Android ContentProviders数据共享

1.创建Content Providers

package com.Aina.Android;import android.net.Uri;import android.provider.BaseColumns;/** * com.Aina.Android Pro_ContentProviders *  * @author Aina.huang E-mail: 674023920@qq.com * @version 创建时间：2010 Jul 1, 2010 11:26:31 AM 类说明 */public class NotePad {// Content Providers的URIpublic static final String AUTHORITY = "com.google.android.provider.notepad";private NotePad() {}/** * 定义基本字段 *  * @author Aina_hk *  */public static final class Notes implements BaseColumns {private Notes() {}public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY+ "/notes");// 新的MIME类型-多个public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.google.note";// 新的MIME类型-单个public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.google.note";// 默认排序public static final String DEFAULT_SORT_ORDER = "modified ASC";// 字段public static final String TITLE = "title";public static final String NOTE = "note";public static final String CREATEDDATE = "created";public static final String MODIFIEDDATE = "modified";}}

package com.Aina.Android;import java.util.HashMap;import com.Aina.Android.NotePad.Notes;import android.content.ContentProvider;import android.content.ContentUris;import android.content.ContentValues;import android.content.Context;import android.content.UriMatcher;import android.content.res.Resources;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;import android.database.sqlite.SQLiteQueryBuilder;import android.database.sqlite.SQLiteDatabase.CursorFactory;import android.net.Uri;import android.text.TextUtils;/** * com.Aina.Android Pro_ContentProviders *  * @author Aina.huang E-mail: 674023920@qq.com * @version 创建时间：2010 Jul 1, 2010 11:55:55 AM 类说明 */public class NotePadProvider extends ContentProvider {public static final String DATABASE_NAME = "test.db";public static final String TABLE_NAME = "notes";public static final int VERSION = 1;public static final int NOTES = 1;public static final int NOTE_ID = 2;public static HashMap<String, String> hm = null;public static UriMatcher mUriMatcher = null;public static final String CREATE_TABLE = "CREATE TABLE " + TABLE_NAME+ " (" + Notes._ID + " INTEGER PRIMARY KEY," + Notes.TITLE+ " TEXT," + Notes.NOTE + " TEXT," + Notes.CREATEDDATE+ " INTEGER," + Notes.MODIFIEDDATE + " INTEGER)";private SQLiteDataHelper msdh = null;static {mUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);mUriMatcher.addURI(NotePad.AUTHORITY, "notes", NOTES);mUriMatcher.addURI(NotePad.AUTHORITY, "notes/#", NOTE_ID);hm = new HashMap<String, String>();hm.put(Notes._ID, Notes._ID);hm.put(Notes.TITLE, Notes.TITLE);hm.put(Notes.NOTE, Notes.NOTE);hm.put(Notes.CREATEDDATE, Notes.CREATEDDATE);hm.put(Notes.MODIFIEDDATE, Notes.MODIFIEDDATE);}private static class SQLiteDataHelper extends SQLiteOpenHelper {public SQLiteDataHelper(Context context, String name,CursorFactory factory, int version) {super(context, name, factory, version);}@Overridepublic void onCreate(SQLiteDatabase db) {db.execSQL(CREATE_TABLE);}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);this.onCreate(db);}}/** * 删除 */@Overridepublic int delete(Uri uri, String