1、布局文件ListView
2、创建数据适配器
3、ListView与适配器关联，数据加载到ListView上
lv.setAdapter(ada);
1 activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
2 数据适配器ListAdapter及实现类
| android.widget.ListAdapter |
 Known Indirect Subclasses
|
Class Overview
Extended Adapter that is the bridge between a ListView and the data that backs the list. Frequently that data comes from a Cursor, but that is not required. The ListView can display any data provided that it is wrapped in a ListAdapter.
创建数据适配器：
//getView,getCount方法需要覆写，才会显示List记录
BaseAdapter adapter = new BaseAdapter() {
//List中所存放的View,如果是只是一个TextView(简单数据),则返回的是TextView.
TextView tv = new TextView(AdapterActivity.this);
tv.setPadding(8, 8, 8, 8);
tv.setTextSize(20);
tv.setText(arrs[position]);
//如果是一个自定义的复杂的布局，如微博的列表的布局，一行中包含有图片，摆放不同位置的TextView,返回的就是一个layout
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
// 1、获得行布局 用LayoutInflater
// 2、更新行布局
return null;
}
//显示List条数
@Override
public int getCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
};
//只有一个TextView的行的布局，listitem.xml (如果是复杂的布局，用布局加控件)
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</TextView>
二、如果ListView一行是TextView,可以采用ArrayAdapter来实现，不用创建BaseAdapter
1、布局文件activity_main.xml一样
2、Activity
public class ArrayAdapterActivity extends Activity {
ListView lv ;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.listView1);
String[] arr ={"aaa","bbb","ccc","ddd","eee"};
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arr);
lv.setAdapter(arrayAdapter);
}
}
simple_list_item_1是android系统提供的一个layout,每个列表项都是一个普通的TextView
三、自定义多控件的行布局：
1、效果
2、行布局文件custom_list.xml（activity_main.xml同前）
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:src="@drawable/libai" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView1"
android:layout_marginLeft="16dp"
android:layout_toRightOf="@+id/textView1"
android:textSize="20dp"/>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:paddingLeft="20dp"
android:layout_below="@+id/imageView1"
android:text="TextView" />
</RelativeLayout>
3、 Activity
public class MainActivity extends Activity {
private String[] names = new String[]{"虎头","李白","弄玉","清照"};
private int[] imagesIds = new int[]{R.drawable.tiger,R.drawable.libai,R.drawable.nongyu,R.drawable.qingzhao};
private String[] contents = new String[]{
"很可爱的小男孩的名字",
"唐代著名诗人，有一首诗，叫举头望明月，啊，故乡。。。。",
"一个小小女孩",
"寻寻觅觅，冷冷清清，凄凄惨惨戚戚。"
};
ListView lv ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView)findViewById(R.id.listView1);
//LayoutInflater inflater = getLayoutInflater();
BaseAdapter ada = new BaseAdapter() {
//获取每一行的布局
@Override
public View getView(int position, View view, ViewGroup viewGroup) {
// TODO Auto-generated method stub
//获取行布局
LayoutInflater inflater = getLayoutInflater();
RelativeLayout layout = (RelativeLayout)inflater.inflate(R.layout.custom_list, null);
//行布局中的控件
ImageView image = (ImageView)layout.findViewById(R.id.imageView1);
TextView tv1 = (TextView)layout.findViewById(R.id.textView1);
TextView tv2 = (TextView)layout.findViewById(R.id.textView2);
//更新行布局中的内容
image.setImageResource(imagesIds[position]);
tv1.setText(names[position]);
tv2.setText(contents[position]);
return layout;
}
@Override
public int<, /FONT> getCount() {
// TODO Auto-generated method stub
return names.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
};
lv.setAdapter(ada);
}
}
四、使用SimpleAdapter来实现上面的ListView的布局
SimpleAdapter构造方法需要5个参数：
Public Constructors
public SimpleAdapter (Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to)
Parameters
| context |
The context where the View associated with this SimpleAdapter is running |
| data |
A List of Maps. Each entry in the List corresponds to one row in the list. The Maps contain the data for each row, and should include all the entries specified in "from" |
| resource |
Resource identifier of a view layout that defines the views for this list item. The layout file should include at least those named views defined in "to" |
| from |
A list of column names that will be added to the Map associated with each item. |
| to |
The views that should display column in the "from" parameter. These should all be TextViews. The first N views in this list are given the values of the first N columns in the from parameter. |
public class MainActivity extends Activity {
private String[] names = new String[]{"虎头","李白","弄玉","清照"};
private int[] imagesIds = new int[]{R.drawable.tiger,R.drawable.libai,R.drawable.nongyu,R.drawable.qingzhao};
private String[] contents = new String[]{
"很可爱的小男孩的名字",
"唐代著名诗人，有一首诗，叫举头望明月，啊，故乡。。。。",
"一个小小女孩",
"寻寻觅觅，冷冷清清，凄凄惨惨戚戚。"
};
ListView lv ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView)findViewById(R.id.listView1);
List<Map<String,Object>> listItems = new ArrayList<Map<String,Object>>();
for (int i = 0; i < names.length; i++) {
Map<String,Object> listItem = new HashMap<String,Object>();
listItem.put("header", imagesIds[i]);
listItem.put("personName", names[i]);
listItem.put("content",contents[i]);
listItems.add(listItem);
}
SimpleAdapter adapter = new SimpleAdapter(this, listItems, R.layout.custom_list,
new String[]{"personName","header","content"},
new int[]{R.id.name,R.id.header,R.id.content});
lv.setAdapter(adapter);
}
}
五、ListView事件
OnItemClick
public abstract void onItemClick (AdapterView<?> parent, View view, int position, long id)
Callback method to be invoked when an item in this AdapterView has been clicked.
