CODEWITHSUNDEEP
androidsharedpreferences
user3110137
user3110137

Reputation: 147

How to save image base 64 in sharedpreferences?

I used to same the firstName in the SharedPreferences like this:

private String filename = "mySharedString";
private SharedPreferences someData;
someData = getSharedPreferences(filename, 0);
Editor editor = someData.edit();
editor.putString("firstName", phoneNumber);
someData.getString("firstName", "NULL");

It works good. Now I want to save the base 64 of an image that could be 4 MB

Can SharedPreferences be able to save base 64? or that size is large for it ?

Upvotes: 0

Views: 1713

Answers (4)

Vishal Bhingaradiya
Vishal Bhingaradiya

Reputation: 81

Considering your image is at path --> "/sdcard/test.jpg", see the code below

/*Get image into file*/
File image_file = new File("/sdcard/test.jpg");
/*Get absolute path in bitmap*/
Bitmap mBitmap = BitmapFactory.decodeFile(image_file.getAbsolutePath());
/*Instantiate Byte Array Output Stream to compress the bitmap*/
ByteArrayOutputStream bao_stream = new ByteArrayOutputStream();
/*Compress bitmap*/
mBitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
/*Get byteArray from stream*/
byte[] arr_byte_image = bao_stream.toByteArray();
/*Base6e class has a method name encodeToString using which you can get string from byteArray*/
String img_base64_str = Base64.encodeToString(arr_byte_image, 0);`

Now as we have string containing whole image in base64 string format, we can easily store it into SharedPreferences

Please let me know if there is any doubt in above code.

Upvotes: 3

Saqib
Saqib

Reputation: 1129

Try this to save in memory

public void savedImage(byte[] data) {
    InputStream in = new ByteArrayInputStream(data);
    BitmapFactory.Options options = new BitmapFactory.Options();
    Bitmap preview_bitmap = BitmapFactory.decodeStream(in, null, options);
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    preview_bitmap.compress(Bitmap.CompressFormat.JPEG, 70, stream);
    byte[] byteArray = stream.toByteArray();
    final String newData = Base64.encodeToString(byteArray, 0);
    FileOutputStream outStream = null;
    try {
        outStream = new FileOutputStream(new File(
                Environment.getExternalStorageDirectory(), "ImageName.jpg"));
        outStream.write(byteArray);
        outStream.close();
    } catch (FileNotFoundException e) {
        Log.d("No File", e.getMessage());
    } catch (IOException e) {
        Log.d("IO Error", e.getMessage());
    }
}

Upvotes: 2

Satyaki Mukherjee
Satyaki Mukherjee

Reputation: 2879

Though it's bad idea, but you can do this in such a way 

Bitmap photo=BitmapFactory.decodeResource(getResources(), R.drawable.addphoto);

    ByteArrayOutputStream bao = new ByteArrayOutputStream();
                 photo.compress(Bitmap.CompressFormat.JPEG, 100, bao);
                 byte [] ba = bao.toByteArray();
                 String ba1=Base64.encodeBytes(ba);

and store this string ba1 to your `SharedPreferences`

private String filename = "mySharedString";
private SharedPreferences someData;
someData = getSharedPreferences(filename, 0);
Editor editor = someData.edit();
editor.putString("firstName", phoneNumber);
editor.putString("ImageData", ba1);
editor.commit()

I think in this way you will save image in sharedpreferences.

Upvotes: 1

XorOrNor
XorOrNor

Reputation: 8978

Don't do this. The file size of 4MB is way to large for SharedPreferences. SharedPreferences were designed to store private primitive data in key-value pairs and surely not for the files. For storing large files use Internal/External Storage and hold Uri to it in the DB.

Upvotes: 4

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