Aakaash Jois
Reputation: 288
Cannot animate FAB drawable using AnimatedVectorDrawable
I am trying to animate the FAB drawable but it throws this error. The error is thrown on the line where I call .start() on the drawable.
--------- beginning of crash
04-25 14:40:09.169 25611-25611/com.test.testingfabanimation E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.test.testingfabanimation, PID: 25611
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
at android.graphics.drawable.AnimatedVectorDrawable$VectorDrawableAnimatorRT.createRTAnimator(AnimatedVectorDrawable.java:1262)
at android.graphics.drawable.AnimatedVectorDrawable$VectorDrawableAnimatorRT.parseAnimatorSet(AnimatedVectorDrawable.java:1220)
at android.graphics.drawable.AnimatedVectorDrawable$VectorDrawableAnimatorRT.init(AnimatedVectorDrawable.java:1187)
at android.graphics.drawable.AnimatedVectorDrawable.ensureAnimatorSet(AnimatedVectorDrawable.java:851)
at android.graphics.drawable.AnimatedVectorDrawable.start(AnimatedVectorDrawable.java:834)
at com.test.testingfabanimation.MainActivity$1.onPageSelected(MainActivity.java:41)
at android.support.v4.view.ViewPager.dispatchOnPageSelected(ViewPager.java:1967)
at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:685)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:669)
at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:2284)
at android.view.View.dispatchTouchEvent(View.java:10024)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2626)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2307)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:413)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1809)
at android.app.Activity.dispatchTouchEvent(Activity.java:3061)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:71)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:375)
at android.view.View.dispatchPointerEvent(View.java:10244)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4438)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4306)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3853)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3906)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3872)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3999)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3880)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4056)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3853)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3906)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3872)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3880)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3853)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6246)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6220)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6181)
04-25 14:40:09.171 25611-25611/com.test.testingfabanimation E/AndroidRuntime: at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6349)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:323)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:6169)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)
This is the code in MainActivity where I am trying to animate the FAB.
viewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
switch (position) {
case 0:
fab.setImageResource(R.drawable.animate_forward);
break;
case 1:
fab.setImageResource(R.drawable.animate_backward);
break;
}
Drawable drawable = fab.getDrawable();
if (drawable instanceof AnimatedVectorDrawable)
((AnimatedVectorDrawable) drawable).start();
}
});
I have created custom drawable for animating using Roman Nurik's Android Icon Animator.
<animated-vector xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:aapt="http://schemas.android.com/aapt">
<aapt:attr name="android:drawable">
<vector
android:width="24dp"
android:height="24dp"
android:viewportWidth="24"
android:viewportHeight="24"
android:alpha="1">
<path
android:name="foo"
android:pathData="@string/forward"
android:strokeColor="#000000"
android:strokeWidth="2"
android:strokeLineCap="round"/>
</vector>
</aapt:attr>
<target android:name="path_morph">
<aapt:attr name="android:animation">
<objectAnimator
android:name="foo"
android:propertyName="pathData"
android:duration="300"
android:valueFrom="@string/forward"
android:valueTo="@string/backward"
android:valueType="pathType"
android:interpolator="@android:anim/accelerate_decelerate_interpolator"/>
</aapt:attr>
</target>
</animated-vector>
The animate_forward and animate_backword xmls are similar. Only the string values in path are interchanged.
This is the first time I am working with AnimatedVectorDrawables. Is there something I am missing? All the tutorials show the same code on the web.
Upvotes: 0
Views: 580
Answers (1)
BladeCoder
Reputation: 12949
The target name must be the name of the object to animate. Set the target name to "foo" instead. You also don't need to set any name to the ObjectAnimator itself.
Upvotes: 4
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