package com.wang.avi.indicators;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.view.animation.LinearInterpolator;
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import android.animation.ValueAnimator;
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import com.wang.avi.Indicator;
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import java.util.ArrayList;
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/**
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* Created by Jack on 2015/10/19.
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*/
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public class BallScaleIndicator extends Indicator {
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float scale=1;
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int alpha=255;
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@Override
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public void draw(Canvas canvas, Paint paint) {
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float circleSpacing=4;
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paint.setAlpha(alpha);
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canvas.scale(scale,scale,getWidth()/2,getHeight()/2);
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paint.setAlpha(alpha);
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canvas.drawCircle(getWidth()/2,getHeight()/2,getWidth()/2-circleSpacing,paint);
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}
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@Override
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public ArrayList<ValueAnimator> onCreateAnimators() {
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ArrayList<ValueAnimator> animators=new ArrayList<>();
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ValueAnimator scaleAnim=ValueAnimator.ofFloat(0,1);
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scaleAnim.setInterpolator(new LinearInterpolator());
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scaleAnim.setDuration(1000);
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scaleAnim.setRepeatCount(-1);
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addUpdateListener(scaleAnim,new ValueAnimator.AnimatorUpdateListener() {
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@Override
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public void onAnimationUpdate(ValueAnimator animation) {
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scale = (float) animation.getAnimatedValue();
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postInvalidate();
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}
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});
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ValueAnimator alphaAnim=ValueAnimator.ofInt(255, 0);
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alphaAnim.setInterpolator(new LinearInterpolator());
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alphaAnim.setDuration(1000);
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alphaAnim.setRepeatCount(-1);
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addUpdateListener(alphaAnim,new ValueAnimator.AnimatorUpdateListener() {
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@Override
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public void onAnimationUpdate(ValueAnimator animation) {
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alpha = (int) animation.getAnimatedValue();
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postInvalidate();
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}
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});
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animators.add(scaleAnim);
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animators.add(alphaAnim);
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return animators;
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}
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}
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