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.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 BallBeatIndicator extends Indicator {
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public static final float SCALE=1.0f;
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public static final int ALPHA=255;
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private float[] scaleFloats=new float[]{SCALE,
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SCALE,
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SCALE};
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int[] alphas=new int[]{ALPHA,
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ALPHA,
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ALPHA,};
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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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float radius=(getWidth()-circleSpacing*2)/6;
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float x = getWidth()/ 2-(radius*2+circleSpacing);
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float y=getHeight() / 2;
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for (int i = 0; i < 3; i++) {
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canvas.save();
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float translateX=x+(radius*2)*i+circleSpacing*i;
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canvas.translate(translateX, y);
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canvas.scale(scaleFloats[i], scaleFloats[i]);
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paint.setAlpha(alphas[i]);
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canvas.drawCircle(0, 0, radius, paint);
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canvas.restore();
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}
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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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int[] delays=new int[]{350,0,350};
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for (int i = 0; i < 3; i++) {
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final int index=i;
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ValueAnimator scaleAnim=ValueAnimator.ofFloat(1,0.75f,1);
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scaleAnim.setDuration(700);
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scaleAnim.setRepeatCount(-1);
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scaleAnim.setStartDelay(delays[i]);
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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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scaleFloats[index] = (float) animation.getAnimatedValue();
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postInvalidate();
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}
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});
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ValueAnimator alphaAnim=ValueAnimator.ofInt(255,51,255);
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alphaAnim.setDuration(700);
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alphaAnim.setRepeatCount(-1);
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alphaAnim.setStartDelay(delays[i]);
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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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alphas[index] = (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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}
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return animators;
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}
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}
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