Я пытаюсь создать пользовательский навигационный ящик.то, что я сделал, создал Drawerlayout с рециркуляцией в нем.
когда я запускаю приложение, это то, что я получаю 
У кого-нибудь естьидея, что происходит?
activity_navigation_drawer.xml
<android.support.v4.widget.DrawerLayout 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:id="@+id/dd_drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".NavigationDrawerActivity">
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.v7.widget.RecyclerView
android:id="@+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="left|start"
android:background="@color/blue"
android:choiceMode="singleChoice"
android:divider="@null"
android:scrollbars="vertical"
app:layoutManager="android.support.v7.widget.LinearLayoutManager" />
</android.support.v4.widget.DrawerLayout>
knifeItem.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/d_item"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/menu_item_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_person" />
<TextView
android:id="@+id/menu_item_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textColor="@color/white" />
</RelativeLayout>
DrawerAdapter
public class DrawerAdapter extends RecyclerView.Adapter<DrawerAdapter.DrawerItemViewHolder>{
Context mContext;
int layoutResID;
ArrayList<DrawerItem> menuList;
onItemClickListner mListner;
public interface onItemClickListner{
void onItemClick(int position);
}
public class DrawerItemViewHolder extends RecyclerView.ViewHolder{
TextView itemTitle;
onItemClickListner listner;
public DrawerItemViewHolder(View itemView,onItemClickListner listner) {
super(itemView);
itemTitle=itemView.findViewById(R.id.menu_item_title);
this.listner=listner;
}
}//ViewHolder
public DrawerAdapter(Context context,int resource,ArrayList<DrawerItem> itemList,onItemClickListner listner){
mContext=context;
layoutResID=resource;
menuList=itemList;
mListner=listner;
}
//======================================================================================
@Override
public DrawerItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v=LayoutInflater.from(parent.getContext()).inflate(R.layout.drawer_list_item,parent,false);
DrawerItemViewHolder dvh=new DrawerItemViewHolder(v,mListner);
return dvh;
}
//======================================================================================
@Override
public void onBindViewHolder(DrawerItemViewHolder holder, int position) {
DrawerItem currentItem=menuList.get(position);
holder.itemTitle.setText(currentItem.getTitle());
holder.itemTitle.setTextColor(Color.WHITE);
holder.itemTitle.setBackgroundColor(Color.BLACK);
}
//======================================================================================
@Override
public int getItemCount() {
return 0;
}
}
DrawerItem
public class DrawerItem {
String title;
int imgResID;
public DrawerItem(String title){
this.title=title;
imgResID =0;
}
public String getTitle() {
return title;
}
public int getImgResID() {
return imgResID;
}
}
И в своем классе деятельности я использовал эти методы
oncreate ()
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigation_drawer);
mTitle=mDrawerTitle=getTitle();
mDrawerList = findViewById(R.id.left_drawer);
mDrawerLayout = findViewById(R.id.dd_drawer);
getMenuItems();
//add shadow
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(
this, mDrawerLayout, R.string.navigation_drawer_open, R.string.navigation_drawer_close) {
public void onDrawerClosed(View view) {
getSupportActionBar().setTitle(mTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
getSupportActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}//END OF ON_CREATE
public void getMenuItems(){
//GET MENU ITEMS XML
String menuURL="www.somthing.com/xmldata";
OkHttpClient client=new OkHttpClient();
Request request=new Request.Builder()
.url(menuURL)
.build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
e.printStackTrace();
}
@Override
public void onResponse(Call call, Response response) throws IOException {
if (response.isSuccessful()){
String mResponse = response.body().toString();
String xmm=response.body().string();
System.out.print("\nMenu Items.\n"+xmm+"\n");
xmlData=xmm;
FillMenu(xmlData);
//navigationItemTitle=getTagValue(xmlData,"title");
}
}
});
}//END OF GETMENU ITEMS
public void FillMenu(String xmlData){
try {
DocumentBuilderFactory docFactory=DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder=docFactory.newDocumentBuilder();
InputSource inputSource=new InputSource();
inputSource.setCharacterStream(new StringReader(xmlData));
Document document=documentBuilder.parse(inputSource);
NodeList list=document.getElementsByTagName("Notify");
for(int i=0;i<list.getLength();i++)
{
Node eachNode=list.item(i);
if(eachNode.getNodeType()==Node.ELEMENT_NODE)
{
Element eachElement=(Element) eachNode;
drawerItemList.add(new DrawerItem((eachElement).getElementsByTagName("title").item(0).getTextContent()));
}
}
DrawerAdapter drawerAdapter=new DrawerAdapter(this,R.layout.drawer_list_item,drawerItemList,this);
mDrawerList.setAdapter(drawerAdapter);
}catch (Exception e){
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.navigation_drawer, menu);
return true;
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// If the nav drawer is open, hide action items related to the content view
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
@Override
protected void onPostCreate(@Nullable Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}