc(oval1, -90, 300, false, genPaint);
 
 // 里程比重环的指示器位置（勾股定理计算坐标）
 float temp = sroundRadius;
 float relativePoint = (float) Math.sqrt(temp * temp / 2);
 canvas.drawCircle(centerPoint.x - relativePoint, centerPoint.y
 - relativePoint, radius / 12, flagPaint);
 // 连线
 float[] pts1 = new float[8];
 pts1[0] = centerPoint.x - relativePoint - radius / 24;
 pts1[1] = centerPoint.y - relativePoint - radius / 24;
 pts1[2] = centerPoint.x - relativePoint - 80;
 pts1[3] = centerPoint.y - relativePoint - 40;
 
 pts1[4] = pts1[2];
 pts1[5] = pts1[3];
 pts1[6] = pts1[4] - 50;
 pts1[7] = pts1[5];
 canvas.drawLines(pts1, flagPaint);
 
 // 文本
 progressTextPaint.setTextSize(30);
 String txt = "里程";
 float wt = progressTextPaint.measureText(txt);
 canvas.drawText(txt, pts1[6] - wt - 10, pts1[7] + 15, progressTextPaint);
 if (complete) {
 canvas.drawText(mileage + "km", pts1[6] - wt - 10, pts1[7] + 50,
  progressTextPaint);
 }
 
 // 平均速度环（黄色）
 genPaint.setColor(Color.argb(0xEE, 0xF7, 0x50, 0x00));
 RectF oval2 = new RectF(centerPoint.x - sroundRadius + 2
 * genPaintWidth, centerPoint.y - sroundRadius + 2
 * genPaintWidth, centerPoint.x + sroundRadius - 2
 * genPaintWidth, centerPoint.y + sroundRadius - 2
 * genPaintWidth);
 canvas.drawArc(oval2, 0, 280, false, genPaint);
 
 // 平均速度环的指示器位置
 temp = sroundRadius - 2 * genPaintWidth;
 relativePoint = (float) Math.sqrt(temp * temp / 2);
 canvas.drawCircle(centerPoint.x + relativePoint, centerPoint.y
 - relativePoint, radius / 12, flagPaint);
 
 // 连接线
 pts1 = new float[8];
 pts1[0] = centerPoint.x + relativePoint + radius / 24;
 pts1[1] = centerPoint.y - relativePoint - radius / 24;
 pts1[2] = centerPoint.x + relativePoint + 80;
 pts1[3] = centerPoint.y - relativePoint - 40;
 
 pts1[4] = pts1[2];
 pts1[5] = pts1[3];
 pts1[6] = pts1[4] + 50;
 pts1[7] = pts1[5];
 canvas.drawLines(pts1, flagPaint);
 
 // 文本
 txt = "平均速度";
 wt = progressTextPaint.measureText(txt);
 canvas.drawText(txt, pts1[6] + 10, pts1[7] + 15, progressTextPaint);
 if (complete) {
 canvas.drawText(averageSpeed + "km/h", pts1[6] + 10, pts1[7] + 50,
  progressTextPaint);
 }
 
 // 行驶时间环（蓝色）和指示
 genPaint.setColor(Color.argb(0xEE, 0x00, 0x72, 0xE3));
 RectF oval3 = new RectF(centerPoint.x - sroundRadius + 4
 * genPaintWidth, centerPoint.y - sroundRadius + 4
 * genPaintWidth, centerPoint.x + sroundRadius - 4
 * genPaintWidth, centerPoint.y + sroundRadius - 4
 * genPaintWidth);
 canvas.drawArc(oval3, 90, 270, false, genPaint);
 
 // 行驶时间环指示器的位置
 temp = sroundRadius - 4 * genPaintWidth;
 relativePoint = (float) Math.sqrt(temp * temp / 2);
 canvas.drawCircle(centerPoint.x - relativePoint, centerPoint.y
 + relativePoint, radius / 12, flagPaint);
 
