本文介绍了如何从strings.xml获取数据库sqlite数据，所以当我更改语言环境时，所有数据都可以转换的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我的数据库中保存了所有数据，我该如何更改它并从字符串，xml中获取数据，所以当我更改语言环境时，所有数据都可以转换为语言环境，这是我的代码:
i have database with all data saved inside it how can i change that and make get the data from strings,xml so when i change the locale all the data can be translated to locale language here is my code:
public class DB_Sqlite extends SQLiteOpenHelper {
public static final String BDname = "data.db";
public static final int DBVERSION = 1; /*<<<<< ADDED BUT NOT NEEDED */
public static final String TABLE_FAVOURITES = "mytable";
public static final String FAVOURITES_COL_ID = BaseColumns._ID; /*<<<< use the Android stock ID name*/
public static final String FAVOURITES_COL_NAME = "name";
public static final String FAVOURITES_COL_FAVOURITEFLAG = "favourite_flag"; /*<<<<< NEW COLUMN */
public DB_Sqlite(@Nullable Context context) {
super(context, BDname, null, DBVERSION /*<<<<< used constant above */);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table " + TABLE_FAVOURITES + " (" +
FAVOURITES_COL_ID + " INTEGER PRIMARY KEY," + /*<<<<< AUTOINCREMENT NOT NEEDED AND IS INEFFICIENT */
FAVOURITES_COL_NAME + " TEXT, " +
FAVOURITES_COL_FAVOURITEFLAG + " INTEGER DEFAULT 0" + /*<<<<< COLUMN ADDED */
")");
/* Note indicator will set to non_favourite i.e. 0 */
ContentValues cv = new ContentValues();
cv.put(FAVOURITES_COL_NAME,"Complex Complex");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Trix Complex");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Kingdoms");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Complex Complex Partner");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Trix Complex Partner");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Kingdoms Partner");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Balot");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Estimation");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Tarneeb 31");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Tarneeb 61");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Tarneeb 41 Syrian");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Tarneeb 41 Egyptian");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Tarneeb 400");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Kasra");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Kasra Partner");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Bent AlSbeet");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Leekha");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Hand 2 Players");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Hand 3 Players");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Hand 4 Players");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Hand 5 Players");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Hand Partner");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Basra 2 Players");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Basra 3 Players");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Basra 4 Players");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Nathalah");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Kout Bo 4");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Kout Bo 6");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Domino 2 Players");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Domino 3 Players");
db.insert(TABLE_FAVOURITES,null,cv);
cv.clear();
cv.put(FAVOURITES_COL_NAME,"Domino 4 Players");
db.insert(TABLE_FAVOURITES,null,cv);
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_FAVOURITES);
onCreate(db);
}
public boolean insertData(String name){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(FAVOURITES_COL_NAME, name);
long result = db.insert(TABLE_FAVOURITES,null, contentValues);
if (result == -1)
return false;
else
return true;
}
public Cursor getFavouriteRows(boolean favourites {
SQLiteDatabase db = this.getWritableDatabase();
String whereclause = FAVOURITES_COL_FAVOURITEFLAG + "=?";
String compare = "<1";
if (favourites) {
compare =">0";
}
return db.query(
TABLE_FAVOURITES,null,
FAVOURITES_COL_FAVOURITEFLAG + compare,
null,null,null,null
);
}
private int setFavourite(long id, boolean favourite_flag) {
SQLiteDatabase db = this.getWritableDatabase();
String whereclause = FAVOURITES_COL_ID + "=?";
String[] whereargs = new String[]{String.valueOf(id)};
ContentValues cv = new ContentValues();
cv.put(FAVOURITES_COL_FAVOURITEFLAG,favourite_flag);
return db.update(TABLE_FAVOURITES,cv,whereclause,whereargs);
}
public int setAsFavourite(long id) {
return setFavourite(id,true);
}
public int setAsNotFavourite(long id) {
return setFavourite(id, false);
}
}
我尝试了R.string.data，但是我得到的只是数字，我没有得到保存在xml中的名称，请帮助我.预先谢谢您...:)
i tried R.string.data but all i get is numbers i dont get the name that is saved in the xml please help me.Thank You in Advance... :)
推荐答案
此示例适用于英语/德语
This example of do it for English/German
字符串资源英文
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">TheApp</string>
<string name="db_bread">Bread</string>
<string name="db_butter">Butter</string>
<string name="db_jam">Jam</string>
<string name="db_toast">Toast</string>
<string name="db_boiledegg">Boiled Egg</string>
<string name="db_friedegg">Fried Egg</string>
<string name="db_poachedegg">Poached Egg</string>
<string name="db_omlette">Omlette</string>
<string name="db_bacon">Bacon</string>
</resources>
德语
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Der App</string>
<string name="db_bread">Brot</string>
<string name="db_butter">Butter</string>
<string name="db_jam">Marmelade</string>
<string name="db_toast">Toast</string>
<string name="db_boiledegg">Gekochtes Ei</string>
<string name="db_friedegg">Spiegelei</string>
<string name="db_poachedegg">Pochiertes Ei</string>
<string name="db_omlette">Omelette</string>
<string name="db_bacon">Speck</string>
</resources>
- db _ 放在想要的阵列之前，以减少阵列数. 建议使用
- 文件名创建语言环境目录和资源文件
- db_ before wanted ones to make less array.
