【Android基础知识】ContentProvider（二）自定义ContentProvider和URI
2016-06-06 11:45
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在Android平台上创建ContentProvider，相对而言是很容易的。你所需做的就是继承ContentProvider这个抽象类，然后重新它里面的各种方法。
下面将介绍如何创建一个ContentProvider，用来存储一些图书的信息。
1. 使用Eclipse创建一个工程，ContentProviders。
2. 新建一个名为BooksProvider类。
3. BooksProvider.Java中的代码。
[java] view
plain copy
public class BooksProvider extends ContentProvider
{
static final String PROVIDER_NAME =
"net.manoel.provider.Books";
static final Uri CONTENT_URI =
Uri.parse("content://"+ PROVIDER_NAME + "/books");
static final String _ID = "_id";
static final String TITLE = "title";
static final String ISBN = "isbn";
static final int BOOKS = 1;
static final int BOOK_ID = 2;
private static final UriMatcher uriMatcher;
static{
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI(PROVIDER_NAME, "books", BOOKS);
uriMatcher.addURI(PROVIDER_NAME, "books/#", BOOK_ID);
}
//---for database use---
SQLiteDatabase booksDB;
static final String DATABASE_NAME = "Books";
static final String DATABASE_TABLE = "titles";
static final int DATABASE_VERSION = 1;
static final String DATABASE_CREATE =
"create table " + DATABASE_TABLE +
" (_id integer primary key autoincrement, "
+ "title text not null, isbn text not null);";
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion) {
Log.w("Content provider database",
"Upgrading database from version " +
oldVersion + " to " + newVersion +
", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS titles");
onCreate(db);
}
}
@Override
public int delete(Uri arg0, String arg1, String[] arg2) {
// arg0 = uri
// arg1 = selection
// arg2 = selectionArgs
int count=0;
switch (uriMatcher.match(arg0)){
case BOOKS:
count = booksDB.delete(
DATABASE_TABLE,
arg1,
arg2);
break;
case BOOK_ID:
String id = arg0.getPathSegments().get(1);
count = booksDB.delete(
DATABASE_TABLE,
_ID + " = " + id +
(!TextUtils.isEmpty(arg1) ? " AND (" +
arg1 + ')' : ""),
arg2);
break;
default: throw new IllegalArgumentException("Unknown URI " + arg0);
}
getContext().getContentResolver().notifyChange(arg0, null);
return count;
}
@Override
public String getType(Uri uri) {
switch (uriMatcher.match(uri)){
//---get all books---
case BOOKS:
return "vnd.android.cursor.dir/vnd.manoel.books ";
//---get a particular book---
case BOOK_ID:
return "vnd.android.cursor.item/vnd.manoel.books ";
default:
throw new IllegalArgumentException("Unsupported URI: " + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues values) {
//---add a new book---
long rowID = booksDB.insert(
DATABASE_TABLE,
"",
values);
//---if added successfully---
if (rowID>0)
{
Uri _uri = ContentUris.withAppendedId(CONTENT_URI, rowID);
getContext().getContentResolver().notifyChange(_uri, null);
return _uri;
}
throw new SQLException("Failed to insert row into " + uri);
}
@Override
public boolean onCreate() {
Context context = getContext();
DatabaseHelper dbHelper = new DatabaseHelper(context);
booksDB = dbHelper.getWritableDatabase();
return (booksDB == null)? false:true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder sqlBuilder = new SQLiteQueryBuilder();
sqlBuilder.setTables(DATABASE_TABLE);
if (uriMatcher.match(uri) == BOOK_ID)
//---if getting a particular book---
sqlBuilder.appendWhere(
_ID + " = " + uri.getPathSegments().get(1));
if (sortOrder==null || sortOrder=="")
sortOrder = TITLE;
Cursor c = sqlBuilder.query(
booksDB,
projection,
selection,
selectionArgs,
null,
null,
sortOrder);
//---register to watch a content URI for changes---
c.setNotificationUri(getContext().getContentResolver(), uri);
return c;
}
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
int count = 0;
switch (uriMatcher.match(uri)){
case BOOKS:
count = booksDB.update(
DATABASE_TABLE,
values,
selection,
selectionArgs);
break;
case BOOK_ID:
count = booksDB.update(
DATABASE_TABLE,
values,
_ID + " = " + uri.getPathSegments().get(1) +
(!TextUtils.isEmpty(selection) ? " AND (" +
selection + ')' : ""),
selectionArgs);
break;
default: throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