selection, String[] selectionArgs) {SQLiteDatabase db = msdh.getWritableDatabase();int num = 0;switch (mUriMatcher.match(uri)) {case NOTES:num = db.delete(TABLE_NAME, selection, selectionArgs);break;case NOTE_ID:num = db.delete(TABLE_NAME, Notes._ID+ " = "+ uri.getPathSegments().get(1)+ (!TextUtils.isEmpty(selection) ? " AND (" + selection+ ')' : ""), selectionArgs);break;default:break;}this.getContext().getContentResolver().notifyChange(uri, null);return num;}@Overridepublic String getType(Uri uri) {String str = "";switch (mUriMatcher.match(uri)) {case NOTES:str = Notes.CONTENT_TYPE;break;case NOTE_ID:str = Notes.CONTENT_ITEM_TYPE;break;default:throw new IllegalArgumentException("Unknown URI " + uri);}return str;}/** * 插入 */@Overridepublic Uri insert(Uri uri, ContentValues values) {if (mUriMatcher.match(uri) != NOTES) {throw new IllegalArgumentException("Unknown URI " + uri);}ContentValues cv = null;if (values == null) {cv = new ContentValues();} else {cv = new ContentValues(values);}long num = System.currentTimeMillis();if (cv.containsKey(Notes.CREATEDDATE) == false) {cv.put(Notes.CREATEDDATE, num);}if (cv.containsKey(Notes.MODIFIEDDATE) == false) {cv.put(Notes.MODIFIEDDATE, num);}if (cv.containsKey(Notes.TITLE) == false) {Resources r = Resources.getSystem();cv.put(Notes.TITLE, r.getString(android.R.string.untitled));}if (cv.containsKey(Notes.NOTE) == false) {cv.put(Notes.NOTE, "");}SQLiteDatabase db = msdh.getWritableDatabase();long id = db.insertOrThrow(TABLE_NAME, Notes.NOTE, cv);if (id > 0) {Uri uri_new = ContentUris.withAppendedId(uri, id);this.getContext().getContentResolver().notifyChange(uri_new, null);return uri_new;}return null;}@Overridepublic boolean onCreate() {msdh = new SQLiteDataHelper(this.getContext(), TABLE_NAME, null,VERSION);return true;}/** * 查询 */@Overridepublic Cursor query(Uri uri, String[] projection, String selection,String[] selectionArgs, String sortOrder) {SQLiteQueryBuilder qb = new SQLiteQueryBuilder();switch (mUriMatcher.match(uri)) {case NOTES:qb.setTables(TABLE_NAME);qb.setProjectionMap(hm);break;case NOTE_ID:qb.setTables(TABLE_NAME);qb.setProjectionMap(hm);qb.appendWhere(Notes._ID + " = " + uri.getPathSegments().get(1));break;default:throw new IllegalArgumentException("Unknown URI " + uri);}String orderBy = "";if (TextUtils.isEmpty(sortOrder)) {orderBy = Notes.DEFAULT_SORT_ORDER;} else {orderBy = sortOrder;}SQLiteDatabase db = msdh.getReadableDatabase();Cursor cursor = qb.query(db, projection, selection, selectionArgs,null, null, orderBy);cursor.setNotificationUri(this.getContext().getContentResolver(), uri);return cursor;}/** * 更新 */@Overridepublic int update(Uri uri, ContentValues values, String selection,String[] selectionArgs) {SQLiteDatabase db = msdh.getWritableDatabase();int num = 0;switch (mUriMatcher.match(uri)) {case NOTES:num = db.update(TABLE_NAME, values, selection, selectionArgs);break;case NOTE_ID:num = db.update(TABLE_NAME, values, Notes._ID+ " = "+ uri.getPathSegments().get(1)+ (!TextUtils.isEmpty(selection) ? " and (" + selection+ ")" : ""), selectionArgs);default:break;}this.getContext().getContentResolver().notifyChange(uri, null);return num;}}

