RecyclerView的基本使用

1  <android.support.v7.widget.RecyclerView
2         android:id="@+id/recycleview"
3         android:paddingLeft="10dp"
4         android:paddingRight="10dp"
5         android:layout_width="match_parent"
6         android:layout_height="match_parent"
7         android:gravity="center">
8     </android.support.v7.widget.RecyclerView>

1   recyclerView = (RecyclerView)findViewById(R.id.recycleview);
2   recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 4)) ;   //gridView网格布局
3   recyclerView.setLayoutManager(new LinearLayoutManager(this));              //listView线性布局

  1 package com.yiba.files.adapter;
  2 
  3 import android.content.Context;
  4 import android.graphics.drawable.BitmapDrawable;
  5 import android.support.v7.widget.RecyclerView;
  6 import android.view.LayoutInflater;
  7 import android.view.View;
  8 import android.view.ViewGroup;
  9 import android.widget.ImageView;
 10 import android.widget.RelativeLayout;
 11 import android.widget.TextView;
 12 
 13 import com.yiba.files.R;
 14 import com.yiba.files.model.DataItem;
 15 import com.yiba.files.util.DensityUtils;
 16 import com.yiba.files.util.DeviceUtils;
 17 
 18 import java.util.List;
 19 
 20 /**
 21  * Created by ${zyj} on 2016/1/23.
 22  */
 23 public class AppAdapter extends RecyclerView.Adapter<AppAdapter.MyViewHolder> {
 24     private Context context;
 25     private List<DataItem> list;
 26     private RelativeLayout.LayoutParams params;
 27 
 28     public interface OnItemClickListener {
 29         void onItemClick(View view, int position);
 30     }
 31 
 32     private OnItemClickListener onItemClickListener;
 33 
 34     public void setOnItemClickListener(OnItemClickListener listener) {
 35         onItemClickListener = listener;
 36     }
 37 
 38     public AppAdapter(Context context, List<DataItem> list) {
 39         this.context = context;
 40         this.list = list;
 41     }
 42 
 43     @Override
 44     public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
 45         MyViewHolder holder = new MyViewHolder(LayoutInflater.from(context).inflate(
 46                 R.layout.fragment_app_item, null));
 47         return holder;
 48     }
 49 
 50     @Override
 51     public void onBindViewHolder(final MyViewHolder holder,
 52                                  final int position) {
 53         DataItem info = list.get(position);
 54         String tag = (String) holder.imageView.getTag();
 55 
 56         if (!info.getName().equals(tag)) {
 57             holder.imageView.setImageBitmap(((BitmapDrawable) list.get(position)
 58                     .getImage()).getBitmap());
 59             holder.imageView.setTag(info.getName());
 60         }
 61 
 62         if (info.isSelect()) {
 63             holder.imageView.setAlpha(0.3f);
 64             holder.appName.setAlpha(0.3f);
 65             holder.appSize.setAlpha(0.3f);
 66             holder.app_choice.setVisibility(View.VISIBLE);
 67         } else {
 68             holder.imageView.setAlpha(1.0f);
 69             holder.appName.setAlpha(1.0f);
 70             holder.appSize.setAlpha(1.0f);
 71             holder.app_choice.setVisibility(View.GONE);
 72         }
 73 
 74         holder.appName.setText(info.getDisplayName());
 75         holder.appSize.setText("" + DeviceUtils.convertByte(info.getSize()));
 76 
 77         holder.itemView.setOnClickListener(new View.OnClickListener() {
 78             @Override
 79             public void onClick(View v) {
 80                 if (onItemClickListener != null) {
 81                     int pos = holder.getLayoutPosition();
 82                     onItemClickListener.onItemClick(holder.itemView, pos);
 83                 }
 84             }
 85         });
 86     }
 87 
 88     @Override
 89     public int getItemCount() {
 90         if (list != null) {
 91             return list.size();
 92         } else {
 93             return 0;
 94         }
 95     }
 96 
 97     public DataItem getItem(int position) {
 98         return list.get(position);
 99     }
100 
101     class MyViewHolder extends RecyclerView.ViewHolder {
102         ImageView imageView;
103         ImageView app_choice;
104         TextView appName;
105         TextView appSize;
106 
107         public MyViewHolder(View view) {
108             super(view);
109             imageView = (ImageView) view.findViewById(R.id.appImage);
110 
111             params = (RelativeLayout.LayoutParams) imageView.getLayoutParams();
112             params.width = DensityUtils.getScreenWidth(context) / 6;
113             params.height = params.width;
114             imageView.setLayoutParams(params);
115 
116             appName = (TextView) view.findViewById(R.id.appName);
117             appSize = (TextView) view.findViewById(R.id.appSize);
118             app_choice = (ImageView) view.findViewById(R.id.appSelect_image);
119         }
120     }
121 }