}
4. 在AndroidManifest.xml中添加声明。
[html] view
plain copy
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="net.manoel.ContentProviders"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="14" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".ContentProvidersActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- 注意使用exported = "true"可以在其他应用程序的Activity或者Service中使用 -->
<provider
android:exported="true"
android:name="BooksProvider"
android:authorities="net.manoel.provider.Books">
</provider>
</application>
</manifest>
在这个例子中，首先创建一个ContentProvider的子类，名字叫BooksProvider。需要重写一些方法：
getTpye() - 返回给定的URI数据的MIME类型
onCreate() - 当provider启动的时候被调用
query() - 接收客户的请求。返回一个Cursor对象。
insert() - 向provider中插入一条新记录
delete() - 在provider中删除一条已存在的记录
update() - 在provider中更新一条已存在的记录
在content provider中，可以任意选择要存储的数据 - 传统的文件，XML，数据库，甚至web service。
接下来，在BooksProvider.java类中定义一些常量：
[java] view
plain copy
static final String PROVIDER_NAME =
"net.manoel.provider.Books";
static final Uri CONTENT_URI =
Uri.parse("content://"+ PROVIDER_NAME + "/books");
static final String _ID = "_id";
static final String TITLE = "title";
static final String ISBN = "isbn";
static final int BOOKS = 1;
static final int BOOK_ID = 2;
private static final UriMatcher uriMatcher;
static{
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI(PROVIDER_NAME, "books", BOOKS);
uriMatcher.addURI(PROVIDER_NAME, "books/#", BOOK_ID);
}
观察上面的代码，使用的一个UriMatcher对象去转换URI，这个URI将会作为一个参数传递给ContentResolver。举个例子，下面的URI代表了请求所有的图书：
content://net.manoel.provider.Books/books
下面的URI代表了请求指定_id 5为的图书：
content://net.manoel.provider.Books/books/5
content provider 使用一个SQlite数据库去存储图书。注意一点，这里使用SQLiteOpenHelper辅助类去操纵数据库：
[java] view
plain copy
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion) {
Log.w("Content provider database",
"Upgrading database from version " +
oldVersion + " to " + newVersion +
", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS titles");
onCreate(db);
}
}
接下来，重写getType()方法，唯一可以描述content provider的数据类型。使用UriMatcher对象，返回vnd.android.cursor.item/vnd.manoel.books代表单独的一本书，vnd.android.cursor.dir/vnd.android.cursor.item/vnd.manoel.bools 代表多本书：
[java] view
plain copy
@Override
public String getType(Uri uri) {
switch (uriMatcher.match(uri)){
//---get all books---
case BOOKS:
return "vnd.android.cursor.dir/vnd.manoel.books ";
//---get a particular book---
case BOOK_ID:
return "vnd.android.cursor.item/vnd.manoel.books ";
default:
throw new IllegalArgumentException("Unsupported URI: " + uri);
}
}
然后，重写onCreate()方法，当provider被开启的时候，和数据库建立建立链接：
[java] view
plain copy
@Override
public boolean onCreate() {
Context context = getContext();
DatabaseHelper dbHelper = new DatabaseHelper(context);
booksDB = dbHelper.getWritableDatabase();
return (booksDB == null)? false:true;
}
然后，重新query()方法：
[java] view
plain copy
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder sqlBuilder = new SQLiteQueryBuilder();
sqlBuilder.setTables(DATABASE_TABLE);
if (uriMatcher.match(uri) == BOOK_ID)
//---if getting a particular book---
sqlBuilder.appendWhere(
_ID + " = " + uri.getPathSegments().get(1));
if (sortOrder==null || sortOrder=="")
sortOrder = TITLE;
Cursor c = sqlBuilder.query(
booksDB,
projection,
selection,
selectionArgs,
null,
null,
sortOrder);
//---register to watch a content URI for changes---
c.setNotificationUri(getContext().getContentResolver(), uri);
return c;
}
查询的结果是一个Cursor对象。
然后，重写insert()方法：
[java] view
plain copy
@Override
public Uri insert(Uri uri, ContentValues values) {
//---add a new book---
long rowID = booksDB.insert(
DATABASE_TABLE,
"",
values);
//---if added successfully---
if (rowID>0)
{
Uri _uri = ContentUris.withAppendedId(CONTENT_URI, rowID);
getContext().getContentResolver().notifyChange(_uri, null);
return _uri;
}
throw new SQLException("Failed to insert row into " + uri);
}
一旦新的记录插入成功，调用ContentResolver的nofityChande()方法。这就通知观察者一个新的记录被更新了。
然后，重新delete()方法：
[java] view
plain copy
@Override
public int delete(Uri arg0, String arg1, String[] arg2) {
// arg0 = uri
