Android实现笑脸进度加载动画

最近看到豆瓣的笑脸loading很有意思，看一张效果图：

下面分析一下如何实现这样的效果：

1、默认状态是一张笑脸的状态(一个嘴巴，两个眼睛，默认状态)

2、开始旋转，嘴巴追上眼睛(合并状态)

3、追上以后自转一周(自转状态)

4、然后逐渐释放眼睛(分离状态)

5、回到初始笑脸状态（默认状态）

首先需要确定好嘴巴和眼睛的初始位置，我这里的初始化嘴巴是一个半圆，在横轴下方。眼睛分别与横轴夹角60度，如下图：

这两部分可以使用pathMeasure，我这里使用最简单的两个api：canvas.drawArc()和canvas.drawPoint()。

//画起始笑脸canvas.drawArc(-radius, -radius, radius, radius, startAngle, swipeAngle, false,facePaint);

这里的startAngle初始值为0，swiperAngle为180，半径radius为40。

（1）初始化眼睛坐标

/** * 初始化眼睛坐标 */ private void initEyes() {//默认两个眼睛坐标位置 角度转弧度leftEyeX = (float) (-radius * Math.cos(eyeStartAngle * Math.PI / 180));leftEyeY = (float) (-radius * Math.sin(eyeStartAngle * Math.PI / 180));rightEyeX = (float) (radius * Math.cos(eyeStartAngle * Math.PI / 180));rightEyeY = (float) (-radius * Math.sin(eyeStartAngle * Math.PI / 180)); }

注意：需要将角度转弧度

（2）开始画眼睛

//画起始眼睛 canvas.drawPoint(leftEyeX, leftEyeY, eyePaint); canvas.drawPoint(rightEyeX, rightEyeY, eyePaint);二、合并状态

这个状态可以分为两部分

开启动画

faceLoadingAnimator = ValueAnimator.ofFloat(0, 1).setDuration(1000); faceLoadingAnimator.setInterpolator(new AccelerateDecelerateInterpolator()); faceLoadingAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) {faceValue = (float) animation.getAnimatedValue();invalidate(); }});//动画延迟500ms启动faceLoadingAnimator.setStartDelay(200);faceLoadingAnimator.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) {//恢复起始状态currentStatus = smileStatus; } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { }});

动画执行时间1s，记录动画当前执行进度值，存放在faceValue中。当动画执行结束的时候，需要将状态恢复到默认状态，调用invalidate的时候，进入onDraw()方法，开始重新绘制嘴巴。

//记录时刻的旋转角度startAngle = faceValue * 360;//追上右边眼睛if (startAngle >= 120 + startAngle / 2) { canvas.drawArc(-radius, -radius, radius, radius, startAngle, swipeAngle, false, facePaint); //开始自转一圈 mHandler.sendEmptyMessage(2); //此时记录自转一圈起始的角度 circleStartAngle = 120 + startAngle / 2;} else { //追眼睛的过程 canvas.drawArc(-radius, -radius, radius, radius, startAngle, swipeAngle, false, facePaint);}

这里的每次旋转角度为startAngle。当完全追赶上右侧眼睛的时候，开始执行自转一周，并停止当前动画。

眼睛的开始旋转速度明显是慢于嘴巴的旋转速度，所以每次的旋转速度可以设置为嘴巴的一半

//画左边眼睛 ，旋转的角度设置为笑脸旋转角度的一半，这样笑脸才能追上眼睛 leftEyeX = (float) (-radius * Math.cos((60 + startAngle / 2) * Math.PI / 180)); leftEyeY = (float) (-radius * Math.sin((60 + startAngle / 2) * Math.PI / 180)); canvas.drawPoint(leftEyeX, leftEyeY, eyePaint); //画右边眼睛 ，旋转的角度设置为笑脸旋转角度的一半，这样笑脸才能追上眼睛 rightEyeX = (float) (radius * Math.cos((60 - startAngle / 2) * Math.PI / 180)); rightEyeY = (float) (-radius * Math.sin((60 - startAngle / 2) * Math.PI / 180)); canvas.drawPoint(rightEyeX, rightEyeY, eyePaint);三、自转状态1、开启动画

circleAnimator = ValueAnimator.ofFloat(0, 1).setDuration(1000);circleAnimator.setInterpolator(new LinearInterpolator());circleAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) {circleValue = (float) animation.getAnimatedValue();invalidate(); }});circleAnimator.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) {mHandler.sendEmptyMessage(3); } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { }});2、重新绘制

canvas.drawArc(-radius, -radius, radius, radius,circleStartAngle + circleValue * 360,swipeAngle, false, facePaint);四、分离状态

