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テキスト


ResourceCursorAdapter

版本:Android 2.3 r1

结构

继承关系

public abstract classResourceCursorAdapterextendsCursorAdapter

java.lang.Object

android.widget.BaseAdapter

android.widget.CursorAdapter

android.widget.ResourceCursorAdapter

子类及间接子类

直接子类

SimpleCursorAdapter

类概述

这是一个简单的适配器,通过指定一个定义了视图UIXML文件来创建视图。

构造函数

publicResourceCursorAdapter(Contextcontext, int layout,Cursorc)

构造函数

参数

ContextListView相关的正在运行的SimpleListItemFactory上下文

layout一个定义了列表项视图的布局文件资源ID,这个布局同时定义列表项视图和下拉视图,直到你重写它们。

c获取数据的游标

publicResourceCursorAdapter(Contextcontext,int layout,Cursorc, boolean autoRequery)

构造函数

参数

ContextListView相关的正在运行的SimpleListItemFactory上下文

layout一个定义了列表项视图的布局文件资源ID,这个布局同时定义列表项视图和下拉视图,直到你重写它们。

c获取数据的游标

autoRequery如果此参数为true,当适配器的数据发生变化的时,适配器会调用游标的requery()方法,使最新的数据始终显示

公共方法

publicViewnewDropDownView(Contextcontext,Cursorcursor,ViewGroupparent)

生成一个新的下拉视图来控制游标指向的数据

参数

context应用程序全局信息接口(应用上下文)

cursor获取数据的游标,它已经移动到正确的位置

parent与新视图相关联的上级视图

返回值

新创建的视图

publicViewnewView(Contextcontext,Cursorcursor,ViewGroupparent)

根据指定的xml文件创建视图

参数

context应用程序全局信息接口(应用上下文)

cursor获取数据的游标,它已经移动到正确的位置

parent与新视图相关联的上级视图

返回值

新创建的视图

参见

newView(android.content.Context, android.database.Cursor, ViewGroup)

public voidsetDropDownViewResource(int dropDownLayout)

设置下拉视图相应的布局资源

参数

dropDownLayout用于创建下拉视图的布局资源

public voidsetViewResource(int layout)

设置列表项视图相应的布局资源

参数

layout用于创建列表项视图的布局资源

补充

文章精选

ListActivity简介

代码示例(ApiDemos\src\com\example\android\apis\app\QuickContactsDemo.java

Java

public class QuickContactsDemo extends ListActivity {

static final String[] CONTACTS_SUMMARY_PROJECTION = new String[] {

Contacts._ID, // 0

Contacts.DISPLAY_NAME, // 1

Contacts.STARRED, // 2

Contacts.TIMES_CONTACTED, // 3

Contacts.CONTACT_PRESENCE, // 4

Contacts.PHOTO_ID, // 5

Contacts.LOOKUP_KEY, // 6

Contacts.HAS_PHONE_NUMBER, // 7

};

static final int SUMMARY_ID_COLUMN_INDEX = 0;

static final int SUMMARY_NAME_COLUMN_INDEX = 1;

static final int SUMMARY_STARRED_COLUMN_INDEX = 2;

static final int SUMMARY_TIMES_CONTACTED_COLUMN_INDEX = 3;

static final int SUMMARY_PRESENCE_STATUS_COLUMN_INDEX = 4;

static final int SUMMARY_PHOTO_ID_COLUMN_INDEX = 5;

static final int SUMMARY_LOOKUP_KEY = 6;

static final int SUMMARY_HAS_PHONE_COLUMN_INDEX = 7;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

String select = "((" + Contacts.DISPLAY_NAME + " NOTNULL) AND ("

+ Contacts.HAS_PHONE_NUMBER + "=1) AND ("

+ Contacts.DISPLAY_NAME + " != '' ))";

Cursor c =

getContentResolver().query(Contacts.CONTENT_URI, CONTACTS_SUMMARY_PROJECTION, select,

null, Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC");

startManagingCursor(c);

ContactListItemAdapter adapter = new ContactListItemAdapter(this, R.layout.quick_contacts, c);

setListAdapter(adapter);

}

private final class ContactListItemAdapter extends ResourceCursorAdapter {

public ContactListItemAdapter(Context context, int layout, Cursor c) {

super(context, layout, c);

}

@Override

public void bindView(View view, Context context, Cursor cursor) {

final ContactListItemCache cache = (ContactListItemCache) view.getTag();

TextView nameView = cache.nameView;

QuickContactBadge photoView = cache.photoView;

// Set the name

cursor.copyStringToBuffer(SUMMARY_NAME_COLUMN_INDEX, cache.nameBuffer);

int size = cache.nameBuffer.sizeCopied;

cache.nameView.setText(cache.nameBuffer.data, 0, size);

final long contactId = cursor.getLong(SUMMARY_ID_COLUMN_INDEX);

final String lookupKey = cursor.getString(SUMMARY_LOOKUP_KEY);

cache.photoView.assignContactUri(Contacts.getLookupUri(contactId, lookupKey));

}

@Override

public View newView(Context context, Cursor cursor, ViewGroup parent) {

View view = super.newView(context, cursor, parent);

ContactListItemCache cache = new ContactListItemCache();

cache.nameView = (TextView) view.findViewById(R.id.name);

cache.photoView = (QuickContactBadge) view.findViewById(R.id.badge);

view.setTag(cache);

return view;

}

}

final static class ContactListItemCache {

public TextView nameView;

public QuickContactBadge photoView;

public CharArrayBuffer nameBuffer = new CharArrayBuffer(128);

}


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