// arg1 = selection
// arg2 = selectionArgs
int count=0;
switch (uriMatcher.match(arg0)){
case BOOKS:
count = booksDB.delete(
DATABASE_TABLE,
arg1,
arg2);
break;
case BOOK_ID:
String id = arg0.getPathSegments().get(1);
count = booksDB.delete(
DATABASE_TABLE,
_ID + " = " + id +
(!TextUtils.isEmpty(arg1) ? " AND (" +
arg1 + ')' : ""),
arg2);
break;
default: throw new IllegalArgumentException("Unknown URI " + arg0);
}
getContext().getContentResolver().notifyChange(arg0, null);
return count;
}
最后，重写update()方法：
[java] view
plain copy
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
int count = 0;
switch (uriMatcher.match(uri)){
case BOOKS:
count = booksDB.update(
DATABASE_TABLE,
values,
selection,
selectionArgs);
break;
case BOOK_ID:
count = booksDB.update(
DATABASE_TABLE,
values,
_ID + " = " + uri.getPathSegments().get(1) +
(!TextUtils.isEmpty(selection) ? " AND (" +
selection + ')' : ""),
selectionArgs);
break;
default: throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
使用ContentResolve使用自定义ContentProvider
注意，如果想在其他应用程序的Activity或Service中使用自定义的ContentProvider，要在配置文件中加入 android:exported="true"
文章转自： http://blog.csdn.net/manoel/article/details/10578587
下面将介绍如何创建一个ContentProvider，用来存储一些图书的信息。
1. 使用Eclipse创建一个工程，ContentProviders。
2. 新建一个名为BooksProvider类。
3. BooksProvider.Java中的代码。
[java] view
plain copy
public class BooksProvider extends ContentProvider
{
static final String PROVIDER_NAME =
"net.manoel.provider.Books";
static final Uri CONTENT_URI =
Uri.parse("content://"+ PROVIDER_NAME + "/books");
static final String _ID = "_id";
static final String TITLE = "title";
static final String ISBN = "isbn";
static final int BOOKS = 1;
static final int BOOK_ID = 2;
private static final UriMatcher uriMatcher;
static{
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI(PROVIDER_NAME, "books", BOOKS);
uriMatcher.addURI(PROVIDER_NAME, "books/#", BOOK_ID);
}
//---for database use---
SQLiteDatabase booksDB;
static final String DATABASE_NAME = "Books";
static final String DATABASE_TABLE = "titles";
static final int DATABASE_VERSION = 1;
static final String DATABASE_CREATE =
"create table " + DATABASE_TABLE +
" (_id integer primary key autoincrement, "
+ "title text not null, isbn text not null);";
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion) {
Log.w("Content provider database",
"Upgrading database from version " +
oldVersion + " to " + newVersion +
", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS titles");
onCreate(db);
}
}
@Override
public int delete(Uri arg0, String arg1, String[] arg2) {
// arg0 = uri
// arg1 = selection
// arg2 = selectionArgs
int count=0;
switch (uriMatcher.match(arg0)){
case BOOKS:
count = booksDB.delete(
DATABASE_TABLE,
arg1,
arg2);
break;
case BOOK_ID:
String id = arg0.getPathSegments().get(1);
count = booksDB.delete(
DATABASE_TABLE,
_ID + " = " + id +
(!TextUtils.isEmpty(arg1) ? " AND (" +
arg1 + ')' : ""),
arg2);
break;
default: throw new IllegalArgumentException("Unknown URI " + arg0);
}
getContext().getContentResolver().notifyChange(arg0, null);
return count;
}
@Override
public String getType(Uri uri) {
switch (uriMatcher.match(uri)){
//---get all books---
case BOOKS:
return "vnd.android.cursor.dir/vnd.manoel.books ";
//---get a particular book---
case BOOK_ID:
return "vnd.android.cursor.item/vnd.manoel.books ";
default:
throw new IllegalArgumentException("Unsupported URI: " + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues values) {
//---add a new book---
long rowID = booksDB.insert(
DATABASE_TABLE,
"",
values);
//---if added successfully---
if (rowID>0)
{
Uri _uri = ContentUris.withAppendedId(CONTENT_URI, rowID);
getContext().getContentResolver().notifyChange(_uri, null);
return _uri;
}
throw new SQLException("Failed to insert row into " + uri);
}
@Override
public boolean onCreate() {
Context context = getContext();
DatabaseHelper dbHelper = new DatabaseHelper(context);
booksDB = dbHelper.getWritableDatabase();
return (booksDB == null)? false:true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder sqlBuilder = new SQLiteQueryBuilder();
