Android自定义带动画效果的圆形ProgressBar

package com.example.fwc.allexample.progressbar;

import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.animation.DecelerateInterpolator;

import com.example.fwc.allexample.R;

/**
 * Created by fwc on 2016/7/6.
 */
public class CircleProgressBar extends View {
  private Context mContext;
  private Paint mPaint;
  private int mProgress = 0;
  private static int MAX_PROGRESS = 100;
  /**
   * 弧度
   */
  private int mAngle;
  /**
   * 中间的文字
   */
  private String mText;
  /**
   * 外圆颜色
   */
  private int outRoundColor;
  /**
   * 内圆的颜色
   */
  private int inRoundColor;
  /**
   * 线的宽度
   */
  private int roundWidth;
  private int style;
  /**
   * 字体颜色
   */
  private int textColor;
  /**
   * 字体大小
   */
  private float textSize;
  /**
   * 字体是否加粗
   */
  private boolean isBold;

  /**
   * 进度条颜色
   */
  private int progressBarColor;

  public CircleProgressBar(Context context) {
    this(context, null);
  }

  public CircleProgressBar(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }

  public CircleProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    mContext = context;
    init(attrs);
  }

  @TargetApi(21)
  public CircleProgressBar(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    mContext = context;
    init(attrs);
  }

  /**
   * 解析自定义属性
   *
   * @param attrs
   */
  public void init(AttributeSet attrs) {
    mPaint = new Paint();
    TypedArray typedArray = mContext.obtainStyledAttributes(attrs, R.styleable.CircleProgressBar);
    outRoundColor = typedArray.getColor(R.styleable.CircleProgressBar_outCircleColor, getResources().getColor(R.color.colorPrimary));
    inRoundColor = typedArray.getColor(R.styleable.CircleProgressBar_inCircleColor, getResources().getColor(R.color.colorPrimaryDark));
    progressBarColor = typedArray.getColor(R.styleable.CircleProgressBar_progressColor, getResources().getColor(R.color.colorAccent));
    isBold = typedArray.getBoolean(R.styleable.CircleProgressBar_textBold, false);
    textColor = typedArray.getColor(R.styleable.CircleProgressBar_textColor, Color.BLACK);
    roundWidth = typedArray.getDimensionPixelOffset(R.styleable.CircleProgressBar_lineWidth, 20);
    typedArray.recycle();
  }

  @Override
  protected void onDraw(Canvas canvas) {
    /**
     * 画外圆
     */
    super.onDraw(canvas);
    int center = getWidth() / 2;        //圆心
    int radius = (center - roundWidth / 2);  //半径
    mPaint.setColor(outRoundColor);      //外圆颜色
    mPaint.setStrokeWidth(roundWidth);     //线的宽度
    mPaint.setStyle(Paint.Style.STROKE);    //空心圆
    mPaint.setAntiAlias(true);        //消除锯齿
    canvas.drawCircle(center, center, radius, mPaint);
    //内圆
    mPaint.setColor(inRoundColor);
    radius = radius - roundWidth;
    canvas.drawCircle(center, center, radius, mPaint);

    //画进度是一个弧线
    mPaint.setColor(progressBarColor);
    RectF rectF = new RectF(center - radius, center - radius, center   radius, center   radius);//圆弧范围的外接矩形
    canvas.drawArc(rectF, -90, mAngle, false, mPaint);
    canvas.save(); //平移画布之前保存之前画的

    //画进度终点的小球,旋转画布的方式实现
    mPaint.setStyle(Paint.Style.FILL);
    //将画布坐标原点移动至圆心
    canvas.translate(center, center);
    //旋转和进度相同的角度，因为进度是从-90度开始的所以-90度
    canvas.rotate(mAngle - 90);
    //同理从圆心出发直接将原点平移至要画小球的位置
    canvas.translate(radius, 0);
    canvas.drawCircle(0, 0, roundWidth, mPaint);
    //画完之后恢复画布坐标
    canvas.restore();