 // 连接线和文本
 pts1 = new float[8];
 pts1[0] = centerPoint.x - relativePoint - radius / 24;
 pts1[1] = centerPoint.y + relativePoint + radius / 24;
 pts1[2] = centerPoint.x - relativePoint - 80;
 pts1[3] = centerPoint.y + relativePoint + 40;
 
 pts1[4] = pts1[2];
 pts1[5] = pts1[3];
 pts1[6] = pts1[4] - 50;
 pts1[7] = pts1[5];
 canvas.drawLines(pts1, flagPaint);
 
 txt = "行驶时间";
 wt = progressTextPaint.measureText(txt);
 canvas.drawText(txt, pts1[6] - wt - 10, pts1[7] + 15, progressTextPaint);
 if (complete) {
 canvas.drawText(goTime + "h", pts1[6] - wt - 10, pts1[7] - 20,
  progressTextPaint);
 }
 
 // 超速次数环（绿色）
 genPaint.setColor(Color.argb(0xEE, 0x00, 0xEC, 0x00));
 RectF oval4 = new RectF(centerPoint.x - sroundRadius + 6
 * genPaintWidth, centerPoint.y - sroundRadius + 6
 * genPaintWidth, centerPoint.x + sroundRadius - 6
 * genPaintWidth, centerPoint.y + sroundRadius - 6
 * genPaintWidth);
 canvas.drawArc(oval4, 0, 290, false, genPaint);
 
 // 超速次数环指示器的位置
 temp = sroundRadius - 6 * genPaintWidth;
 relativePoint = (float) Math.sqrt(temp * temp / 2);
 canvas.drawCircle(centerPoint.x + relativePoint, centerPoint.y
 + relativePoint, radius / 12, flagPaint);
 
 // 连接线
 pts1 = new float[8];
 pts1[0] = centerPoint.x + relativePoint + radius / 24;
 pts1[1] = centerPoint.y + relativePoint + radius / 24;
 pts1[2] = centerPoint.x + relativePoint + 80;
 pts1[3] = centerPoint.y + relativePoint + 40;
 
 pts1[4] = pts1[2];
 pts1[5] = pts1[3];
 pts1[6] = pts1[4] + 50;
 pts1[7] = pts1[5];
 canvas.drawLines(pts1, flagPaint);
 
 // 文本
 txt = "超速次数";
 wt = progressTextPaint.measureText(txt);
 canvas.drawText(txt, pts1[6] + 10, pts1[7] + 15, progressTextPaint);
 if (complete) {
 canvas.drawText(overSpeedCount + "次", pts1[6] + 10, pts1[7] - 20,
  progressTextPaint);
 }
 
 // 环中心进度文本（动态迭加的）
 int curPercent = curProgress;
 progressTextPaint.setTextSize(60);
 float ww = progressTextPaint.measureText(curPercent + "%");
 canvas.drawText(curPercent + "%", centerPoint.x - ww / 2,
 centerPoint.y, progressTextPaint);
 
 // 评级提示
 progressTextPaint.setTextSize(25);
 float w = 0;
 String text = "";
 if (curPercent == 0) {
 // 暂未评级
 text = "暂未评级";
 w = progressTextPaint.measureText(text);
 complete = false;
 } else if (curPercent < targetProgress) {
 // 评级中...
 text = "评级中...";
 w = progressTextPaint.measureText(text);
 } else if (curPercent == targetProgress) {
 // 评级完成
 text = "评级完成";
 w = progressTextPaint.measureText(text);
 complete = true;
 postInvalidate();
 }
 canvas.drawText(text, centerPoint.x - w / 2, centerPoint.y + 40,
 progressTextPaint);
 
 }
 
 /**
 * 点击评分区域，进行评分
 * 
 * @param event
 * @return
 */
 @Override
 public boolean onTouchEvent(MotionEvent event) {
 
 float x = event.getX();
 float y = event.getY();
 
 if (x > centerPoint.x - radius && x < centerPoint.x + radius
 && y > centerPoint.y - radius && y < centerPoint.y + radius) {
 Log.i(TAG, ">>>");
 start();
 }
 return super.onTouchEvent(event);
 }
 
}