在官方设计库中使用浮动动作按钮的膨胀异常

我得到了一个 bug 使用官方的 FloatingActionButton从谷歌的支持设计库。

这是我的 LogCat。

android.view.InflateException: Binary XML file line #34: Error inflating class android.support.design.widget.FloatingActionButton
at android.view.LayoutInflater.createView(LayoutInflater.java:633)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:743)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:655)
at android.view.LayoutInflater.inflate(Unknown Source)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at ---.---.com.---.SubCategoryFragment.onCreateView(SubCategoryFragment.java:47)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1789)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:955)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:458)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:117)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:288)
at android.view.LayoutInflater.createView(LayoutInflater.java:607)
... 24 more
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.drawable.Drawable android.graphics.drawable.Drawable$ConstantState.newDrawable()' on a null object reference
at android.graphics.drawable.LayerDrawable$ChildDrawable.<init>(LayerDrawable.java:968)
at android.graphics.drawable.LayerDrawable$LayerState.<init>(LayerDrawable.java:1014)
at android.graphics.drawable.RippleDrawable$RippleState.<init>(RippleDrawable.java:910)
at android.graphics.drawable.RippleDrawable.createConstantState(RippleDrawable.java:901)
at android.graphics.drawable.RippleDrawable.createConstantState(RippleDrawable.java:90)
at android.graphics.drawable.LayerDrawable.mutate(LayerDrawable.java:932)
at android.graphics.drawable.RippleDrawable.mutate(RippleDrawable.java:891)
at android.view.View.applyBackgroundTint(View.java:16324)
at android.view.View.setBackgroundDrawable(View.java:16193)
at android.support.design.widget.FloatingActionButton.access$201(FloatingActionButton.java:56)
at android.support.design.widget.FloatingActionButton$1.setBackgroundDrawable(FloatingActionButton.java:118)
at android.support.design.widget.FloatingActionButtonLollipop.setBackgroundDrawable(FloatingActionButtonLollipop.java:75)
at android.support.design.widget.FloatingActionButton.<init>(FloatingActionButton.java:131)
at android.support.design.widget.FloatingActionButton.<init>(FloatingActionButton.java:79)
... 27 more

指向我的应用程序的唯一一行是它膨胀 xml文件的位置，以及该文件中的行即我的 FloatingActionButton。

   <android.support.design.widget.FloatingActionButton
android:id="@+id/myFABSubCat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_margin="16dp"
android:backgroundTint="@color/accent"
android:src="@drawable/add_icon"
app:borderWidth="0dp"
app:elevation="4sp" />

附加信息:

下面是我的应用程序主题:

<resources>


<!-- Base application theme. -->
<style name="MBTIAppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">@color/primary</item>
<item name="colorPrimaryDark">@color/primaryDark</item>
<item name="colorAccent">@color/accent</item>
<item name="android:windowContentOverlay">@null</item>
</style>


<style name="ThemeNoActionBar" parent="MBTIAppTheme">
<item name="windowActionBar">false</item>
</style>


</resources>

是的，我正在使用 AppCompatActivity。

我注意到我正在使用一个旧版本的 appcompat:

com.android.support:appcompat-v7:22.1.1

这似乎是最新的:

compile 'com.android.support:design:22.2.0'

还有,

minSdkVersion 16
targetSdkVersion 22

现在，我确实在某些情况下将 FAB 的可见性设置为 GONE，但这是在它膨胀之后，所以这不会成为问题。

现在，我的5.1设备可以使用这个，但是有问题的用户可以使用5.0。

这是一个已知的错误还是我做错了什么？

59309

小开

最佳答案

com.android.support:appcompat-v7:21+ added support for tinting widgets on devices running pre android 5.1 (API Level 21). To make use of it make sure you extend or set the AppCompat Theme and use app:backgroundTint instead of android:backgroundTint.

Example:

<android.support.design.widget.FloatingActionButton
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:src="@drawable/icon"
app:backgroundTint="@color/accent"
app:borderWidth="0dp" />

小开

Just replace

<android.support.design.widget.FloatingActionButton
...
...
android:backgroundTint
/>

<android.support.design.widget.FloatingActionButton
...
...
app:backgroundTint
/>

小开

Another way to get this message is if you accidentally specified different versions of the appcompat library in different modules. This is likely to happen when you create a new module, since Android Studio defaults to the most current version.

For a tidy way of managing this in multi-module projects, see: In Gradle, how do I declare common dependencies in a single place?

小开

If you're using a VectorDrawableCompat (Vector asset) you should use:

app:srcCompat="@drawable/x"

instead of:

android:src="@drawable/x"

小开

I had the same issue and tried different solution. But the one that worked for me was to ensure that appcompat and design support library versions are the same. for example:

compile 'com.android.support:appcompat-v7:23.2.0'
compile 'com.android.support:design:23.2.0'

小开

in my case, it was because of the false configuration of activity theme. problem was solved after i changed app theme to Theme.AppCompat.xxx.

小开

Just change android to app:

android:backgroundTint="@color/accent"

To:

app:backgroundTint="@color/accent"