在Android 2.X和3.X上使用SQLiteOpenHelper的问题

Question

So i made a big mistake of testing my code on android 4.0 + and thinking it would work fine on other versions. But i am facing issues with 2.X and 3.X with SQLiteOpenHelper.

First the code :

 public class HelperDB extends SQLiteOpenHelper implements BaseColumns {

 public static final int DATABASE_VERSION = 2;
 public static final String DATABASE_NAME = "MYDB.db";
 public static final String TABLE_NAME = "MYtable";
 public static final String TABLE_NAME_LOGO = "MYLogos";
 public static final String COLUMN_NAME_1 = "xxxxx";
 public static final String COLUMN_NAME_2 = "yyyy";
 public static final String COLUMN_NAME_3 = "zzzz";
 public static final String COLUMN_NAME_4 = "aaaa";
 public static final String COLUMN_NAME_LOGO = "logo";
 public static final String COLUMN_NAME_5 = "3333";
 public static final String COLUMN_NAME_6 = "fffff";
 public static final String COLUMN_NAME_7= "Abc";

public HelperDB(Context context)
{
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
 public void onCreate(SQLiteDatabase db){

    db.execSQL("CREATE TABLE " + TABLE_NAME + "(" + _ID + " INTEGER PRIMARY KEY autoincrement," + COLUMN_NAME_1 + " TEXT not null," + COLUMN_NAME_2
            + " TEXT not null," + COLUMN_NAME_3 + " TEXT not null," + COLUMN_NAME_4 + " LONG not null," + COLUMN_NAME_5 + " INT DEFAULT 99," + COLUMN_NAME_6 +" INT DEFAULT 99);");


    db.execSQL("CREATE TABLE " + TABLE_NAME_LOGO + "(" + _ID + " INTEGER PRIMARY KEY autoincrement," + COLUMN_NAME_6 + " TEXT not null,"  +  COLUMN_NAME_7 + " INTERGET not null);");

}

      @Override
   public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}

 }
******************************************************************************

  public class MatchesDB {

private HelperDB dbHelper;  
private SQLiteDatabase dbw, dbr; 
public static int id;

public MatchesDB(Context context){  

    dbHelper = new HelperDB(context); 
    dbw = dbHelper.getWritableDatabase();
    dbr = dbHelper.getReadableDatabase();
}

public void fillinfotable(){}
And all other functions to query the database and delete etc

Creating the DB by calling

      MatchesDB newdb = new MatchesDB(context);
  newdb.fillinfotable();

All this is working perfectly on all 4.0 + devices. However i'm getting the following error when trying to run on 2.x devices

07-14 21:29:14.890: E/Database(22231): CREATE TABLE android_metadata failed
07-14 21:29:14.898: E/Database(22231): CREATE TABLE android_metadata failed
07-14 21:29:15.640: E/Database(22231): Failed to setLocale() when constructing, closing      the database
07-14 21:29:15.640: E/Database(22231): android.database.sqlite.SQLiteException:  database is locked
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method)
07-14 21:29:15.640: E/Database(22231):  at   android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java:2000)
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteDatabase. <init>(SQLiteDatabase.java:1857)
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:822)
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:856)
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:849)
07-14 21:29:15.640: E/Database(22231):  at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:556)
07-14 21:29:15.640: E/Database(22231):  at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)

Any help is Highly appreciated !! really want a quick fix as the app is already on the play store and i need to publish an update

Answer 1

Not sure if it's a kind of the "best practice" but in my app I never keep the db open. I open and close it before/after almost each CRUD action. It works on Android 2.2.

Answer 2

The issue was that i was doing these database operations from a widget using asyntasks. While this works perfectly on android 4.0 + devices, however for lesser versions of android i had to first create an activity and do all the database creation and filling up of tables in the application and then have the widget retrieve and display that data.