1.
java.lang.IllegalStateException: View can not be anchored to the the parent CoordinatorLayout
at android.support.design.widget.CoordinatorLayout$LayoutParams.resolveAnchorView(CoordinatorLayout.java:2526) at android.support.design.widget.CoordinatorLayout$LayoutParams.findAnchorView(CoordinatorLayout.java:2495) at android.support.design.widget.CoordinatorLayout.prepareChildren(CoordinatorLayout.java:623) at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:674) at android.view.View.measure(View.java:17448) at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1075) at android.view.View.measure(View.java:17448) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5465) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) at android.view.View.measure(View.java:17448) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5465) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17448) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5465) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at android.view.View.measure(View.java:17448) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5465) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17448) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5465) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2560) at android.view.View.measure(View.java:17448) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2031) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1189) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1402) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1077) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5884) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) at android.view.Choreographer.doCallbacks(Choreographer.java:580) at android.view.Choreographer.doFrame(Choreographer.java:550) at android.view.Choreographer$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:5310) 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:901) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
Support Library版本：23.2.0 compileSdkVersion: 23 Build Tools: 23.0.3
原因：
从23.2.0开始，One of your views is anchored to its parent Coordinator Layout. However, starting at v.23.2.0, this is no longer allowed.
所以，修改代码，不要使用coordinator作为fab的anchor。
app:layout_anchor="@id/coordinator_root"