How to store and retrieve arraylist having byte array data from shared preferences?

Question

I am trying to save byte array data in arraylist which worked fine as,

            SharedPreferences sPrefs=PreferenceManager.getDefaultSharedPreferences(FirstActivity.this);
            SharedPreferences.Editor sEdit=sPrefs.edit();

            for(int i=0;i<byteArrayList.size();i++)
            {
                sEdit.putString("val"+i,byteArrayList.get(i).toString());
            }
            sEdit.putInt("size",byteArrayList.size());
            sEdit.commit();

I am retrieving byte array data by using,

    SharedPreferences sPrefs = PreferenceManager.getDefaultSharedPreferences(ViewImagesActivity.this);

    myAList=new ArrayList<byte[]>();
    int size=sPrefs.getInt("size",0);

    for(int j=0;j<size;j++)
    {
        myAList.add(sPrefs.getString("val"+j,"")); // giving error for type mismatch for byte[] and string


    }

please help me to sort out this issue..
please tell me if any other way to store and retrieve for this.
Thank you in advance

duggu · Accepted Answer · 2014-06-25 13:11:43Z

1

try below code:-

myAList.add(sPrefs.getString("val"+j,null).getBytes(Charset.forName("UTF-8")));

Error shown because array list type of byte array

 myAList=new ArrayList<byte[]>();

and you add value of string so gives your error .

edited Jun 25, 2014 at 13:11

answered Jun 25, 2014 at 13:04

duggu

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3 Comments

user3707205 Over a year ago

giving this error : The method add(byte[]) in the type ArrayList<byte[]> is not applicable for the arguments (String)

duggu Over a year ago

@user3707205 change string to byte array

user3707205 Over a year ago

I got solution bro.. Thanks for your kind help also... thank you

Green goblin · Accepted Answer · 2014-06-25 13:12:11Z

0

You are trying to store String in a Byte type list:

myAList.add(sPrefs.getString("val"+j,));

You can use int in place of Byte. There is a standard method putInt and getInt for storing and retrieving data in SharedPreferences

edited Jun 25, 2014 at 13:12

answered Jun 25, 2014 at 13:06

Green goblin

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1 Comment

Green goblin Over a year ago

Is it necessary to use Byte array? Can you use int array instead?

Juan Sánchez · Accepted Answer · 2014-06-25 14:50:09Z

0

You have to call the add method with a byte[] parameter. The reverse operation is performed with String.getBytes method, so change the relevant line of your code:

myAList.add(sPrefs.getString("val"+j,"").getBytes());

edited Jun 25, 2014 at 14:50

answered Jun 25, 2014 at 13:09

Juan Sánchez

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2 Comments

jww Over a year ago

The answer was flagged as low quality. Perhaps you could explain how/why the code works to ensure its not deleted.

Juan Sánchez Over a year ago

Oh, low quality? The one who asks the question gave me the thanks as it works, and just for not being verbose in my answer you say it is low quality? :D

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