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：
package com.lfk.drawapictiure.Info;
/**
* Created by liufengkai on 15/9/13.
*/
public class MenuInfo {
private String paint_name;
private String paint_time;
private String paint_root;
private String paint_img_root;
public MenuInfo(String paint_name, String paint_time,
String paint_root, String paint_img_root) {
this.paint_name = paint_name;
this.paint_time = paint_time;
this.paint_root = paint_root;
this.paint_img_root = paint_img_root;
}
public String getPaint_name() {
return paint_name;
}
public String getPaint_time() {
return paint_time;
}
public String getPaint_root() {
return paint_root;
}
public String getPaint_img_root() {
return paint_img_root;
}
}
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
public class MainLayoutAdapter extends RecyclerView.Adapter<MainLayoutAdapter.MainViewHolder> {
private LayoutInflater inflater;
private ArrayList<MenuInfo> userList;
private Context context;
private MainItemClickListener itemClickListener;
public MainLayoutAdapter(ArrayList<MenuInfo> userList, Context context) {
this.userList = userList;
this.context = context;
this.inflater = LayoutInflater.from(context);
}
public void setItemClickListener(MainItemClickListener itemClickListener) {
this.itemClickListener = itemClickListener;
}
//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
@Override
public MainLayoutAdapter.MainViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View wrapper = inflater.inflate(R.layout.draw_item, parent, false);
return new MainViewHolder(
wrapper,
(TextView)wrapper.findViewById(R.id.paint_name),
(TextView)wrapper.findViewById(R.id.paint_time),
(TextView)wrapper.findViewById(R.id.paint_root),
(ImageView)wrapper.findViewById(R.id.paint_img));
}
@Override
public void onBindViewHolder(MainViewHolder holder, int position) {
MenuInfo menuInfo = userList.get(position);
holder.paint_img.setImageURI(Uri.parse(menuInfo.getPaint_img_root()));
holder.paint_name.setText(menuInfo.getPaint_name());
holder.paint_time.setText(menuInfo.getPaint_time());
holder.paint_root.setText(menuInfo.getPaint_root());
}
@Override
public int getItemCount() {
return userList.size();
}
public class MainViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener,View.OnLongClickListener{
private TextView paint_name;
private TextView paint_time;
private TextView paint_root;
private ImageView paint_img;
public MainViewHolder(View itemView, TextView paint_name,
TextView paint_time, TextView paint_root,
ImageView paint_img) {
super(itemView);
itemView.setOnClickListener(this);
this.paint_name = paint_name;
this.paint_time = paint_time;
this.paint_root = paint_root;
this.paint_img = paint_img;
}
@Override
public void onClick(View view) {
MenuInfo menuInfo = userList.get(getAdapterPosition());
itemClickListener.onItemClick(view,menuInfo.getPaint_name(),menuInfo.getPaint_root());
}
@Override
public boolean onLongClick(View view) {
return false;
}
}
}
Activity中的使用：
package com.lfk.drawapictiure.Fragment;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.lfk.drawapictiure.Adapter.MainLayoutAdapter;
import com.lfk.drawapictiure.Info.MenuInfo;
import com.lfk.drawapictiure.InterFace.MainItemClickListener;
import com.lfk.drawapictiure.MainActivity;
import com.lfk.drawapictiure.R;
import java.util.ArrayList;
public class PaintFragment extends android.support.v4.app.Fragment {
private RecyclerView mRecyclerView;
private MainLayoutAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private String path = Environment.getExternalStorageDirectory().getPath() + "/DrawAPicture";
public static PaintFragment newInstance() {
return new PaintFragment();
}
public PaintFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View wrapper = inflater.inflate(R.layout.fragment_paint, container, false);
mRecyclerView = (RecyclerView)wrapper.findViewById(R.id.paint_recycle_view);
mLayoutManager = new LinearLayoutManager(getActivity());
mRecyclerView.setLayoutManager(mLayoutManager); //绑上列表管理器
ArrayList<MenuInfo> arrayList = new ArrayList<>();
arrayList.add(new MenuInfo("刘丰恺","09-13 05:28",path+"/"+"12138.lfk",path+"/"+"6826.jpg"));
arrayList.add(new MenuInfo("刘丰恺","09-13 05:28",path+"/"+"12138.lfk",path+"/"+"6826.jpg"));
arrayList.add(new MenuInfo("刘丰恺","09-13 05:28",path+"/"+"12138.lfk",path+"/"+"6826.jpg"));
arrayList.add(new MenuInfo("刘丰恺","09-13 05:28",path+"/"+"12138.lfk",path+"/"+"6826.jpg"));
mAdapter = new MainLayoutAdapter(arrayList, getActivity());
// 设置点击事件
mAdapter.setItemClickListener(new MainItemClickListener() {
@Override
public void onItemClick(View view, String name, String path) {
Intent intent = new Intent(getActivity(), MainActivity.class);
intent.setData(Uri.parse(path));
startActivity(intent);
}
});
//绑定数据集
mRecyclerView.setAdapter(mAdapter);
return wrapper;
}
}
其中的子布局使用了CardView:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:background="@drawable/list_item_selector"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardCornerRadius="4dp"
card_view:
android:layout_margin="@dimen/card_margin">
<RelativeLayout
android:layout_marginTop="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginBottom="16dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:maxHeight="100dp"
android:layout_marginTop="8dp"
android:layout_below="@+id/line_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/paint_img"
android:src="@mipmap/ic_launcher" />
<TextView
android:id="@+id/paint_name"
android:textColor="#000"
android:textSize="18sp"
android:text="项目名"
android:layout_alignParentRight="true"
android:singleLine="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/paint_time"
android:text="项目时间"
android:textColor="@color/black"
android:textSize="18sp"
android:singleLine="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<View
android:id="@+id/line_view"
android:background="@color/gray"
android:layout_below="@+id/paint_time"
android:layout_width="match_parent"
android:layout_height="1dp"/>
<TextView
android:id="@+id/paint_root"
android:visibility="invisible"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
</android.support.v7.widget.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
时间： 2024-10-25 09:43:09