sqlBuilder.setTables(DATABASE_TABLE);
if (uriMatcher.match(uri) == BOOK_ID)
//---if getting a particular book---
sqlBuilder.appendWhere(
_ID + " = " + uri.getPathSegments().get(1));
if (sortOrder==null || sortOrder=="")
sortOrder = TITLE;
Cursor c = sqlBuilder.query(
booksDB,
projection,
selection,
selectionArgs,
null,
null,
sortOrder);
//---register to watch a content URI for changes---
c.setNotificationUri(getContext().getContentResolver(), uri);
return c;
}
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
int count = 0;
switch (uriMatcher.match(uri)){
case BOOKS:
count = booksDB.update(
DATABASE_TABLE,
values,
selection,
selectionArgs);
break;
case BOOK_ID:
count = booksDB.update(
DATABASE_TABLE,
values,
_ID + " = " + uri.getPathSegments().get(1) +
(!TextUtils.isEmpty(selection) ? " AND (" +
selection + ')' : ""),
selectionArgs);
break;
default: throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
}
4. 在AndroidManifest.xml中添加声明。
[html] view
plain copy
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="net.manoel.ContentProviders"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="14" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".ContentProvidersActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- 注意使用exported = "true"可以在其他应用程序的Activity或者Service中使用 -->
<provider
android:exported="true"
android:name="BooksProvider"
android:authorities="net.manoel.provider.Books">
</provider>
</application>
</manifest>
在这个例子中，首先创建一个ContentProvider的子类，名字叫BooksProvider。需要重写一些方法：
getTpye() - 返回给定的URI数据的MIME类型
onCreate() - 当provider启动的时候被调用
query() - 接收客户的请求。返回一个Cursor对象。
insert() - 向provider中插入一条新记录
delete() - 在provider中删除一条已存在的记录
update() - 在provider中更新一条已存在的记录
在content provider中，可以任意选择要存储的数据 - 传统的文件，XML，数据库，甚至web service。
接下来，在BooksProvider.java类中定义一些常量：
[java] view
plain copy
static final String PROVIDER_NAME =
"net.manoel.provider.Books";
static final Uri CONTENT_URI =
Uri.parse("content://"+ PROVIDER_NAME + "/books");
static final String _ID = "_id";
static final String TITLE = "title";
static final String ISBN = "isbn";
static final int BOOKS = 1;
static final int BOOK_ID = 2;
private static final UriMatcher uriMatcher;
static{
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI(PROVIDER_NAME, "books", BOOKS);
uriMatcher.addURI(PROVIDER_NAME, "books/#", BOOK_ID);
}
观察上面的代码，使用的一个UriMatcher对象去转换URI，这个URI将会作为一个参数传递给ContentResolver。举个例子，下面的URI代表了请求所有的图书：
content://net.manoel.provider.Books/books
下面的URI代表了请求指定_id 5为的图书：
content://net.manoel.provider.Books/books/5
content provider 使用一个SQlite数据库去存储图书。注意一点，这里使用SQLiteOpenHelper辅助类去操纵数据库：
[java] view
plain copy
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion) {
Log.w("Content provider database",
"Upgrading database from version " +
oldVersion + " to " + newVersion +
", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS titles");
onCreate(db);
}
}
接下来，重写getType()方法，唯一可以描述content provider的数据类型。使用UriMatcher对象，返回vnd.android.cursor.item/vnd.manoel.books代表单独的一本书，vnd.android.cursor.dir/vnd.android.cursor.item/vnd.manoel.bools 代表多本书：
[java] view
plain copy
@Override
public String getType(Uri uri) {
switch (uriMatcher.match(uri)){
//---get all books---
case BOOKS:
return "vnd.android.cursor.dir/vnd.manoel.books ";
//---get a particular book---
case BOOK_ID:
return "vnd.android.cursor.item/vnd.manoel.books ";
default:
throw new IllegalArgumentException("Unsupported URI: " + uri);
}
}
然后，重写onCreate()方法，当provider被开启的时候，和数据库建立建立链接：
[java] view
plain copy
@Override
public boolean onCreate() {
Context context = getContext();
DatabaseHelper dbHelper = new DatabaseHelper(context);
booksDB = dbHelper.getWritableDatabase();
return (booksDB == null)? false:true;
}
然后，重新query()方法：
[java] view
plain copy
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder sqlBuilder = new SQLiteQueryBuilder();
sqlBuilder.setTables(DATABASE_TABLE);
if (uriMatcher.match(uri) == BOOK_ID)
//---if getting a particular book---
sqlBuilder.appendWhere(
