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;
}
}