仅当用户单击searchView时，才会显示RecyclerView项目

Question

我有一个recyclerView，但只有当用户点击工具栏中的searchView后，才会显示项目（存储在数据库中），之后通常会显示回收站视图中的项目。我对此有点困惑。

你能帮我吗？

片段

//list init

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        database = new ArrayList<>();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_contacts, container, false);
        ButterKnife.bind(this, view);
        return view;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        database = SugarRecord.listAll(ContactORM.class);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
        mAdapter = new ContactsAdapter(getContext(), database);
        recyclerView.setAdapter(mAdapter);
}

适配器

class ContactsAdapter extends RecyclerView.Adapter<ContactsAdapter.ViewHolder> {

    List<ContactORM> database;
    ContactORM contactORM;
    Context mContext;

    public ContactsAdapter(Context context, List<ContactORM> contacts) {
        this.mContext = context;
        this.database = contacts;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int type) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_item_contact, parent, false);
        return new ViewHolder(view);
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.avatar) CircleImageView avatar;
        @BindView(R.id.name) TextView name;

        public ViewHolder(View rowView) {
            super(rowView);
            ButterKnife.bind(this, rowView);
        }
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        contactORM = database.get(holder.getAdapterPosition());

        if ((contactORM.getLastname() != null)) {
            holder.name.setText(contactORM.getName() + " " + contactORM.getLastname());
        } else {
            holder.name.setText(contactORM.getName());
        }
        //if photo is not null, load image
        if (!(contactORM.getPhoto() == null)) {
            Picasso.with(mContext).load(contactORM.getPhoto()).resize(100, 100).into(holder.avatar);
        }
    }

    @Override
    public int getItemCount() {
        return database.size();
    }
}

XML布局

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             tools:context=".ui.contacts.ContactsFragment">

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

        <!-- starts custom searchView -->
        <android.support.design.widget.AppBarLayout
            android:id="@+id/appBarLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fitsSystemWindows="true">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:focusable="true"
                android:focusableInTouchMode="true"
                android:orientation="horizontal"
                app:layout_scrollFlags="scroll|enterAlways">

                <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="12dp"
                    android:layout_marginTop="11dp"
                    android:src="@drawable/ic_search_white_24px"/>

                <EditText
                    android:id="@+id/search"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:layout_marginBottom="5dp"
                    android:layout_marginLeft="5dp"
                    android:layout_marginRight="5dp"
                    android:layout_weight="9"
                    android:hint="@string/search_contact"
                    android:textColor="@android:color/white"
                    android:textSize="18sp"
                    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>

                <ImageButton
                    android:id="@+id/ib_clearText"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginRight="20dp"
                    android:layout_marginTop="11dp"
                    android:background="@color/colorPrimary"
                    android:src="@drawable/ic_clear_white_18px"/>
            </LinearLayout>
            <!-- end custom searchView -->

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

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scrollbars="vertical"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

        <!-- floating action button -->
        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="20dp"
            android:src="@drawable/ic_add_white_24px"/>

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