<错误>

1.

package com.multak.cookaraclient.adapter;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.multak.cookaraclient.R;
import com.multak.cookaraclient.info.MusicInfo;

import java.util.List;

/**
 * Created by guoxw on 2017/6/19.
 */

public class ProRecycleViewAdapter extends   RecyclerView.Adapter<ProRecycleViewAdapter.ViewHolder> implements View.OnClickListener {

    private static final String TAG = "ProRecycleViewAdapter";
    /**
     *
     */
    private ProRecycleViewAdapter.OnItemClickListener mOnItemClickListener=null;
    List<MusicInfo> data;
    Context context;
    int type;
    /**
     * 点击的条目
     */
    int num=-2;
    public void textSize(int type){
        this.type=type;
    }

    public ProRecycleViewAdapter(List<MusicInfo> data, Context context) {
        this.data = data;
        this.context = context;
    }

    @Override
    public ProRecycleViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View view= LayoutInflater.from(context).inflate(R.layout.prorecycleview_item_layout,parent,false);
        final ProRecycleViewAdapter.ViewHolder holder=new ProRecycleViewAdapter.ViewHolder(view);

        /**
         *
         */
        view.setOnClickListener(this);
        return holder;

    }

    @Override
    public void onBindViewHolder(ProRecycleViewAdapter.ViewHolder holder, int position) {

        MusicInfo musicInfo=data.get(position);
        holder.textView_SongName.setText(musicInfo.getMusicName());
        holder.textView_SongSinger.setText(musicInfo.getMusicSinger());
        int x=position+1;
        holder.textView_no.setText(""+x);
        if(type==2){
            holder.textView_SongName.setTextColor(context.getResources().getColor(R.color.colorHomeText));
            holder.textView_SongSinger.setTextColor(context.getResources().getColor(R.color.colorHomeText));
        }else if(type==1){
            holder.textView_SongName.setTextColor(context.getResources().getColor(R.color.colorSingerName));
            holder.textView_SongSinger.setTextColor(context.getResources().getColor(R.color.colorSingerName));

        }

        if(num==position){

            Log.d(TAG, "onBindViewHolder: NUM: "+num);
            Log.d(TAG, "onBindViewHolder: Position: "+position);
            holder.textView_SongName.setTextColor(context.getResources().getColor(R.color.colorAccent));
        }
　　　　else {
　　　　　　　　//恢复
　　　　　　}

        /**
         *
         */
        holder.itemView.setTag(position);
    }

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

    class ViewHolder extends RecyclerView.ViewHolder{
        View viewItem;
        TextView textView_no;
        TextView textView_SongName,textView_SongSinger;
        public ViewHolder(View itemView) {
            super(itemView);
            viewItem=itemView;
            textView_SongName= (TextView) itemView.findViewById(R.id.textView_SongName);
            textView_SongSinger= (TextView) itemView.findViewById(R.id.textView_SongSinger);
            textView_no= (TextView) itemView.findViewById(R.id.textView_no);
        }

    }

    /**
     *
     * @param
     */
    public static interface OnItemClickListener{
        void onItemClick(View view,int position);

    }
    /**
     *
     * @param v
     */
    @Override
    public void onClick(View v) {

        if(mOnItemClickListener != null) {
            mOnItemClickListener.onItemClick(v,(int)v.getTag());
        }
    }

    /**
     *
     * @param listener
     */
    public void setOnItemClickListener(ProRecycleViewAdapter.OnItemClickListener listener) {
        this.mOnItemClickListener=listener;
    }

    public void setItemClickColor(int num){
        this.num=num;
    }

}

2.

package com.multak.cookaraclient.fragment;

import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.TextView;

import com.multak.cookaraclient.R;
import com.multak.cookaraclient.adapter.ProRecycleViewAdapter;
import com.multak.cookaraclient.info.MusicInfo;
import com.multak.cookaraclient.info.ToastUtils;

import java.util.ArrayList;
import java.util.List;

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

    private static final String TAG = "ProFragment";
    View view;
    RecyclerView recyclerView;
    ProRecycleViewAdapter proRecycleAdapter;
    List<MusicInfo>data=new ArrayList<>();
    public ProFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        view=inflater.inflate(R.layout.fragment_pro, container, false);
        recyclerView= (RecyclerView) view.findViewById(R.id.recycleView_Pro);
        recyclerView.setOverScrollMode(View.OVER_SCROLL_NEVER);
        final Context context=getActivity();
        addMusicInfo();
        LinearLayoutManager linearLayoutManager=new LinearLayoutManager(context);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recyclerView.setLayoutManager(linearLayoutManager);
        proRecycleAdapter=new ProRecycleViewAdapter(data,context);
        recyclerView.setAdapter(proRecycleAdapter);
        proRecycleAdapter.setOnItemClickListener(new ProRecycleViewAdapter.OnItemClickListener() {
           @Override
           public void onItemClick(View view, int position) {

