对于CoordinatorLayout内的RecyclerView,滚动无法正常工作

Question

其实我有2个问题

1.滚动不能正常工作,有时当我们在特定方向上滚动非常小的距离并离开触摸时,滚动非常快,直到特定方向的末端,即上下颠倒

第2位.我希望自定义工具栏的标题仅在其折叠时显示,并且在展开时应隐藏标题

这是XML代码

<android.support.design.widget.CoordinatorLayout
android:id="@+id/rootLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
>

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="256dp"
    android:id="@+id/appBarLayout"
    >

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsingToolbarLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_scrollFlags="scroll|exitUntilCollapsed"
        app:contentScrim="?attr/colorPrimary"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        android:clickable="true"
        android:foreground="?android:attr/selectableItemBackground"
        >

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/imageone"
            app:layout_collapseMode="parallax"
            app:layout_collapseParallaxMultiplier="0.7"
            android:scaleType="fitCenter"
            />

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar22"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:layout_collapseMode="pin"
            />

    </android.support.design.widget.CollapsingToolbarLayout>

</android.support.design.widget.AppBarLayout>

<android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/recyclerview1"
    android:layout_centerHorizontal="true"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    android:layout_marginTop="-30dp"
    android:layout_marginLeft="3dp"
    android:layout_marginRight="3dp"
    />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fabBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:layout_anchor="@id/appBarLayout"
    app:layout_anchorGravity="bottom|right|end"
    android:src="@drawable/ic_favourite"
    android:layout_marginBottom="@dimen/fab_margin_bottom"
    android:layout_marginRight="@dimen/fab_margin_right"

    app:fabSize="normal" />

Answer 1

// 工具栏展开和折叠时隐藏和显示标题

appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
       boolean isShow = false;
       int scrollRange = -1;

       @Override
       public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
           if (scrollRange == -1) {
               scrollRange = appBarLayout.getTotalScrollRange();
           }
           if (scrollRange + verticalOffset == 0) {
                //set your title when you scroll up
               collapsingToolbar.setTitle(title);
               isShow = true;
           } else if (isShow) {
               //title will disappear when you scroll down 
               collapsingToolbar.setTitle(" ");
               isShow = false;
           }
       }
   });