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我用FloatingActionButton的时候遇到了一个问题，当我设置backgroundTint的时候会导致Activity抛出InflateException，没有设置backgroundTint就不会产生这个异常，这是为什么？我已经尝试了多种变化，但它们都没有效果。有任何想法吗？ ，下面是我的代码在Activity中使用FloatingActionButton导致片段抛出InflateException
XML：
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/books_refresh"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="58dp">
<android.support.v7.widget.RecyclerView
android:id="@+id/list_of_books_rv"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>
<android.support.design.widget.FloatingActionButton
android:id="@+id/move_top"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/ten_dp"
android:backgroundTint="#ffffff"
android:src="@mipmap/ic_launcher"
app:elevation="@dimen/ten_dp"
app:fabSize="normal"
app:layout_anchor="@id/list_of_books_rv"
app:layout_anchorGravity="bottom|right"
app:pressedTranslationZ="10.0dip"
tools:targetApi="lollipop" />
</android.support.design.widget.CoordinatorLayout>
例外：
java.lang.RuntimeException: Unable to resume activity {library.houhan.com.hhlibrary/library.houhan.com.hhlibrary.MainActivity}: android.view.InflateException: Binary XML file line #23: Binary XML file line #23: Error inflating class android.support.design.widget.FloatingActionButton
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3480)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3518)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2790)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1599)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5985)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:939)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:800)
Caused by: android.view.InflateException: Binary XML file line #23: Binary XML file line #23: Error inflating class android.support.design.widget.FloatingActionButton
at android.view.LayoutInflater.inflate(LayoutInflater.java:545)
at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
at library.houhan.com.base.BaseFragment.onCreateView(BaseFragment.kt:27)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2337)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1419)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1740)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1809)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:799)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2580)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2367)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2322)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2229)
at android.support.v4.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3221)
at android.support.v4.app.FragmentManagerImpl.dispatchResume(FragmentManager.java:3181)
at android.support.v4.app.FragmentController.dispatchResume(FragmentController.java:214)
at android.support.v4.app.FragmentActivity.onResumeFragments(FragmentActivity.java:463)
at android.support.v4.app.FragmentActivity.onPostResume(FragmentActivity.java:452)
at android.support.v7.app.AppCompatActivity.onPostResume(AppCompatActivity.java:171)
at android.app.Activity.performResume(Activity.java:6465)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3459)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3518)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2790)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1599)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5985)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:939)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:800)
Caused by: android.view.InflateException: Binary XML file line #23: Error inflating class android.support.design.widget.FloatingActionButton
at android.view.LayoutInflater.createView(LayoutInflater.java:651)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:770)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:710)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:844)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:804)
at android.view.LayoutInflater.inflate(LayoutInflater.java:521)
at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
at library.houhan.com.base.BaseFragment.onCreateView(BaseFragment.kt:27)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2337)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1419)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1740)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1809)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:799)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2580)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2367)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2322)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2229)
at android.support.v4.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3221)
at android.support.v4.app.FragmentManagerImpl.dispatchResume(FragmentManager.java:3181)
at android.support.v4.app.FragmentController.dispatchResume(FragmentController.java:214)
at android.support.v4.app.FragmentActivity.onResumeFragments(FragmentActivity.java:463)
at android.support.v4.app.FragmentActivity.onPostResume(FragmentActivity.java:452)
at android.support.v7.app.AppCompatActivity.onPostResume(AppCompatActivity.java:171)
at android.app.Activity.performResume(Activity.java:6465)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3459)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3518)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2790)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1599)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5985)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:939)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:800)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance(Native Method)
at android.view.LayoutInflater.createView(LayoutInflater.java:625)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:770)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:710)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:844)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:804)
at android.view.LayoutInflater.inflate(LayoutInflater.java:521)
at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
at library.houhan.com.base.BaseFragment.onCreateView(BaseFragment.kt:27)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2337)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1419)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1740)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1809)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:799)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2580)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2367)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2322)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2229)
at android.support.v4.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3221)
at android.support.v4.app.FragmentManagerImpl.dispatchResume(FragmentManager.java:3181)
at android.support.v4.app.FragmentController.dispatchResume(FragmentController.java:214)
at android.support.v4.app.FragmentActivity.onResumeFragments(FragmentActivity.java:463)
at android.support.v4.app.FragmentActivity.onPostResume(FragmentActivity.java:452)
at android.support.v7.app.AppCompatActivity.onPostResume(AppCompatActivity.java:171)
at android.app.Activity.performResume(Activity.java:6465)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3459)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3518)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2790)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1599)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5985)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:939)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:800)
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:1723)
at android.graphics.drawable.LayerDrawabl