android仿直播圆点加载效果

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <declare-styleable name="CirclePointLoadView">
    <attr name="leftPointColor" format="color|reference"></attr>
    <attr name="middlePointColor" format="color|reference"></attr>
    <attr name="rightPointColor" format="color|reference"></attr>
    <attr name="radius" format="integer|reference"></attr>
    <attr name="translationDistance" format="dimension|reference"></attr>
  </declare-styleable>
</resources>

package com.circle.load;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
/**
 * Created by zhouguizhijxhz on 2018/5/29.
 */
public class CircleItemPointView extends View {
  private Paint mPaint;
  private int mColor;
  public CircleItemPointView(Context context) {
    this(context,null);
  }

  public CircleItemPointView(Context context, @Nullable AttributeSet attrs) {
    this(context, attrs,0);
  }

  public CircleItemPointView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setDither(true);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    int cx = getWidth()/2;
    int cy = getHeight()/2;
    canvas.drawCircle(cx,cy,cx,mPaint);
  }
  /**
   * 切换颜色
   */
  public void changeColor(int color){
    mColor = color;
    mPaint.setColor(color);
    invalidate();
  }
  public void setColor(int color){
    mColor = color;
    mPaint.setColor(color);
    invalidate();
  }
  /**
   * 获取当前的颜色
   */
  public int getColor() {
    return mColor;
  }
}

package com.circle.load;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.widget.RelativeLayout;
/**
 * Created by zhouguizhijxhz on 2018/5/29.
 */
public class CirclePointLoadView extends RelativeLayout{
  private int defaultLeftColor = Color.parseColor("#FF8247");
  private int defaultMiddleColor = Color.parseColor("#EE4000");
  private int defaultRightColor = Color.parseColor("#CD2626");
  private int leftColor;
  private int middleColor;
  private int rightColor;
  private int defaultCircleRadius = 10;
  private int defaultTranslationDistance = 36;
  private int translationDistance;
  private static final long ANIMATION_DURATION = 400;
  private int radius;
  private CircleItemPointView leftView;
  private CircleItemPointView middleView;
  private CircleItemPointView rightView;
  private AnimatorSet spreadAnimation;
  private AnimatorSet closedAnimation;
  public CirclePointLoadView(Context context) {
    this(context,null);
  }
  public CirclePointLoadView(Context context, AttributeSet attrs) {
    this(context, attrs,0);
  }
  public CirclePointLoadView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    parseAttrs(context,attrs);
    addViewToLayout(context);
  }

  private void addViewToLayout(Context context) {
    if(null==context){
      return;
    }
    leftView = createView(context);
    leftView.setColor(leftColor);
    middleView = createView(context);
    middleView.setColor(middleColor);
    rightView = createView(context);
    rightView.setColor(rightColor);
    addView(leftView);
    addView(rightView);
    addView(middleView);
  }
  /**
   * 展开动画
   */
  private void spreadAnimation() {
    ObjectAnimator leftTranslationAnimator = ObjectAnimator.ofFloat(leftView,"translationX",0,-translationDistance);
    ObjectAnimator rightTranslationAnimator = ObjectAnimator.ofFloat(rightView,"translationX",0,translationDistance);
    spreadAnimation = new AnimatorSet();
    spreadAnimation.setDuration(ANIMATION_DURATION);
    spreadAnimation.playTogether(leftTranslationAnimator,rightTranslationAnimator);
    spreadAnimation.addListener(new AnimatorListenerAdapter() {
      @Override
      public void onAnimationEnd(Animator animation) {
        closedAnimation();
      }
    });
    spreadAnimation.start();
  }

  private void closedAnimation() {
    ObjectAnimator leftTranslationAnimator = ObjectAnimator.ofFloat(leftView,"translationX",-translationDistance,0);
    ObjectAnimator rightTranslationAnimator = ObjectAnimator.ofFloat(rightView,"translationX",translationDistance,0);
    closedAnimation = new AnimatorSet();
    closedAnimation.setInterpolator(new AccelerateInterpolator());
    closedAnimation.setDuration(ANIMATION_DURATION);
    closedAnimation.playTogether(leftTranslationAnimator,rightTranslationAnimator);
    closedAnimation.addListener(new AnimatorListenerAdapter() {
      @Override
      public void onAnimationEnd(Animator animation) {
        int leftColor = leftView.getColor();
        int rightColor = rightView.getColor();
        int middleColor = middleView.getColor();
        middleView.changeColor(leftColor);
        rightView.changeColor(middleColor);
        leftView.changeColor(rightColor);
        spreadAnimation();
      }
    });
    closedAnimation.start();
  }
  public CircleItemPointView createView(Context context) {
    CircleItemPointView itemPointView = new CircleItemPointView(context);
    LayoutParams params = new LayoutParams(DensityUtils.dp2px(context,radius),DensityUtils.dp2px(context,radius));
    params.addRule(CENTER_IN_PARENT);
    itemPointView.setLayoutParams(params);
    return itemPointView;
  }
  private void parseAttrs(Context context, AttributeSet attrs) {
    if(null==context||null==attrs){
      return;
    }
    TypedArray typedArray = context.obtainStyledAttributes(attrs,R.styleable.CirclePointLoadView);
    leftColor = typedArray.getColor(R.styleable.CirclePointLoadView_leftPointColor,defaultLeftColor);
    middleColor = typedArray.getColor(R.styleable.CirclePointLoadView_middlePointColor,defaultMiddleColor);
    rightColor = typedArray.getColor(R.styleable.CirclePointLoadView_rightPointColor,defaultRightColor);
    radius = typedArray.getInteger(R.styleable.CirclePointLoadView_radius,defaultCircleRadius);
    translationDistance = (int) typedArray.getDimension(R.styleable.CirclePointLoadView_translationDistance,defaultTranslationDistance);
    translationDistance = DensityUtils.dp2px(context,translationDistance);
    typedArray.recycle();
  }

  /**
   * 开启动画
   */
  public void startLoad(){
    if(spreadAnimation==null){
      spreadAnimation();
    }
  }
  /**
   * 停止动画
   */
  public void stopLoad(){
    clearAnimation();
    leftView.setVisibility(View.GONE);
    middleView.setVisibility(View.GONE);
    rightView.setVisibility(View.GONE);
  }

  /**
   * 设置左侧颜色值
   * @param leftColor
   */
  public void setLeftColor(int leftColor) {
    this.leftColor = leftColor;
  }
  /**
   * 设置中间颜色值
   * @param middleColor
   */
  public void setMiddleColor(int middleColor) {
    this.middleColor = middleColor;
  }
  /**
   * 设置右侧颜色值
   * @param rightColor
   */
  public void setRightColor(int rightColor) {
    this.rightColor = rightColor;
  }
  /**
   * 设置圆的半径
   * @param radius
   */
  public void setRadius(int radius) {
    this.radius = radius;
  }
  /**
   * 设置动画x轴方向移动的距离
   * @param translationDistance
   */
  public void setTranslationDistance(int translationDistance) {
    translationDistance = translationDistance;
  }
}