Android 动画矢量可绘制不使用API 15

我一直在尝试在API级别为15的设备上运行可绘制的动画向量

以下是我的动画向量“animated_feedback.xml”：

以下是我的简历：

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'
}

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

我在API>21设备上运行了这段代码，它运行得非常完美

当我在带有API 15的设备上运行它时，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API级别为15的设备上运行非常关键。

我没有API 15设备或模拟器来测试此问题，但在我看来，它对您的中间objectAnimator不满意：

 <objectAnimator
    android:duration="700"/>

错误消息的某些部分，如“找不到属性null的setter/getter”，表明它正在尝试设置动画制作程序，但由于没有动画制作程序应该制作什么动画的详细信息，因此它正在崩溃

假设此objectAnimator的目的只是使动画向量在淡出之前暂停，我建议尝试以下操作：

<objectAnimator
    android:propertyName="fillAlpha"
    android:valueType="floatType"
    android:valueFrom="1f"
    android:valueTo="1f"
    android:duration="700"/>

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();
}

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'
}

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

 <objectAnimator
    android:duration="700"/>

<objectAnimator
    android:propertyName="fillAlpha"
    android:valueType="floatType"
    android:valueFrom="1f"
    android:valueTo="1f"
    android:duration="700"/>