_ID + " = " + uri.getPathSegments().get(1));
if (sortOrder==null || sortOrder=="")
sortOrder = TITLE;
Cursor c = sqlBuilder.query(
booksDB,
projection,
selection,
selectionArgs,
null,
null,
sortOrder);
//---register to watch a content URI for changes---
c.setNotificationUri(getContext().getContentResolver(), uri);
return c;
}
查询的结果是一个Cursor对象。
然后，重写insert()方法：
[java] view
plain copy
@Override
public Uri insert(Uri uri, ContentValues values) {
//---add a new book---
long rowID = booksDB.insert(
DATABASE_TABLE,
"",
values);
//---if added successfully---
if (rowID>0)
{
Uri _uri = ContentUris.withAppendedId(CONTENT_URI, rowID);
getContext().getContentResolver().notifyChange(_uri, null);
return _uri;
}
throw new SQLException("Failed to insert row into " + uri);
}
一旦新的记录插入成功，调用ContentResolver的nofityChande()方法。这就通知观察者一个新的记录被更新了。
然后，重新delete()方法：
[java] view
plain copy
@Override
public int delete(Uri arg0, String arg1, String[] arg2) {
// arg0 = uri
// arg1 = selection
// arg2 = selectionArgs
int count=0;
switch (uriMatcher.match(arg0)){
case BOOKS:
count = booksDB.delete(
DATABASE_TABLE,
arg1,
arg2);
break;
case BOOK_ID:
String id = arg0.getPathSegments().get(1);
count = booksDB.delete(
DATABASE_TABLE,
_ID + " = " + id +
(!TextUtils.isEmpty(arg1) ? " AND (" +
arg1 + ')' : ""),
arg2);
break;
default: throw new IllegalArgumentException("Unknown URI " + arg0);
}
getContext().getContentResolver().notifyChange(arg0, null);
return count;
}
最后，重写update()方法：
[java] view
plain copy
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
int count = 0;
switch (uriMatcher.match(uri)){
case BOOKS:
count = booksDB.update(
DATABASE_TABLE,
values,
selection,
selectionArgs);
break;
case BOOK_ID:
count = booksDB.update(
DATABASE_TABLE,
values,
_ID + " = " + uri.getPathSegments().get(1) +
(!TextUtils.isEmpty(selection) ? " AND (" +
selection + ')' : ""),
selectionArgs);
break;
default: throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
使用ContentResolve使用自定义ContentProvider
public class MainActivity extends Activity {
private static final String TAG = "BooksProviderTest";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
testSave();
} catch (Throwable e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void testSave() throws Throwable{
ContentResolver contentResolver =this.getBaseContext().getContentResolver();
Uri insertUri = Uri.parse("content://net.manoel.provider.Books/books");
ContentValues values = new ContentValues();
values.put("title", "lm");
values.put("isbn", "1350000009");
Uri uri = contentResolver.insert(insertUri, values);
Log.i(TAG, uri.toString());
}
public void testUpdate() throws Throwable{
ContentResolver contentResolver = this.getBaseContext().getContentResolver();
Uri updateUri = Uri.parse("content://net.manoel.provider.Books/books1");
ContentValues values = new ContentValues();
values.put("title", "linjiqin");
contentResolver.update(updateUri, values, null, null);
}
public void testFind() throws Throwable{
ContentResolver contentResolver = this.getBaseContext().getContentResolver();
//Uri uri = Uri.parse("content://com.ljq.provider.personprovider/person");
Uri uri = Uri.parse("content://net.manoel.provider.Books/books");
Cursor cursor = contentResolver.query(uri, null, null, null, "id asc");
while(cursor.moveToNext()){
int personid = cursor.getInt(cursor.getColumnIndex("_id"));
String name = cursor.getString(cursor.getColumnIndex("title"));
String phone = cursor.getString(cursor.getColumnIndex("isbn"));
Log.i(TAG, "_id="+ personid + ",title="+ name+ ",isbn="+ phone);
}
cursor.close();
}
public void testDelete() throws Throwable{
ContentResolver contentResolver = this.getBaseContext().getContentResolver();
Uri uri = Uri.parse("content://net.manoel.provider.Books/books/1");
contentResolver.delete(uri, null, null);
}
}运行结果，插入了数据注意，如果想在其他应用程序的Activity或Service中使用自定义的ContentProvider，要在配置文件中加入 android:exported="true"
文章转自： http://blog.csdn.net/manoel/article/details/10578587
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