RecyclerView nicht scrollen

Question

Ich war für 4 Tage erschöpft, um meine Listview zu scrollen, aber ich konnte nicht und dann schlug jemand RecyclerView zu verwenden, wie ich CoordinatorLayout, also tat ich. Jetzt, nachdem RecyclerView verstanden und implementiert wurde, hat es den gleichen Fehler. es scrollt jetzt nicht was soll ich tun ??? Ich möchte aufgeben. Ich kann nirgendwohin gehen.

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.fragment_contacts_list, container, false); 
    DataBaseOperations hell = new DataBaseOperations(getActivity()); 
    SQLiteDatabase db = hell.getReadableDatabase(); 
    String[] columns = {mDatabase.Tableinfo.ID,mDatabase.Tableinfo.Contacts_phone,mDatabase.Tableinfo.Contacts_name,mDatabase.Tableinfo.Contact_pic}; 
    Cursor Contacts = db.query(mDatabase.Tableinfo.contacts, columns, null, null, null, null, null); 
    Toast.makeText(getContext(),"come on"+Contacts.getCount(),Toast.LENGTH_SHORT).show(); 
    RecyclerView contacts = (RecyclerView) view.findViewById(R.id.contacts); 
    contacts.hasFixedSize(); 
     RecyclerView.LayoutManager llv = new LinearLayoutManager(getContext(),LinearLayoutManager.VERTICAL,false); 
     contacts.setLayoutManager(llv); 
     Context t = getContext(); 
     MyContactsRecyclerViewAdapter lv = new MyContactsRecyclerViewAdapter(Contacts,t); 
     contacts.setAdapter(lv); 

      return view; 
} 

hier ist xml für meine list.xml und es ist in einem Pager sollte ich Code für das auch schreiben ????

<android.support.v7.widget.RecyclerView 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/contacts" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_marginLeft="16dp" 
    android:layout_marginRight="16dp" 
    android:scrollbars="vertical" 
    tools:listitem="@layout/fragment_contacts" /> 

Jede Hilfe wäre willkommen. das ist xml für meine MainActivity.

<android.support.design.widget.CoordinatorLayout  
    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:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true" 
    tools:context=".mainactivity"> 

    <android.support.design.widget.AppBarLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:theme="@style/AppTheme.AppBarOverlay"> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      /> 


     <android.support.design.widget.TabLayout 
      android:id="@+id/tabs" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      app:tabMode="fixed" 
      app:tabGravity="fill" 

      /> 
     <android.support.v4.view.ViewPager 
      xmlns:android="http://schemas.android.com/apk/res/android" 
      android:id="@+id/pager" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:background="@color/backscreen3" 

      /> 


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

    <include layout="@layout/content_main" /> 

<!-- content_main doesn't really have anything. --> 

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

Das ist mein RecyclerAdapter.

public class MyContactsRecyclerViewAdapter extends RecyclerView.Adapter<MyContactsRecyclerViewAdapter.ViewHolder> { 

    private Cursor cursor; 
    private Context mcontext; 
    private View view; 
    public MyContactsRecyclerViewAdapter(Cursor cur, Context con){ 
       cursor = cur; 
       mcontext = con; 
    } 
    @Override 
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     View view = LayoutInflater.from(parent.getContext()) 
       .inflate(R.layout.fragment_contacts, parent, false); 
     return new ViewHolder(view); 
    } 

    @Override 
    public void onBindViewHolder(final ViewHolder holder, int position) { 
      cursor.moveToPosition(position); 
      String nam = cursor.getString(cursor.getColumnIndex(mDatabase.Tableinfo.Contacts_name)); 
      String phon = cursor.getString(cursor.getColumnIndex(mDatabase.Tableinfo.Contacts_phone)); 
      byte[] b = cursor.getBlob(cursor.getColumnIndex(mDatabase.Tableinfo.Contact_pic)); 
      holder.name.setText(nam); 
      holder.phone.setText(phon); 
     if (b==null) { 
      Profile bla = new Profile(); 
     holder.pic.setImageBitmap(bla.getRoundedShape(BitmapFactory.decodeResource(mcontext.getResources(), R.drawable.samplepro),60,60)); 
     } else { 
     holder.pic.setImageBitmap(BitmapFactory.decodeByteArray(b,0,b.length)); 
     } 
    } 


    @Override 
    public int getItemCount() { 
     if(cursor != null){ 
     return cursor.getCount();} 
     return 0 ; 
    } 


    public class ViewHolder extends RecyclerView.ViewHolder { 
     public final View mView; 
     public TextView name; 
     public TextView phone; 
     public ImageView pic; 

     public ViewHolder(View view) { 
      super(view); 
      mView = view; 
      pic = (ImageView) view.findViewById(R.id.image); 
      phone = (TextView) view.findViewById(R.id.phone); 
      name = (TextView)view.findViewById(R.id.name); 

     }}} 

Das ist es. Ich denke, dass alles damit zusammenhängt. Bitte finden ein error.Remember Scroll kommt und verschwindet, aber immer noch kein Scrollen

Answer 1

Scheint, wie Sie in <include layout="@layout/content_main" /> mit diesem ViewPager ein Problem hatte (wie ich in Android Studio Vorschau sehen)

es wie folgt verwenden.:

<android.support.design.widget.CoordinatorLayout 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:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fitsSystemWindows="true" 
tools:context="com.example.umerasif.chattris.Chattris"> 


<android.support.design.widget.AppBarLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:theme="@style/AppTheme"> 


    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" /> 

    <android.support.design.widget.TabLayout 
     android:id="@+id/tabs" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     app:tabGravity="fill" 
     app:tabMode="fixed" /> 

    <android.support.v4.widget.NestedScrollView 
     android:layout_width="match_parent" 
     android:layout_height="470dp" 
     android:layout_weight="1" 
     android:background="@android:color/darker_gray" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior"> 
    <android.support.v4.view.ViewPager 
     android:id="@+id/pager" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     /> 

    </android.support.v4.widget.NestedScrollView> 
</android.support.design.widget.AppBarLayout> 

sollte es jetzt funktionieren.

Answer 2

Das Verschieben des ViewPager außerhalb der AppBarLayout hat mein Problem gelöst.