BallClipRotateMultipleIndicator.java

package com.github.jdsjlzx.progressindicator.indicators;

import android.animation.ValueAnimator;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;

import com.github.jdsjlzx.progressindicator.Indicator;

import java.util.ArrayList;

/**
 * Created by Jack on 2015/10/17.
 */
public class BallClipRotateMultipleIndicator extends Indicator {

    float scaleFloat=1,degrees;


    @Override
    public void draw(Canvas canvas, Paint paint) {
        paint.setStrokeWidth(3);
        paint.setStyle(Paint.Style.STROKE);

        float circleSpacing=12;
        float x=getWidth()/2;
        float y=getHeight()/2;

        canvas.save();

        canvas.translate(x, y);
        canvas.scale(scaleFloat, scaleFloat);
        canvas.rotate(degrees);

        //draw two big arc
        float[] bStartAngles=new float[]{135,-45};
        for (int i = 0; i < 2; i++) {
            RectF rectF=new RectF(-x+circleSpacing,-y+circleSpacing,x-circleSpacing,y-circleSpacing);
            canvas.drawArc(rectF, bStartAngles[i], 90, false, paint);
        }

        canvas.restore();
        canvas.translate(x, y);
        canvas.scale(scaleFloat, scaleFloat);
        canvas.rotate(-degrees);
        //draw two small arc
        float[] sStartAngles=new float[]{225,45};
        for (int i = 0; i < 2; i++) {
            RectF rectF=new RectF(-x/1.8f+circleSpacing,-y/1.8f+circleSpacing,x/1.8f-circleSpacing,y/1.8f-circleSpacing);
            canvas.drawArc(rectF, sStartAngles[i], 90, false, paint);
        }
    }

    @Override
    public ArrayList<ValueAnimator> onCreateAnimators() {
        ArrayList<ValueAnimator> animators=new ArrayList<>();
        ValueAnimator scaleAnim= ValueAnimator.ofFloat(1,0.6f,1);
        scaleAnim.setDuration(1000);
        scaleAnim.setRepeatCount(-1);
        addUpdateListener(scaleAnim,new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                scaleFloat = (float) animation.getAnimatedValue();
                postInvalidate();
            }
        });

        ValueAnimator rotateAnim= ValueAnimator.ofFloat(0, 180,360);
        rotateAnim.setDuration(1000);
        rotateAnim.setRepeatCount(-1);
        addUpdateListener(rotateAnim,new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                degrees = (float) animation.getAnimatedValue();
                postInvalidate();
            }
        });
        animators.add(scaleAnim);
        animators.add(rotateAnim);
        return animators;
    }

}