RecyclerViewで左または右にスワイプ

Question

スワイプを左または右に追加して、RecyclerViewListに追加しようとしましたが、何が間違っているのか分かりません。私は多くの実用的なソリューションを試しましたが、私のためには機能しません。

これは私のFragment次のとおりです。

import android.app.Fragment; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.v7.widget.DividerItemDecoration; 
import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.LinearSnapHelper; 
import android.support.v7.widget.RecyclerView; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Toast; 

import java.util.ArrayList; 

import de.christian_heinisch.studenttodo.adapters.ToDoListRecyclerViewAdapter; 
import de.christian_heinisch.studenttodo.database.ToDo; 
import de.christian_heinisch.studenttodo.database.ToDoDataSource; 


/** 
* A simple {@link Fragment} subclass. 
*/ 
public class ToDoFragment_RV extends Fragment { 


    View rootview; 

    private ToDoDataSource dataSource_todo; 
    private RecyclerView mRecyclerView; 
    private RecyclerView new_mRecyclerView; 
    private RecyclerView.Adapter mAdapter; 
    private RecyclerView.LayoutManager mLayoutManager; 
    private RecyclerView.LayoutManager new_mLayoutManager; 
    private static String LOG_TAG = "RecyclerViewActivity"; 


    public ToDoFragment_RV() { 
     // Required empty public constructor 
    } 




    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     rootview = inflater.inflate(R.layout.fragment_to_do_rv, container, false); 

     mRecyclerView = (RecyclerView) rootview.findViewById(R.id.rv); 
     mRecyclerView.setHasFixedSize(true); 
     LinearSnapHelper snapHelper = new LinearSnapHelper(); 
     snapHelper.attachToRecyclerView(mRecyclerView); 
     mLayoutManager = new LinearLayoutManager(getContext()); 
     mRecyclerView.setLayoutManager(mLayoutManager); 
     mAdapter = new ToDoListRecyclerViewAdapter(getContext(), getDataSet()); 
     mRecyclerView.setAdapter(mAdapter); 
     mRecyclerView.setOnFlingListener(snapHelper); 

     RecyclerView.ItemDecoration itemDecoration = 
       new DividerItemDecoration(getContext(), LinearLayoutManager.VERTICAL); 
     mRecyclerView.addItemDecoration(itemDecoration); 


     new_mRecyclerView = (RecyclerView) rootview.findViewById(R.id.rv_checked); 
     new_mRecyclerView.setHasFixedSize(true); 
     new_mLayoutManager = new LinearLayoutManager(getContext()); 
     new_mRecyclerView.setLayoutManager(new_mLayoutManager); 
     mAdapter = new ToDoListRecyclerViewAdapter(getContext(), getDataSet_checked()); 
     new_mRecyclerView.setAdapter(mAdapter); 
     RecyclerView.ItemDecoration newitemDecoration = 
       new DividerItemDecoration(getContext(), LinearLayoutManager.VERTICAL); 
     new_mRecyclerView.addItemDecoration(newitemDecoration); 

    //  setHasOptionsMenu(true); 

     FloatingActionButton fab = (FloatingActionButton) rootview.findViewById(R.id.fbToDoAdd); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       ((StartActivity)getContext()).DialogAddToDO(); 
      } 
     }); 


     return rootview; 
    } 

    private ArrayList<ToDo> getDataSet() { 
     dataSource_todo = new ToDoDataSource(getContext()); 
     dataSource_todo.open(); 

     ArrayList<ToDo> arrayOfToDo = null; 
     arrayOfToDo = dataSource_todo.getToDoForList("false"); 
     dataSource_todo.close(); 

     return arrayOfToDo; 
    } 

    private ArrayList<ToDo> getDataSet_checked() { 
     dataSource_todo = new ToDoDataSource(getContext()); 
     dataSource_todo.open(); 

     ArrayList<ToDo> arrayOfToDo = null; 
     arrayOfToDo = dataSource_todo.getToDoForList("true"); 
     dataSource_todo.close(); 

     return arrayOfToDo; 
    } 


} 

これは私のRecyclerViewAdapter

import android.app.Activity; 
import android.app.Fragment; 
import android.app.FragmentManager; 
import android.app.FragmentTransaction; 
import android.content.Context; 
import android.support.v7.widget.RecyclerView; 
import android.text.format.DateFormat; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.CheckBox; 
import android.widget.TextView; 

import java.util.ArrayList; 
import java.util.Calendar; 
import java.util.Locale; 

import de.christian_heinisch.studenttodo.R; 
import de.christian_heinisch.studenttodo.StartActivity; 
import de.christian_heinisch.studenttodo.ToDoFragment_RV; 
import de.christian_heinisch.studenttodo.database.ToDo; 
import de.christian_heinisch.studenttodo.database.ToDoDataSource; 

