如何将片段之间的数据传递到适配器

Question

请参阅所有有关此信息的文章，并在所有情况下都能理解有关通过界面从适配器到片段的传递数据的解释，但我使用它，但是我的问题是如何将数据从片段传递到适配器？如何从这些数据中传递数据的价值？

这是我的适配器：

public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder> {
    private Context context;
    List<jsonContent> jcontent;
    private AdapterCallback callback;
    private String etpass;

    public DataAdapter(Context context, List<jsonContent> jcontent, AdapterCallback callback) {
        this.context=context;
        this.jcontent=jcontent;
        this.callback=callback;
    }
    @Override
    public DataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
       View view ;
        if(i == R.layout.card_row) {
            view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_row, viewGroup, false);
        }else {
            view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.button_card, viewGroup, false);
        }
        return new ViewHolder(view);
    }
    @Override
    public void onBindViewHolder(final ViewHolder viewHolder, final int i) {
        if(i == jcontent.size()) {
            viewHolder.buttonnext.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    jcontent.removeAll(jcontent);
                    callback.MethodCallbacknext();
                }
            });
            viewHolder.buttonprev.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    jcontent.removeAll(jcontent);
                    callback.MethodCallbackprev();
                }
            });
            viewHolder.go.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    etpass=String.valueOf(viewHolder.editText.getText());
                    maghalat f1 = new maghalat ();
                    Bundle args1 = new Bundle();
                    args1.putString("sag",etpass);
                    f1.setArguments(args1);
                    callback.MethodCallbackgo();
                }
            });
            viewHolder.cardView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                }
            });
            viewHolder.pages.setText(Integer.toString(jcontent.get(i - 1).pages));

        }
        else {
            viewHolder.title.setText(jcontent.get(i).title);
            viewHolder.title.setTypeface(viewHolder.title.getTypeface(), Typeface.BOLD);
            Picasso.with(context).load(jcontent.get(i).imgurl).resize(300, 400).into(viewHolder.imageView);
        }
    }
    @Override
    public int getItemCount() {
            return jcontent.size()+1;
    }
    @Override
    public int getItemViewType(int position) {
        return (position == jcontent.size()) ? R.layout.button_card : R.layout.card_row;
    }

    public class ViewHolder extends RecyclerView.ViewHolder{
        private TextView title,pages,current;
        private ImageView imageView;
        private Button buttonnext,buttonprev,go;
        private CardView cardView;
        private EditText editText;

        public ViewHolder(final View view) {
            super(view);

           title = (TextView)view.findViewById(R.id.post_title);
            imageView=(ImageView)view.findViewById(R.id.img);
            buttonnext =(Button)view.findViewById(R.id.next);
            buttonprev=(Button)view.findViewById(R.id.prev);
            go=(Button)view.findViewById(R.id.go);
            editText=(EditText)view.findViewById(R.id.et_go_page);
            cardView=(CardView)view.findViewById(R.id.cvv);
            pages=(TextView)view.findViewById(R.id.number_pages);
            current=(TextView)view.findViewById(R.id.current);
}
}
}

这是我的界面：

public interface AdapterCallback {
    void MethodCallbackgo();
    void MethodCallbacknext();
    void MethodCallbackprev();
}

这是我的片段：

public class maghalat extends Fragment {
    private View myFragmentView;
    private RecyclerView recyclerView;
    private DataAdapter adapter;
    private String TAG = MainActivity.class.getSimpleName();
    private ProgressDialog pDialog;
    List<jsonContent> listcontent=new ArrayList<>();
    public int dog=1;
    public String url = "http://memaraneha.ir/category/%d9%85%d9%82%d8%a7%d9%84%d8%a7%d8%aa/page/"+String.valueOf(dog)+"/?json=get_posts";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        myFragmentView = inflater.inflate(R.layout.maghalat, container, false);

        if(isNetworkConnected()) {
            asyncRun();
        }else
        {
            Toast.makeText(getActivity().getApplicationContext(), "دستگاه شما به اینترنت متصل نیست!", Toast.LENGTH_LONG).show();
        }
        return myFragmentView;
    }
    public void asyncRun(){
       new GetContacts().execute();
    }
    public class GetContacts extends AsyncTask<Void, Void, Void> {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Showing progress dialog
            pDialog = new ProgressDialog(getActivity());
            pDialog.setMessage("Please wait...");
            pDialog.setCancelable(false);
            pDialog.show();
        }
        @Override
        protected Void doInBackground(Void... arg0) {
            HttpHandler sh = new HttpHandler();

            // Making a request to url and getting response
            String jsonStr = sh.makeServiceCall(url);

            Log.e(TAG, "Response from url: " + jsonStr);
            if (jsonStr != null) {
                try {
                    JSONObject jsonObj = new JSONObject(jsonStr);

                    int id=jsonObj.getInt("pages");

