Android Recycleview 固定item并且可拖拽

package com.ym.myapplication.adapter; import android.content.Context; import android.content.SharedPreferences; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Toast; import androidx.annotation.NonNull; import androidx.recyclerview.widget.RecyclerView; import com.ym.myapplication.R; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; /** * @Author ldp * @Date 2023/7/24 17:11 * @Description: */ public class RecyclerGridAdapter extends RecyclerView.Adapter<ItemViewHolder> implements ItemTouchHelperAdapter { private ArrayList<String> localDataSet; private SharedPreferences sp; private SharedPreferences.Editor spEditor; final static String SAVE_KEY = "star_sort"; final static String USER_PREFERENCE = "user_preference"; private Context context; private int fixedPosition = 4; // 固定的item3的位置 public List<String> getDataList() { return localDataSet; } public SharedPreferences.Editor getSpEditor() { return spEditor; } public int getFixedPosition() { return fixedPosition; } public RecyclerGridAdapter(ArrayList<String> dataSet, Context context) { String defaultStr = dataSet.toString(); if (context != null) { this.context = context; sp = context.getSharedPreferences(USER_PREFERENCE, Context.MODE_PRIVATE); spEditor = sp.edit(); String saveString = sp.getString(SAVE_KEY, defaultStr); //考虑，若要更改数据源，需要怎么实现 todo String[] splitStr = saveString.replace("[", "").replace("]", "").replace(" ", "").split(","); localDataSet = new ArrayList(); localDataSet.addAll(Arrays.asList(splitStr)); } } @NonNull @Override public ItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_fixed, parent, false); return new ItemViewHolder(view); } @Override public void onBindViewHolder(@NonNull ItemViewHolder holder, int position) { final ItemViewHolder mHolder = holder; final int mPosition = position; holder.getTvName().setText(localDataSet.get(position)); holder.getClContent().setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Toast.makeText(context, "点击了:"+localDataSet.get(mPosition), Toast.LENGTH_SHORT).show(); } }); if (position == fixedPosition) { holder.getClContent().setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View view) { Toast.makeText(context, "点击了", Toast.LENGTH_SHORT).show(); return false; } }); } } @Override public int getItemCount() { return localDataSet.size(); } @Override public void onItemMove(int fromPosition, int toPosition) { // 处理固定的item不移动 if (toPosition == fixedPosition) { return; } //显示item位置部分，还要对list设置数据顺序 保存下来需要写下 if (fromPosition < fixedPosition) { notifyItemMoved(fromPosition, toPosition); if (toPosition > fixedPosition) { notifyItemMoved(fixedPosition - 1, fixedPosition); } } else if (fromPosition > fixedPosition) { notifyItemMoved(fromPosition, toPosition); if (toPosition < fixedPosition) { notifyItemMoved(fixedPosition, fixedPosition+1 ); } } // spEditor.putString(SAVE_KEY, localDataSet.toString()); // spEditor.apply(); } }