好的，到了这里基本上就没有什么东西了，由于考虑到三个小球转动的速度不一样，所以我们就把每隔小球所执行动画的时间设置不一样就可以了~，好的Over！
下面上全家福~
PostManLoadingView.java import android.animation.ValueAnimator; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.support.annotation.Nullable; import android.util.AttributeSet; import android.view.View; import android.view.animation.LinearInterpolator; /** * Created by zhuyong on 2017/7/20. */ public class PostManLoadingView extends View { private Paint mPaintCircle; private Paint mPaintPoint; private int mRandius = 40; private int mInterval = 50;//空心圆之间的间隔 //第一个小圆圆心坐标 private float X1; private float Y1; //第二个小圆圆心坐标 private float X2; private float Y2; //第三个小圆圆心坐标 private float X3; private float Y3; public PostManLoadingView(Context context) { this(context, null); } public PostManLoadingView(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } public PostManLoadingView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mPaintCircle = new Paint(); mPaintCircle.setAntiAlias(true); mPaintCircle.setStyle(Paint.Style.STROKE); mPaintCircle.setStrokeWidth(3); mPaintCircle.setColor(Color.RED); mPaintPoint = new Paint(); mPaintPoint.setAntiAlias(true); mPaintPoint.setStyle(Paint.Style.FILL); mPaintPoint.setColor(Color.RED); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); int mWidth = MeasureSpec.getSize(widthMeasureSpec); setMeasuredDimension(mWidth, mWidth); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); int centerX = getWidth() / 2; int centerY = getHeight() / 2; //绘制实心圆 canvas.drawCircle(centerX, centerY, mRandius, mPaintPoint); //绘制空心圆 canvas.drawCircle(centerX, centerY, mRandius + mInterval, mPaintCircle); canvas.drawCircle(centerX, centerY, mRandius + mInterval + mInterval, mPaintCircle); canvas.drawCircle(centerX, centerY, mRandius + mInterval + mInterval + mInterval, mPaintCircle); //绘制滚动的小圆球 canvas.drawCircle(centerX + X1, centerY + Y1, 20, mPaintPoint); canvas.drawCircle(centerX + X2, centerY + Y2, 20, mPaintPoint); canvas.drawCircle(centerX + X3, centerY + Y3, 20, mPaintPoint); } public void start() { ValueAnimator animator1 = getValueAnimator(mRandius + mInterval); animator1.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { float deg = (float) valueAnimator.getAnimatedValue(); float rad = (float) (Math.PI * deg / 180); Y1 = (float) (Math.sin(rad) * (mRandius + mInterval)); X1 = (float) (Math.cos(rad) * (mRandius + mInterval)); } }); animator1.start(); ValueAnimator animator2 = getValueAnimator(mRandius + mInterval + mInterval); animator2.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { float deg = (float) valueAnimator.getAnimatedValue(); float rad = (float) (Math.PI * deg / 180); Y2 = (float) (Math.sin(rad) * (mRandius + mInterval + mInterval)); X2 = (float) (Math.cos(rad) * (mRandius + mInterval + mInterval)); } }); animator2.start(); ValueAnimator animator3 = getValueAnimator(mRandius + mInterval + mInterval + mInterval); animator3.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { float deg = (float) valueAnimator.getAnimatedValue(); float rad = (float) (Math.PI * deg / 180); Y3 = (float) (Math.sin(rad) * (mRandius + mInterval + mInterval + mInterval)); X3 = (float) (Math.cos(rad) * (mRandius + mInterval + mInterval + mInterval)); invalidate(); } }); animator3.start(); } public ValueAnimator getValueAnimator(final int mRandius) { ValueAnimator animator = ValueAnimator.ofFloat(0, 360); animator.setDuration(mRandius * 30);//这里动画时间只是随便写的，可以自己设置 animator.setRepeatCount(ValueAnimator.INFINITE); animator.setRepeatMode(ValueAnimator.RESTART); animator.setInterpolator(new LinearInterpolator()); return animator; } } |
xml布局和Activity很简单我就不放了，最后只要调start()方法就可以了~
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