public class Book {public static final String   DATABASE_NAME="books.db";public static final String    TABLE_NAME="book";public static final int  VERSION=1;public static final String ID="_id";public static final String TITLE="title";public static final String PRICE ="price";public static final String AUTHORITY="com.android.provider.book";public static final int ITEM=1;public static final int ITEM_ID=2;public static final String CONTENT_TYPE="vnd.android.cursor.dir/vnd.com.android.book";public static final String CONTENT_ITEM_TYPE="vnd.android.cursor.item/vnd.com.android.book";public static final Uri CONTENT_URI = Uri.parse("content://"+AUTHORITY+"/item");
}

package com.android.bookgallery;import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.ContentValues;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;public class BookGallery extends Activity {private class MyrContentObserver extends ContentObserver {public MyrContentObserver() {super(new Handler());}public void onChange(final boolean selfChange) {Log.v("test", "Service ContentObserver received notification");}}MyrContentObserver mObserver;private void registMyContentObserver(){mObserver = new MyrContentObserver();  getContentResolver().registerContentObserver(Book.CONTENT_URI,  true, mObserver);  }private void unregistMyContentObserver(){getContentResolver().unregisterContentObserver(mObserver);}/** Called when the activity is first created. */EditText etTitle;EditText etPrice;Button btnAdd;Button btnDelete;ListView lvBooks;ContentResolver resolver;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);System.out.println("BookGallery: onCreate.... ");setContentView(R.layout.main);etTitle = (EditText) findViewById(R.id.ettitle);etPrice = (EditText) findViewById(R.id.etprice);btnAdd = (Button) findViewById(R.id.add);btnDelete = (Button) findViewById(R.id.delete);lvBooks = (ListView) findViewById(R.id.booklist);resolver = getContentResolver();registMyContentObserver();Cursor cs = resolver.query(Book.CONTENT_URI, null, null, null, Book.ID+ " ASC");CursorAdapter adapter = new SimpleCursorAdapter(this,android.R.layout.simple_list_item_2, cs, new String[] {Book.TITLE, Book.PRICE }, new int[] {android.R.id.text1, android.R.id.text2 });lvBooks.setAdapter(adapter);btnAdd.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubContentValues contentValues;try {String countryText = String.valueOf(etTitle.getText());String codeNum = String.valueOf(etPrice.getText());contentValues = new ContentValues();contentValues.put(Book.TITLE, countryText);contentValues.put(Book.PRICE, codeNum);} catch (Exception e) {contentValues = new ContentValues();}resolver.insert(Book.CONTENT_URI, contentValues);}});btnDelete.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubUri uri = ContentUris.withAppendedId(Book.CONTENT_URI, 2);System.out.println("btnDelete.setOnClickListener...."+ uri.toString());resolver.delete(uri, null, null);}});}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();unregistMyContentObserver();}
}

