android – BottomSheetBehavior有兩個RecyclerView

原文鏈接：http://fanwen.aiisen.com/p/1077141.html

 

我在LinearLayout中有一個帶有BottomSheetBehavior的兩個RecyclerView.當您單擊第一個RecyclerView內的項目(帶網格)時,RecyclerView將設置爲Gone,並顯示第二個RecyclerView(帶有列表).當顯示第二個Recycler時,您無法上下滑動BottomSheet而不是List即使在Expanded State中也在滾動.如果First Recycler已經上市,一切都很好.有沒有辦法讓BottomSheet再次上下滑動？

 

<LinearLayout
        android:id="@+id/sliding_layout_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:orientation="vertical"
        app:behavior_hideable="false"
        app:behavior_peekHeight="400dp"
        app:layout_behavior="@string/bottomSheetBehavior">

        <android.support.v7.widget.RecyclerView 
           android:id="@+id/grid"
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:layout_marginEnd="@dimen/activity_horizontal_margin"
           android:layout_marginStart="@dimen/activity_horizontal_margin"
           android:background="@color/white"
           android:clickable="true"
           android:scrollbars="none" />

        <android.support.v7.widget.RecyclerView 
           android:id="@+id/list"
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:layout_marginEnd="@dimen/activity_horizontal_margin"
           android:layout_marginStart="@dimen/activity_horizontal_margin"
           android:background="@color/white"
           android:clickable="true"
           android:scrollbars="none" />
</LinearLayout>

GridAdapter：

 

   @Override
   public void onBindViewHolder(ViewHolder holder, int position) {

    String categorieName = mCategories.get(position);
    final CategoryFilterEvent event = new   CategoryFilterEvent(categorieName);
    holder.grid_item_label.setText(categorieName);

    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            EventBus.getDefault().post(event);
        }
    });
}

主要活動：

 

 @Override
 public void onCreate(Bundle savedInstanceState) {

    linearLayoutManager = new LinearLayoutManager(this);
    listAdapter = new ListAdapter(this, mList);
    recyList.setAdapter(listAdapter);
    recyList.setLayoutManager(linearLayoutManager);

    gridLayoutManager = new GridLayoutManager(this, 3);
    gridAdapter = new GridAdapter(this, new ArrayList<String>());
    recyGrid.setAdapter(gridAdapter);
    recyGrid.setLayoutManager(gridLayoutManager);
}

public void onEventMainThread(CategoryFilterEvent event) {
    recyGrid.setVisibilty(GONE);
    recyList.setVisiblity(VISIBLE);
}

最佳答案

BottomSheetBehavior的實現不支持內部的兩個可滾動視圖,這就是爲什麼這種佈局永遠不會“開箱即用”的原因.但是,這個問題有一個hacky但很簡單的解決方法.首先,我們必須通過將該類的代碼複製到我們的新CustomBottomSheetBehavior類來自定義BottomSheetBehavior.然後,通過替換行來修改“onLayoutChild”方法

 

 

mNestedScrollingChildRef = new WeakReference<>(findScrollingChild(child));

同

 

if (mNestedScrollingChildRef == null) {
    mNestedScrollingChildRef = new WeakReference<>(findScrollingChild(child));
}

mNestedScrollingChildRef在BottomSheetBehavior類中具有包級訪問權限,因此我們無法擴展它.

比,添加以下方法：

 

public void setNestedScrollingChildRef(View v) {
    this.mNestedScrollingChildRef = new WeakReference<View>(v);
}

在您的Activity類中：

 

 RecyclerView recyGrid = (RecyclerView)findViewById(R.id.grid);
 RecyclerView recyList = (RecyclerView)findViewById(R.id.list);
 layout = (LinearLayout)findViewById(R.id.sliding_layout_container);

 recyGrid.addOnItemTouchListener(onItemTouchListener);
 recyList.addOnItemTouchListener(onItemTouchListener);

onItemTouchListener代碼：

 

RecyclerView.OnItemTouchListener onItemTouchListener = new RecyclerView.OnItemTouchListener() {
    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        setScrollable(layout, rv);
        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {

    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }
};

private void setScrollable(View bottomSheet, RecyclerView recyclerView){
    ViewGroup.LayoutParams params = bottomSheet.getLayoutParams();
    if (params instanceof CoordinatorLayout.LayoutParams) {
        CoordinatorLayout.LayoutParams coordinatorLayoutParams = (CoordinatorLayout.LayoutParams) params;
        CoordinatorLayout.Behavior behavior = coordinatorLayoutParams.getBehavior();
        if (behavior != null && behavior instanceof CustomBottomSheetBehavior)
            ((CustomBottomSheetBehavior)behavior).setNestedScrollingChildRef(recyclerView);
    }
}

我們在這裏做的是捕獲所有觸摸事件,來到recyclerViews並將其作爲mNestedScrollingChildRef添加到CustomBottomSheetBehavior類,以便可以正確的方式處理所有滾動事件.

更新於27.02.2018
在BottomSheetDialogFragment中使用這種方法涉及進一步的複製粘貼.我們應該創建CustomBottomSheetDialog,擴展AppCompatDialog並複製BottomSheetDialog類中的所有代碼.然後將類變量mBehavior改爲CustomBottomSheetBehavior,我在上面描述過.

然後,修改“wrapInBottomSheet”方法以在其中設置新行爲：

 

ViewGroup.LayoutParams bottomSheetParams = bottomSheet.getLayoutParams();
    if (bottomSheetParams instanceof CoordinatorLayout.LayoutParams) {
        mBehavior = new CustomBottomSheetBehavior<>();
        mBehavior.setBottomSheetCallback(mBottomSheetCallback);
        mBehavior.setHideable(mCancelable);
        mBehavior.setPeekHeight(*some value here*);
        ((CoordinatorLayout.LayoutParams) bottomSheetParams).setBehavior(mBehavior);
    }

並在您的fragment類中重寫“onCreateDialog”方法以使用CustomBottomSheetDialog：

 

  @NonNull
  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    CustomBottomSheetDialog  dialog = new CustomBottomSheetDialog (getActivity(), R.style.YourDialogTheme);
    dialog.setContentView(R.layout.bottom_sheet_page_fragment);

     RecyclerView recyGrid = (RecyclerView)dialog.findViewById(R.id.grid);
     RecyclerView recyList = (RecyclerView)dialog.findViewById(R.id.list);
     layout = (LinearLayout)dialog.findViewById(R.id.sliding_layout_container);

     recyGrid.addOnItemTouchListener(onItemTouchListener);
     recyList.addOnItemTouchListener(onItemTouchListener);
     return dialog;
    }

其餘代碼保持不變.

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