Implementers can call getItemAtPosition(position) if they need to access the data associated with the selected item.
Parameters
| parent |
The AdapterView where the click happened. |
| view |
The view within the AdapterView that was clicked (this will be a view provided by the adapter) |
| position |
The position of the view in the adapter. |
| id |
The row id of the item that was clicked. |
Item长按事件
public abstract boolean onItemLongClick (AdapterView<?> parent, View view, int position, long id)
Callback method to be invoked when an item in this view has been clicked and held. Implementers can call getItemAtPosition(position) if they need to access the data associated with the selected item.
Parameters
| parent |
The AbsListView where the click happened |
| view |
The view within the AbsListView that was clicked |
| position |
The position of the view in the list |
| id |
The row id of the item that was clicked |
Returns
- true if the callback consumed the long click, false otherwise
, style="LINE-HEIGHT: normal; MARGIN-TOP: 0px; FONT-FAMILY: Monaco; MARGIN-BOTTOM: 0px; COLOR: rgb(119,119,119); FONT-SIZE: 11px">@Override
public int getCount() {
// TODO Auto-generated method stub
return names.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
};
lv.setAdapter(ada);
}
}
四、使用SimpleAdapter来实现上面的ListView的布局
SimpleAdapter构造方法需要5个参数：
Public Constructors
public SimpleAdapter (Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to)
Parameters
| context |
The context where the View associated with this SimpleAdapter is running |
| data |
A List of Maps. Each entry in the List corresponds to one row in the list. The Maps contain the data for each row, and should include all the entries specified in "from" |
| resource |
Resource identifier of a view layout that defines the views for this list item. The layout file should include at least those named views defined in "to" |
| from |
A list of column names that will be added to the Map associated with each item. |
| to |
The views that should display column in the "from" parameter. These should all be TextViews. The first N views in this list are given the values of the first N columns in the from parameter. |
public class MainActivity extends Activity {
private String[] names = new String[]{"虎头","李白","弄玉","清照"};
private int[] imagesIds = new int[]{R.drawable.tiger,R.drawable.libai,R.drawable.nongyu,R.drawable.qingzhao};
private String[] contents = new String[]{
"很可爱的小男孩的名字",
"唐代著名诗人，有一首诗，叫举头望明月，啊，故乡。。。。",
"一个小小女孩",
"寻寻觅觅，冷冷清清，凄凄惨惨戚戚。"
<, SPAN style="WHITE-SPACE:, pre">};
ListView lv ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView)findViewById(R.id.listView1);
List<Map<String,Object>> listItems = new ArrayList<Map<String,Object>>();
for (int i = 0; i < names.length; i++) {
Map<String,Object> listItem = new HashMap<String,Object>();
listItem.put("header", imagesIds[i]);
listItem.put("personName", names[i]);
listItem.put("content",contents[i]);
listItems.add(listItem);
}
SimpleAdapter adapter = new SimpleAdapter(this, listItems, R.layout.custom_list,
new String[]{"personName","header","content"},
new int[]{R.id.name,R.id.header,R.id.content});
lv.setAdapter(adapter);
}
}
五、ListView事件
OnItemClick
public abstract void onItemClick (AdapterView<?> parent, View view, int position, long id)
Callback method to be invoked when an item in this AdapterView has been clicked.
Implementers can call getItemAtPosition(position) if they need to access the data associated with the selected item.
Parameters
| parent |
The AdapterView where the click happened. |
| view |
The view within the AdapterView that was clicked (this will be a view provided by the adapter) |
| position |
The position of the view in the adapter. |
| id |
The row id of the item that was clicked. |
Item长按事件
public abstract boolean onItemLongClick (AdapterView<?> parent, View view, int position, long id)
Callback method to be invoked when an item in this view has been clicked and held. Implementers can call getItemAtPosition(position) if they need to access the data associated with the selected item.
Parameters
| parent |
The AbsListView where the click happened |
| view |
The view within the AbsListView that was clicked |
| position |
The position of the view in the list |
| id |
The row id of the item that was clicked |
Returns
- true if the callback consumed the long click, false otherwise
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