                       ToastUtils.showtoast(getActivity(),""+position);
                       Log.d(TAG, "onBindViewHolder: TOAST: "+position);
                       proRecycleAdapter.setItemClickColor(position);
                       proRecycleAdapter.notifyDataSetChanged();
           }
       });
        return view;
    }

    public  void addMusicInfo(){
        data.add(new MusicInfo("我知道","阎韦伶"));
        data.add(new MusicInfo("千里之外","周杰伦"));
        data.add(new MusicInfo("同桌的你","老狼"));
        data.add(new MusicInfo("我知道","阎韦伶"));
        data.add(new MusicInfo("千里之外","周杰伦"));
        data.add(new MusicInfo("同桌的你","老狼"));
        data.add(new MusicInfo("我知道","阎韦伶"));
        data.add(new MusicInfo("千里之外","周杰伦"));
        data.add(new MusicInfo("同桌的你","老狼"));
        data.add(new MusicInfo("我知道","阎韦伶"));
        data.add(new MusicInfo("千里之外","周杰伦"));
        data.add(new MusicInfo("同桌的你","老狼"));
        data.add(new MusicInfo("我知道","阎韦伶"));
        data.add(new MusicInfo("千里之外","周杰伦"));
        data.add(new MusicInfo("同桌的你","老狼"));
        data.add(new MusicInfo("我知道","阎韦伶"));
        data.add(new MusicInfo("千里之外","周杰伦"));
        data.add(new MusicInfo("同桌的你","老狼"));

    }

    public void selectOperate(final int posi,View view){

        View contentView = LayoutInflater.from(getActivity()).inflate(R.layout.popup_song, null);
        final PopupWindow popupWindow = new PopupWindow(contentView,600, LinearLayout.LayoutParams.WRAP_CONTENT, true);
        WindowManager manager = (WindowManager) getActivity().getSystemService(Context.WINDOW_SERVICE);
        TextView textView_xiai= (TextView) contentView.findViewById(R.id.textView_xiai);
        TextView textView_yuyue= (TextView) contentView.findViewById(R.id.textView_yuyue);
        TextView textView_zhiding= (TextView) contentView.findViewById(R.id.textView_zhiding);
        TextView textView_bofang= (TextView) contentView.findViewById(R.id.textView_bofang);
        textView_xiai.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ToastUtils.showtoast(getActivity(),"喜爱操作");
                popupWindow.dismiss();
            }
        });
        textView_yuyue.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ToastUtils.showtoast(getActivity(),"预约操作");
                popupWindow.dismiss();
            }
        });
        textView_zhiding.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ToastUtils.showtoast(getActivity(),"置顶操作");
                popupWindow.dismiss();
            }
        });
        textView_bofang.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ToastUtils.showtoast(getActivity(),"播放操作");
                popupWindow.dismiss();
            }
        });
        int popupWidth = view.getMeasuredWidth();
        int popupHeight = view.getMeasuredHeight();
        int[] location = new int[2];
        view.getLocationOnScreen(location);
        int x = location[0];
        int y = location[1];

        Log.d(TAG, "selectOperate: 坐标："+x+"&&"+y);
        popupWindow.setTouchable(true);
        popupWindow.setBackgroundDrawable(new BitmapDrawable());
        popupWindow.setOutsideTouchable(true);
        popupWindow.showAtLocation(view, Gravity.TOP|Gravity.LEFT, x+200, y+140);
        popupWindow.showAsDropDown(view);
        view.setAlpha(1f);
    }
}

3.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="80dp">
    <TextView
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:textSize="@dimen/songnumbersize"
        android:gravity="center"
        android:textColor="@color/colorSingerName"
        android:id="@+id/textView_no"/>
    <LinearLayout
        android:layout_marginLeft="@dimen/imagemagintext"
        android:layout_height="50dp"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:orientation="vertical">
        <TextView
            android:id="@+id/textView_SongName"
            android:layout_width="match_parent"
            android:layout_height="30dp"
            android:paddingTop="5dp"
            android:gravity="center_vertical"
            android:textColor="@color/colorSongName"
            android:textSize="@dimen/songnamesize"/>
        <TextView
            android:id="@+id/textView_SongSinger"
            android:layout_width="match_parent"
            android:layout_height="20dp"
            android:gravity="center_vertical"
            android:textColor="@color/colorSongName"
            android:textSize="@dimen/songsingersize"/>
    </LinearLayout>
</LinearLayout>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.multak.cookaraclient.fragment.ProFragment">

    <!-- TODO: Update blank fragment layout -->
    <android.support.v7.widget.RecyclerView
        android:layout_marginTop="10dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:id="@+id/recycleView_Pro"
        android:textSize="23sp"
        android:text="this is a ProFragment" />

</FrameLayout>

错误在于：在if()加入else{} 对item未选中做恢复操作。