我正在开发一个使用 SQlite 数据库的应用程序。我的应用程序在每个操作系统版本和所有模拟器中都运行良好，但它只会在操作系统版本为 2.3.3的设备中产生问题。我收到 CREATE TABLE android_metadata 消息并且我的数据库代码崩溃。
我正在使用带有 Android OS 2.3.3 的 Google Nexus
请建议我什么是实际问题以及我可以做些什么来解决这个设备相关问题。我也在下面发布我的代码：
public class ECatalogueDatabase {
private static final String DB_PATH = "/data/data/com.weg.ecatalogue/databases/";
public static final String DATABASE_NAME = "ECatalogue";
public static final String DATABASE_TABLE = "T_Electrical";
public static final int DATABASE_VERSION = 1;
public static final String KEY_ROWID="id";
public static final String KEY_PRODUCT_LINE="productline";
public static final String KEY_VOLTAGE="voltage";
public static final String KEY_OUTPUTHP="outputhp";
public static final String KEY_FRAME="frame";
public static final String KEY_RPM="rpm";
private Context context=null;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
/**
* Database creation sql statement
*/
private static final String CREAT_DATABASE="Create Table if not exists "+ DATABASE_TABLE+"("+ KEY_ROWID +" INTEGER PRIMARY KEY NOT NULL,"
+KEY_PRODUCT_LINE +" nvarchar ,"+ KEY_OUTPUTHP+" numeric ,"+ KEY_RPM +" nvarchar ,"+KEY_VOLTAGE +" nvarchar ," +KEY_FRAME +" nvarchar"+")";
/**
* Constructor - takes the context to allow the database to be
* opened/created
*
* @param ctx the Context within which to work
*/
public ECatalogueDatabase(Context ctx) {
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
//Helper class
private static class DatabaseHelper extends SQLiteOpenHelper
{
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREAT_DATABASE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS titles");
onCreate(db);
}
}
public ECatalogueDatabase open() //throws SQLException
{
try
{
db=DBHelper.getWritableDatabase();
}catch(Exception exception)
{
exception.printStackTrace();
}
return null;
}
public void close()
{
DBHelper.close();
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
public void createDataBase() throws IOException{
@SuppressWarnings("unused")
boolean dbExist = checkDataBase();
SQLiteDatabase db_Read = null;
if(dbExist){
//DO NOTHING IN THIS CASE
}else{
db_Read = DBHelper.getReadableDatabase();
db_Read.close();
}
//=================================
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
/**
* Check if the database already exist to avoid re-copying the file each time you open the application.
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase(){
try{
String myPath = DB_PATH + DATABASE_NAME;
db = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
}
if(db != null){
db.close();
}
return db != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created empty database in the
* system folder, from where it can be accessed and handled.
* This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException{
InputStream myInput = context.getAssets().open(DATABASE_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DATABASE_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
public int getDatabaseCount(){
int count = 0;
Cursor cursor = db.rawQuery("Select * from " + DATABASE_TABLE, null);
if(cursor!=null){
count = cursor.getCount();
}
cursor.deactivate();
cursor.close();
return count;
}
}
我的日志：
5CREATE TABLE android_metadata failed
Failed to setLocale() when constructing, closing the database
a
at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method)
at android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java1987)
at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java1855)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java820)
at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java854)
at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java847)
at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java567)
at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java203)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java118)
at com.weg.ecatalogue.database.ECatalogueDatabase.open(ECatalogueDatabase.java76)
at com.weg.ecatalogue.HomeScreen.onCreate(HomeScreen.java219)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java1722)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java1784)
at android.app.ActivityThread.access$00(ActivityThread.java123)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java939)
at android.os.Handler.dispatchMessage(Handler.java99)
at android.os.Looper.loop(Looper.java123)
at android.app.ActivityThread.main(ActivityThread.java3839)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java841)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java599)
at dalvik.system.NativeStart.main(Native Method)
Deleting and re-creating corrupt database /data/data/com.weg.ecatalogus/ECatalogue
a
at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method)
at android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java1987)
at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java1855)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java820)
at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java854)
at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java847)
at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java567)
at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java203)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java118)
at com.weg.ecatalogue.database.ECatalogueDatabase.open(ECatalogueDatabase.java76)
at com.weg.ecatalogue.HomeScreen.onCreate(HomeScreen.java219)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java1722)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java1784)
at android.app.ActivityThread.access$00(ActivityThread.java123)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java939)
at android.os.Handler.dispatchMessage(Handler.java99)
at android.os.Looper.loop(Looper.java123)
at android.app.ActivityThread.main(ActivityThread.java3839)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java841)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java599)
at dalvik.system.NativeStart.main(Native Method)