RecyclerView SearchView etkileşimine kadar doldurulmadı

Question

Özel bir bağdaştırıcıya sahip olan recyclerview ile bir sorun yaşıyorum. Sorun, etkinlik açıldığında geri dönüşümün boş olmasıdır. Kullanıcı SearchView'un metin alanında herhangi bir şey yazdığında, geri dönüşüm görüntülemesi popülasyona girer ve herhangi bir sorun yaşamadan doldurulamaz. Bu sorunu düzeltmek için bazı kodların yerini değiştirmeye çalıştım, ancak başarı yok. Mevcut ve istenen durum ekran görüntülerini kodların altına ekledim. Şimdiden teşekkürler.

AddCourseActivity:

public class AddCourseActivity extends AppCompatActivity{ 

private RecyclerView mRecyclerView; 
private AddCourseAdapter mAdapter; 
private List<AddCourseAdapter.AddCourseModel> mModels; 
SearchView mSearchView; 

@Override 
protected void onCreate(Bundle savedInstance) { 
    super.onCreate(savedInstance); 
    setContentView(R.layout.activity_add_course); 
    Kii.initialize(AppConstants.APP_ID, AppConstants.APP_KEY, 
      AppConstants.APP_SITE); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
    getSupportActionBar().setDisplayShowHomeEnabled(true); 
    mRecyclerView = (RecyclerView) findViewById(R.id.addcourseRecyclerView); 
    mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); 
    String[] courses = new String[]{ 
      "Math119", 
      "Enve101", 
      "Chem107", 
      "Chem229", 
      "Phys105", 
      "Math120"}; 
    mModels = new ArrayList<>(); 
    mAdapter = new AddCourseAdapter(this, mModels); 
    mSearchView = (SearchView) findViewById(R.id.searchView); 
    mSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() { 
     @Override 
     public boolean onQueryTextSubmit(String query) { 
      return false; 
     } 
     @Override 
     public boolean onQueryTextChange(String newText) { 
      final List<AddCourseAdapter.AddCourseModel> filteredModelList = filter(mModels, newText); 
      mAdapter.animateTo(filteredModelList); 
      mRecyclerView.scrollToPosition(0); 
      return true; 
     } 
    }); 
    for (String course: courses) { 
     mModels.add(new AddCourseAdapter.AddCourseModel(course)); 
     mRecyclerView.setAdapter(mAdapter); 
     mAdapter.notifyDataSetChanged(); 
    } 
} 

private List<AddCourseAdapter.AddCourseModel> filter(List<AddCourseAdapter.AddCourseModel> models, String query) { 
    query = query.toLowerCase(); 
    final List<AddCourseAdapter.AddCourseModel> filteredModelList = new ArrayList<>(); 
    for (AddCourseAdapter.AddCourseModel model: models) { 
     final String text = model.getText().toLowerCase(); 
     if (text.contains(query)) { 
      filteredModelList.add(model); 
     } 
    } 
    return filteredModelList; 
} 
} 

AddCourseAdapter:

public class AddCourseAdapter extends RecyclerView.Adapter<AddCourseAdapter.AddCourseViewHolder> { 
private final LayoutInflater mInflater; 
private final List<AddCourseModel> mModels; 
KiiUser user; 
KiiObject object; 
KiiBucket userBucket; 
Context context; 

public AddCourseAdapter(Context context, List<AddCourseModel> models) { 
    mInflater = LayoutInflater.from(context); 
    mModels = new ArrayList<>(models); 
} 

@Override 
public AddCourseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    context = parent.getContext(); 
    final View itemView = mInflater.inflate(R.layout.list_item_add_course, parent, false); 
    user = KiiUser.getCurrentUser(); 
    final String username = user.getUsername(); 
    userBucket = Kii.user().bucket(username); 
    String id = "mycourses"; 
    object = userBucket.object(id); 
    return new AddCourseViewHolder(itemView); 
} 

@Override 
public void onBindViewHolder(final AddCourseViewHolder holder, int position) { 
    final AddCourseModel model = mModels.get(position); 
    holder.bind(model); 
    holder.addButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      final String value = holder.mTextView.getText().toString(); 
      object.refresh(new KiiObjectCallBack() { 
       @Override 
       public void onRefreshCompleted(int token, @NonNull KiiObject object, Exception exception) { 
        object.set(value, true); 
        object.saveAllFields(new KiiObjectCallBack() { 
         @Override 
         public void onSaveCompleted(int token, KiiObject object, Exception exception) { 
          Toast.makeText(context, 
            "Added: " + value, 
            Toast.LENGTH_SHORT) 
            .show(); 
         } 
        }, false); 
       } 
      }); 
      holder.addButton.setVisibility(View.GONE); 
      holder.removeButton.setVisibility(View.VISIBLE); 
     } 
    }); 
    holder.removeButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(final View v) { 
      final String value = holder.mTextView.getText().toString(); 
      object.refresh(new KiiObjectCallBack() { 
       @Override 
       public void onRefreshCompleted(int token, @NonNull KiiObject object, Exception exception) { 
        object.set(value, false); 
        object.saveAllFields(new KiiObjectCallBack() { 
         @Override 
         public void onSaveCompleted(int token, @NonNull KiiObject object, Exception exception) { 
          Toast.makeText(context, 
            "Removed: " + value, 
            Toast.LENGTH_SHORT) 
            .show(); 
         } 
        }, false); 
       } 
      }); 

