[转]Android共享数据ContentProvider的使用
2011-12-30 10:54
585 查看
本文转自：/article/4557247.html
ContentProvider数据共享
1.首先在AndroidManifest.xml文件中添加对外暴露的数据共享接口Content
Xml代码
<provider android:name=".UserProvider" android:authorities="com.yaku.ContentProvider.userprovider"/>
ContentProvider采用了authorities（主机名/域名）对它进行唯一标识，authorities 就是他的域名
2.Url解析
content://com.yaku.ContentProvider.userprovider/user/2
【content://】 Android定义的内容提供都的Schema
【com.yaku.ContentProvider.userprovider】 主机名或者authorities
【user】 路径
【2】 ID
示例代码：
数据结构User.java：
Java代码
package com.yaku.pojo; public class User { private int id; private String name; private int age; public User(int id, String name, int age) { super(); this.id = id; this.name = name; this.age = age; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "User [age=" + age + ", id=" + id + ", name=" + name + "]"; } }
数据库操作DBOpenHelper.java：
Java代码
package com.yaku.db; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class DBOpenHelper extends SQLiteOpenHelper { private static final String DBNAME = "yaku.db"; //数据库名称 private static final int DBVER = 1;//数据库版本 public DBOpenHelper(Context context) { super(context, DBNAME, null, DBVER); } @Override public void onCreate(SQLiteDatabase db) { String sql = "CREATE TABLE user (userid integer primary key autoincrement, name varchar(20), age integer)"; db.execSQL(sql);//执行有更改的sql语句 } @Override public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) { db.execSQL("DROP TABLE IF EXISTS user"); onCreate(db); } }
对外共享处理类ContentProviderUser.java：
Java代码
package com.yaku.ContentProvider; import com.yaku.db.DBOpenHelper; import android.content.ContentProvider; import android.content.ContentUris; import android.content.ContentValues; import android.content.UriMatcher; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.net.Uri; public class ContentProviderUser extends ContentProvider { private DBOpenHelper dbOpenHelper; //常量UriMatcher.NO_MATCH表示不匹配任何路径的返回码 private static final UriMatcher MATCHER = new UriMatcher(UriMatcher.NO_MATCH); private static final int USERS = 1; private static final int USER = 2; static{ //如果match()方法匹配content://com.yaku.ContentProvider.userprovider/user路径，返回匹配码为1 MATCHER.addURI("com.yaku.ContentProvider.userprovider", "user", USERS); //如果match()方法匹配content://com.yaku.ContentProvider.userprovider/user/123路径，返回匹配码为2 MATCHER.addURI("com.yaku.ContentProvider.userprovider", "user/#", USER);//#号为通配符 } @Override public int delete(Uri uri, String selection, String[] selectionArgs) { SQLiteDatabase db = dbOpenHelper.getWritableDatabase(); int count = 0; switch (MATCHER.match(uri)) { case USERS: count = db.delete("user", selection, selectionArgs); return count; case USER: //ContentUris类用于获取Uri路径后面的ID部分 long id = ContentUris.parseId(uri); String where = "userid = "+ id; if(selection!=null && !"".equals(selection)){ where = selection + " and " + where; } count = db.delete("user", where, selectionArgs); return count; default: throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString()); } } /** * 该方法用于返回当前Url所代表数据的MIME类型。 * 如果操作的数据属于集合类型，那么MIME类型字符串应该以vnd.android.cursor.dir/开头 * 如果要操作的数据属于非集合类型数据，那么MIME类型字符串应该以vnd.android.cursor.item/开头 */ @Override public String getType(Uri uri) { switch (MATCHER.match(uri)) { case USERS: return "vnd.android.cursor.dir/user"; case USER: return "vnd.android.cursor.item/user"; default: throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString()); } } @Override public Uri insert(Uri uri, ContentValues values) { SQLiteDatabase db = dbOpenHelper.getWritableDatabase(); switch (MATCHER.match(uri)) { case USERS: long rowid = db.insert("user", "name", values); Uri insertUri = ContentUris.withAppendedId(uri, rowid);//得到代表新增记录的Uri this.getContext().getContentResolver().notifyChange(uri, null); return insertUri; default: throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString()); } } @Override public boolean onCreate() { this.dbOpenHelper = new DBOpenHelper(this.getContext()); return false; } @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { SQLiteDatabase db = dbOpenHelper.getReadableDatabase(); switch (MATCHER.match(uri)) { case USERS: return db.query("user", projection, selection, selectionArgs, null, null, sortOrder); case USER: long id = ContentUris.parseId(uri); String where = "userid = "+ id; if(selection!