具有关键帧的Android矢量可绘制动画

Question

我正在尝试创建矢量可绘制的变形动画，它看起来像下面的gif。

这是动画的所有代码。

vector.xml

<?xml version="1.0" encoding="utf-8" ?> 
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:height="30dp"
    android:width="66dp"
    android:viewportHeight="300"
    android:viewportWidth="660" >
<path
   android:fillColor="#444444"
   android:pathData="@string/leftcircle"/>
<path
   android:fillColor="#444444"
   android:pathData="@string/rightcircle"/>
<path
     android:name="v"
     android:fillColor="#888888"
     android:pathData="@string/path1" />
</vector>

animation_vector.xml

<?xml version="1.0" encoding="utf-8" ?>
<animated-vector xmlns:android="http://schemas.android.com/apk/res/android" 
android:drawable="@drawable/vector" >
<target
   android:name="v"
   android:animation="@anim/path_morph" />
</animated-vector>

path_morph.xml

<objectAnimator
xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="1000"
android:repeatCount="1"
android:repeatMode="reverse">
<propertyValuesHolder
  android:valueType="pathType"
  android:propertyName="pathData">
  <keyframe android:fraction="0" android:value="@string/path1"/>
  <keyframe android:fraction=".25" android:value="@string/path2"/>
  <keyframe android:fraction=".50" android:value="@string/path3"/>
  <keyframe android:fraction=".75" android:value="@string/path4"/>
  <keyframe android:fraction="1" android:value="@string/path5"/>
</propertyValuesHolder>
</objectAnimator>

这也是strings.xml中的路径数据。

<string name ="path1">M 270,150 C 270,187.37906 252.90964,220.76644 226.11667,242.77442 205.40491,259.78723 178.89511,270 150,270 121.84725,270 95.958829,260.30526 75.491116,244.07216 47.775945,222.09105 30,188.12142 30,150 30,111.70527 47.937943,77.600165 75.869739,55.628783 96.277661,39.575743 122.02056,30 150,30 178.97201,30 205.54599,40.267195 226.2819,57.361549 252.97988,79.370941 270,112.69784 270,150 Z</string>
<string name ="path2">M 270,150 C 270,187.37906 252.90964,220.76644 226.11667,242.77442 205.40491,259.78723 178.89511,270 150,270 121.84725,270 95.958829,260.30526 75.491116,244.07216 47.775945,222.09105 30,188.12142 30,150 30,111.70527 47.937943,77.600165 75.869739,55.628783 96.277661,39.575743 122.02056,30 150,30 178.97201,30 205.54599,40.267195 226.2819,57.361549 252.97988,79.370941 270,112.69784 270,150 Z</string>
<string name ="path3">M 452.83762,150 C 452.83762,205.05673 340.91918,223.02696 310.46441,229.64243 284.27202,235.33202 269.20391,236.28506 240.40866,238.68527 210.11173,241.21065 183.84211,242.12251 161.35408,230.4351 129.96629,214.12233 112.83251,188.6265 112.83251,150.50508 112.83251,112.21035 128.068,86.448772 159.7124,70.275994 186.18123,56.748335 210.11173,59.294424 245.45942,61.314729 274.38422,62.967933 284.69637,65.170902 311.13471,69.988456 344.39869,76.049765 452.83762,90.474484 452.83762,150 Z</string>
<string name ="path4">M 555.87318,152.52538 C 555.87318,207.58211 525.71582,219.24633 496.33248,230.14751 471.20294,239.47054 432.28759,238.60827 405.5686,236.66496 375.18319,234.45499 361.75301,231.64198 336.61554,228.41479 314.31913,225.55234 188.59395,188.6265 188.59395,150.50508 188.59395,112.21035 297.49736,79.662901 343.56017,71.286146 373.38379,65.86257 375.77674,65.35534 409.6092,62.829958 438.50083,60.673379 471.51631,62.981109 497.00278,71.503685 519.66016,79.080223 555.87318,92.999865 555.87318,152.52538 Z</string>
<string name ="path5">M 630,150 C 630,187.41085 612.88056,220.82323 586.04829,242.83055 565.34657,259.80969 538.86332,270 510,270 482.10724,270 456.43718,260.48349 436.05955,244.52022 408.01924,222.5542 390,188.38141 390,150 390,111.54658 408.08691,77.317584 436.21749,55.356271 456.56974,39.467432 482.17925,30 510,30 539.00418,30 565.60499,40.290006 586.35094,57.418512 613.00923,79.428421 630,112.73001 630,150 Z</string>

因此，无论我做什么，我都无法使用关键帧进行这项工作。我要么得到类似的东西：

Method set() with type float not found on target class class android.graphics.drawable.VectorDrawable$VFullPath

还是什么也没有发生。我试过使用，<animator/> <objectAnimator/>但是似乎唯一可行的方法是执行动画集，每个动画集都有延迟<objectAnimator/>，这是从gif创建动画的方式。但是，这对我不起作用，因为我希望能够为动画添加一个插值器并能够反转它，而不是摆弄偏移量和持续时间。

Answer 1

确保您android:valueType="pathType"在objectAnimator.