- filenames advised as Create locale directories and resource files
StringResourcesHandling
public class StringResourcesHandling {
private static final String[] allowedStringResourcePrefixes = new String[]{"db_"};
private static boolean loaded = false;
private static Field[] fields = R.string.class.getFields();
private static ArrayList<String> allowedStringResourceNames = new ArrayList<>();
private static void loadStringResources() {
if (loaded) return;
for (Field f: fields) {
if (isResourceNameAllowedPrefix(f.getName())) {
allowedStringResourceNames.add(f.getName());
}
}
loaded = true;
}
private static boolean isResourceNameAllowedPrefix(String resourceName) {
if (allowedStringResourcePrefixes.length < 1) return true;
for (String s: allowedStringResourcePrefixes) {
if (resourceName.substring(0,s.length()).equals(s)) return true;
}
return false;
}
public static String getStringByName(Context context, String name) {
String rv = "";
boolean nameFound = false;
if (!loaded) {
loadStringResources();
}
for (String s: allowedStringResourceNames) {
if (s.equals(name)) {
nameFound = true;
break;
}
}
if (!nameFound) return rv;
return context.getString(context.getResources().getIdentifier(name,"string",context.getPackageName()));
}
public static List<String> getAllStringResourceNames() {
if (!loaded) {
loadStringResources();
}
return allowedStringResourceNames;
}
}
- 做得很快，所以可能会好起来 如果需要，
- 将执行许多前缀(不仅仅是 db _ )，但可能会错误地测试多个前缀.
- done fastly so might be bettered
- will do many prefixes (more than just db_) if needed but might wrong no tested more than 1.
您的DB_Sqlite类仅更改和添加了方法
Your DB_Sqlite class changed and added methods only
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table " + TABLE_FAVOURITES + " (" +
FAVOURITES_COL_ID + " INTEGER PRIMARY KEY," + /*<<<<< AUTOINCREMENT NOT NEEDED AND IS INEFFICIENT */
FAVOURITES_COL_NAME + " TEXT, " +
FAVOURITES_COL_FAVOURITEFLAG + " INTEGER DEFAULT 0" + /*<<<<< COLUMN ADDED */
")");
/* CHANGES HERE BELOW loop adding all Resource names NOT VALUES */
ContentValues cv = new ContentValues();
for (String s: StringResourcesHandling.getAllStringResourceNames()) {
cv.clear();
cv.put(FAVOURITES_COL_NAME,s); //<<<<<<<<<< Name of the resource
db.insert(TABLE_FAVOURITES,null,cv);
}
}
/* Getting everything and make MatrixCursor VALUES from Resource names from Cursor with Resource names */
public Cursor getAllDataInCurrentLocale(Context context) {
SQLiteDatabase db = this.getWritableDatabase();
Cursor csr = db.query(TABLE_FAVOURITES,null,null,null,null,null,null);
if (csr.getCount() < 1) return csr;
MatrixCursor mxcsr = new MatrixCursor(csr.getColumnNames(),csr.getCount());
while (csr.moveToNext()) {
mxcsr.addRow(convertCursorRow(context,csr,new String[]{FAVOURITES_COL_NAME}));
}
csr.close();
return mxcsr;
}
/* This getting columns from Cursor into String array (no BLOB handleing)*/
private String[] convertCursorRow(Context context, Cursor csr, String[] columnsToConvert) {
String[] rv = new String[csr.getColumnCount()];
for (String s: csr.getColumnNames()) {
boolean converted = false;
for (String ctc: columnsToConvert) {
if (csr.getType(csr.getColumnIndex(s)) == Cursor.FIELD_TYPE_BLOB) {
//........ would have to handle BLOB here if needed (another question if needed)
}
if (ctc.equals(s)) {
rv[csr.getColumnIndex(s)] = StringResourcesHandling.getStringByName(context,csr.getString(csr.getColumnIndex(s)));
converted = true;
}
} if (!converted) {