=null && !"".equals(selection)){ where = selection + " and " + where; } return db.query("user", projection, where, selectionArgs, null, null, sortOrder); default: throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString()); } } @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { SQLiteDatabase db = dbOpenHelper.getWritableDatabase(); int count = 0; switch (MATCHER.match(uri)) { case USERS: count = db.update("person", values, selection, selectionArgs); return count; case USER: long id = ContentUris.parseId(uri); String where = "userid = "+ id; if(selection!=null && !"".equals(selection)){ where = selection + " and " + where; } count = db.update("user", values, where, selectionArgs); return count; default: throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString()); } } }
单元测试类（在另一个应用中）：
Java代码
package com.yaku.ContentProvider; import android.content.ContentResolver; import android.content.ContentValues; import android.database.Cursor; import android.net.Uri; import android.test.AndroidTestCase; import android.util.Log; /** * 对ContentProvider工程中的ContentProviderActivity进行单元测试 */ public class ContentProviderActivityTest extends AndroidTestCase { private static final String TAG = "ContentProvider"; //往内容提供者添加数据 public void testInsert() throws Throwable{ ContentResolver contentResolver = this.getContext().getContentResolver(); Uri insertUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user"); ContentValues values = new ContentValues(); values.put("name", "道长"); values.put("age", 86); Uri uri = contentResolver.insert(insertUri, values); Log.i(TAG, uri.toString()); } //更新内容提供者中的数据 public void testUpdate() throws Throwable{ ContentResolver contentResolver = this.getContext().getContentResolver(); Uri updateUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user/1"); ContentValues values = new ContentValues(); values.put("name", "青眉道长"); contentResolver.update(updateUri, values, null, null); } //从内容提供者中删除数据 public void testDelete() throws Throwable{ ContentResolver contentResolver = this.getContext().getContentResolver(); Uri deleteUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user/1"); contentResolver.delete(deleteUri, null, null); } //获取内容提供者中的数据 public void testFind() throws Throwable{ ContentResolver contentResolver = this.getContext().getContentResolver(); Uri selectUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user"); Cursor cursor = contentResolver.query(selectUri, null, null, null, "userid desc"); while(cursor.moveToNext()){ int id = cursor.getInt(cursor.getColumnIndex("userid")); String name = cursor.getString(cursor.getColumnIndex("name")); int age = cursor.getInt(cursor.getColumnIndex("age")); Log.i(TAG, "id="+ id + ",name="+ name+ ",age="+ age); } } }
监听数据的变化：
Java代码
<SPAN style="FONT-SIZE: medium">package com.yaku.ContentProvider; import android.content.ContentResolver; import android.content.ContentValues; import android.database.Cursor; import android.net.Uri; import android.test.AndroidTestCase; import android.util.Log; /** * 监听数据变化 */ public class OtherContentProviderTest extends AndroidTestCase { private static final String TAG = "OtherContentProvider"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Uri insertUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user"); ContentResolver contentResolver = this.getContentResolver(); //对指定uri进行监听，如果该uri代表的数据发生变化，就会调用PersonObserver中的onChange() contentResolver.registerContentObserver(insertUri, true, new PersonObserver(new Handler())); } private final class PersonObserver extends ContentObserver{ public PersonObserver(Handler handler) { super(handler); } @Override public void onChange(boolean selfChange) { ContentResolver contentResolver = getContentResolver(); Uri selectUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user"); Cursor cursor = contentResolver.query(selectUri, null, null, null, "userid desc"); while(cursor.moveToNext()){ int id = cursor.getInt(cursor.getColumnIndex("userid")); String name = cursor.getString(cursor.getColumnIndex("name")); int age = cursor.getInt(cursor.getColumnIndex("age")); Log.i(TAG, "id="+ id + ",name="+ name+ ",age="+ age); } } } }</SPAN>
