AppBarLayout ScrollingViewBehavior daje mi "wyjątek java.lang.RuntimeException: ten wykres zawiera zależności cykliczne"

Question

Tak więc otrzymuję komunikat o błędzie "java.lang.RuntimeException: ten wykres zawiera zależności cykliczne", którego jestem prawie pewien. przez zachowanie mam to rozciąga się od AppBarLayout.ScrollingViewBehavior. Mam układ z AppBarLayout, który używa tego zachowania i błąd zniknie, jeśli usunę zachowanie. Poniżej znajduje się kod błędu i za zachowanie

E/AndroidRuntime: FATAL EXCEPTION: main 
Process: yu.heetae.android.mergingtoolbar, PID: 26027 
java.lang.RuntimeException: This graph contains cyclic dependencies 
at android.support.design.widget.DirectedAcyclicGraph.dfs(DirectedAcyclicGraph.java:164) 
at android.support.design.widget.DirectedAcyclicGraph.dfs(DirectedAcyclicGraph.java:172) 
at android.support.design.widget.DirectedAcyclicGraph.dfs(DirectedAcyclicGraph.java:172) 
at android.support.design.widget.DirectedAcyclicGraph.getSortedList(DirectedAcyclicGraph.java:152) 
at android.support.design.widget.CoordinatorLayout.prepareChildren(CoordinatorLayout.java:658) 
at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:706) 
at android.view.View.measure(View.java:18794) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 
at android.view.View.measure(View.java:18794) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) 
at android.view.View.measure(View.java:18794) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at android.view.View.measure(View.java:18794) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) 
at android.view.View.measure(View.java:18794) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643) 
at android.view.View.measure(View.java:18794) 
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100) 
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216) 
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452) 
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107) 
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013) 
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) 
at android.view.Choreographer.doCallbacks(Choreographer.java:670) 
at android.view.Choreographer.doFrame(Choreographer.java:606) 
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

public class MergedAppbarBehavior extends AppBarLayout.ScrollingViewBehavior { 

    private Toolbar mToolbar; 
    private View mBackground; 
    private FrameLayout.LayoutParams mBackgroundLayoutParams; 

    private Context mContext; 

    private boolean isInit = false; 

    public MergedAppbarBehavior(Context context, AttributeSet attrs) { 
     super(context, attrs); 
     mContext = context; 
    } 

    @Override 
    public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) { 
     return dependency instanceof NestedScrollView; 
    } 

    @Override 
    public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) { 
     if(!isInit) { 
      init(child); 
      return false; 
     } 

     if(isDependencyYBelowToolbar(child, dependency) && ! isDependencyYReachTop(dependency)) { 
      setToolbarBackground(android.R.color.transparent); 
      setPartialBackgroundHeight((int)((child.getHeight() + child.getY()) - dependency.getY())); 
     } else if(isDependencyYBelowStatusToolbar(child, dependency) || isDependencyYReachTop(dependency)) { 
      setToolbarBackground(Color.parseColor("#3F51B5")); 
      setPartialBackgroundHeight(0); 
     } 

     return false; 
    } 

    private void init(View child) { 
     AppBarLayout appBarLayout = (AppBarLayout) child; 

     mToolbar = (Toolbar) appBarLayout.findViewById(R.id.toolbar); 
     mToolbar.setTitle(" "); 
     mBackground = appBarLayout.findViewById(R.id.background_view); 
     mBackgroundLayoutParams = (FrameLayout.LayoutParams) mBackground.getLayoutParams(); 

     setToolbarBackground(android.R.color.transparent); 
     setPartialBackgroundHeight(0); 

     isInit = true; 
    } 

    private boolean isDependencyYBelowToolbar(View child, View dependency){ 
     return dependency.getY() <= child.getY() + child.getHeight() && dependency.getY() > child.getY(); 
    } 

    private boolean isDependencyYBelowStatusToolbar(View child, View dependency){ 
     return dependency.getY() <= child.getY(); 
    } 

    private boolean isDependencyYReachTop(View dependency){ 
     return dependency.getY() == 0; 
    } 

    private void setPartialBackgroundHeight(int height){ 
     mBackgroundLayoutParams.height = height; 
     mBackground.setLayoutParams(mBackgroundLayoutParams); 
    } 

    private void setToolbarBackground(int color) { 
     mToolbar.setBackgroundColor(ContextCompat.getColor(mContext, color)); 
    } 
} 

Answer 1

miałem ten sam problem z FloatingActionButton. Właśnie usunęliśmy tę linię od mojego XML

app:layout_anchor="@id/list_view" 

Answer 2

Nie bardzo aktywny problem już, ale w przypadku, gdy ktoś prowadzi do tego samego błędu: Sprawdź swoją aplikację: layout_anchors.

Błąd ten właśnie doszło do mnie, kiedy miał konfigurację podobną do tej:

<View 
    android:id="@+id/firstView" 
    app:layout_anchor="@+id/secondView" /> 

<View 
    android:id="@id/secondView" 
    app:layout_anchor="@id/firstView" /> 

Oczywiście rzeczywista sprawa była nieco bardziej skomplikowana, co było, jak ten przedarł się na początku. W każdym razie błąd wskazuje na pętlę zależności.