一起学Android之ListView

1 <ListView
2         android:id="@+id/lv_info"
3         android:layout_width="match_parent"
4         android:layout_height5         android:dividerHeight="2dp"
6         android:divider="@color/colorDivider"
7         android:choiceMode="singleChoice"
8         android:listSelector="@color/colorSelected"
9         />

 1 mListView= (ListView) this.findViewById(R.id.lv_info);
 2         //1.初始化数据源
 3         lstInfo=new ArrayList<>();
 4         for(int i=0;i<20;i++){
 5             lstInfo.add("Item=>"+i);
 6         }
 7         2.构造适配器
 8         adapter=new ArrayAdapter<String>(MainActivity.,android.R.layout.simple_list_item_1,lstInfo);
 9         3.给ListView赋值
10         addHeaderView必须在setAdapter之前设置，否则不起作用
11         TextView textView=new TextView(MainActivity.);
12         textView.setText("ListView的小例子"13         textView.setTextSize(2014         textView.setLayoutParams(new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT));
15         mListView.addHeaderView(textView);
16         mListView.setAdapter(adapter);
17         Button btnMore=new Button(MainActivity.18         btnMore.setText("加载更多..."19         textView.setTextSize(2020         btnMore.setLayoutParams(21         btnMore.setOnClickListener( View.OnClickListener() {
22             @Override
23             public void onClick(View v) {
24                 int index=lstInfo.size();
25                 int i=index;i<index+20;i++26                     lstInfo.add("Item=>"+(i));
27                 }
28                 adapter.notifyDataSetChanged();
29             }
30         });
31         mListView.addFooterView(btnMore);

 1 mListView.setOnItemClickListener( AdapterView.OnItemClickListener() {
 2 
 3             /**
 4              *
 5              * @param parent 表示控件的主体，此处表示ListView
 view 表示当前被点击的项对应的控件
 7  position 表示当前点击项的索引位置
 8  id 被点击的行的id
 9              */
10 11             void onItemClick(AdapterView<?> parent,View view,int position,1)">long id) {
12                 String s1 = parent.getItemAtPosition(position).toString();
13                 Toast.makeText(MainActivity.this,"当前点击的是=>" + s1,Toast.LENGTH_SHORT).show();
14 16         mListView.setOnItemLongClickListener( AdapterView.OnItemLongClickListener() {
17 
18             19 20 21 23 @return 如果返回true 表示被处理，只响应长按事件，如果返回false，表示还会响应单击事件
24              25 26             boolean onItemLongClick(AdapterView<?> parent,1)">27                 String s1=parent.getItemAtPosition(position).toString();
28                 Toast.makeText(MainActivity.s1,1)">29                 return true;
31         });

 1 <?xml version="1.0" encoding="utf-8"?>
 2 LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3               android:layout_width 4               android:layout_height="match_parent">
 5     TextView
 6         ="@+id/tv_name"
 7 ="wrap_content"
 8         android:layout_weight="1"
 9 ="wrap_content"/>
11         ="@+id/tv_age"
12 13 14 15     16         ="@+id/tv_love"
17 18 19 </LinearLayout>

 1 mListView2= (ListView) .findViewById(R.id.lv_info2);
1. 构造数据源
 3         List<Map<String,Object>> lst=new ArrayList<Map<String,Object>> 5             Map<String,Object> map=new HashMap<String,Object> 6             map.put("colName","张三"+ 7             map.put("colAge",18+ 8             map.put("colLove","篮球"+ 9             lst.add(map);
11         2. 构造适配器填充
12         SimpleAdapter adapter=new SimpleAdapter(Main2Activity.13                 R.layout.listview_item,1)">14                 new String[]{"colName","colAge","colLove"},1)">15                 new int[]{ R.id.tv_name,R.id.tv_age,R.id.tv_love});
16         3. 绑定适配器
17         mListView2.setAdapter(adapter);

 1 mListView2.setOnItemClickListener( 4                 String s1 = parent.getItemAtPosition(position).toString();此处返回的是键值对转换后的字符串
 5                 TextView tvName= (TextView) view.findViewById(R.id.tv_name);
 6                 TextView tvAge= (TextView) view.findViewById(R.id.tv_age);
 7                 TextView tvLove= (TextView) view.findViewById(R.id.tv_love);
 8                 String s2="Name=>"+tvName.getText()+"Age=>"+tvAge.getText()+"Love=>"+tvLove.getText();
 9                 Toast.makeText(Main2Activity.s2,1)">11         });