所有项目均未显示在RecyclerView Android中

Question

我正在尝试使用RecyclerView填充导航抽屉。我添加了相应的图标和标题。但问题是只有一个（图标+标题）显示。其他人没有表现出来。

NavigationDrawerFragment.java

tool

MyAdapter.java

public class NavigationDrawerFragment extends Fragment {

    private RecyclerView recyclerView;
    private MyAdapter adapter;

    public static final String PREF_FILE_NAME = "testpref";
    public static final String KEY_USER_LEARNED_DRAWER = "user_learned_drawer";

    private ActionBarDrawerToggle mDrawerToggle;
    private DrawerLayout mDrawerLayout;

    private boolean mUserLearnedDrawer;
    private boolean mFromSavedInstanceState;
    private View containerView;

    public NavigationDrawerFragment() {
        // Required empty public constructor
    }


    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mUserLearnedDrawer = Boolean.valueOf(readFromPreference(getActivity(), KEY_USER_LEARNED_DRAWER, "false"));
        if (savedInstanceState != null) {
            mFromSavedInstanceState = true;
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View layout = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
        recyclerView = (RecyclerView) layout.findViewById(R.id.drawer_list);
        adapter = new MyAdapter(getActivity(), getData());
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        return layout;
    }

    public static List<Information> getData() {
        List<Information> data = new ArrayList<>();
        int[] icons = {R.drawable.icon_a, R.drawable.icon_b, R.drawable.icon_c, R.drawable.icon_d};
        String[] titles = {"Ankush", "Tillu", "Shirshak", "Sudeep"};
        for (int i = 0; i < titles.length; i++) {
            Information current = new Information();
            current.iconId = icons[i];
            current.title = titles[i];
            data.add(current);
        }
        return data;
    }

    public void setUp(int fragmentId, DrawerLayout drawerLayout, final Toolbar toolbar) {
        containerView = getActivity().findViewById(fragmentId);
        mDrawerLayout = drawerLayout;
        mDrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {
            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                if (!mUserLearnedDrawer) {
                    mUserLearnedDrawer = true;
                    saveToPreference(getActivity(), KEY_USER_LEARNED_DRAWER, mUserLearnedDrawer + "");
                }
                getActivity().invalidateOptionsMenu();
            }

            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                getActivity().invalidateOptionsMenu();
            }

            @Override
            public void onDrawerSlide(View drawerView, float slideOffset) {
                Log.e("ALPHA", slideOffset + "");
                /*if(slideOffset<0.6){
                    toolbar.setAlpha(1-slideOffset);
                }
                toolbar.clearAnimation();*/
            }
        };
        if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
            mDrawerLayout.openDrawer(containerView);
        }
        mDrawerLayout.setDrawerListener(mDrawerToggle);
        mDrawerLayout.post(new Runnable() {
            @Override
            public void run() {
                mDrawerToggle.syncState();
            }
        });
    }

    public static void saveToPreference(Context context, String preferenceName, String preferenceValue) {
        SharedPreferences sharedPreferences = context.getSharedPreferences(PREF_FILE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString(preferenceName, preferenceValue);
        editor.apply();
    }

    public static String readFromPreference(Context context, String preferenceName, String defaultValue) {
        SharedPreferences sharedPreferences = context.getSharedPreferences(PREF_FILE_NAME, Context.MODE_PRIVATE);
        return sharedPreferences.getString(preferenceName, defaultValue);
    }
}

Information.java

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.Collections;
import java.util.List;

/**
 * Created by ANKUSH on 8/5/2016.
 */
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    private LayoutInflater inflater;
    List<Information> data = Collections.emptyList();

    public MyAdapter(Context context, List<Information> data) {
        inflater = LayoutInflater.from(context);
        this.data = data;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = inflater.inflate(R.layout.custom_row, parent, false);
        MyViewHolder holder = new MyViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        Information current = data.get(position);
        holder.title.setText(current.title);
        holder.icon.setImageResource(current.iconId);
    }

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

    class MyViewHolder extends RecyclerView.ViewHolder {

        TextView title;
        ImageView icon;

        public MyViewHolder(View itemView) {
            super(itemView);
            title = (TextView) itemView.findViewById(R.id.listText);
            icon = (ImageView) itemView.findViewById(R.id.listIcon);
        }
    }
}

fragment_navigation_drawer.xml

package com.akapoor.materialdesignslidenerd;

/**
 * Created by ANKUSH on 8/5/2016.
 */
public class Information {
    int iconId;
    String title;
}

custom_row.xml

<RelativeLayout 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"
    android:background="#FFF"
    tools:context="com.akapoor.materialdesignslidenerd.NavigationDrawerFragment">

    <LinearLayout
        android:id="@+id/containerDrawerImage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <!-- android:background="#FC8C00" -->
        <ImageView
            android:layout_width="280dp"
            android:layout_height="140dp"
            android:foregroundGravity="top"
            android:src="@drawable/ic_abstract" />
    </LinearLayout>

    <android.support.v7.widget.RecyclerView
        android:layout_below="@+id/containerDrawerImage"
        android:id="@+id/drawer_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </android.support.v7.widget.RecyclerView>

</RelativeLayout>