rv[csr.getColumnIndex(s)] = csr.getString(csr.getColumnIndex(s));
}
}
return rv;
}
活动测试
public class MainActivity extends AppCompatActivity {
DB_Sqlite dbSqlite;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* Show the resources for demo */
for(String s: StringResourcesHandling.getAllStringResourceNames()) {
Log.d("RESOURCEDATA","String Resource Name = " + s +
"\n\tValue = " + StringResourcesHandling.getStringByName(this,s)
);
}
dbSqlite = new DB_Sqlite(this);
Cursor csr = dbSqlite.getAllDataInCurrentLocale(this);
DatabaseUtils.dumpCursor(csr);
csr.close();
}
}
此操作记录到日志英语:-
2020-01-04 21:50:43.105 18344-18344/? D/RESOURCEDATA: String Resource Name = db_bacon
Value = Bacon
2020-01-04 21:50:43.105 18344-18344/? D/RESOURCEDATA: String Resource Name = db_boiledegg
Value = Boiled Egg
2020-01-04 21:50:43.106 18344-18344/? D/RESOURCEDATA: String Resource Name = db_bread
Value = Bread
2020-01-04 21:50:43.106 18344-18344/? D/RESOURCEDATA: String Resource Name = db_butter
Value = Butter
2020-01-04 21:50:43.106 18344-18344/? D/RESOURCEDATA: String Resource Name = db_friedegg
Value = Fried Egg
2020-01-04 21:50:43.106 18344-18344/? D/RESOURCEDATA: String Resource Name = db_jam
Value = Jam
2020-01-04 21:50:43.106 18344-18344/? D/RESOURCEDATA: String Resource Name = db_omlette
Value = Omlette
2020-01-04 21:50:43.106 18344-18344/? D/RESOURCEDATA: String Resource Name = db_poachedegg
Value = Poached Egg
2020-01-04 21:50:43.106 18344-18344/? D/RESOURCEDATA: String Resource Name = db_toast
Value = Toast
2020-01-04 21:50:43.119 18344-18344/? I/System.out: >>>>> Dumping cursor android.database.MatrixCursor@283a643
2020-01-04 21:50:43.119 18344-18344/? I/System.out: 0 {
2020-01-04 21:50:43.119 18344-18344/? I/System.out: _id=1
2020-01-04 21:50:43.119 18344-18344/? I/System.out: name=Bacon
2020-01-04 21:50:43.119 18344-18344/? I/System.out: favourite_flag=0
2020-01-04 21:50:43.119 18344-18344/? I/System.out: }
2020-01-04 21:50:43.119 18344-18344/? I/System.out: 1 {
2020-01-04 21:50:43.119 18344-18344/? I/System.out: _id=2
2020-01-04 21:50:43.119 18344-18344/? I/System.out: name=Boiled Egg
2020-01-04 21:50:43.119 18344-18344/? I/System.out: favourite_flag=0
2020-01-04 21:50:43.119 18344-18344/? I/System.out: }
2020-01-04 21:50:43.119 18344-18344/? I/System.out: 2 {
2020-01-04 21:50:43.119 18344-18344/? I/System.out: _id=3
2020-01-04 21:50:43.119 18344-18344/? I/System.out: name=Bread
2020-01-04 21:50:43.119 18344-18344/? I/System.out: favourite_flag=0
2020-01-04 21:50:43.119 18344-18344/? I/System.out: }
2020-01-04 21:50:43.119 18344-18344/? I/System.out: 3 {
2020-01-04 21:50:43.119 18344-18344/? I/System.out: _id=4
2020-01-04 21:50:43.119 18344-18344/? I/System.out: name=Butter
2020-01-04 21:50:43.119 18344-18344/? I/System.out: favourite_flag=0
2020-01-04 21:50:43.119 18344-18344/? I/System.out: }
2020-01-04 21:50:43.119 18344-18344/? I/System.out: 4 {
2020-01-04 21:50:43.120 18344-18344/? I/System.out: _id=5
2020-01-04 21:50:43.120 18344-18344/? I/System.out: name=Fried Egg
2020-01-04 21:50:43.120 18344-18344/? I/System.out: favourite_flag=0
2020-01-04 21:50:43.120 18344-18344/? I/System.out: }
2020-01-04 21:50:43.120 18344-18344/? I/System.out: 5 {
2020-01-04 21:50:43.120 18344-18344/? I/System.out: _id=6
2020-01-04 21:50:43.120 18344-18344/? I/System.out: name=Jam
2020-01-04 21:50:43.120 18344-18344/? I/System.out: favourite_flag=0
2020-01-04 21:50:43.120 18344-18344/? I/System.out: }
