效果圖：

實現步驟： 初始化五個圓球分別設置中心點,方便畫圓 利用ValueAnimator的值變化來獲取旋轉角度 onDraw來分別畫每個圓具體代碼實現:1、創建Circle對象

package com.sjl.keeplive.track;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PointF;public class Circle { private PointF center; private float radius; public Circle() {center = new PointF(); } /** * 設置圓球半徑 */ public void setRadius(float radius) {this.radius = radius; } /** * 設置中心點 * * @param x * @param y */ public void setCenter(float x, float y) {center.set(x, y); } public void draw(Canvas canvas, Paint paint) {canvas.drawCircle(center.x,center.y,radius,paint); }}2、自定義MinSoftLoadingView實現代碼

package com.sjl.keeplive.track;import android.animation.ValueAnimator;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PointF;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.View;public class MinSoftLoadingView extends View { private int circleCount = 5; private Circle[] circles; private Paint paint; private int width; private int height; private PointF center; private float circleRadius; private float[] rotates; private float roateRadius; public MinSoftLoadingView(Context context) {this(context, null); } public MinSoftLoadingView(Context context, @Nullable AttributeSet attrs) {this(context, attrs, 0); } public MinSoftLoadingView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);paint = new Paint();paint.setAntiAlias(true);paint.setColor(Color.WHITE);//每個點旋轉的角度rotates = new float[circleCount]; } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) {super.onLayout(changed, left, top, right, bottom);width = getWidth();height = getHeight();center = new PointF(width / 2.0f, height / 2.0f);//旋轉掃描半徑roateRadius = Math.min(width, height);//圓球最大的那個半徑circleRadius = roateRadius / 10.0f;initCircle(); } /** * 初始化5個圓球 */ private void initCircle() {circles = new Circle[circleCount];for (int i = 0; i < circleCount; i++) { circles[i] = new Circle(); circles[i].setCenter(center.x, center.y - roateRadius / 2 + circleRadius); circles[i].setRadius(circleRadius - circleRadius * i / 5);}//開始執行動畫startAnimation(); } private void startAnimation() {for (int i = 0; i < circleCount; i++) { final int index = i; ValueAnimator animator = ValueAnimator.ofFloat(0, 360); animator.setRepeatCount(ValueAnimator.INFINITE);//重復 animator.setDuration(2000); animator.setStartDelay(index * 100); //每一個隨后的延遲時間 animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) { rotates[index] = (float) animation.getAnimatedValue(); invalidate();} }); animator.start();} } @Override protected void onDraw(Canvas canvas) {super.onDraw(canvas);for (int i = 0; i < circleCount; i++) { canvas.save(); canvas.rotate(rotates[i], center.x, center.y); circles[i].draw(canvas, paint); canvas.restore();} }}3、布局文件中使用

<com.sjl.keeplive.track.MinSoftLoadingViewandroid:layout_width='60dp'android:layout_height='60dp'android:layout_gravity='center'/>

核心思想就是讓每個球出發的時間不同,這樣每個球鎖旋轉的位置也不同,就形成了一種視覺差!如果把* animator.setStartDelay(index * 100)*的時間改的大一些就可以看得更明顯了!

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