ContentProvider数据共享
1.首先在AndroidManifest.xml文件中添加对外暴露的数据共享接口Content
Xml代码
<provider android:name=".UserProvider" android:authorities="com.yaku.ContentProvider.userprovider"/>
<provider android:name=".UserProvider" android:authorities="com.yaku.ContentProvider.userprovider"/>
ContentProvider采用了authorities（主机名/域名）对它进行唯一标识，authorities 就是他的域名
2.Url解析
content://com.yaku.ContentProvider.userprovider/user/2
【content://】 Android定义的内容提供都的Schema
【com.yaku.ContentProvider.userprovider】 主机名或者authorities
【user】 路径
【2】 ID
示例代码：
数据结构User.java：
Java代码
package com.yaku.pojo; public class User { private int id; private String name; private int age; public User(int id, String name, int age) { super(); this.id = id; this.name = name; this.age = age; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "User [age=" + age + ", id=" + id + ", name=" + name + "]"; } }
package com.yaku.pojo;
public class User {
private int id;
private String name;
private int age;
public User(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "User [age=" + age + ", id=" + id + ", name=" + name + "]";
}
}数据库操作DBOpenHelper.java：
Java代码
package com.yaku.db; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class DBOpenHelper extends SQLiteOpenHelper { private static final String DBNAME = "yaku.db"; //数据库名称 private static final int DBVER = 1;//数据库版本 public DBOpenHelper(Context context) { super(context, DBNAME, null, DBVER); } @Override public void onCreate(SQLiteDatabase db) { String sql = "CREATE TABLE user (userid integer primary key autoincrement, name varchar(20), age integer)"; db.execSQL(sql);//执行有更改的sql语句 } @Override public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) { db.execSQL("DROP TABLE IF EXISTS user"); onCreate(db); } }
package com.yaku.db;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DBOpenHelper extends SQLiteOpenHelper {
private static final String DBNAME = "yaku.db"; //数据库名称
private static final int DBVER = 1;//数据库版本
public DBOpenHelper(Context context) {
super(context, DBNAME, null, DBVER);
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql = "CREATE TABLE user (userid integer primary key autoincrement, name varchar(20), age integer)";
db.execSQL(sql);//执行有更改的sql语句
}
@Override
public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
db.execSQL("DROP TABLE IF EXISTS user");
onCreate(db);
}
}对外共享处理类ContentProviderUser.java：
Java代码
package com.yaku.ContentProvider; import com.yaku.db.DBOpenHelper; import android.content.ContentProvider; import android.content.ContentUris; import android.content.ContentValues; import android.content.UriMatcher; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.net.Uri; public class ContentProviderUser extends ContentProvider { private DBOpenHelper dbOpenHelper; //常量UriMatcher.NO_MATCH表示不匹配任何路径的返回码 private static final UriMatcher MATCHER = new UriMatcher(UriMatcher.NO_MATCH); private static final int USERS = 1; private static final int USER = 2; static{ //如果match()方法匹配content://com.yaku.ContentProvider.userprovider/user路径，返回匹配码为1 MATCHER.addURI("com.yaku.ContentProvider.userprovider", "user", USERS); //如果match()方法匹配content://com.yaku.ContentProvider.userprovider/user/123路径，返回匹配码为2 MATCHER.addURI("com.yaku.ContentProvider.userprovider", "user/#", USER);//#号为通配符 } @Override public int delete(Uri uri, String selection, String[] selectionArgs) { SQLiteDatabase db = dbOpenHelper.getWritableDatabase(); int count = 0; switch (MATCHER.match(uri)) { case USERS: count = db.delete("user", selection, selectionArgs); return count; case USER: //ContentUris类用于获取Uri路径后面的ID部分 long id = ContentUris.parseId(uri); String where = "userid = "+ id; if(selection!=null && !"".equals(selection)){ where = selection + " and " + where; } count = db.delete("user", where, selectionArgs); return count; default: throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString()); } } /** * 该方法用于返回当前Url所代表数据的MIME类型。 * 如果操作的数据属于集合类型，那么MIME类型字符串应该以vnd.android.cursor.dir/开头 * 如果要操作的数据属于非集合类型数据，那么MIME类型字符串应该以vnd.android.cursor.item/开头 */ @Override public String getType(Uri uri) { switch (MATCHER.match(uri)) { case USERS: return "vnd.android.cursor.dir/user"; case USER: return "vnd.android.cursor.item/user"; default: throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString()); } } @Override public Uri insert(Uri uri, ContentValues values) { SQLiteDatabase db = dbOpenHelper.getWritableDatabase(); switch (MATCHER.match(uri)) { case USERS: long rowid = db.insert("user", "name", values); Uri insertUri = ContentUris.withAppendedId(uri, rowid);//得到代表新增记录的Uri this.getContext().getContentResolver().notifyChange(uri, null); return insertUri; default: throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString()); } } @Override public boolean onCreate() { this.dbOpenHelper = new DBOpenHelper(this.getContext()); return false; } @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { SQLiteDatabase db = dbOpenHelper.getReadableDatabase(); switch (MATCHER.match(uri)) { case USERS: return db.query("user", projection, selection, selectionArgs, null, null, sortOrder); case USER: long id = ContentUris.parseId(uri); String where = "userid = "+ id; if(selection!=null && !"".equals(selection)){ where = selection + " and " + where; } return db.query("user", projection, where, selectionArgs, null, null, sortOrder); default: throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString()); } } @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { SQLiteDatabase db = dbOpenHelper.getWritableDatabase(); int count = 0; switch (MATCHER.match(uri)) { case USERS: count = db.update("person", values, selection, selectionArgs); return count; case USER: long id = ContentUris.parseId(uri); String where = "userid = "+ id; if(selection!=null && !"".equals(selection)){ where = selection + " and " + where; } count = db.update("user", values, where, selectionArgs); return count; default: throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString()); } } }
package com.yaku.ContentProvider;
import com.yaku.db.DBOpenHelper;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
public class ContentProviderUser extends ContentProvider {
private DBOpenHelper dbOpenHelper;
//常量UriMatcher.NO_MATCH表示不匹配任何路径的返回码
private static final UriMatcher MATCHER = new UriMatcher(UriMatcher.NO_MATCH);
private static final int USERS = 1;
private static final int USER = 2;
static{
//如果match()方法匹配content://com.yaku.ContentProvider.userprovider/user路径，返回匹配码为1
MATCHER.addURI("com.yaku.ContentProvider.userprovider", "user", USERS);
//如果match()方法匹配content://com.yaku.ContentProvider.userprovider/user/123路径，返回匹配码为2
MATCHER.addURI("com.yaku.ContentProvider.userprovider", "user/#", USER);//#号为通配符
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
int count = 0;
switch (MATCHER.match(uri)) {
case USERS:
count = db.delete("user", selection, selectionArgs);
return count;
case USER:
//ContentUris类用于获取Uri路径后面的ID部分
long id = ContentUris.parseId(uri);
String where = "userid = "+ id;
if(selection!=null && !"".equals(selection)){
where = selection + " and " + where;
}
count = db.delete("user", where, selectionArgs);
return count;
default:
throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString());
}
}
/**
* 该方法用于返回当前Url所代表数据的MIME类型。
* 如果操作的数据属于集合类型，那么MIME类型字符串应该以vnd.android.cursor.dir/开头
* 如果要操作的数据属于非集合类型数据，那么MIME类型字符串应该以vnd.android.cursor.item/开头
*/
@Override
public String getType(Uri uri) {
switch (MATCHER.match(uri)) {
case USERS:
return "vnd.android.cursor.dir/user";
case USER:
return "vnd.android.cursor.item/user";
default:
throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString());
}
}
@Override
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
switch (MATCHER.match(uri)) {
case USERS:
long rowid = db.insert("user", "name", values);
Uri insertUri = ContentUris.withAppendedId(uri, rowid);//得到代表新增记录的Uri
this.getContext().getContentResolver().notifyChange(uri, null);
return insertUri;
default:
throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString());
}
}
@Override
public boolean onCreate() {
this.dbOpenHelper = new DBOpenHelper(this.getContext());
return false;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
SQLiteDatabase db = dbOpenHelper.getReadableDatabase();
switch (MATCHER.match(uri)) {
case USERS:
