ADD file via upload

LeftAdapter.java

@@ -0,0 +1,132 @@
+package com.example.drink_order_system;
+
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.core.content.ContextCompat;
+import androidx.recyclerview.widget.RecyclerView;
+
+import java.util.ArrayList;
+
+public class LeftAdapter extends RecyclerView.Adapter<LeftAdapter.LeftViewHolder> {
+
+    private ArrayList<LeftBean> mList;
+    private OnItemClickListener onItemClickListener;
+
+    public LeftAdapter( ArrayList<LeftBean> list) {
+        this.mList = list;
+
+    }
+
+    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
+        this.onItemClickListener = onItemClickListener;
+    }
+
+    private LeftBean getItem(int position) {
+        return mList.get(position);
+    }
+
+    @Override
+    public LeftViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        View view= LayoutInflater.from(parent.getContext())
+                .inflate(R.layout.left_list_item,parent,false);
+
+        return new LeftViewHolder(view);
+
+    }
+
+    @Override
+    public void onBindViewHolder(LeftViewHolder holder, int position) {
+        LeftBean target = getItem(holder.getAdapterPosition());
+        if (holder instanceof LeftAdapter.LeftViewHolder) {
+            ((LeftAdapter.LeftViewHolder) holder).bindBean(target);
+            //绑定监听事件
+            holder.itemView.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+
+                    Log.v("onClick",holder.getAdapterPosition()+"\t");
+                    if (onItemClickListener != null){
+                        onItemClickListener.onItemClicked(getItem(holder.getAdapterPosition()).getRightPosition());
+                    }
+                    for (LeftBean bean:mList){
+                        bean.setSelect(false);
+                    }
+                    getItem(holder.getAdapterPosition()).setSelect(true);
+                    notifyDataSetChanged();
+                }
+            });
+        } else {
+            throw new IllegalStateException("Illegal state Exception onBindviewHolder");
+        }
+    }
+
+    @Override
+    public int getItemCount() {
+        return mList.size();
+    }
+
+    public static class LeftViewHolder extends RecyclerView.ViewHolder {
+        private final TextView tvTitle;
+        //private View cl_left_item;
+
+        LeftViewHolder(View itemView) {
+            super(itemView);
+            tvTitle = (TextView) itemView.findViewById(R.id.TV_drink_type);
+        }
+
+        void bindBean(LeftBean target)
+        {
+            tvTitle.setText(target.getTitle());
+            if (target.isSelect()){
+                itemView.setBackgroundColor(ContextCompat.getColor(itemView.getContext(), R.color.gray));
+            } else {
+                itemView.setBackgroundColor(ContextCompat.getColor(itemView.getContext(), R.color.white));
+            }
+        }
+    }
+
+    interface OnItemClickListener {
+        void onItemClicked(int rightPosition);
+    }
+
+    public void setCurrentPosition(int rightPosition){
+        for (int i = 0; i < mList.size(); i++){
+            LeftBean bean = mList.get(i);
+            if(i < mList.size()-1)
+            {
+                LeftBean nextBean = mList.get(i+1);
+                if (bean.getRightPosition() <= rightPosition && rightPosition < nextBean.getRightPosition()){
+                    bean.setSelect(true);
+                } else {
+                    bean.setSelect(false);
+                }
+            }
+            else
+            {
+                if(bean.getRightPosition() <= rightPosition)
+                {
+                    bean.setSelect(true);
+                }
+                else {
+                    bean.setSelect(false);
+                }
+            }
+        }
+        notifyDataSetChanged();
+    }
+
+    public String getCurrentTitle(){
+        String currentTitle = "";
+        for (LeftBean bean:mList){
+            if (bean.isSelect()){
+                currentTitle = bean.getTitle();
+                break;
+            }
+        }
+        return currentTitle;
+    }
+}