      holder.addButton.setVisibility(View.VISIBLE); 
      holder.removeButton.setVisibility(View.GONE); 
     } 
    }); 
} 

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

public void animateTo(List<AddCourseModel> models) { 
    applyAndAnimateRemovals(models); 
    applyAndAnimateAdditions(models); 
    applyAndAnimateMovedItems(models); 
} 

private void applyAndAnimateRemovals(List<AddCourseModel> newModels) { 
    for (int i = mModels.size() - 1; i >= 0; i--) { 
     final AddCourseModel model = mModels.get(i); 
     if (!newModels.contains(model)) { 
      removeItem(i); 
     } 
    } 
} 

private void applyAndAnimateAdditions(List<AddCourseModel> newModels) { 
    for (int i = 0, count = newModels.size(); i < count; i++) { 
     final AddCourseModel model = newModels.get(i); 
     if (!mModels.contains(model)) { 
      addItem(i, model); 
     } 
    } 
} 

private void applyAndAnimateMovedItems(List<AddCourseModel> newModels) { 
    for (int toPosition = newModels.size() - 1; toPosition >= 0; toPosition--) { 
     final AddCourseModel model = newModels.get(toPosition); 
     final int fromPosition = mModels.indexOf(model); 
     if (fromPosition >= 0 && fromPosition != toPosition) { 
      moveItem(fromPosition, toPosition); 
     } 
    } 
} 

public AddCourseModel removeItem(int position) { 
    final AddCourseModel model = mModels.remove(position); 
    notifyItemRemoved(position); 
    return model; 
} 

public void addItem(int position, AddCourseModel model) { 
    mModels.add(position, model); 
    notifyItemInserted(position); 
} 

public void moveItem(int fromPosition, int toPosition) { 
    final AddCourseModel model = mModels.remove(fromPosition); 
    mModels.add(toPosition, model); 
    notifyItemMoved(fromPosition, toPosition); 
} 

public class AddCourseViewHolder extends RecyclerView.ViewHolder { 
    private final TextView mTextView; 
    private final ImageButton addButton; 
    private final ImageButton removeButton; 

    public AddCourseViewHolder(View itemView) { 
     super(itemView); 
     mTextView = (TextView) itemView.findViewById(R.id.addCourseTV); 
     addButton = (ImageButton) itemView.findViewById(R.id.addButton); 
     removeButton = (ImageButton) itemView.findViewById(R.id.removeButton); 
    } 

    public void bind(AddCourseModel model) { 
     mTextView.setText(model.getText()); 
    } 
} 

public static class AddCourseModel { 
    private final String mText; 

    public AddCourseModel(String text) { 
     this.mText = text; 
    } 

    public String getText() { 
     return mText; 
    } 
} 
} 

Güncel Başlangıç ​​Devlet:

İstenilen Başlangıç ​​Devlet:

Answer 1

kılıf Adaptör yapıcı olduğunu

Başlangıçta bu anda boştur modeller listesinde (doldurulan yeni ArrayList oluşturmak

public AddCourseAdapter(Context context, List<AddCourseModel> models) { 
    mInflater = LayoutInflater.from(context); 
    mModels = new ArrayList<>(models); 
} 

). Daha sonra, adaptörde oluşturulan değil, arraylist olan ilk modelleri doldurursunuz.

Şunları yapabilirsiniz:

a) Bu

mModels = new ArrayList<>(); 

for (String course: courses) { 
    mModels.add(new AddCourseAdapter.AddCourseModel(course)); 
} 
mAdapter = new AddCourseAdapter(this, mModels); 
mRecyclerView.setAdapter(mAdapter); 

VEYA

benzeyen bu satırlar arasındaki

for (String course: courses) { 
     mModels.add(new AddCourseAdapter.AddCourseModel(course)); 
     mRecyclerView.setAdapter(mAdapter); 
     mAdapter.notifyDataSetChanged(); 
    } 

mModels = new ArrayList<>(); 
mAdapter = new AddCourseAdapter(this, mModels); 

verme taşımak

b) evden ayrıldığında da sadece cevap Oh

public AddCourseAdapter(Context context, List<AddCourseModel> models) { 
     mInflater = LayoutInflater.from(context); 
     mModels = models; 
    }