一般的刷新動畫是一個圈圈在轉，而頭條的比較特殊，直接上寫好的效果圖(一直不知道怎么把圖片尺寸調小o(╯□╰)o)吧~

刷新動畫_.gif

首先整個效果是通過SVG和vector來實現的，如果不是很了解，請看大佬的文章：

SVG學習--AnimatedVectorDrawable的使用

動畫思路：

整個view可以分為五個部分：

1、最外面的殼(不需要動畫)

2、中間矩形框

3、矩形框中的灰色矩形塊

4、三根短線

5、三根長線

第一步：在drawable文件夾下新建名為refresh的vector文件：

android:width="200dp"

android:height="200dp"

android:viewportHeight="200"

android:viewportWidth="200">

android:name="out_rect"

android:pathData="M70,60

L130,60

Q140,60 140,70

L140,130

Q140,140 130,140

L70,140

Q60,140 60,130

L60,70

Q60,60 70,60"

android:strokeColor="@color/colorCustomHeaderLine"

android:strokeWidth="2" />

android:name="middle_rect"

android:pathData="M71,75

L100,75

L100,95

L72,95

L72,75"

android:strokeColor="@color/colorCustomHeaderLine"

android:strokeWidth="2" />

android:name="inner_rect"

android:fillColor="@color/colorCustomHeaderInner"

android:pathData="M73,76

L99,76

L99,94

L73,94" />

android:name="short_lines"

android:pathData="M108,75

L128,75

M108,85

L128,85

M108,95

L128,95"

android:strokeColor="@color/colorCustomHeaderLine"

android:strokeWidth="2" />

android:name="long_lines"

android:pathData="

M72,105

L128,105

M72,115

L128,115

M72,125

L128,125"

android:strokeColor="@color/colorCustomHeaderLine"

android:strokeWidth="2" />

打開xml右邊的預覽，我們可以看到效果

效果圖.png

第二步：在drawable文件夾下新建名為refresh_vector的animated-vector

android:drawable="@drawable/refresh">

android:name="middle_rect"

android:animation="@animator/anim_middle_rect" />

android:name="short_lines"

android:animation="@animator/anim_short_lines" />

android:name="long_lines"

android:animation="@animator/anim_long_lines" />

android:name="inner_rect"

android:animation="@animator/anim_inner_rect" />

這里需要注意幾點：

1、android:drawable="@drawable/refresh"這里一定要引用上面的refresh文件

2、target標簽下的name一定要和refresh中的path標簽下的名字一致

第三步：新建animator文件夾(不是anim)，并在下面新建短線、長線、中間矩形框和里面矩形對應的objectAnimator集合：

anim_middle_rect.xml:

android:ordering="sequentially">

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M71,75

L100,75

L100,95

L72,95

L72,75"

android:valueTo="M99,75

L128,75

L128,95

L100,95

L100,75"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M99,75

L128,75

L128,95

L100,95

L100,75"

android:valueTo="M99,105

L128,105

L128,125

L100,125

L100,105"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M99,105

L128,105

L128,125

L100,125

L100,105"

android:valueTo="M71,105

L100,105

L100,125

L72,125

L72,105"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M71,105

L100,105

L100,125

L72,125

L72,105"

android:valueTo="M71,75

L100,75

L100,95

L72,95

L72,75"

android:valueType="pathType" />

anim_short_lines.xml:

android:ordering="sequentially">

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M108,75

L128,75

M108,85

L128,85

M108,95

L128,95"

android:valueTo="M72,105

L128,105

M72,115

L128,115

M72,125

L128,125"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M72,105

L128,105

M72,115

L128,115

M72,125

L128,125"

android:valueTo="M72,105

L92,105

M72,115

L92,115

M72,125

L92,125"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M72,105

L92,105

M72,115

L92,115

M72,125

L92,125"

android:valueTo="M72,75

L128,75

M72,85

L128,85

M72,95

L128,95"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M72,75

L128,75

M72,85

L128,85

M72,95

L128,95"

android:valueTo="M108,75

L128,75

M108,85

L128,85

M108,95

L128,95"

android:valueType="pathType" />

anim_long_lines.xml:

android:ordering="sequentially">

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M72,105

L128,105

M72,115

L128,115

M72,125

L128,125"

android:valueTo="M72,75

L92,75

M72,85

L92,85

M72,95

L92,95"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M72,75

L92,75

M72,85

L92,85

M72,95

L92,95"

android:valueTo="M72,75

L128,75

M72,85

L128,85

M72,95

L128,95"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M72,75

L128,75

M72,85

L128,85

M72,95

L128,95"

android:valueTo="M108,105

L128,105

M108,115

L128,115

M108,125

L128,125"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M108,105

L128,105

M108,115

L128,115

M108,125

L128,125"

android:valueTo="M72,105

L128,105

M72,115

L128,115

M72,125

L128,125"

android:valueType="pathType" />

anim_inner_rect.xml

android:ordering="sequentially">

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M73,76

L99,76

L99,94

L73,94"

android:valueTo="M101,76

L127,76

L127,94

L101,94"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M101,76

L127,76

L127,94

L101,94"

android:valueTo="M101,106

L127,106

L127,124

L101,124"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M101,106

L127,106

L127,124

L101,124"

android:valueTo="M73,106

L99,106

L99,124

L73,124"

android:valueType="pathType" />

android:duration="500"

android:interpolator="@android:interpolator/decelerate_cubic"

android:propertyName="pathData"

android:valueFrom="M73,106

L99,106

L99,124

L73,124"

android:valueTo="M73,76

L99,76

L99,94

L73,94"

android:valueType="pathType" />

最后一步，在activity中：

android:id="@+id/imageView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

final AnimatedVectorDrawable animatedVectorDrawable = (AnimatedVectorDrawable) ContextCompat.getDrawable(this, R.drawable.refresh_vector);

findViewById(R.id.imageView).setImageDrawable(animatedVectorDrawable);

animatedVectorDrawable.start();

//循環動畫貌似只能這樣。。。

final Handler mainHandler = new Handler(Looper.getMainLooper());

animatedVectorDrawable.registerAnimationCallback(new Animatable2.AnimationCallback() {

@Override

public void onAnimationEnd(Drawable drawable) {

mainHandler.post(new Runnable() {

@Override

public void run() {

animatedVectorDrawable.start();

}

});

}

});

總結

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