Animated Vector Drawable无法与API 15一起使用

我一直在尝试在API级别为15的设备上运行Animated Vector Drawable。

以下是我的动画矢量“ animated_feedback.xml”：

<animated-vector xmlns:android="http://schemas.android.com/apk/res/android"
                 android:drawable="@drawable/feedback">

    <target
    android:animation="@animator/background_circle_animator"
    android:name="BG_White_Circle"/>

</animated-vector>

可绘制的“ feedback.xml”包含以下内容：

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="180dp"
        android:height="180dp"
        android:viewportWidth="180"
        android:viewportHeight="180">
    <group
        android:name="BG_White_Circle_Group">
        <path
            android:name="BG_White_Circle"
            android:fillColor="#fff"
            android:pathData="M 90 0 C 139.705627485 0 180 40.2943725152 180 90 C 180 139.705627485 139.705627485 180 90 180 C 40.2943725152 180 0 139.705627485 0 90 C 0 40.2943725152 40.2943725152 0 90 0 Z" />
        <path
            android:name="Ring"
            android:strokeColor="#0094c1"
            android:strokeWidth="5.00000003634922"
            android:strokeMiterLimit="10"
            android:pathData="M 90 9 C 134.735064736 9 171 45.2649352637 171 90 C 171 134.735064736 134.735064736 171 90 171 C 45.2649352637 171 9 134.735064736 9 90 C 9 45.2649352637 45.2649352637 9 90 9 Z" />
    </group>
</vector>

动画师“ background_circle_animator.xml”之一如下：

<set xmlns:android="http://schemas.android.com/apk/res/android"
     android:ordering="sequentially"
     android:fillAfter="true">

    <objectAnimator
        android:propertyName="fillAlpha"
        android:valueType="floatType"
        android:valueFrom="0f"
        android:valueTo="1f"
        android:duration="200"/>

    <objectAnimator
        android:duration="700"/>

    <objectAnimator
        android:propertyName="fillAlpha"
        android:valueType="floatType"
        android:valueFrom="1f"
        android:valueTo="0f"
        android:duration="200"/>

</set>

在我的activity_main.xml中，我具有应播放此动画的ImageView：

<ImageView
    android:id="@+id/feedback_ui"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:visibility="invisible"/>

最后，在我的MainActivity.java中，我有以下代码：

ImageView feedbackUI = (ImageView) findViewById(R.id.feedback_ui);
feedbackUI.setImageResource(R.drawable.animated_feedback);

Drawable animation = feedbackUI.getDrawable();
if (animation instanceof Animatable) {
    feedbackUI.setVisibility(View.VISIBLE);
    ((Animatable) animation).start();
}

以下是我的毕业证书：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "karim.com.testinganimation"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"

        vectorDrawables.useSupportLibrary = true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.4.0'
}

运行此代码时，您应该看到一个白色的圆圈，上面有一个蓝色的环，它应该淡入然后淡出。

我在API> 21设备上运行了这段代码，它运行得非常好。

当我在使用API​​ 15的设备上运行该动画时，动画一开始就会出现以下崩溃：

D/PropertyValuesHolder(19300): Can't find native method using JNI, use reflectionjava.lang.NoSuchMethodError: no method with name='set' signature='(F)V' in class Landroid/support/graphics/drawable/VectorDrawableCompat$VFullPath;
E/PropertyValuesHolder(19300): Couldn't find setter/getter for property null with value type float
E/PropertyValuesHolder(19300): Couldn't find no-arg method for property null: java.lang.NoSuchMethodException: get []
D/AndroidRuntime(19300): Shutting down VM
W/dalvikvm(19300): threadid=1: thread exiting with uncaught exception (group=0x40a9e1f8)
E/AndroidRuntime(19300): FATAL EXCEPTION: main
E/AndroidRuntime(19300): java.lang.NullPointerException
E/AndroidRuntime(19300):    at android.animation.PropertyValuesHolder.setupSetterAndGetter(PropertyValuesHolder.java:513)
E/AndroidRuntime(19300):    at android.animation.ObjectAnimator.initAnimation(ObjectAnimator.java:392)
E/AndroidRuntime(19300):    at android.animation.ValueAnimator.setCurrentPlayTime(ValueAnimator.java:544)
E/AndroidRuntime(19300):    at android.animation.ValueAnimator.start(ValueAnimator.java:934)
E/AndroidRuntime(19300):    at android.animation.ValueAnimator.start(ValueAnimator.java:957)
E/AndroidRuntime(19300):    at android.animation.ObjectAnimator.start(ObjectAnimator.java:370)
E/AndroidRuntime(19300):    at android.animation.AnimatorSet$DependencyListener.startIfReady(AnimatorSet.java:705)
E/AndroidRuntime(19300):    at android.animation.AnimatorSet$DependencyListener.onAnimationEnd(AnimatorSet.java:659)
E/AndroidRuntime(19300):    at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1040)
E/AndroidRuntime(19300):    at android.animation.ValueAnimator.access$900(ValueAnimator.java:49)
E/AndroidRuntime(19300):    at android.animation.ValueAnimator$AnimationHandler.handleMessage(ValueAnimator.java:675)
E/AndroidRuntime(19300):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(19300):    at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(19300):    at android.app.ActivityThread.main(ActivityThread.java:4424)
E/AndroidRuntime(19300):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(19300):    at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(19300):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
E/AndroidRuntime(19300):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
E/AndroidRuntime(19300):    at dalvik.system.NativeStart.main(Native Method)
W/ActivityManager(  164):   Force finishing activity karim.com.testinganimation/.MainActivity

如何解决此问题，因为在具有API级别15的设备上运行非常关键。