RecyclerView將不會顯示我的數據庫內容

Question

我有一個用戶數據庫，我正在嘗試使用RecyclerView來顯示我擁有的每個用戶條目。從我的日誌中，我可以看出，我的RecyclerView甚至沒有被交互。這裏是我把它叫做類：

public class WelcomePage extends AppCompatActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_welcome_page); 

    FragmentManager manager = getFragmentManager(); 
    RecyclerFragment mRecyclerFragment = new RecyclerFragment(); 
    if(mRecyclerFragment == null) { 
     manager.beginTransaction() 
       .add(R.id.recycler, mRecyclerFragment) 
       .commit(); 
    } 
} 
} 

這是我的holder類：

public class RecyclerHolder extends RecyclerView.ViewHolder{ 

private static final String TAG = "RecyclerHolder"; 

private TextView mFullName; 
private TextView mBirthDate; 
private TextView mHomeTown; 
private TextView mBio; 
User mUser; 

RecyclerHolder(View itemView){ 
    super(itemView); 

    mFullName = (TextView)itemView.findViewById(R.id.text_view_name); 
    mBirthDate = (TextView)itemView.findViewById(R.id.text_view_birthday); 
    mHomeTown = (TextView)itemView.findViewById(R.id.text_view_hometown); 
    mBio = (TextView)itemView.findViewById(R.id.text_view_bio); 

public void bind(User user) { 
    mUser = user; 
    mFullName.setText(user.getFullName()); 
    mBirthDate.setText(user.getBirthDate().toString()); 
    mHomeTown.setText(user.getHomeTown()); 
    mBio.setText(user.getBio()); 
} 

} 

這裏是我的適配器類：

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerHolder> { 
private ArrayList<User> mUsers; 

public RecyclerAdapter(ArrayList<User> user) { 
    mUsers = user; 
} 

@Override 
public RecyclerHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    LayoutInflater inflater = LayoutInflater.from(parent.getContext()); 
    View view = inflater.inflate(R.layout.view_recycler, parent, false); 
    RecyclerHolder holder = new RecyclerHolder(view); 
    return holder; 
} 

@Override 
public void onBindViewHolder(RecyclerHolder holder, int position){ 
    holder.bind(mUsers.get(position)); 

} 

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

} 

這裏是我的片段類：

public class RecyclerFragment extends Fragment { 

private RecyclerView mRecyclerView; 
DBCursorWrapper db; 

public RecyclerFragment() { 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.fragment_recycler, container, false); 
    mRecyclerView = (RecyclerView)view.findViewById(R.id.recycler); 
    mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); 

    RecyclerAdapter adapter = new RecyclerAdapter(db.getUserList()); 
    mRecyclerView.setAdapter(adapter); 

    return view; 

} 

} 

這是我的公民的XML DER：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:orientation="vertical" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:id="@+id/view_recycler"> 

<TextView 
    android:id="@+id/text_view" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:gravity="center" 
    /> 


</LinearLayout> 

這裏是我的XML我的片段：

<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/recycler" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="com.csc214.just4kas.project02.RecyclerFragment"> 

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

這裏是我的XML的，我打電話給我的RecyclerView：

<FrameLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/frame_layout_recycler_view" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="com.csc214.just4kas.project02.WelcomePage"> 

</FrameLayout> 

的getUserList（）已單獨測試和完美的作品！

任何幫助將超級讚賞！我只想要一個數據庫中所有內容的RecyclerView！謝謝！

Answer 1

我想你可能會使用錯誤的佈局，當你將其添加到主要活動。嘗試（R.id.frame_layout_recycler_view）或者R.id.recycler。

或者在此上下文中使用數據庫時可能存在問題。