Android: Sqlite Database Crashes On Returning A Quantity

Database holds name and quantity of medication... what is required to be returned is the quantity corresponding to the medication which is scanned. code for database: public class

Solution 1:

QRcodeReturn() as it is now will only work correctly if it has a proper Context (it needs it for getSharedPreferences() metod to work). It won't work from class `ToolDB.

You should :

• either pass a Context parameter to it
• or alternatively run this method from your activity before using ToolDB class and pass the obtained value to ToolDB class.

For example:

publicStringQRcodeReturn(Context context){

    SharedPreferences codeHack = context.getSharedPreferences(SCAN_RESULT,0);
    String QRcode = codeHack.getString("entry", "unregistered");

    return QRcode;
}

You can then use it from the activity:

Stringcode= QRcodeReturn(this);

and from QuantReturn():

public String QuantReturn(Context context){

   ...
   Stringy= x.QRcodeReturn(context);
   ...
}