RecycleView + CardView 控件简析

今天使用了V7包加入的RecycleView 和 CardView,写篇简析。

先上效果图:

原理图:

这是RecycleView的工作原理:

1.LayoutManager用来处理RecycleView的“列表”样式,Support包默认包含了:LinearLayoutManager  横向或纵向的滚动列表、

GridLayoutManager  网格列表、StaggeredGridLayoutManager  交错的网格列表。

2.Adapter负责处理RecycleView的数据和样式

3.在传统的ListView中有一种常见的写法是使用ViewHolder来缓存数据集,在新版的RecycleView内置了ViewHolder这一模块,所以在Adapter内部新建内部类ViewHolder。

4.RecycleView 和listView的一个区别就是本身不处理点击事件,点击事件应该绑在ViewHolder里面,可以直接写也可以通过接口绑在Adapter里面来实现。

 

 首先添加数据集:

 1 package com.lfk.drawapictiure.Info;
 2 
 3 /**
 4  * Created by liufengkai on 15/9/13.
 5  */
 6 public class MenuInfo {
 7     private String paint_name;
 8     private String paint_time;
 9     private String paint_root;
10     private String paint_img_root;
11 
12     public MenuInfo(String paint_name, String paint_time,
13                     String paint_root, String paint_img_root) {
14         this.paint_name = paint_name;
15         this.paint_time = paint_time;
16         this.paint_root = paint_root;
17         this.paint_img_root = paint_img_root;
18     }
19 
20     public String getPaint_name() {
21         return paint_name;
22     }
23 
24     public String getPaint_time() {
25         return paint_time;
26     }
27 
28     public String getPaint_root() {
29         return paint_root;
30     }
31 
32     public String getPaint_img_root() {
33         return paint_img_root;
34     }
35 }

 

实现继承自RecycleView的Adapter中间要包裹自己实现的ViewHolder,onCreateviewHolder函数和onBindViewHolder实现了ListView里面getView的工作,分别为找到控件和控件赋值,

实现点击的接口,设置接口并且绑在ViewHolder的itemView里面即根视图中。

 1 public class MainLayoutAdapter extends RecyclerView.Adapter<MainLayoutAdapter.MainViewHolder> {
 2     private LayoutInflater inflater;
 3     private ArrayList<MenuInfo> userList;
 4     private Context context;
 5     private MainItemClickListener itemClickListener;
 6 
 7     public MainLayoutAdapter(ArrayList<MenuInfo> userList, Context context) {
 8         this.userList = userList;
 9         this.context = context;
10         this.inflater = LayoutInflater.from(context);
11     }
12 
13     public void setItemClickListener(MainItemClickListener itemClickListener) {
14         this.itemClickListener = itemClickListener;
15     }
16   //onCreateviewHolder函数和onBindViewHolder实现了ListView里面getView的工作,分别为找到控件和控件赋值
17     @Override
18     public MainLayoutAdapter.MainViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
19         View wrapper = inflater.inflate(R.layout.draw_item, parent, false);
20         return new MainViewHolder(
21                 wrapper,
22                 (TextView)wrapper.findViewById(R.id.paint_name),
23                 (TextView)wrapper.findViewById(R.id.paint_time),
24                 (TextView)wrapper.findViewById(R.id.paint_root),
25                 (ImageView)wrapper.findViewById(R.id.paint_img));
26     }
27 
28     @Override
29     public void onBindViewHolder(MainViewHolder holder, int position) {
30         MenuInfo menuInfo = userList.get(position);
31         holder.paint_img.setImageURI(Uri.parse(menuInfo.getPaint_img_root()));
32         holder.paint_name.setText(menuInfo.getPaint_name());
33         holder.paint_time.setText(menuInfo.getPaint_time());
34         holder.paint_root.setText(menuInfo.getPaint_root());
35     }
36 
37 
38     @Override
39     public int getItemCount() {
40         return userList.size();
41     }
42 
43     public class MainViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener,View.OnLongClickListener{
44         private TextView paint_name;
45         private TextView paint_time;
46         private TextView paint_root;
47         private ImageView paint_img;
48         public MainViewHolder(View itemView, TextView paint_name,
49                           TextView paint_time, TextView paint_root,
50                           ImageView paint_img) {
51             super(itemView);
52             itemView.setOnClickListener(this);
53             this.paint_name = paint_name;
54             this.paint_time = paint_time;
55             this.paint_root = paint_root;
56             this.paint_img = paint_img;
57         }
58 
59         @Override
60         public void onClick(View view) {
61             MenuInfo menuInfo = userList.get(getAdapterPosition());
62             itemClickListener.onItemClick(view,menuInfo.getPaint_name(),menuInfo.getPaint_root());
63         }
64 
65         @Override
66         public boolean onLongClick(View view) {
67             return false;
68         }
69     }
70 }

 

Activity中的使用:

