Databases
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PO
 

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  1. PO
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    <p>You have a function to copy the DB, but you do not show <em>where</em> you are calling it from... that can affect the outcome. I usually call such a thing in the constructor of my db helper class (and it is all contained in there too).</p> <p><strong>EDIT</strong></p> <p>Full example</p> <pre><code>public class DBAdapter { // DB info public static final String MAIN_DATABASE_NAME = "Bowers"; public static final int MAIN_DATABASE_VERSION = 1; public static String MAIN_DB_PATH = "/data/data/cdc.workshopapps.BowersMfgHelper/databases/"; // static strings removed for brevity // database control variables private DatabaseHelper mDbHelper; private static SQLiteDatabase mDb; private static Context mCtx; private static class DatabaseHelper extends SQLiteOpenHelper { DatabaseHelper(Context context, String dbname, int dbversion) { super(context, dbname, null, dbversion); if (checkDataBase(dbname)) { openDataBase(dbname); } else { try { this.getReadableDatabase(); copyDataBase(dbname); this.close(); openDataBase(dbname); } catch (IOException e) { throw new Error("Error copying database"); } Toast.makeText(context, "Initial " + dbname + " database has been created", Toast.LENGTH_LONG).show(); } } @Override public void onCreate(SQLiteDatabase db) { } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } } public DBAdapter(Context ctx) { DBAdapter.mCtx = ctx; } public DBAdapter open(String dbname, int dbversion) throws SQLException { mDbHelper = new DatabaseHelper(mCtx, dbname, dbversion); mDb = mDbHelper.getWritableDatabase(); return this; } public void close() { mDbHelper.close(); } private static void copyDataBase(String dbname) throws IOException { InputStream myInput = mCtx.getAssets().open(dbname); String outFileName = MAIN_DB_PATH + dbname; OutputStream myOutput = new FileOutputStream(outFileName); byte[] buffer = new byte[1024]; int length; while ((length = myInput.read(buffer)) &gt; 0) { myOutput.write(buffer, 0, length); } myOutput.flush(); myOutput.close(); myInput.close(); } private static boolean checkDataBase(String dbname) { SQLiteDatabase checkDB = null; boolean exist = false; try { String db = MAIN_DB_PATH + dbname; checkDB = SQLiteDatabase.openDatabase(db, null, SQLiteDatabase.OPEN_READONLY); } catch (SQLiteException e) { Log.v("db log", "database does't exist"); } if (checkDB != null) { exist = true; checkDB.close(); } return exist; } private static void openDataBase(String dbname) throws SQLException { String dbPath = MAIN_DB_PATH + dbname; mDb = SQLiteDatabase.openDatabase(dbPath, null, SQLiteDatabase.OPEN_READWRITE); } // insert, update, delete and cursor methods follow, removed for brevity } </code></pre> <p>I've used this up to Android 3.2...</p>
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    1. POAndroid SQLite DataBase doesn't work on versions newer than Android 2.1
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      1. PTQuestion
    1. PTAnswer
    1. USBarak
    1. USBarak
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    1. COI use it inside first activity when my app runs... I wrote it in the first code in my question .. check it again :) ... would you please give me the full DBhelper class you use ?
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      1. USMustafa Abdel-Khalik
    2. COUpdated my answer.
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      1. USBarak
    3. COthank you so much
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      1. USMustafa Abdel-Khalik
 

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