Animated Vector Drawable无法与API 15一起使用 [英] Animated Vector Drawable not working with API 15

问题描述

我一直在尝试在API级别为15的设备上运行Drawable动画。

I've been trying to run an Animated Vector Drawable on a device with API level 15.

以下是我的动画矢量 animated_feedback.xml：

The following is my animated vector "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：

The drawable "feedback.xml" contains the following:

<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>

其中一个动画制作者 background_circle_animator.xml如下：

And one of the animators "background_circle_animator.xml" is the following:

<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：

In my activity_main.xml I have the ImageView that should play this animation:

<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，我具有以下代码：

Finally in my MainActivity.java I have the following code:

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();
}

以下是我的毕业礼物：

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，并且应该

When running this code you should see a white circle with a blue ring on top of it and it should fade in and then fade out.

我在API> 21设备上运行了这段代码，它运行得很完美。

I ran this code on API > 21 device and it ran perfectly.

当我在具有API 15的设备上运行该动画时，一旦动画开始，我将收到以下崩溃信息：

When I run it on a device with API 15 I get the following crash as soon as I the animation starts:

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。

How can I fix this issue as it is very critical to run on devices with API level 15.

推荐答案

我没有API 15设备或仿真器对此进行测试，但是在我看来，您对中间的objectAnimator不满意：

I don't have an API 15 device or emulator to test this, but it seems to me it's not happy with your middle objectAnimator:

 <objectAnimator
    android:duration="700"/>

错误消息的某些部分，例如找不到属性为null的setter / getter，表明它是试图设置一个动画器，但是由于没有动画器应进行动画处理的详细信息，因此它崩溃了。

Parts of your error message such as 'Couldn't find setter/getter for property null' suggest it's trying to set up an animator, but as there are no details of what the animator should be animating, it's crashing.

假定此objectAnimator的目的只是导致动画矢量在淡出之前暂停，我建议尝试这样的操作：

Assuming the purpose of this objectAnimator is just to cause the animated vector to pause before fading out, I would suggest trying something like this:

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

这篇关于Animated Vector Drawable无法与API 15一起使用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！