片段中的android底部工作表未將數據綁定到回收站視圖

Question

我有一個帶有回收器視圖的底部工作表，當它初始化時，項目列表是空的，一旦在另一個片段用戶選擇一個項目，適配器將被更新並通知更改，但它不起作用，什么也沒有發生

這是類片段

public class HomeFragment extends Fragment {

    private BottomSheetBehavior mBottomSheetBehavior;
    private RecyclerView mRecyclerView;
    private ItemAdapter mAdapter = new ItemAdapter(new ArrayList<Items>());
    private ArrayList<Items> billList = new ArrayList<>();


//this is the onCreateView code
public View onCreateView(@NonNull LayoutInflater inflater,
                         ViewGroup container, Bundle savedInstanceState) {

    View root = inflater.inflate(R.layout.fragment_menu, container, false);

    View bottomSheet = root.findViewById(R.id.bottom_sheet);

    mBottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);
    mBottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
        }
        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
        }
    });

    mRecyclerView = root.findViewById(R.id.rv_cached_order_item);
    mAdapter = new ItemAdapter(billList);
    mRecyclerView.setAdapter(mAdapter);
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);
    mRecyclerView.setLayoutManager(linearLayoutManager);

    Button button = root.findViewById(R.id.btn_menu_order);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Log.d("TAG", "BottomSheetBehavior");
            mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
        }
    });
    initUser(root);
    return root;
}

// and this is where I notify the item change

    public void addToBill(Items item) {
        billList.add(item);
        mAdapter.notifyDataSetChanged();

    }
}

//XML文件看起來像這樣它包含視圖頁面，在視圖尋呼機上有一個回收器視圖，用戶選擇一個項目，雖然界面我更新了底部表回收器視圖適配器

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".Activity.ui.home.HomeFragment">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="50dp"
        tools:context=".MainActivity">
        <com.google.android.material.tabs.TabLayout
            android:id="@+id/menu_tab"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:tabBackground="@color/app_background"
            app:tabIndicatorColor="@color/colorAccent"
            app:tabMode="scrollable"
            app:tabTextColor="@color/colorAccent">


        </com.google.android.material.tabs.TabLayout>
        <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/menu_pager"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/menu_tab" />
    </androidx.constraintlayout.widget.ConstraintLayout>

    <LinearLayout
        android:id="@+id/bottom_sheet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/white"
        android:fitsSystemWindows="true"
        android:orientation="vertical"
        app:behavior_hideable="true"
        app:behavior_peekHeight="250dp"
        app:layout_behavior="@string/bottom_sheet_behavior"
        app:layout_constraintBottom_toBottomOf="parent">

        <Button
            android:id="@+id/btn_menu_order"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingBottom="0dp"
            android:text="@string/order"
            android:background="@color/app_background"
            android:textColor="@color/colorAccent"
            app:layout_constraintBottom_toTopOf="@+id/menu_coordinatorLayout"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/menu_pager"
            app:layout_constraintVertical_bias="1.0" />
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/rv_cached_order_item"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"

            />

    </LinearLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Answer 1

解決ItemAdapter靜態成員函數