package com.android.provider.book;import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;public class BookProvider extends ContentProvider {public class BookDatabasehelper extends SQLiteOpenHelper {public BookDatabasehelper(Context context, String name,CursorFactory factory, int version) {super(context, name, factory, version);// TODO Auto-generated constructor stub}@Overridepublic void onCreate(SQLiteDatabase db) {// TODO Auto-generated method stubSystem.out.println("BookDatabasehelper onCreate... ");db.execSQL("CREATE TABLE " + Book.TABLE_NAME + " (" + Book.ID+ " INTEGER PRIMARY KEY," + Book.TITLE + " TEXT,"+ Book.PRICE + " TEXT" + ");");}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {// TODO Auto-generated method stubSystem.out.println("BookDatabasehelper onUpgrade... ");Log.w("BookDatabasehelper", "Upgrading database from version "+ oldVersion + " to " + newVersion+ ", which will destroy all old data");db.execSQL("DROP TABLE IF EXISTS notes");onCreate(db);}}public BookDatabasehelper databasehelper;public static final UriMatcher uriMatcher;static {uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);uriMatcher.addURI(Book.AUTHORITY, "item", Book.ITEM);uriMatcher.addURI(Book.AUTHORITY, "item/#", Book.ITEM_ID);}@Overridepublic int delete(Uri uri, String where, String[] args) {// TODO Auto-generated method stubSystem.out.println("BookProvider delete....");SQLiteDatabase db = databasehelper.getWritableDatabase();int count;switch (uriMatcher.match(uri)) {case Book.ITEM:count = db.delete(Book.TABLE_NAME, where, args);System.out.println("BookProvider delete....count" + count);break;case Book.ITEM_ID:String id = uri.getPathSegments().get(1);count = db.delete(Book.TABLE_NAME,Book.ID+ "="+ id+ (!TextUtils.isEmpty(where) ? " AND (" + where+ ')' : ""), args);System.out.println("BookProvider delete....count" + count + "id="+ id);break;default:throw new IllegalArgumentException("Unknown URI " + uri);}getContext().getContentResolver().notifyChange(uri, null);return count;}@Overridepublic String getType(Uri uri) {// TODO Auto-generated method stubSystem.out.println(" BookProvider getType...");int code = uriMatcher.match(uri);switch (code) {case Book.ITEM:System.out.println(" BookProvider getType..." + Book.CONTENT_TYPE);return Book.CONTENT_TYPE;case Book.ITEM_ID:System.out.println(" BookProvider getType..."+ Book.CONTENT_ITEM_TYPE);return Book.CONTENT_ITEM_TYPE;default:throw new IllegalArgumentException("Unknown URI " + uri);}}@Overridepublic Uri insert(Uri uri, ContentValues values) {// TODO Auto-generated method stubSystem.out.println("BookProvider insert...");SQLiteDatabase db = databasehelper.getWritableDatabase();long rowId;if (uriMatcher.match(uri) != Book.ITEM) {throw new IllegalArgumentException("Unknown URI " + uri);}rowId = db.insert(Book.TABLE_NAME, Book.ID, values);if (rowId > 0) {Uri noteUri = ContentUris.withAppendedId(Book.CONTENT_URI, rowId);System.out.println("BookProvider insert  notifyChange");getContext().getContentResolver().notifyChange(noteUri, null);return noteUri;}throw new SQLException("Failed to insert row into " + uri);}@Overridepublic boolean onCreate() {// TODO Auto-generated method stubSystem.out.println("BookProvider  onCreate:");databasehelper = new BookDatabasehelper(getContext(),Book.DATABASE_NAME, null, Book.VERSION);return true;}@Overridepublic Cursor query(Uri uri, String[] projection, String selection,String[] selectionArgs, String sortOrder) {// TODO Auto-generated method stubSystem.out.println("BookProvider  query:");SQLiteDatabase db = databasehelper.getReadableDatabase();Cursor c;switch (uriMatcher.match(uri)) {case Book.ITEM:c = db.query(Book.TABLE_NAME, projection, selection, selectionArgs,null, null, sortOrder);System.out.println("BookProvider  query:" + Book.CONTENT_TYPE);break;case Book.ITEM_ID:String id = uri.getPathSegments().get(1);c = db.query(Book.TABLE_NAME, projection, Book.ID+ "="+ id+ (!TextUtils.isEmpty(selection) ? " AND (" + selection+ ')' : ""), selectionArgs, null, null, sortOrder);System.out.println("BookProvider  query:" + Book.CONTENT_ITEM_TYPE);break;default:throw new IllegalArgumentException("Unknown URI " + uri);}c.setNotificationUri(getContext().getContentResolver(), uri);return c;}@Overridepublic int update(Uri uri, ContentValues values, String where, String[] args) {// TODO Auto-generated method stubSystem.out.println("BookProviderupdate.... ");SQLiteDatabase db = databasehelper.getWritableDatabase();int count;switch (uriMatcher.match(uri)) {case Book.ITEM:count = db.update(Book.TABLE_NAME, values, where, args);break;case Book.ITEM_ID:String id = uri.getPathSegments().get(1);count = db.update(Book.TABLE_NAME, values,Book.ID+ "="+ id+ (!TextUtils.isEmpty(where) ? " AND (" + where+ ')' : ""), args);break;default:throw new IllegalArgumentException("Unknown URI " + uri);}getContext().getContentResolver().notifyChange(uri, null);return count;}}

<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.android.provider.book"android:versionCode="1"android:versionName="1.0"><application android:icon="@drawable/icon" android:label="@string/app_name"><provider android:name="BookProvider"  android:authorities="com.android.provider.book" /></application><uses-sdk android:minSdkVersion="3" /></manifest>