将imageview转换为base64字符串

Question

can i use base64 string converter in android imageview ? if yes then how..please help.. i try out with this following code..

ImageView iv;
iv=(ImageView) findViewById(R.id.imageView1);
iv.buildDrawingCache();
Bitmap bitmap = iv.getDrawingCache();
ByteArrayOutputStream stream=new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
byte[] image=stream.toByteArray();
String img_str = Base64.encodeToString(image, 0);

then i want to send img_str as a json data into my server..please help guys

Answer 1

You can decode the string that you just encoded and get the image back by doing something like the following:

byte[] decodedString = Base64.decode(strBase64, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length); 
image.setImageBitmap(decodedByte);

And u can send string to server this way :

 JSONObject jsonObj = new JSONObject(ur_string);

Answer 2

You need to do two steps

1. create byte array from ImageView (drawable)

Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.images);   
//R.drawable.images is image for my ImageView
ByteArrayOutputStream stream=new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
byte[] imageByteArray=stream.toByteArray();
System.out.println("byte array:"+ imageByteArray);

2. convert byte array to base64 string

String img_str = Base64.encodeToString(imageByteArray, 0);
System.out.println("string:"+img_str);

Cheers!!