- 1 目标
listview是使用率非常高的，尽量少的代码完成listview功能，这里设计一种基于网络的可上下刷新的listview：【NetRefreshListView】
- 2 API调用
某个Activity使用【NetRefreshListView】时，只需要完成下面两个API调用
- 2.1 初始化
1 NetRefreshListView netRefreshListView = new NetRefreshListView<CourseBean>(ConstUtil.COURSE_LIST, R.layout.homev4_listitem_hotcourse_layout, this); 2 netRefreshListView.refresh();
其中构造函数的解释：
1 /**
2 * 构造函数：
3 * 1 netype: 网络URL
4 * 2 adapterres：adapter的资源id
5 * 3 INetRefreshListListener：监听器，用于获取activit相关信息*/
6 public NetRefreshListView(String netype, int adapterres, final INetRefreshListListener in_listener) {}
- 2.2 实现接口
1 public interface INetRefreshListListener {
2 void onItemClickListener(int position, String netype); //点击时处理逻辑
3
4 void netList(int index, String netype); //获取第几页的数据
5
6 void isEnd(String netype); //已经到了尾部
7
8 int getDataTotalSize(String netype); //获取所有数据的数量
9
10 void drawUIWithList(String netype); //网络有数据时，渲染UI
11
12 void drawUIWithEmptyList(String netype);//网络无数据时，渲染UI
13
14 Context getContext(); //获取上下文
15
16 void setAdapterConvert(BaseViewHolder viewHolder, Object t, String jjNetype); //初始化adapter
17
18 PullToRefreshListView onGetPullToRefreshListView(String netype); //获取UI级list
19 }
- 3 API特点
该API依赖PullToRefreshListView，实现顶部尾部下拉刷新，再结合xutils 的网络访问便可以轻松实现listview功能，相比pulltorefreshlistview，这次重构有以下几个优点：
3.1 不再写：判断是否重新加载、更多加载之类的代码，节省50行代码量
3.2 精简网络访问的API，只需要调用【netlist】方法便可以
3.3 精简adapter，只需复写【setAdapterConvert】方法便可以，不再每次额外新建一个adapter类
4 未考虑地方
4.1 listview的局部数据更新
4.2 判断是否加载更多的方法【getDataTotalSize】，有待继续完善，不能适配所有，这里之所以这样做，因为后台服务端给提供一个total字段来识别之。
5 源码
1 package com.huisharing.pbook.controller.util;
2
3 import android.content.Context;
4 import android.os.Handler;
5 import android.os.Message;
6 import android.util.Log;
7 import android.view.View;
8 import android.widget.AdapterView;
9
10 import com.huisharing.pbook.adapter.base.BaseViewHolder;
11 import com.huisharing.pbook.adapter.base.MyBaseAdapter;
12 import com.huisharing.pbook.widget.PullToRefreshBase;
13 import com.huisharing.pbook.widget.PullToRefreshListView;
14
15 import java.lang.reflect.Constructor;
16 import java.util.ArrayList;
17 import java.util.List;
18
19 /**
20 * 基于网络获取的listview
21 * Created by Administrator on 2016/8/13.
22 */
23 public class NetRefreshListView<T> {
24 PullToRefreshListView listView;
25 MyBaseAdapter adapter;
26 List list = new ArrayList<>(4);
27 INetRefreshListListener m_listener;
28 private int index = 1;
29 private boolean isRefresh = true;
30 private String jjNetype;
31
32 final static int DRAWITHCOURSE = 1;
33 final static int DRAWITHEMPTY = 2;
34 private Handler handler = new Handler() {
35 public void handleMessage(Message msg) {
36 switch (msg.what) {
37 case DRAWITHCOURSE:
38 m_listener.drawUIWithList(jjNetype);
39 if (isRefresh) {
40 list.clear();
41 }
42 list.addAll((List) msg.obj);
43 adapter.notifyDataSetChanged();
44 break;
45
46 case DRAWITHEMPTY:
47 m_listener.drawUIWithEmptyList(jjNetype);
48 break;
49
50 }
51 }
52 };
53
54
55 public List<T> getAdapterList() {
56 return adapter.getList();
57 }
58
59 public void doUIAfternet(List list) {
60 if (list == null || list.size() <= 0) {
61 handler.sendEmptyMessage(DRAWITHEMPTY);
62 } else {
63 Message msg = new Message();
64 msg.what = DRAWITHCOURSE;
65 msg.obj = list;
66 handler.sendMessage(msg);
67 }
68 }
69
70 public interface INetRefreshListListener {
71 void onItemClickListener(int position, String netype); //点击时处理逻辑
72
73 void netList(int index, String netype); //获取第几页的数据
74
75 void isEnd(String netype); //已经到了尾部
76
77 int getDataTotalSize(String netype); //获取所有数据的数量
78
79 void drawUIWithList(String netype); //网络有数据时，渲染UI
80
81 void drawUIWithEmptyList(String netype);//网络无数据时，渲染UI
82
83 Context getContext(); //获取上下文
84
85 void setAdapterConvert(BaseViewHolder viewHolder, Object t, String jjNetype); //初始化adapter
86
87 PullToRefreshListView onGetPullToRefreshListView(String netype); //获取UI级list
88 }
89
90 class ListAdapter extends MyBaseAdapter<T> {
91
92 public ListAdapter(Context context, int resource, List<T> list) {
93 super(context, resource, list);
94 }
95
96 @Override
97 public void setConvert(BaseViewHolder viewHolder, T t) {
98 m_listener.setAdapterConvert(viewHolder, t, jjNetype);
99 }
100 }
101
102 /**
103 * 构造函数：
104 * 1 netype: 网络URL
105 * 2 adapterres：adapter的资源id
106 * 3 INetRefreshListListener：监听器，用于获取activit相关信息
107 */
108 public NetRefreshListView(String netype, int adapterres, final INetRefreshListListener in_listener) {
109 try {
110 m_listener = in_listener;
111 listView = in_listener.onGetPullToRefreshListView(netype);
112
113 Constructor cons = ListAdapter.class.getConstructor(NetRefreshListView.class, Context.class, int.class, List.class);
114 adapter = (ListAdapter) cons.newInstance(new Object[]{this, m_listener.getContext(), adapterres, list});
115
116 jjNetype = netype;
117 listView.getRefreshableView().setAdapter(adapter);
118 listView.getRefreshableView().setOnItemClickListener(new AdapterView.OnItemClickListener() {
119 @Override
120 public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
121 m_listener.onItemClickListener(position, jjNetype);
122 }
123 });
124
125 listView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener() {
126 @Override
127 public void onRefresh() {
128 if (listView.hasPullFromTop() || (!listView.hasPullFromTop() && m_listener.getDataTotalSize(jjNetype) <= 0)) {
129 index = 1;
130 isRefresh = true;
131 m_listener.netList(index, jjNetype);
132 } else {
133 isRefresh = false;
134 if (!next()) {
135 listView.onRefreshComplete();
136 m_listener.isEnd(jjNetype);
137 return;
138 }
139 index++;
140 m_listener.netList(index, jjNetype);
141 }
142 listView.onRefreshComplete();
143 }
144 });
145 } catch (Exception e) {
146 Log.e("GXT", e.getMessage());
147 }
148 }
149
150 public void refresh() {
151 index = 1;
152 isRefresh = true;
153 m_listener.netList(index, jjNetype);
154 }
155
156
157 private boolean next() {
158 if (list.size() < m_listener.getDataTotalSize(jjNetype)) {
159 return true;
160 } else {
161 return false;
162 }
163 }
164
165 }
时间： 2024-10-03 14:41:44