主要的注意点就是眼睛的旋转角度设置为嘴巴旋转角度的2倍，这样才会达到眼睛超过嘴巴的效果，主要的旋转代码如下：

startAngle = faceValue * 360;//判断当前笑脸的起点是否已经走过260度 (吐出眼睛的角度，角度可以任意设置)if (startAngle >= splitAngle) { //画左边眼睛 ，旋转的角度设置为笑脸旋转角度的2倍，这样眼睛才能快于笑脸旋转速度 leftEyeX = (float) (-radius * Math.cos((eyeStartAngle + startAngle * 2) * Math.PI / 180)); leftEyeY = (float) (-radius * Math.sin((eyeStartAngle + startAngle * 2) * Math.PI / 180)); canvas.drawPoint(leftEyeX, leftEyeY, eyePaint); //画右边眼睛 ，旋转的角度设置为笑脸旋转角度的2倍，这样眼睛才能快于笑脸旋转速度 rightEyeX = (float) (radius * Math.cos((eyeStartAngle - startAngle * 2) * Math.PI / 180)); rightEyeY = (float) (-radius * Math.sin((eyeStartAngle - startAngle * 2) * Math.PI / 180)); canvas.drawPoint(rightEyeX, rightEyeY, eyePaint);}//画笑脸canvas.drawArc(-radius, -radius, radius, radius, startAngle, swipeAngle,false, facePaint);最后附上完整代码

