详解Android四种存储方式

SharedPreferences.Editor sharedata = getSharedPreferences("data", 0).edit(); sharedata.putString("name","shenrenkui"); sharedata.commit(); 

SharedPreferences sharedata = getSharedPreferences("data", 0); String data = sharedata.getString("name", null); Log.i(TAG,"data="+data); 

//创建文件file = new File(FILE_PATH , FILE_NAME);file.createNewFile();//打开文件file的OutputStreamout = new FileOutputStream(file);String infoToWrite = "纸上得来终觉浅，绝知此事要躬行";//将字符串转换成byte数组写入文件out.write(infoToWrite.getBytes());//关闭文件file的OutputStreamout.close();//打开文件file的InputStreamin = new FileInputStream(file);//将文件内容全部读入到byte数组int length = (int)file.length();byte[] temp = new byte[length];in.read(temp, 0, length);//将byte数组用UTF-8编码并存入display字符串中display = EncodingUtils.getString(temp,TEXT_ENCODING);//关闭文件file的InputStreamin.close();} catch (IOException e) {//将出错信息打印到LogcatLog.e(TAG, e.toString());this.finish();}//从资源读取InputStream is=getResources().getRawResource(R.raw.文件名)

1， adb shell2， cd /data/data/com.android.providers.media/databases3， ls(查看com.android.providers.media下面的数据库)4， sqlite3 internal.db5， .help---看看如何操作6， .table列出internal数据中的表7， select * from albums;DatabaseHelper mOpenHelper;private static final String DATABASE_NAME = "dbForTest.db";private static final int DATABASE_VERSION = 1;private static final String TABLE_NAME = "diary";private static final String TITLE = "title";private static final String BODY = "body";private static class DatabaseHelper extends SQLiteOpenHelper {DatabaseHelper(Context context) {super(context, DATABASE_NAME, null, DATABASE_VERSION);}@Overridepublic void onCreate(SQLiteDatabase db) {String sql = "CREATE TABLE " + TABLE_NAME + " (" + TITLE+ " text not null, " + BODY + " text not null " + ");";Log.i("haiyang:createDB=", sql);db.execSQL(sql);}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}}/*** 重新建立数据表*/private void CreateTable() {SQLiteDatabase db = mOpenHelper.getWritableDatabase();String sql = "CREATE TABLE " + TABLE_NAME + " (" + TITLE+ " text not null, " + BODY + " text not null " + ");";Log.i("haiyang:createDB=", sql);try {db.execSQL("DROP TABLE IF EXISTS diary");db.execSQL(sql);setTitle("数据表成功重建");} catch (SQLException e) {setTitle("数据表重建错误");}}/*** 删除数据表*/private void dropTable() {SQLiteDatabase db = mOpenHelper.getWritableDatabase();String sql = "drop table " + TABLE_NAME;try {db.execSQL(sql);setTitle("数据表成功删除：" + sql);} catch (SQLException e) {setTitle("数据表删除错误");}}/*** 插入两条数据*/private void insertItem() {SQLiteDatabase db = mOpenHelper.getWritableDatabase();String sql1 = "insert into " + TABLE_NAME + " (" + TITLE + ", " + BODY+ ") values('haiyang', 'android的发展真是迅速啊');";String sql2 = "insert into " + TABLE_NAME + " (" + TITLE + ", " + BODY+ ") values('icesky', 'android的发展真是迅速啊');";try {Log.i("haiyang:sql1=", sql1);Log.i("haiyang:sql2=", sql2);db.execSQL(sql1);db.execSQL(sql2);setTitle("插入两条数据成功");} catch (SQLException e) {setTitle("插入两条数据失败");}}/*** 删除其中的一条数据*/private void deleteItem() {try {SQLiteDatabase db = mOpenHelper.getWritableDatabase();db.delete(TABLE_NAME, " title = 'haiyang'", null);setTitle("删除title为haiyang的一条记录");} catch (SQLException e) {}}/*** 在屏幕的title区域显示当前数据表当中的数据的条数。*/private void showItems() {SQLiteDatabase db = mOpenHelper.getReadableDatabase();String col[] = { TITLE, BODY };Cursor cur = db.query(TABLE_NAME, col, null, null, null, null, null);Integer num = cur.getCount();setTitle(Integer.toString(num) + " 条记录");}

* Content Provider Name : Intended Data* Browser : Browser bookmarks, Browser history, etc.* CallLog : Missed calls, Call datails, etc.* Contacts : Contact details* MediaStore : Media files such as audio, Video and Images* Settings : Device Settings and Preferences

<standard_prefix>://<authority>/<data_path>/<id>

Uri allCalls = Uri.parse("content://call_log/calls");Cursor c = managedQuery(allCalls, null, null, null, null);