return db.query("user", projection, selection, selectionArgs, null, null, sortOrder);
case USER:
long id = ContentUris.parseId(uri);
String where = "userid = "+ id;
if(selection!=null && !"".equals(selection)){
where = selection + " and " + where;
}
return db.query("user", projection, where, selectionArgs, null, null, sortOrder);
default:
throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString());
}
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
int count = 0;
switch (MATCHER.match(uri)) {
case USERS:
count = db.update("person", values, selection, selectionArgs);
return count;
case USER:
long id = ContentUris.parseId(uri);
String where = "userid = "+ id;
if(selection!=null && !"".equals(selection)){
where = selection + " and " + where;
}
count = db.update("user", values, where, selectionArgs);
return count;
default:
throw new IllegalArgumentException("Unkwon Uri:"+ uri.toString());
}
}
}单元测试类（在另一个应用中）：
Java代码
package com.yaku.ContentProvider; import android.content.ContentResolver; import android.content.ContentValues; import android.database.Cursor; import android.net.Uri; import android.test.AndroidTestCase; import android.util.Log; /** * 对ContentProvider工程中的ContentProviderActivity进行单元测试 */ public class ContentProviderActivityTest extends AndroidTestCase { private static final String TAG = "ContentProvider"; //往内容提供者添加数据 public void testInsert() throws Throwable{ ContentResolver contentResolver = this.getContext().getContentResolver(); Uri insertUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user"); ContentValues values = new ContentValues(); values.put("name", "道长"); values.put("age", 86); Uri uri = contentResolver.insert(insertUri, values); Log.i(TAG, uri.toString()); } //更新内容提供者中的数据 public void testUpdate() throws Throwable{ ContentResolver contentResolver = this.getContext().getContentResolver(); Uri updateUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user/1"); ContentValues values = new ContentValues(); values.put("name", "青眉道长"); contentResolver.update(updateUri, values, null, null); } //从内容提供者中删除数据 public void testDelete() throws Throwable{ ContentResolver contentResolver = this.getContext().getContentResolver(); Uri deleteUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user/1"); contentResolver.delete(deleteUri, null, null); } //获取内容提供者中的数据 public void testFind() throws Throwable{ ContentResolver contentResolver = this.getContext().getContentResolver(); Uri selectUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user"); Cursor cursor = contentResolver.query(selectUri, null, null, null, "userid desc"); while(cursor.moveToNext()){ int id = cursor.getInt(cursor.getColumnIndex("userid")); String name = cursor.getString(cursor.getColumnIndex("name")); int age = cursor.getInt(cursor.getColumnIndex("age")); Log.i(TAG, "id="+ id + ",name="+ name+ ",age="+ age); } } }
package com.yaku.ContentProvider;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.test.AndroidTestCase;
import android.util.Log;
/**
* 对ContentProvider工程中的ContentProviderActivity进行单元测试
*/
public class ContentProviderActivityTest extends AndroidTestCase {
private static final String TAG = "ContentProvider";
//往内容提供者添加数据
public void testInsert() throws Throwable{
ContentResolver contentResolver = this.getContext().getContentResolver();
Uri insertUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user");
ContentValues values = new ContentValues();
values.put("name", "道长");
values.put("age", 86);
Uri uri = contentResolver.insert(insertUri, values);
Log.i(TAG, uri.toString());
}
//更新内容提供者中的数据
public void testUpdate() throws Throwable{
ContentResolver contentResolver = this.getContext().getContentResolver();
Uri updateUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user/1");
ContentValues values = new ContentValues();
values.put("name", "青眉道长");
contentResolver.update(updateUri, values, null, null);
}
//从内容提供者中删除数据
public void testDelete() throws Throwable{
ContentResolver contentResolver = this.getContext().getContentResolver();
Uri deleteUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user/1");
contentResolver.delete(deleteUri, null, null);
}
//获取内容提供者中的数据
public void testFind() throws Throwable{