/** 
* Created by chris on 16.06.2017. 
*/ 

public class ToDoListRecyclerViewAdapter extends RecyclerView 
     .Adapter<ToDoListRecyclerViewAdapter 
     .DataObjectHolder> { 

    private ArrayList<ToDo> mDataset; 
    private static MyClickListener myClickListener; 
    private Context mContext; 

    ToDoDataSource dataSource = new ToDoDataSource(mContext); 

    public static class DataObjectHolder extends RecyclerView.ViewHolder 
      implements View 
      .OnClickListener { 
     TextView label; 
     TextView dateTime; 
     CheckBox checked; 


     public DataObjectHolder(View itemView) { 
      super(itemView); 

      label = (TextView) itemView.findViewById(R.id.textView_item_todolist_content); 
      dateTime = (TextView) itemView.findViewById(R.id.textView_item_todolist_Date); 
      checked = (CheckBox) itemView.findViewById(R.id.cbToDo); 
      //itemView.setOnClickListener(this); 

     } 

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

    public void setOnItemClickListener(MyClickListener myClickListener) { 
     this.myClickListener = myClickListener; 

    } 

    public ToDoListRecyclerViewAdapter(Context context, ArrayList<ToDo> myDataset) { 
     mDataset = myDataset; 
     mContext = context; 
    } 

    @Override 
    public DataObjectHolder onCreateViewHolder(ViewGroup parent, 
               int viewType) { 
     View view = LayoutInflater.from(parent.getContext()) 
       .inflate(R.layout.item_todolist, parent, false); 

     DataObjectHolder dataObjectHolder = new DataObjectHolder(view); 

     return dataObjectHolder; 
    } 



    @Override 
    public void onBindViewHolder(final DataObjectHolder holder, final int position) { 
     holder.label.setText(mDataset.get(position).getToDo()); 
     holder.dateTime.setText(getDate(mDataset.get(position).isDate())); 
     if(mDataset.get(position).isChecked().equalsIgnoreCase("true")){ 
      holder.checked.toggle(); 
     } 

     holder.itemView.setOnTouchListener(new View.OnTouchListener() { 

      float _xSwipe1; 
      float _xSwipe2; 

      @Override 
      public boolean onTouch(View v, MotionEvent event) 
      { 
       switch (event.getAction()) 
       { 
        case MotionEvent.ACTION_DOWN: 
         _xSwipe1 = event.getX(); 
         break; 

        case MotionEvent.ACTION_UP: 
         _xSwipe2 = event.getX(); 

         float deltaX = _xSwipe2 - _xSwipe1; 

         if (deltaX < 0) 
         { 
          Log.e("SWIPE", "Right to Left swipe"); 
         } 

         else if (deltaX >0) 
         { 
          Log.e("SWIPE", "Left to right swipe"); 
         } 

         break; 
       } 

       return false; 
      } 
     }); 


     // Set onClicklistener 
     holder.label.setOnLongClickListener(new View.OnLongClickListener() { 
      public boolean onLongClick(View view) { 
       System.out.println("Position " + position); 
       edit(mDataset.get(position).getId()); 
       //notifyDataSetChanged(); 
       return false; 
      } 

     }); 

     holder.dateTime.setOnLongClickListener(new View.OnLongClickListener() { 
      public boolean onLongClick(View view) { 
       edit(mDataset.get(position).getId()); 
       return false; 
      } 

     }); 

     holder.checked.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 

       dataSource = new ToDoDataSource(mContext); 
       dataSource.open(); 
       // TODO Auto-generated method stub 
       if(holder.checked.isChecked()){ 
        System.out.println("Checked"); 
        dataSource.updateToDo(mDataset.get(position).getId(), mDataset.get(position).getToDo(), "true", mDataset.get(position).isDate()); 
       }else{ 
        System.out.println("un-Checked"); 
        dataSource.updateToDo(mDataset.get(position).getId(), mDataset.get(position).getToDo(), "false", mDataset.get(position).isDate()); 
       } 
       dataSource.close(); 
      } 
     }); 
    } 



    public void addItem(ToDo dataObj, int index) { 
     mDataset.add(dataObj); 
     notifyItemInserted(index); 
    } 

    public void deleteItem(int index) { 
     mDataset.remove(index); 
     notifyItemRemoved(index); 
    } 

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

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


    private String getDate(long time) { 
     Calendar cal = Calendar.getInstance(Locale.GERMAN); 
     cal.setTimeInMillis(time); 
     String date = DateFormat.format("dd.MM.yyyy", cal).toString(); 
     return date; 
    } 

    private void edit(long l){ 

     ((StartActivity)mContext).DialogEditToDO(l); 

    } 


} 

Answer 1

で戻りtrue場合MotionEvent.ACTION_DOWNであなたの問題を解決することがあります。