Question

Im new to android development. Now im trying to use sqlite db. I created a database sqlite file using sqlite manager.
I have tried the following code, it works fine in emulator , but if I took release in device the app crashes ie,it shows an alert message The application CheckMobileForDatabase has stopped unexpectedly, my sdk version is 2.2(8)

 private void StoreDatabase() {
 File DbFile=new File("data/data/com.sqldemo/databases/idua1");
 if(DbFile.exists())
 {
     System.out.println("file already exist ,No need to Create");
 }
 else
 {
     try 
     {
         DbFile.createNewFile();
         System.out.println("File Created successfully");
         InputStream is = this.getAssets().open("idua1.sqlite");
         FileOutputStream fos = new FileOutputStream(DbFile);
         byte[] buffer = new byte[1024];
            int length=0;
            while ((length = is.read(buffer))>0)
            {
            fos.write(buffer, 0, length);
            }
         System.out.println("File succesfully placed on sdcard");
            //Close the streams
            fos.flush();
            fos.close();
            is.close();
     }
     catch (IOException e)
     {
         e.printStackTrace();
     }
   }    
   }

Answer 1

Without your logcat, this is just shooting in the dark.

You could try checking the existence of the file another way:

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;
}

And then run another method to copy the db if it doesn’t exist:

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)) > 0) {
        myOutput.write(buffer, 0, length);
    }
    myOutput.flush();
    myOutput.close();
    myInput.close();
}