ContentResolver contentResolver = this.getContext().getContentResolver();
Uri selectUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user");
Cursor cursor = contentResolver.query(selectUri, null, null, null, "userid desc");
while(cursor.moveToNext()){
int id = cursor.getInt(cursor.getColumnIndex("userid"));
String name = cursor.getString(cursor.getColumnIndex("name"));
int age = cursor.getInt(cursor.getColumnIndex("age"));
Log.i(TAG, "id="+ id + ",name="+ name+ ",age="+ age);
}
}
}监听数据的变化：
Java代码
<SPAN style="FONT-SIZE: medium">package com.yaku.ContentProvider; import android.content.ContentResolver; import android.content.ContentValues; import android.database.Cursor; import android.net.Uri; import android.test.AndroidTestCase; import android.util.Log; /** * 监听数据变化 */ public class OtherContentProviderTest extends AndroidTestCase { private static final String TAG = "OtherContentProvider"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Uri insertUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user"); ContentResolver contentResolver = this.getContentResolver(); //对指定uri进行监听，如果该uri代表的数据发生变化，就会调用PersonObserver中的onChange() contentResolver.registerContentObserver(insertUri, true, new PersonObserver(new Handler())); } private final class PersonObserver extends ContentObserver{ public PersonObserver(Handler handler) { super(handler); } @Override public void onChange(boolean selfChange) { ContentResolver contentResolver = getContentResolver(); Uri selectUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user"); Cursor cursor = contentResolver.query(selectUri, null, null, null, "userid desc"); while(cursor.moveToNext()){ int id = cursor.getInt(cursor.getColumnIndex("userid")); String name = cursor.getString(cursor.getColumnIndex("name")); int age = cursor.getInt(cursor.getColumnIndex("age")); Log.i(TAG, "id="+ id + ",name="+ name+ ",age="+ age); } } } }</SPAN>
package com.yaku.ContentProvider;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.test.AndroidTestCase;
import android.util.Log;
/**
* 监听数据变化
*/
public class OtherContentProviderTest extends AndroidTestCase {
private static final String TAG = "OtherContentProvider";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Uri insertUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user");
ContentResolver contentResolver = this.getContentResolver();
//对指定uri进行监听，如果该uri代表的数据发生变化，就会调用PersonObserver中的onChange()
contentResolver.registerContentObserver(insertUri, true, new PersonObserver(new Handler()));
}
private final class PersonObserver extends ContentObserver{
public PersonObserver(Handler handler) {
super(handler);
}
@Override
public void onChange(boolean selfChange) {
ContentResolver contentResolver = getContentResolver();
Uri selectUri = Uri.parse("content://com.yaku.ContentProvider.userprovider/user");
Cursor cursor = contentResolver.query(selectUri, null, null, null, "userid desc");
while(cursor.moveToNext()){
int id = cursor.getInt(cursor.getColumnIndex("userid"));
String name = cursor.getString(cursor.getColumnIndex("name"));
int age = cursor.getInt(cursor.getColumnIndex("age"));
Log.i(TAG, "id="+ id + ",name="+ name+ ",age="+ age);
}
}
}
}
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
相关文章推荐
- Android开发学习之使用ContentProvider实现数据共享
- 无废话Android之listview入门,自定义的数据适配器、采用layoutInflater打气筒创建一个view对象、常用数据适配器ArrayAdapter、SimpleAdapter、使用ContentProvider（内容提供者）共享数据、短信的备份、插入一条记录到系统短信应用（3）
- 5.4、Android中数据存储和访问-使用ContentProvider共享数据
- Android学习19--使用ContentProvider实现数据共享
- Android共享数据ContentProvider的使用
- Android深入探究笔记之十 -- 使用 ContentProvider 共享数据（二），访问与添加通讯录
- 我的android 第21天 - 使用ContentProvider共享数据
- 使用android中ContentProvider组件对外共享以及监听ContentProvider中数据的变化
- Android学习之 使用ContentProvider实现数据共享
- Android深入探究笔记之十 -- 使用 ContentProvider 共享数据（二），访问与添加通讯录
- Android之使用Contentprovider对外共享数据和实现数据监听变化
- Android四大组件之使用ContentProvider实现数据共享
- Android 使用ContentProvider对外共享数据与监听ContentProvider数据的变化
- Android 之使用ContentProvider（内容提供者）共享数据
- Android应用使用ContentProvider共享数据
- Android疑惑之使用ContentProvider实现数据共享
- Android疑惑之使用ContentProvider实现数据共享
- android学习：使用它ContentProvider获取其他程序共享的数据
- Android 使用ContentProvider（内容提供者）共享数据
- Android：使用ContentProvider共享数据