Question

我正在尝试使用两个NavigationDrawer创建一个ListViews，但只有一个显示。

这是我的代码：

Nav_DrawerFragment.java

public class Nav_DrawerFragment extends Fragment implements DrawerCallbacks {

private DrawerCallbacks mCallbacks;
private RecyclerView mDrawerList;
private View mFragmentContainerView;
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mActionBarDrawerToggle;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);

    mDrawerList = (RecyclerView) view.findViewById(R.id.drawerList);

    LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);

    /**=============================*/
    mDrawerList.setLayoutManager(layoutManager);
    mDrawerList.setHasFixedSize(true);

    List<NavigationItemTop> navigationItemTop = getMenuTop();
    Nav_adapterTop adapterTop = new Nav_adapterTop(navigationItemTop);
    adapterTop.setNavigationDrawerCallbacks(this);

    mDrawerList.setAdapter(adapterTop);

    /**=============================*/
    mDrawerList.setLayoutManager(layoutManager);
    mDrawerList.setHasFixedSize(true);

    List<NavigationItemBottom> navigationItemBottom = getMenuBottom();
    Nav_adapterBottom adapterBottom = new Nav_adapterBottom(navigationItemBottom);
    adapterBottom.setNavigationDrawerCallbacks(this);

    mDrawerList.setAdapter(adapterBottom);

    return view;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

}

public void setup(int fragmentId, DrawerLayout drawerLayout) {
    mFragmentContainerView = getActivity().findViewById(fragmentId);
    mDrawerLayout = drawerLayout;
    mActionBarDrawerToggle = new ActionBarDrawerToggle(getActivity(), mDrawerLayout, R.string.drawer_open, R.string.drawer_close) {
        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
            if (!isAdded()) return;
            getActivity().invalidateOptionsMenu();
        }

        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            if (!isAdded()) return;
            getActivity().invalidateOptionsMenu();
        }
    };


    mDrawerLayout.post(new Runnable() {
        @Override
        public void run() {
            mActionBarDrawerToggle.syncState();
        }
    });

    mDrawerLayout.setDrawerListener(mActionBarDrawerToggle);
}

public void openDrawer() {
    mDrawerLayout.openDrawer(mFragmentContainerView);
}

public void closeDrawer() {
    mDrawerLayout.closeDrawer(mFragmentContainerView);
}

@Override
public void onDetach() {
    super.onDetach();
    mCallbacks = null;
}

public List<NavigationItemTop> getMenuTop() {
    List<NavigationItemTop> itemTop = new ArrayList<NavigationItemTop>();

    itemTop.add(new NavigationItemTop("item 1"));
    itemTop.add(new NavigationItemTop("item 2"));
    itemTop.add(new NavigationItemTop("item 3"));
    itemTop.add(new NavigationItemTop("item 4"));

    return itemTop;
}

public List<NavigationItemBottom> getMenuBottom() {
    List<NavigationItemBottom> itemsBottom = new ArrayList<NavigationItemBottom>();

    itemsBottom.add(new NavigationItemBottom("In der Nähe "));
    itemsBottom.add(new NavigationItemBottom("Suche "));
    itemsBottom.add(new NavigationItemBottom("Produkte "));
    itemsBottom.add(new NavigationItemBottom("Unsere Story "));
    itemsBottom.add(new NavigationItemBottom("Unsere Werte "));
    itemsBottom.add(new NavigationItemBottom("Kontakt "));
    itemsBottom.add(new NavigationItemBottom("Hilfe "));
    itemsBottom.add(new NavigationItemBottom("Impressum "));
    return itemsBottom;
}


public boolean isDrawerOpen() {
    return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
}

public DrawerLayout getDrawerLayout() {
    return mDrawerLayout;
}

public void setDrawerLayout(DrawerLayout drawerLayout) {
    mDrawerLayout = drawerLayout;
}

Nav_adapterBottom.java

public class Nav_adapterBottom extends RecyclerView.Adapter<Nav_adapterBottom.ViewHolderBottom> {

private List<NavigationItemBottom> mDataBottom;
private DrawerCallbacks mDrawerCallbacksBottom;

public Nav_adapterBottom(List<NavigationItemBottom> data) { mDataBottom = data; }

public void setNavigationDrawerCallbacks(DrawerCallbacks drawerCallbacks) {
    mDrawerCallbacksBottom = drawerCallbacks;
}

@Override
public Nav_adapterBottom.ViewHolderBottom onCreateViewHolder(ViewGroup viewGroup, int i) {
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.drawer_row_bottom, viewGroup, false);
    return new ViewHolderBottom(v);
}
@Override
public void onBindViewHolder(Nav_adapterBottom.ViewHolderBottom viewHolder, final int i) {
    viewHolder.textView.setText(mDataBottom.get(i).getText());
}

@Override
public int getItemCount() {
    return mDataBottom != null ? mDataBottom.size() : 0;
}

public static class ViewHolderBottom extends RecyclerView.ViewHolder {
    public TextView textView;

    public ViewHolderBottom(View itemView) {
        super(itemView);
        textView = (TextView) itemView.findViewById(R.id.item_name_bottom);
    }
}

Nav_adapterTop.java

public class Nav_adapterTop extends RecyclerView.Adapter<Nav_adapterTop.ViewHolderTop> {

private List<NavigationItemTop> mDataTop;
private DrawerCallbacks mDrawerCallbacksTop;

public Nav_adapterTop(List<NavigationItemTop> data) {
    mDataTop = data;
}

public void setNavigationDrawerCallbacks(DrawerCallbacks drawerCallbacksTop) {
    mDrawerCallbacksTop = drawerCallbacksTop;
}

@Override
public Nav_adapterTop.ViewHolderTop onCreateViewHolder(ViewGroup viewGroup, int i) {
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.drawer_row_top, viewGroup, false);
    return new ViewHolderTop(v);
}
@Override
public void onBindViewHolder(Nav_adapterTop.ViewHolderTop viewHolder, final int i) {
    viewHolder.textView.setText(mDataTop.get(i).getText());
}

@Override
public int getItemCount() {
    return mDataTop != null ? mDataTop.size() : 0;
}

public static class ViewHolderTop extends RecyclerView.ViewHolder {
    public TextView textView;

    public ViewHolderTop(View itemView) {
        super(itemView);
        textView = (TextView) itemView.findViewById(R.id.item_name_top);
    }
}

fragment_navigation_drawer.xml

<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawerList"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/myDrawerBackground"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true"
android:scrollbars="vertical"/>

P.S。我是Android的新手

Answer 1

你在这里覆盖自己的适配器：

/**=============================*/
    // set up first adapter

    mDrawerList.setAdapter(adapterTop); // Setting first adapter

    /**=============================*/
    // set up second adapter

    mDrawerList.setAdapter(adapterBottom); // Overwriting the adapter

因此，您只看到一个列表。您不能只是在列表中添加另一个适配器并期望它显示两个列表，您需要在布局中添加两个单独的列表。

用以下内容替换您的NavigationDrawer布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView

        android:id="@+id/drawerListTop"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.5"
        android:background="@color/myDrawerBackground"
        android:clickable="true"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:scrollbars="vertical"/>

    <android.support.v7.widget.RecyclerView

        android:id="@+id/drawerListBottom"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.5"
        android:background="@color/myDrawerBackground"
        android:clickable="true"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:scrollbars="vertical"/>

</LinearLayout>

通过这种方式，您可以创建两个单独的列表，这些列表可以由您的单独适配器填充。

注意：我没有对此进行测试，因此可能存在错误，但这应该可以让您了解如何创建所需的功能。

NavigationDrawer中的两个列表

1 个答案: