Question

Android and Web Services

2. (a) What precautions must be taken when sending passwords to a webservice [4 marks and storing them on the server side? [2 marks] (b) What is the purpose of the AsyncTask class? (c) View objects cannot be updated from a background thread, but need to be updated when results come in from background network requests. Explain how this problem can be solved. [3 marks]

Answer 1

Solution :-

2)

a)

The precautions that must be taken when sending the passwords to the webservices and also storing them on the server side are :-

• We have to create a strong and ubique password which contains alphabets,numbers and special symbols.
• Make use of password manager
• Use two factor authentication like One Time Password,On screen Tap to prevent unauthorized logins and access
• We do not have to trust the browser
• Maintain them separated

b) AsyncTask Class :-

The main purpose of this class is it allows the instructions to be run in background and to synchronize again with the main thread.It reports the the progressing of the tasks which are running.It must be used for background operations(short) which needs to update the user interface.

To use this class you,we must subclass it. The parameters of this class are

<TypeOfVarArgParams, ProgressValue, ResultValue>.

It is started with the execute() method.

This inturn calls the "doInBackground()" and the "onPostExecute()" method.

The "TypeOfVarArgParams" is given as input into the doInBackground() method.

The ProgressValue is used for the progress information and the ResultValue must be returned from the method "doInBackground() ".

The doInBackground() method contains coding instructions which are performed in background thread. and this method runs automatically in a separate Thread.

The method onPostExecute() synchronizes again with the UI thread and allows it to be updated.

This method is called by framework,when the doInBackground()method finishes.

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