Question

如何将数据从recyclerview适配器传递到片段，以及我必须在片段中编写代码以接收数据。我已经检查了本网站中的链接，但不幸的是无法获取正确的代码。下面是代码

ExampleAdapter.Java

public class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {
    private ArrayList<ExampleItem> mExampleList;
    @NonNull
    @Override
    public ExampleViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View v=LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.example_item,viewGroup,false);
        ExampleViewHolder evh=new ExampleViewHolder(v);
        return evh;
    }
    @Override
    public void onBindViewHolder(@NonNull ExampleViewHolder exampleViewHolder, int i) {
        final ExampleItem currentItem=mExampleList.get(i);
        exampleViewHolder.mTextView.setText(currentItem.getmText());
        exampleViewHolder.mTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // pass the data to the fragment
            }
        });
    }
    @Override
    public int getItemCount() {
        return mExampleList.size();
    }
    public static class ExampleViewHolder extends RecyclerView.ViewHolder {
        public TextView mTextView;
        public ExampleViewHolder(@NonNull View itemView) {
            super(itemView);
            mTextView=itemView.findViewById(R.id.texttitle);
        }
    }
    public ExampleAdapter(ArrayList<ExampleItem> exampleList){
              this.mExampleList=exampleList;
}
}

Answer 1

您有两个选择；

使用GET my_index/mydocs/_search { "query": { "match": { "name": "gb" } } } ：

SharedPreferences

_获得：

Context myContext = exampleViewHolder.itemView.getContext()

SharedPreferences.Editor editor = getSharedPreferences("DeviceToken", MODE_PRIVATE).edit();
editor.putString("YourKeyNameHere", currentItem.getmText()); // or add toString() after if needed
editor.apply();

使用SharedPreferences prefs = getSharedPreferences("DeviceToken", MODE_PRIVATE); String deviceToken = prefs.getString("YourKeyNameHere", null); // get it here ：（如果要在传递数据时启动另一个Intent）

Activity

_获得：

Intent intent = new Intent(myContext , SignoutActivity.class);
intent.putExtra("EXTRA_TEXT", currentItem.getmText());
startActivity(intent); // if needed, add myContext before starting myContext.startActivity...

Answer 2

您的片段中包含“ ClickListener”。

例如。

@Override
public void onResume(){
    super.onResume();
    ((ExampleAdapter) mAdapter).onItemClick(new RecyclerViewItemClick() {
        @Override
        public void onItemClick(int position, View v) {
            //to do. ArrayList<> data.get(position).getYourItem();
        }
    });
}

并且您必须创建接口RecyclerViewItemClick.java

public interface RecyclerViewItemClick {
    public void onItemClick(int position, View v);
}

最后。 ExampleAdapter.java添加

public void onItemClick(RecyclerViewItemClick mclick){
   this.myClickListener = mclick;
}

ExampleViewHolder方法添加

@Override
public void onClick(View v) {
    myClickListener.onItemClick(getAdapterPosition(), v);
    notifyDataSetChanged();
}

希望您能解决此问题。谢谢。

Answer 3

具有一个IDataCollector界面。在Fragment中实现她，将Fragment引用作为构造函数参数，并在适配器内部使用

public interface IDataCollector {
    void setText(String text);
    void setAnything(Object anything);
}

// Fragment

public class Fragment implements IDataCollector {

    private void initView() {
        // Add this as a parameter
        ExampleAdapter adapter = new ExampleAdapter(... , this);
    }

    @Override
    public void setText(String text){
        this.textField = text;
    }

    @Override
    public void setText(Object anything){
        this.anything = anything;
    }
}

// Adapter code

// Constructor, parameters ommited
public ExampleAdapter(...., IDataCollector dataCollector) {
    this.dataCollector = dataCollector;
}

@Override
public void onBindViewHolder(@NonNull ExampleViewHolder exampleViewHolder, int i) {
    final ExampleItem currentItem=mExampleList.get(i);
    exampleViewHolder.mTextView.setText(currentItem.getmText());
    exampleViewHolder.mTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dataCollector.setText(((TextView)v.findViewById(R.id.label1)).getText());
            ....
        }
    });
}

Answer 4

您可以通过将回调附加到适配器来传递数据：

创建界面：

interface OnTextClickListener {
    void onTextClick(ExampleItem data);
}

删除回调：

class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {

    List<ExampleItem> items;
    OnTextClickListener listener;

    ExampleAdapter(List<ExampleItem> items, OnTextClickListener listener) {
        this.items = items;
        this.listener = listener;
    }

    @Override
    public void onBindViewHolder(ExampleViewHolder viewHolder, int position) {
        viewHolder.textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Say you want to pass an ExampleItem back to the fragment...
                ExampleItem data = items.get(position);
                listener.onTextClick(data);
            }
        });
    }
}

使用界面实现片段：

class YourFragment extends Fragment implements OnTextClickListener {

    public onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        recyclerView.setAdapter(new ExampleAdapter(this));
    }

    void onTextClick(ExampleItem data) {
        // Now you can do however you want with the data here...
        Toast.makeText(getActivity(), "Got: " + data, Toast.LENGTH_SHORT).show()
    }
}

Answer 5

通过界面，您可以解决此问题 1.在适配器中创建一个接口，添加所需的方法 2.随时在适配器中调用这些方法 3.在片段或活动中实现接口，将上下文传递给适配器

如何将数据从Recyclerview适配器传递或发送到片段

5 个答案: