[android help] Add Convert to JSONObject

I'm trying to figure out how to add the following data to my json object. Could someone show me how to do this.

{ "main_img":"Base64 String" }

However, the following is the result of using this code, to come out.

final int COMPRESSION_QUALITY = 100;
String encodedImage;
ByteArrayOutputStream byteArrayBitmapStream = new ByteArrayOutputStream();
bitmapPicture.compress(Bitmap.CompressFormat.JPEG, COMPRESSION_QUALITY,
byteArrayBitmapStream);
byte[] b = byteArrayBitmapStream.toByteArray();
encodedImage = "data:image/JPEG;base64," + Base64.encodeToString(b, Base64.DEFAULT);
return encodedImage;

{ "main_img":"Base64 String

It is displayed with }, " is missing.

.

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