RecyclerView的基本使用

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1、布局文件中使用

1  <android.support.v7.widget.RecyclerView2         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>

2、代码中使用

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

3、适配器

  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 }

更新数据

http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2014/1118/2004.html

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