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我想使导航抽屉使用回收站视图，但主要问题是，当我运行这个时，它只显示第一行与它的图标，标题，而不是任何其他人。我试着用相机图标，但它没有显示除第一行以外的任何内容。Recycler在导航抽屉中查看不显示多个项目
截图输出：
这里是所有的java文件
MainActivity.java
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar=(Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(true);
Nav_drawer nav_drawer=(Nav_drawer)getSupportFragmentManager().findFragmentById(R.id.f1);
nav_drawer.setUp(R.id.f1,(DrawerLayout)findViewById(R.id.activity_main),toolbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
}
Sadapter.java
public class Sadapter extends RecyclerView.Adapter<Sadapter.MyViewHolder> {
private LayoutInflater inflater;
List<Information> data= Collections.emptyList();
public Sadapter(Context context,List<Information> data)
{
inflater=LayoutInflater.from(context);
this.data=data;
}
@Override
public int getItemCount() {
return data.size();
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Information current=data.get(position);
holder.title.setText(current.title);
holder.image.setImageResource(current.iconid);
}
@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;
}
class MyViewHolder extends RecyclerView.ViewHolder{
TextView title;
ImageView image;
public MyViewHolder(View itemView){
super(itemView);
title=(TextView) itemView.findViewById(R.id.tv);
image=(ImageView) itemView.findViewById(R.id.im);
}
}
}
NavigationDrawer.java
public class Nav_drawer extends Fragment {
private RecyclerView recyclerView;
public static final String PREF_NAME="test_pref";
public static final String KEY_USER_LERNED_DRAWER="user_learned_drawer";
private ActionBarDrawerToggle mactionBarDrawerToggle;
private DrawerLayout mdrawerLayout;
private Sadapter sadapter;
private boolean mUserLearnedDrawer;
private boolean mFromSavedInstantState;
public View view;
public Nav_drawer() {
// Required empty public constructor
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mUserLearnedDrawer=Boolean.valueOf(readFromPreferences(getActivity(),KEY_USER_LERNED_DRAWER,"false"));
if (savedInstanceState!=null)
{
mFromSavedInstantState=true;
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View layout=inflater.inflate(R.layout.fragment_nav_drawer, container, false);
recyclerView=(RecyclerView) layout.findViewById(R.id.drawer_list);
sadapter=new Sadapter(getActivity(),getData());
recyclerView.setAdapter(sadapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return layout;
}
public static List<Information> getData(){
List<Information> data=new ArrayList<>();
int[] icons={R.drawable.ic_home_black_18dp,R.drawable.ic_camera_alt_black_18dp};
String[] titles={"Home","Camera"};
for (int i=0;i<titles.length && i<icons.length; i++)
{
Information current= new Information();
current.iconid=icons[i];
current.title=titles[i];
data.add(current);
}
return data;
}
public void setUp(int fragId, DrawerLayout drawerLayout, Toolbar toolbar)
{
view=getActivity().findViewById(fragId);
mdrawerLayout=drawerLayout;
mactionBarDrawerToggle=new ActionBarDrawerToggle(getActivity(),mdrawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close){
@Override
public void onDrawerOpened(View drawerView) {
if (!mUserLearnedDrawer)
{
mUserLearnedDrawer=true;
saveToPreferences(getActivity(),KEY_USER_LERNED_DRAWER,mUserLearnedDrawer+"");
}
getActivity().invalidateOptionsMenu();
}
@Override
public void onDrawerClosed(View drawerView) {
getActivity().invalidateOptionsMenu();
}
};
if (!mUserLearnedDrawer&&!mFromSavedInstantState)
{
mdrawerLayout.openDrawer(view);
}
mdrawerLayout.addDrawerListener(mactionBarDrawerToggle);
mdrawerLayout.post(new Runnable() {
@Override
public void run() {
mactionBarDrawerToggle.syncState();
}
});
}
public void saveToPreferences(Context context,String preferenceName,String preferenceValue)
{
SharedPreferences sharedPreferences=context.getSharedPreferences(PREF_NAME,Context.MODE_PRIVATE);
SharedPreferences.Editor editor=sharedPreferences.edit();
editor.putString(preferenceName,preferenceValue);
editor.apply();
}
public static String readFromPreferences(Context context,String preferenceName,String defaultValue)
{
SharedPreferences sharedPreferences=context.getSharedPreferences(PREF_NAME,Context.MODE_PRIVATE);
return sharedPreferences.getString(preferenceName,defaultValue);
}
}
Information.java
public class Information {
int iconid;
String title;
}
这里是所有的XML文件
mainactivity.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.alshariq.materia.MainActivity">
<include
layout="@layout/app_bar"
android:id="@+id/app_bar"/>
</RelativeLayout>
<fragment
android:layout_width="286dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:id="@+id/f1"
app:layout="@layout/fragment_nav_drawer"
android:name="com.example.alshariq.materia.Nav_drawer"
tools:layout="@layout/fragment_nav_drawer"/>
</android.support.v4.widget.DrawerLayout>
appbar.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="56dp"
android:background="@color/colorPrimary"
android:elevation="4dp"
>
</android.support.v7.widget.Toolbar>
customrow.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/im"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/ic_launcher"
android:padding="8dp"
android:layout_gravity="center_vertical"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dummy Text"
android:padding="8dp"
android:id="@+id/tv"
android:layout_gravity="center_vertical"/>
</LinearLayout>
fragmentnavdrawer.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"
tools:context="com.example.alshariq.materia.Nav_drawer"
android:background="#ffffff"
android:elevation="16dp">
<LinearLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="190dp"
android:background="@color/colorPrimary">
<ImageView
android:layout_width="match_parent"
android:layout_height="77dp"
android:src="@mipmap/ic_launcher"
android:layout_marginTop="26dp"/>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/drawer_list"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_below="@+id/container"
android:layout_alignParentStart="true">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
集'height'。 –
将android：layout_height =“wrap_content”更改为
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