                    JSONArray posts = jsonObj.getJSONArray("posts");
                    for (int i = 0; i < posts.length(); i++) {
                        JSONObject c = posts.getJSONObject(i);
                        jsonContent jsonContent=new jsonContent();
                        jsonContent.title=c.getString("title");
                        //img
                        JSONObject post_img=c.getJSONObject("thumbnail_images");
                        for (int j=0;j<post_img.length();j++)
                        {
                            JSONObject v=post_img.getJSONObject("mom-portfolio-two");
                            jsonContent.imgurl=v.getString("url");
                        }
                        jsonContent.pages=id;
                        listcontent.add(jsonContent);
                    }
                } catch (final JSONException e) {
                    Log.e(TAG, "Json parsing error: " + e.getMessage());
                    getActivity().runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(getActivity().getApplicationContext(),
                                    "Json parsing error: " + e.getMessage(),
                                    Toast.LENGTH_LONG)
                                    .show();
                        }
                    });
                }
            } else {
                Log.e(TAG, "Couldn't get json from server.");
                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getActivity().getApplicationContext(),
                                "Couldn't get json from server. Check LogCat for possible errors!",
                                Toast.LENGTH_LONG)
                                .show();
                    }
                });
            }
            return null;
        }
        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            pDialog.dismiss();
            recyclerView=(RecyclerView)myFragmentView.findViewById(R.id.recycler_view);
            recyclerView.setHasFixedSize(true);
            RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity().getApplicationContext());
            recyclerView.setLayoutManager(layoutManager);
            adapter=new DataAdapter(getActivity(), listcontent, new AdapterCallback() {
                @Override
                public void MethodCallbackgo() {
                    String gg;
                    Bundle extras = getArguments();
                    gg = extras.getString("sag");
                    dog= Integer.parseInt(gg);
                    url = "http://memaraneha.ir/category/%d9%85%d9%82%d8%a7%d9%84%d8%a7%d8%aa/page/"+String.valueOf(dog)+"/?json=get_posts";
                    new GetContacts().execute();
                }
                @Override
                public void MethodCallbacknext() {
                    dog+=1;
                    url = "http://memaraneha.ir/category/%d9%85%d9%82%d8%a7%d9%84%d8%a7%d8%aa/page/"+String.valueOf(dog)+"/?json=get_posts";
                    new GetContacts().execute();
                }
                @Override
                public void MethodCallbackprev() {
                    if (dog!=1)
                    {
                        dog-=1;
                        url = "http://memaraneha.ir/category/%d9%85%d9%82%d8%a7%d9%84%d8%a7%d8%aa/page/"+String.valueOf(dog)+"/?json=get_posts";
                        new GetContacts().execute();
                    }else{
                        Toast.makeText(getActivity().getApplicationContext(),"این اولین صفحه است",Toast.LENGTH_SHORT).show();
                    }
                }
            });
            recyclerView.setAdapter(adapter);
        }
    }

    private boolean isNetworkConnected() {
        ConnectivityManager cm = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo ni = cm.getActiveNetworkInfo();
        if (ni == null) {
            // There are no active networks.
            return false;
        } else
            return true;
    }
   }

想要go.setOnClickListener中的内部适配器获取编辑文本值并将其传递给public void MethodCallbackgo() {中的片段，但没有工作。另一个问题是如何将狗变量值在片段内部发送到适配器？

Answer 1

如果正确理解，则要将来自回调方法调用的数据传递给接口实现。

使用参数

void MethodCallbackgo(String data);

将其传回去

etpass=String.valueOf(viewHolder.editText.getText());
callback.MethodCallbackgo(etpass);

另外：建议将异步性重写以将URL作为参数。URL不需要是片段的成员变量

 @Override
public void MethodCallbackgo(String data) {
    // here you have data 
    //use it ...
    new GetContacts().execute(url); // pass url here, for example 
}

---

这无能为力，只能创建一个从未显示的全新片段

maghalat f1 = new maghalat ();
Bundle args1 = new Bundle();
args1.putString("sag",etpass);
f1.setArguments(args1);

---

就个人而言，我认为适配器不应控制页码。片段（或其他一些类）应包含上一个/下一个/GO按钮操作，并相应地更新适配器。您对唯一目的的课程赋予了"太多责任"，就是在列表中显示数据。

Answer 2

在您的适配器中声明这一点

private AdapterCallback mAdaptercallback;

在适配器中创建一种方法

public void setAdapterCallback(AdapterCallback  adaptercallback){
    this.mAdaptercallback = adaptercallback;
}

在您的片段中确实喜欢

    adapter.setAdapterCallback(new DataAdapter.AdapterCallback() {

          @Override
            public void MethodCallbackgo() {
                String gg;
                Bundle extras = getArguments();
                gg = extras.getString("sag");
                dog= Integer.parseInt(gg);
                url = "http://memaraneha.ir/category/%d9%85%d9%82%d8%a7%d9%84%d8%a7%d8%aa/page/"+String.valueOf(dog)+"/?json=get_posts";
                new GetContacts().execute();
            }
            @Override
            public void MethodCallbacknext() {
                dog+=1;
                url = "http://memaraneha.ir/category/%d9%85%d9%82%d8%a7%d9%84%d8%a7%d8%aa/page/"+String.valueOf(dog)+"/?json=get_posts";
                new GetContacts().execute();
            }
            @Override
            public void MethodCallbackprev() {
                if (dog!=1)
                {
                    dog-=1;
                    url = "http://memaraneha.ir/category/%d9%85%d9%82%d8%a7%d9%84%d8%a7%d8%aa/page/"+String.valueOf(dog)+"/?json=get_posts";
                    new GetContacts().execute();
                }else{
                    Toast.makeText(getActivity().getApplicationContext(),"این اولین صفحه است",Toast.LENGTH_SHORT).show();
                }
            }
        });

我希望这能解决您的问题