Copy Database in assets to data/database work in emulator but not work in device -

i have code: working in emulator fail in devices. want copy database stored in assets data/data/.... when load app apears "error file" (filenotfoundexception e) -> error

public void copiardb() {         try {             string destpath = "/data/data/" + getpackagename()                     + "/databases/mibd";             file f = new file(destpath);             if (!f.exists()) {                 copydb(getbasecontext().getassets().open("datosejer"),                         new fileoutputstream(destpath));             }         } catch (filenotfoundexception e) {             e.printstacktrace();             toast.maketext(mainactivity.this, "error file", toast.length_short)                     .show();         } catch (ioexception e) {             e.printstacktrace();             toast.maketext(mainactivity.this, "error io", toast.length_short)                     .show();         }         adaptadorbd db = new adaptadorbd(this);         // ---obtener todos los contactos---         db.abrir();         cursor c = db.obtenertodoslosdatosejercicio();         if (c.movetofirst()) {             {                 // displaycontact(c);             } while (c.movetonext());         }         db.cerrar();     }      public void copydb(inputstream inputstream, outputstream outputstream)             throws ioexception {         // ---copy 1k bytes @ time---         byte[] buffer = new byte[1024];         int length;         while ((length = inputstream.read(buffer)) > 0) {             outputstream.write(buffer, 0, length);         }         inputstream.close();         outputstream.close();         toast.maketext(mainactivity.this, "se ha copiado la base de datos",                 toast.length_short).show();     } 

i run in emulator , work perfectly, in devices dont work, os of emulator 4.3 , os of devices 4.0.4(rooted),4.0.4 , 4.3.

one line of db is:

14 11107 ovalo con mancuernas 11 hombros 3 12 10 no hay datos utiliza inicialmente las mancuernas con menor peso que encuentres en tu gimnasio para que aprendas el movimiento y dominar el peso. trabajarás la región anterior del hombro. img11107_1.png img11107_2.png img11107_3.png

updated:

i put solution in next comment.

finanlly found de solution:

public void copydb() {     string destpath = "/data/data/" + getpackagename() + "/databases/mibd";     file f2 = new file(destpath);     try {         if (!f2.exists()) {             //create empty file             inputstream istream = getbasecontext().getassets().open(                     "datosejer");             adaptadorbd db = new adaptadorbd(getapplicationcontext());             db.open();             db.close();             outputstream ostream = new fileoutputstream(destpath);             //open file created , write data.             db.open();             byte[] buffer = new byte[1024];             int length;             while ((length = istream.read(buffer)) > 0) {                 ostream.write(buffer, 0, length);             }             istream.close();             ostream.close();             db.close();         }     } catch (ioexception e1) {         e1.printstacktrace();         toast.maketext(mainactivity.this, "error.",                 toast.length_short).show();     } } 

now work in device