    //画文字将坐标平移至圆心
    canvas.translate(center, center);
    mPaint.setStrokeWidth(0);
    mPaint.setColor(textColor);
    if (isBold) {
      //字体加粗
      mPaint.setTypeface(Typeface.DEFAULT_BOLD);
    }
    if (TextUtils.isEmpty(mText)) {
      mText = mProgress   "%";
    }
    //动态设置文字长为圆半径，计算字体大小
    float textLength = mText.length();
    textSize = radius / textLength;
    mPaint.setTextSize(textSize);
    //将文字画到中间
    float textWidth = mPaint.measureText(mText);
    canvas.drawText(mText, -textWidth / 2, textSize / 2, mPaint);
  }


  public int getmProgress() {
    return mProgress;
  }

  /**
   * 设置进度
   *
   * @return
   */
  public void setmProgress(int p) {
    if (p > MAX_PROGRESS) {
      mProgress = MAX_PROGRESS;
      mAngle = 360;
    } else {
      mProgress = p;
      mAngle = 360 * p / MAX_PROGRESS;
    }
  }


  public String getmText() {
    return mText;
  }

  /**
   * 设置文本
   *
   * @param mText
   */
  public void setmText(String mText) {
    this.mText = mText;
  }

  /**
   * 设置带动画的进度
   * @param p
   */
  public void setAnimProgress(int p) {
    if (p > MAX_PROGRESS) {
      mProgress = MAX_PROGRESS;
    } else {
      mProgress = p;
    }
    //设置属性动画
    ValueAnimator valueAnimator = new ValueAnimator().ofInt(0, p);
    //动画从快到慢
    valueAnimator.setInterpolator(new DecelerateInterpolator());
    valueAnimator.setDuration(3000);
    //监听值的变化
    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
        int currentV = (Integer) animation.getAnimatedValue();
        Log.e("fwc", "current"   currentV);
        mAngle = 360 * currentV / MAX_PROGRESS;
        mText = currentV   "%";
        invalidate();
      }
    });
    valueAnimator.start();
  }
}

<declare-styleable name="CircleProgressBar">
    <attr name="outCircleColor" format="color"></attr>
    <attr name="inCircleColor" format="color"></attr>
    <attr name="progressColor" format="color"></attr>
    <attr name="textColor" format="color"></attr>
    <attr name="textBold" format="boolean"></attr>
    <attr name="lineWidth" format="dimension"></attr>
</declare-styleable>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  xmlns:my="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context="com.example.fwc.allexample.progressbar.ProgressActivtiy">
<com.example.fwc.allexample.progressbar.CircleProgressBar
  android:id="@ id/progress_bar"
  android:layout_centerInParent="true"
  android:layout_width="150dp"
  android:layout_height="150dp"
  my:inCircleColor="#DCDCDC"
  my:outCircleColor="#F0F0F0"
  my:progressColor="#50CE7B"
  my:textBold="true"
  my:textColor="#50CE7B"
  my:lineWidth="5dp"
  />
</RelativeLayout>

package com.example.fwc.allexample.progressbar;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.example.fwc.allexample.R;

public class ProgressActivtiy extends AppCompatActivity {
  CircleProgressBar circleProgressBar;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_progress_activtiy);
    circleProgressBar = (CircleProgressBar)findViewById(R.id.progress_bar);
    circleProgressBar.setProgress(65);
    circleProgressBar.setmText(circleProgressBar.getProgress() "%");
  }
}

/**
   * 设置带动画的进度
   * @param p
   */
  public void setAnimProgress(int p) {
    if (p > MAX_PROGRESS) {
      mProgress = MAX_PROGRESS;
    } else {
      mProgress = p;
    }
    //设置属性动画
    ValueAnimator valueAnimator = new ValueAnimator().ofInt(0, p);
    //动画从快到慢
    valueAnimator.setInterpolator(new DecelerateInterpolator());
    valueAnimator.setDuration(3000);
    //监听值的变化
    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
        int currentV = (Integer) animation.getAnimatedValue();
        Log.e("fwc", "current"   currentV);
        mAngle = 360 * currentV / MAX_PROGRESS;
        mText = currentV   "%";
        invalidate();
      }
    });
    valueAnimator.start();
  }

circleProgressBar.setAnimProgress(65);