 1 package com.lfk.drawapictiure.Fragment;
 2 
 3 import android.content.Intent;
 4 import android.net.Uri;
 5 import android.os.Bundle;
 6 import android.os.Environment;
 7 import android.support.v7.widget.LinearLayoutManager;
 8 import android.support.v7.widget.RecyclerView;
 9 import android.view.LayoutInflater;
10 import android.view.View;
11 import android.view.ViewGroup;
12 
13 import com.lfk.drawapictiure.Adapter.MainLayoutAdapter;
14 import com.lfk.drawapictiure.Info.MenuInfo;
15 import com.lfk.drawapictiure.InterFace.MainItemClickListener;
16 import com.lfk.drawapictiure.MainActivity;
17 import com.lfk.drawapictiure.R;
18 
19 import java.util.ArrayList;
20 
21 
22 public class PaintFragment extends android.support.v4.app.Fragment {
23     private RecyclerView mRecyclerView;
24     private MainLayoutAdapter mAdapter;
25     private RecyclerView.LayoutManager mLayoutManager;
26     private String path = Environment.getExternalStorageDirectory().getPath() + "/DrawAPicture";
27 
28     public static PaintFragment newInstance() {
29         return new PaintFragment();
30     }
31 
32     public PaintFragment() {
33         // Required empty public constructor
34     }
35 
36     @Override
37     public void onCreate(Bundle savedInstanceState) {
38         super.onCreate(savedInstanceState);
39 
40     }
41 
42     @Override
43     public View onCreateView(LayoutInflater inflater, ViewGroup container,
44                              Bundle savedInstanceState) {
45         View wrapper = inflater.inflate(R.layout.fragment_paint, container, false);
46         mRecyclerView = (RecyclerView)wrapper.findViewById(R.id.paint_recycle_view);
47         mLayoutManager = new LinearLayoutManager(getActivity());
48         mRecyclerView.setLayoutManager(mLayoutManager); //绑上列表管理器
49         ArrayList<MenuInfo> arrayList = new ArrayList<>();
50         arrayList.add(new MenuInfo("刘丰恺","09-13 05:28",path+"/"+"12138.lfk",path+"/"+"6826.jpg"));
51         arrayList.add(new MenuInfo("刘丰恺","09-13 05:28",path+"/"+"12138.lfk",path+"/"+"6826.jpg"));
52         arrayList.add(new MenuInfo("刘丰恺","09-13 05:28",path+"/"+"12138.lfk",path+"/"+"6826.jpg"));
53         arrayList.add(new MenuInfo("刘丰恺","09-13 05:28",path+"/"+"12138.lfk",path+"/"+"6826.jpg"));
54         mAdapter = new MainLayoutAdapter(arrayList, getActivity());
      // 设置点击事件
55 mAdapter.setItemClickListener(new MainItemClickListener() { 56 @Override 57 public void onItemClick(View view, String name, String path) { 58 Intent intent = new Intent(getActivity(), MainActivity.class); 59 intent.setData(Uri.parse(path)); 60 startActivity(intent); 61 } 62 });
      //绑定数据集
63 mRecyclerView.setAdapter(mAdapter); 64 65 return wrapper; 66 } 67 68 69 }

 

其中的子布局使用了CardView:

我设置的东西只有: 

card_view:cardCornerRadius="4dp"  //设定圆角半径

card_view:cardElevation="8dp"//设定阴影

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <android.support.v7.widget.CardView
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     xmlns:card_view="http://schemas.android.com/apk/res-auto"
 5     android:background="@drawable/list_item_selector"
 6     android:layout_width="match_parent"
 7     android:layout_height="wrap_content"
 8     card_view:cardCornerRadius="4dp"
    card_view: 9 android:layout_margin="@dimen/card_margin"> 10 <RelativeLayout 11 android:layout_marginTop="16dp" 12 android:layout_marginLeft="16dp" 13 android:layout_marginRight="16dp" 14 android:layout_marginBottom="16dp" 15 android:layout_width="match_parent" 16 android:layout_height="wrap_content"> 17 <ImageView 18 android:maxHeight="100dp" 19 android:layout_marginTop="8dp" 20 android:layout_below="@+id/line_view" 21 android:layout_width="match_parent" 22 android:layout_height="wrap_content" 23 android:id="@+id/paint_img" 24 android:src="@mipmap/ic_launcher" /> 25 <TextView 26 android:id="@+id/paint_name" 27 android:textColor="#000" 28 android:textSize="18sp" 29 android:text="项目名" 30 android:layout_alignParentRight="true" 31 android:singleLine="true" 32 android:layout_width="wrap_content" 33 android:layout_height="wrap_content" /> 34 <TextView 35 android:id="@+id/paint_time" 36 android:text="项目时间" 37 android:textColor="@color/black" 38 android:textSize="18sp" 39 android:singleLine="true" 40 android:layout_width="wrap_content" 41 android:layout_height="wrap_content" /> 42 <View 43 android:id="@+id/line_view" 44 android:background="@color/gray" 45 android:layout_below="@+id/paint_time" 46 android:layout_width="match_parent" 47 android:layout_height="1dp"/> 48 <TextView 49 android:id="@+id/paint_root" 50 android:visibility="invisible" 51 android:layout_width="wrap_content" 52 android:layout_height="wrap_content" /> 53 </RelativeLayout> 54 55 </android.support.v7.widget.CardView>

 

  这只是第一篇继续使用过程中发现新特性还会更新!

 

posted @ 2015-09-14 23:06  刘丰恺  阅读(3468)  评论(1编辑  收藏