public class FaceView2 extends View { //圆弧半径 private int radius = 40; //圆弧画笔宽度 private float paintWidth = 15; //笑脸状态(一个脸，两个眼睛) private final int smileStatus = 0; //加载状态 合并眼睛，旋转 private final int loadingStatus = 1; //合并完成 转一圈 private final int circleStatus = 2; //转圈完成 吐出眼睛 private final int splitStatus = 3; //当前状态 private int currentStatus = smileStatus; //笑脸画笔 private Paint facePaint; //眼睛画笔 private Paint eyePaint; //笑脸开始角度 private float startAngle; //笑脸弧度 private float swipeAngle; //左侧眼睛起点x轴坐标 private float leftEyeX = 0; //左侧眼睛起点y轴坐标 private float leftEyeY = 0; //右侧眼睛起点x轴坐标 private float rightEyeX; //右侧眼睛起点y轴坐标 private float rightEyeY; //一开始默认状态笑脸转圈动画 private ValueAnimator faceLoadingAnimator; //吞并完成后，自转一圈动画 private ValueAnimator circleAnimator; //faceLoadingAnimator动画进度值 private float faceValue; //circleAnimator动画进度值 private float circleValue; //记录开始自转一圈的起始角度 private float circleStartAngle; //吐出眼睛的角度 private float splitAngle; private float initStartAngle; //眼睛起始角度 private float eyeStartAngle = 60; public FaceView2(Context context) {this(context, null); } public FaceView2(Context context, AttributeSet attrs) {this(context, attrs, 0); } public FaceView2(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);//自定义属性TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.FaceView2,defStyleAttr, 0);initStartAngle = typedArray.getFloat(R.styleable.FaceView2_startAngle, 0);swipeAngle = typedArray.getFloat(R.styleable.FaceView2_swipeAngle, 180);splitAngle = typedArray.getFloat(R.styleable.FaceView2_splitAngle, 260);typedArray.recycle();startAngle = initStartAngle;eyeStartAngle += startAngle;initEyes();initPaint();//开始默认动画initAnimator(); } /** * 初始化画笔 */ private void initPaint() {//初始化画笔facePaint = new Paint();facePaint.setStrokeWidth(paintWidth);facePaint.setColor(Color.RED);facePaint.setAntiAlias(true);facePaint.setStyle(Paint.Style.STROKE);facePaint.setStrokeCap(Paint.Cap.ROUND);eyePaint = new Paint();eyePaint.setStrokeWidth(paintWidth);eyePaint.setColor(Color.RED);eyePaint.setAntiAlias(true);eyePaint.setStyle(Paint.Style.STROKE);eyePaint.setStrokeCap(Paint.Cap.ROUND); } /** * 初始化眼睛坐标 */ private void initEyes() {//默认两个眼睛坐标位置 角度转弧度leftEyeX = (float) (-radius * Math.cos(eyeStartAngle * Math.PI / 180));leftEyeY = (float) (-radius * Math.sin(eyeStartAngle * Math.PI / 180));rightEyeX = (float) (radius * Math.cos(eyeStartAngle * Math.PI / 180));rightEyeY = (float) (-radius * Math.sin(eyeStartAngle * Math.PI / 180)); } private Handler mHandler = new Handler(new Handler.Callback() {@RequiresApi(api = Build.VERSION_CODES.KITKAT)@Overridepublic boolean handleMessage(Message msg) { switch (msg.what) {case 1: //启动一开始笑脸转圈动画，并且开始合并眼睛 currentStatus = loadingStatus; faceLoadingAnimator.start(); break;case 2: //暂停眼睛和笑脸动画 currentStatus = circleStatus; faceLoadingAnimator.pause(); //启动笑脸自转一圈动画 circleAnimator.start(); break;case 3: //恢复笑脸转圈动画，并且开始分离眼睛 currentStatus = splitStatus; circleAnimator.cancel(); faceLoadingAnimator.resume(); invalidate(); break; } return false;} }); @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) @Override protected void onDraw(Canvas canvas) {super.onDraw(canvas);//画布移到中间canvas.translate(getWidth() / 2, getHeight() / 2);switch (currentStatus) { //起始状态 case smileStatus://起始角度为0startAngle = initStartAngle;//画起始笑脸canvas.drawArc(-radius, -radius, radius, radius, startAngle, swipeAngle, false,facePaint);//重置起始眼睛坐标initEyes();//画起始眼睛canvas.drawPoint(leftEyeX, leftEyeY, eyePaint);canvas.drawPoint(rightEyeX, rightEyeY, eyePaint);//更改状态，进行笑脸合并眼睛mHandler.sendEmptyMessage(1);break; //合并状态 case loadingStatus://记录时刻的旋转角度startAngle = faceValue * 360;//追上右边眼睛if (startAngle >= 120 + startAngle / 2) { canvas.drawArc(-radius, -radius, radius, radius, startAngle, swipeAngle, false, facePaint); //开始自转一圈 mHandler.sendEmptyMessage(2); //此时记录自转一圈起始的角度 circleStartAngle = 120 + startAngle / 2;} else { //追眼睛的过程 canvas.drawArc(-radius, -radius, radius, radius, startAngle, swipeAngle, false, facePaint);}//画左边眼睛 ，旋转的角度设置为笑脸旋转角度的一半，这样笑脸才能追上眼睛leftEyeX = (float) (-radius * Math.cos((60 + startAngle / 2) * Math.PI / 180));leftEyeY = (float) (-radius * Math.sin((60 + startAngle / 2) * Math.PI / 180));canvas.drawPoint(leftEyeX, leftEyeY, eyePaint);//画右边眼睛 ，旋转的角度设置为笑脸旋转角度的一半，这样笑脸才能追上眼睛rightEyeX = (float) (radius * Math.cos((60 - startAngle / 2) * Math.PI / 180));rightEyeY = (float) (-radius * Math.sin((60 - startAngle / 2) * Math.PI / 180));canvas.drawPoint(rightEyeX, rightEyeY, eyePaint);break; //自转一圈状态 circleValue * 360 为旋转角度 case circleStatus:canvas.drawArc(-radius, -radius, radius, radius,circleStartAngle + circleValue * 360,swipeAngle, false, facePaint);break; //笑脸眼睛分离状态 case splitStatus:startAngle = faceValue * 360;//判断当前笑脸的起点是否已经走过260度 (吐出眼睛的角度，角度可以任意设置)if (startAngle >= splitAngle) { //画左边眼睛 ，旋转的角度设置为笑脸旋转角度的2倍，这样眼睛才能快于笑脸旋转速度 leftEyeX = (float) (-radius * Math.cos((eyeStartAngle + startAngle * 2) * Math.PI / 180)); leftEyeY = (float) (-radius * Math.sin((eyeStartAngle + startAngle * 2) * Math.PI / 180)); canvas.drawPoint(leftEyeX, leftEyeY, eyePaint); //画右边眼睛 ，旋转的角度设置为笑脸旋转角度的2倍，这样眼睛才能快于笑脸旋转速度 rightEyeX = (float) (radius * Math.cos((eyeStartAngle - startAngle * 2) * Math.PI / 180)); rightEyeY = (float) (-radius * Math.sin((eyeStartAngle - startAngle * 2) * Math.PI / 180)); canvas.drawPoint(rightEyeX, rightEyeY, eyePaint);}//画笑脸canvas.drawArc(-radius, -radius, radius, radius, startAngle, swipeAngle,false, facePaint);break;} } /** * 初始化动画 */ private void initAnimator() {faceLoadingAnimator = ValueAnimator.ofFloat(0, 1).setDuration(1000);faceLoadingAnimator.setInterpolator(new AccelerateDecelerateInterpolator());faceLoadingAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) {faceValue = (float) animation.getAnimatedValue();invalidate(); }});//动画延迟500ms启动faceLoadingAnimator.setStartDelay(200);faceLoadingAnimator.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) {//恢复起始状态currentStatus = smileStatus; } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { }});circleAnimator = ValueAnimator.ofFloat(0, 1).setDuration(1000);circleAnimator.setInterpolator(new LinearInterpolator());circleAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) {circleValue = (float) animation.getAnimatedValue();invalidate(); }});circleAnimator.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) {mHandler.sendEmptyMessage(3); } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { }}); }}

自定义属性

<declare-styleable name='FaceView2'><attr name='startAngle' format='dimension' /><attr name='swipeAngle' format='dimension' /><attr name='splitAngle' format='dimension' /></declare-styleable>

布局文件中使用

<com.example.viewdemo.FaceView2 android:layout_width='match_parent' android:layout_height='match_parent'/>

完整代码都在上面啦.

到这里就结束啦.

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