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