Android Recyclerview - 如何在片段类中选择“调用CustomAdapter”的项目。我知道如何使用get（getabsoluteadapterposition（）

Question

下面的回收器视图代码正常工作，我可以在RecyCleadapter类中选择哪个回收器视图位置。但是我想知道如何获得在房屋范围的班级中选择的回收站？我试图通过将OnClick侦听器设置为ImageView和TextView来获得位置，但给出了错误作为NULL的引用。基本上，我想在家庭范围的类中使用get（getabsoluteadapterpterposition（），以了解选定的项目并导航到另一个片段。get（getabSoluteDeadapterPosition（）在recyCleadapter.class

binding.recyclerview.recyclerview.setonclicklistener中一直按预期工作，从而在HomeFragment.Class.class.class.class.class.class.cl.clasklistener中工作。没有错误，但是当我单击回收器视图时，没有射击。

NULL引用，这是有意义的。

TXT.SetOnClickListener作为 '''

public class HomeFragment extends Fragment {
    HomeFragmentBinding binding;
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.id.home_fragment, container, false);
        return v;
    }

    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {

        %% some code here %%
        recycleAdapter = new RecycleAdapter(list);

        binding.recyclerview.setAdapter(recycleAdapter);

        TextView txt = (TextView) binding.getRoot().findViewById(R.id.recycler_text);
        txt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(), "Clicked on Image", Toast.LENGTH_SHORT).show();
            }
        });

        binding.recyclerview.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(), "RecyclerView clicked", Toast.LENGTH_SHORT).show();
                Log.d("RecyclerViewclicked", " --- ");
            }
        });

'''

recycleadapter.class

''

public class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.MyViewHolder>{
    RecyclerRowItemsBinding binding;
    List<IconsModel> iconsList;
    public RecycleAdapter(List<IconsModel> iconslist) {
        this.iconsList = iconslist;
    }
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    LayoutInflater inflator = LayoutInflater.from(parent.getContext());
    View v = inflator.inflate(R.layout.recycler_row_items, parent, false);
    MyViewHolder myviewholder = new MyViewHolder(v);
    return myviewholder;
}

@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
    IconsModel iconModel = iconsList.get(position);
    holder.imageView.setImageResource(iconModel.getImageid());
    holder.recyclertext.setText(iconModel.getIconName());
}

@Override
public int getItemCount() {
    //return 20;
    return iconsList.size();
}

class MyViewHolder extends RecyclerView.ViewHolder{
    ImageView imageView;
    TextView recyclertext;
    public MyViewHolder(@NonNull View itemView) {
        super(itemView);

        imageView = itemView.findViewById(R.id.recycler_image);
        recyclertext = itemView.findViewById(R.id.recycler_text);

        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                IconsModel iconModel = iconsList.get(getAbsoluteAdapterPosition());
                Toast.makeText(***itemView.getContext(), "Clicked on "+iconModel.getIconName()***, Toast.LENGTH_SHORT).show();

            }
        });

    }
}

;

}} '''

home_fragment.xml

<androidx.constraintlayout.widget.ConstraintLayout 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"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:layout_editor_absoluteX="1dp"
        tools:layout_editor_absoluteY="1dp"
        app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"/>
</androidx.constraintlayout.widget.ConstraintLayout>

'''' recycler_row.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_gravity="center"
    android:layout_margin="5dp"
    android:orientation="horizontal"
    app:cardCornerRadius="5dp"
    app:cardElevation="5dp"
    app:cardBackgroundColor="@color/home_bg_cardview">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?attr/selectableItemBackground"
        android:backgroundTint="@color/home_bg_cardview"
        android:weightSum="2">

        <ImageView
            android:id="@+id/recycler_image"
            android:layout_width="0dp"
            android:layout_height="120dp"
            android:layout_weight="0.5"
            app:srcCompat="?android:attr/actionModeWebSearchDrawable"
            tools:ignore="ContentDescription" />

        <TextView
            android:id="@+id/recycler_text"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginBottom="29dp"
            android:layout_weight="1.5"
            android:gravity="center"
            android:text="Browse Items"
            android:textAlignment="center"
            android:textSize="24sp" />

    </LinearLayout>
</androidx.cardview.widget.CardView>

Answer 1

如果您想在房屋范围内获取Recyclerview项目的点击事件，

则接口是一个不错的选择

//RecycleAdapter

private RecyclerViewListener  recyclerViewListener  

public void setRecyclerViewListener(RecyclerViewListener  recyclerViewListener){
this.RecyclerViewListener  recyclerViewListener ;
}

public Interface RecyclerViewListener{
void onClick(View  view);
}




class MyViewHolder extends RecyclerView.ViewHolder{
ImageView imageView;
TextView recyclertext;
public MyViewHolder(@NonNull View itemView) {
    super(itemView);

 
    recyclertext = itemView.findViewById(R.id.recycler_text);

    recyclertext .setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
          if(recyclerViewListener  !=null)recyclerViewListener.onClick(v)

        }
    });

}


//HomeFragment

recycleAdapter.setRecyclerViewListener(new RecyclerViewListener{
@Override
        public void onClick(View v) {
        //todo

        }
})

Answer 2

在项目中创建界面类

public interface ItemClick {
public void onClick(IconsModel IconsModel,int pos);
}

接口类别呼叫您的回收使制品

public class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.MyViewHolder> {

Context context;
List<IconsModel> iconsList;
ItemClick click;

public TokensListAdapter(Context context, List<IconsModel> iconsList, ItemClick click) {
    this.context = context;
    this.tokensModelList = tokensModelList;
    this.click = click;
}

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

@Override
public void onBindViewHolder(@NonNull TokensListAdapter.ViewHolder holder, int position) {

    IconsModel iconModel = iconsList.get(position);
    holder.imageView.setImageResource(iconModel.getImageid());
    holder.recyclertext.setText(iconModel.getIconName());


    holder.itemView.setOnClickListener(v -> {
        click.onClick(iconModel,position);
    });
}

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

public class ViewHolder extends RecyclerView.ViewHolder {
    ImageView imageView;
    TextView recyclertext;

    public ViewHolder(@NonNull View itemView) {
        super(itemView);
        imageView = itemView.findViewById(R.id.recycler_image);
        recyclertext = itemView.findViewById(R.id.recycler_text);
    }
  }
}

接口类实现您的片段

public class HomeFragment  extends Fragment implements ItemClick {

//adapter assign
recycleAdapter = new RecycleAdapter(getContext,list,this);

替代方法导入您的片段

@Override
public void onClick(ItemCLick click, int pos) {
 Toast.makeText(getContext(), "Clicked" + pos, Toast.LENGTH_SHORT).show();
}