package com.Aina.Android;import com.Aina.Android.NotePad.Notes;import android.app.Activity;import android.content.ContentValues;import android.database.Cursor;import android.os.Bundle;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.SimpleCursorAdapter;import android.widget.Toast;public class Test extends Activity {/** Called when the activity is first created. */ListView lv = null;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);lv = (ListView) this.findViewById(R.id.ListView01);ContentValues cv = new ContentValues();cv.put(Notes.TITLE, "title1");cv.put(Notes.NOTE, "note1");this.getContentResolver().insert(Notes.CONTENT_URI, cv);cv.clear();cv.put(Notes.TITLE, "title2");cv.put(Notes.NOTE, "note2");this.getContentResolver().insert(Notes.CONTENT_URI, cv);this.displayNote();}private void displayNote() {String[] columns = new String[] { Notes._ID, Notes.TITLE, Notes.NOTE,Notes.CREATEDDATE, Notes.MODIFIEDDATE };Cursor c = this.managedQuery(Notes.CONTENT_URI, columns, null, null,null);this.startManagingCursor(c);if (c != null) {int cs = 0;if(c.isBeforeFirst()){cs++;this.setTitle("isBeforeFirst"+cs);}if(c.moveToFirst()){cs++;this.setTitle("moveToFirst"+cs);}if(c.isFirst()){cs++;this.setTitle("isFirst"+cs);}ListAdapter adapter = new SimpleCursorAdapter(this,android.R.layout.simple_list_item_2, c, new String[] {Notes._ID, Notes.TITLE }, new int[] {android.R.id.text1, android.R.id.text2 });lv.setAdapter(adapter);/* * if (c.moveToFirst()) { this.setTitle(c.getCount()+""); String id = * ""; String title = ""; do { id = * c.getString(c.getColumnIndex(Notes._ID)); title = * c.getString(c.getColumnIndex(Notes.TITLE)); Toast toast = * Toast.makeText(this, c.getPosition()+"|ID:" + id + "|title:" + * title, Toast.LENGTH_LONG); toast.show(); } while * (c.moveToNext()); *  } */}}}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.Aina.Android" android:versionCode="1"android:versionName="1.0"><application android:icon="@drawable/icon"android:label="@string/app_name"><provider android:name=".NotePadProvider"android:readPermission="android.permission.READ_CALENDAR"android:writePermission="android.permission.WRITE_CALENDAR"android:authorities="com.google.android.provider.notepad" /><activity android:name=".Test"android:label="@string/app_name"><intent-filter><action android:name="android.intent.action.MAIN" /><categoryandroid:name="android.intent.category.LAUNCHER" /></intent-filter><intent-filter><dataandroid:mimeType="vnd.android.cursor.dir/vnd.google.note"></data></intent-filter><intent-filter><dataandroid:mimeType="vnd.android.cursor.item/vnd.google.note"></data></intent-filter></activity></application> </manifest>

2.通过ContentResolver来操作数据

package com.gn.provide;import android.app.Activity;import android.content.ContentValues;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.SimpleCursorAdapter;public class Tess extends Activity {/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);String uri = "content://com.google.android.provider.notepad/xixi";String[] columns = new String[] { "_id", "title", "note" };try {/*添加数据ContentValues cv = new ContentValues();cv.put("title", "new title");cv.put("note", "new note");this.getContentResolver().insert(Uri.parse(uri), cv);*//*删除数据int num = this.getContentResolver().delete(Uri.parse(uri), "title='new title'", null);*//*修改ContentValues cv = new ContentValues();cv.put("title", "old title");cv.put("note", "old note");long num = this.getContentResolver().update(Uri.parse(uri), cv, "_id=3", null);this.setTitle("num="+num);*/Cursor c = this.managedQuery(Uri.parse(uri), null, null, null, null);// Cursor c = this.getContentResolver().query(Uri.parse(uri),// columns,// null, null, null);if (c == null) {this.setTitle("c=null");} else {this.startManagingCursor(c);ListView lv = (ListView) this.findViewById(R.id.ListView01);ListAdapter adapter = new SimpleCursorAdapter(this,R.layout.simple, c, columns, new int[] { R.id.ID,R.id.title, R.id.note });lv.setAdapter(adapter);}} catch (Exception ex) {ex.printStackTrace();}}}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.gn.provide"      android:versionCode="1"      android:versionName="1.0">      <uses-permission android:name="android.permission.READ_CALENDAR"></uses-permission>      <uses-permission android:name="android.permission.WRITE_CALENDAR"></uses-permission>    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".Tess"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

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