I am trying to set AppBarLayout height to 0 (and revert to the default value). It resets several times (not always) and only on API 21 (> = 22, etc. It works fine).
I am using StateListAnimator as described in the link below (since this is the "official" way to set the height after supporting-lib 24.0.0):
stack overflow
My actual method is as follows:
public void setAppBarElevation(final boolean visible) { if (appBar != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { appBar.setStateListAnimator(AnimatorInflater.loadStateListAnimator(this, (visible) ? R.animator.appbar_elevated : R.animator.appbar_not_elevated)); } }
Together with two XML files (the other is set android:valueTo="0" ):
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item> <objectAnimator android:propertyName="elevation" android:valueTo="@dimen/default_appbar_elevation" android:valueType="floatType"/> </item> </selector>
I tested some devices with different versions of Android (API 19, 21, 23, 24, 25) and it only crashed to 21.
The log shows that this is some JNI error when setting the height (which comes from StateListAnimator , I think):
--------- beginning of system JNI DETECTED ERROR IN APPLICATION: cant call void android.view.View.setElevation(float) on null object in call to CallVoidMethodV from void android.animation.PropertyValuesHolder.nCallFloatMethod(java.lang.Object, long, float) "main" prio=5 tid=1 Runnable | group="main" sCount=0 dsCount=0 obj=0x72fc2000 self=0xf421c500 | sysTid=20172 nice=0 cgrp=apps sched=0/0 handle=0xf77de160 | state=R schedstat=( 3803514732 320072004 1563 ) utm=340 stm=40 core=0 HZ=100 | stack=0xff6fb000-0xff6fd000 stackSize=8MB | held mutexes= "mutator lock"(shared held) native: #00 pc 00005b13 /system/lib/libbacktrace_libc++.so (UnwindCurrent::Unwind(unsigned int, ucontext*)+83) native: #01 pc 00002e92 /system/lib/libbacktrace_libc++.so (Backtrace::Unwind(unsigned int, ucontext*)+34) native: #02 pc 003c8f68 /system/lib/libart.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, int, char const*, art::mirror::ArtMethod*)+136) native: #03 pc 00391f8d /system/lib/libart.so (art::Thread::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const+285) native: #04 pc 001006b0 /system/lib/libart.so (art::JniAbort(char const*, char const*)+1024) native: #05 pc 0010125f /system/lib/libart.so (art::JniAbortF(char const*, char const*, ...)+111) native: #06 pc 001016b2 /system/lib/libart.so (art::ScopedCheck::CheckVirtualMethod(_jobject*, _jmethodID*)+514) native: #07 pc 00112340 /system/lib/libart.so (art::CheckJNI::CallVoidMethodV(_JNIEnv*, _jobject*, _jmethodID*, char*)+144) native: #08 pc 000776ca /system/lib/libandroid_runtime.so (_JNIEnv::CallVoidMethod(_jobject*, _jmethodID*, ...)+42) native: #09 pc 00123ecb /system/lib/libandroid_runtime.so (???) native: #10 pc 00089596 /data/dalvik-cache/x86/ system@framework @boot.oat (Java_android_animation_PropertyValuesHolder_nCallFloatMethod__Ljava_lang_Object_2JF+174) at android.animation.PropertyValuesHolder.nCallFloatMethod(Native method) at android.animation.PropertyValuesHolder.access$400(PropertyValuesHolder.java:38) at android.animation.PropertyValuesHolder$FloatPropertyValuesHolder.setAnimatedValue(PropertyValuesHolder.java:1296) at android.animation.ObjectAnimator.animateValue(ObjectAnimator.java:952) at android.animation.ValueAnimator.animationFrame(ValueAnimator.java:1207) at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1248) at android.animation.ValueAnimator$AnimationHandler.doAnimationFrame(ValueAnimator.java:659) at android.animation.ValueAnimator$AnimationHandler.run(ValueAnimator.java:682) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) at android.view.Choreographer.doCallbacks(Choreographer.java:580) at android.view.Choreographer.doFrame(Choreographer.java:549) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5219) at java.lang.reflect.Method.invoke!(Native method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Is there a way to hide the AppBar shadow (and turn it back on) using the current support library (I am currently using 25.0.0, but it crashes with 24.xx too)?