package com.wissen.testApp;
public class ContentProviderDemo extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);displayRecords();}private void displayRecords() {//该数组中包含了所有要返回的字段
     String columns[] = new String[] { People.NAME, People.NUMBER };Uri mContacts = People.CONTENT_URI;Cursor cur = managedQuery(mContacts,columns,  // 要返回的数据字段
       　　null,          // WHERE子句
       　　null,         // WHERE 子句的参数
      　　 null         // Order-by子句
     );if (cur.moveToFirst()) {String name = null;String phoneNo = null;do {// 获取字段的值
         　　 name = cur.getString(cur.getColumnIndex(People.NAME));phoneNo = cur.getString(cur.getColumnIndex(People.NUMBER));Toast.makeText(this, name + ” ” + phoneNo, Toast.LENGTH_LONG).show();} while (cur.moveToNext());}}
}

private void updateRecord(int recNo, String name) {Uri uri = ContentUris.withAppendedId(People.CONTENT_URI, recNo);ContentValues values = new ContentValues();values.put(People.NAME, name);getContentResolver().update(uri, values, null, null);
}

private void insertRecords(String name, String phoneNo) {ContentValues values = new ContentValues();values.put(People.NAME, name);Uri uri = getContentResolver().insert(People.CONTENT_URI, values);Log.d(”ANDROID”, uri.toString());Uri numberUri = Uri.withAppendedPath(uri, People.Phones.CONTENT_DIRECTORY);values.clear();values.put(Contacts.Phones.TYPE, People.Phones.TYPE_MOBILE);values.put(People.NUMBER, phoneNo);getContentResolver().insert(numberUri, values);
}

private void deleteRecords() {Uri uri = People.CONTENT_URI;getContentResolver().delete(uri, null, null);
}

public class MyUsers {public static final String AUTHORITY  = “com.wissen.MyContentProvider”;// BaseColumn类中已经包含了 _id字段
   public static final class User implements BaseColumns {public static final Uri CONTENT_URI  = Uri.parse(”content://com.wissen.MyContentProvider”);// 表数据列
        public static final String  USER_NAME  = “USER_NAME”;}
}

public class MyContentProvider extends ContentProvider {private SQLiteDatabase     sqlDB;private DatabaseHelper    dbHelper;private static final String  DATABASE_NAME = “Users.db”;private static final int  DATABASE_VERSION= 1;private static final String TABLE_NAME= “User”;private static final String TAG = “MyContentProvider”;private static class DatabaseHelper extends SQLiteOpenHelper {DatabaseHelper(Context context) {super(context, DATABASE_NAME, null, DATABASE_VERSION);}@Overridepublic void onCreate(SQLiteDatabase db) {//创建用于存储数据的表
        db.execSQL(”Create table ” + TABLE_NAME + “( _id INTEGER PRIMARY KEY AUTOINCREMENT, USER_NAME TEXT);”);}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {db.execSQL(”DROP TABLE IF EXISTS ” + TABLE_NAME);onCreate(db);}}@Overridepublic int delete(Uri uri, String s, String[] as) {return 0;}@Overridepublic String getType(Uri uri) {return null;}@Overridepublic Uri insert(Uri uri, ContentValues contentvalues) {sqlDB = dbHelper.getWritableDatabase();long rowId = sqlDB.insert(TABLE_NAME, “”, contentvalues);if (rowId > 0) {Uri rowUri = ContentUris.appendId(MyUsers.User.CONTENT_URI.buildUpon(), rowId).build();getContext().getContentResolver().notifyChange(rowUri, null);return rowUri;}throw new SQLException(”Failed to insert row into ” + uri);}@Overridepublic boolean onCreate() {dbHelper = new DatabaseHelper(getContext());return (dbHelper == null) ? false : true;}@Overridepublic Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {SQLiteQueryBuilder qb = new SQLiteQueryBuilder();SQLiteDatabase db = dbHelper.getReadableDatabase();qb.setTables(TABLE_NAME);Cursor c = qb.query(db, projection, selection, null, null, null, sortOrder);c.setNotificationUri(getContext().getContentResolver(), uri);return c;}@Overridepublic int update(Uri uri, ContentValues contentvalues, String s, String[] as) {return 0;}
}

<provider android:name=”MyContentProvider” android:authorities=”com.wissen.MyContentProvider” />

public class MyContentDemo extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);insertRecord(”MyUser”);displayRecords();}private void insertRecord(String userName) {ContentValues values = new ContentValues();values.put(MyUsers.User.USER_NAME, userName);getContentResolver().insert(MyUsers.User.CONTENT_URI, values);}private void displayRecords() {String columns[] = new String[] { MyUsers.User._ID, MyUsers.User.USER_NAME };Uri myUri = MyUsers.User.CONTENT_URI;Cursor cur = managedQuery(myUri, columns,null, null, null );if (cur.moveToFirst()) {String id = null;String userName = null;do {id = cur.getString(cur.getColumnIndex(MyUsers.User._ID));userName = cur.getString(cur.getColumnIndex(MyUsers.User.USER_NAME));Toast.makeText(this, id + ” ” + userName, Toast.LENGTH_LONG).show();} while (cur.moveToNext());}}
}