2020-01-04 21:50:43.120 18344-18344/? I/System.out: 6 {
2020-01-04 21:50:43.120 18344-18344/? I/System.out: _id=7
2020-01-04 21:50:43.120 18344-18344/? I/System.out: name=Omlette
2020-01-04 21:50:43.121 18344-18344/? I/System.out: favourite_flag=0
2020-01-04 21:50:43.121 18344-18344/? I/System.out: }
2020-01-04 21:50:43.121 18344-18344/? I/System.out: 7 {
2020-01-04 21:50:43.121 18344-18344/? I/System.out: _id=8
2020-01-04 21:50:43.121 18344-18344/? I/System.out: name=Poached Egg
2020-01-04 21:50:43.121 18344-18344/? I/System.out: favourite_flag=0
2020-01-04 21:50:43.121 18344-18344/? I/System.out: }
2020-01-04 21:50:43.121 18344-18344/? I/System.out: 8 {
2020-01-04 21:50:43.121 18344-18344/? I/System.out: _id=9
2020-01-04 21:50:43.122 18344-18344/? I/System.out: name=Toast
2020-01-04 21:50:43.122 18344-18344/? I/System.out: favourite_flag=0
2020-01-04 21:50:43.122 18344-18344/? I/System.out: }
2020-01-04 21:50:43.122 18344-18344/? I/System.out: <<<<<
然后对日志德语执行操作(资源数据未显示为未更改)
Then do to the log German (RESOURCEDATA not see as no changed)
2020-01-04 21:53:06.220 I/System.out: >>>>> Dumping cursor android.database.MatrixCursor@283a643
2020-01-04 21:53:06.220 I/System.out: 0 {
2020-01-04 21:53:06.220 I/System.out: _id=1
2020-01-04 21:53:06.220 I/System.out: name=Speck
2020-01-04 21:53:06.220 I/System.out: favourite_flag=0
2020-01-04 21:53:06.220 I/System.out: }
2020-01-04 21:53:06.220 I/System.out: 1 {
2020-01-04 21:53:06.220 I/System.out: _id=2
2020-01-04 21:53:06.220 I/System.out: name=Gekochtes Ei
2020-01-04 21:53:06.221 I/System.out: favourite_flag=0
2020-01-04 21:53:06.221 I/System.out: }
2020-01-04 21:53:06.221 I/System.out: 2 {
2020-01-04 21:53:06.221 I/System.out: _id=3
2020-01-04 21:53:06.221 I/System.out: name=Brot
2020-01-04 21:53:06.221 I/System.out: favourite_flag=0
2020-01-04 21:53:06.221 I/System.out: }
2020-01-04 21:53:06.221 I/System.out: 3 {
2020-01-04 21:53:06.221 I/System.out: _id=4
2020-01-04 21:53:06.221 I/System.out: name=Butter
2020-01-04 21:53:06.221 I/System.out: favourite_flag=0
2020-01-04 21:53:06.221 I/System.out: }
2020-01-04 21:53:06.221 I/System.out: 4 {
2020-01-04 21:53:06.221 I/System.out: _id=5
2020-01-04 21:53:06.221 I/System.out: name=Spiegelei
2020-01-04 21:53:06.221 I/System.out: favourite_flag=0
2020-01-04 21:53:06.221 I/System.out: }
2020-01-04 21:53:06.221 I/System.out: 5 {
2020-01-04 21:53:06.221 I/System.out: _id=6
2020-01-04 21:53:06.221 I/System.out: name=Marmelade
2020-01-04 21:53:06.221 I/System.out: favourite_flag=0
2020-01-04 21:53:06.221 I/System.out: }
2020-01-04 21:53:06.221 I/System.out: 6 {
2020-01-04 21:53:06.221 I/System.out: _id=7
2020-01-04 21:53:06.221 I/System.out: name=Omelette
2020-01-04 21:53:06.221 I/System.out: favourite_flag=0
2020-01-04 21:53:06.221 I/System.out: }
2020-01-04 21:53:06.221 I/System.out: 7 {
2020-01-04 21:53:06.221 I/System.out: _id=8
2020-01-04 21:53:06.221 I/System.out: name=Pochiertes Ei
2020-01-04 21:53:06.222 I/System.out: favourite_flag=0
2020-01-04 21:53:06.222 I/System.out: }
2020-01-04 21:53:06.222 I/System.out: 8 {
2020-01-04 21:53:06.222 I/System.out: _id=9
2020-01-04 21:53:06.222 I/System.out: name=Toast
2020-01-04 21:53:06.222 I/System.out: favourite_flag=0
2020-01-04 21:53:06.222 I/System.out: }
2020-01-04 21:53:06.222 I/System.out: <<<<<
这篇关于如何从strings.xml获取数据库sqlite数据，所以当我更改语言环境时，所有数据都可以转换的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！