Question

Good day, i have a requirement where i need to send files(image/videos.. etc) through a bluetooth socket connection. Am using the Bluetooth chat example in the SDK as a guideline. I can connect successfully, but am having trouble converting the files in the sdcard to byte array so i can write it via an outputStream.

i can convert images using the following code:

//After getting the imageId from the cursor object
 Bitmap bitmap = Media.getBitmap(getContentResolver(), imageUri);
ByteArrayOutputStream baos = new ByteArrayOutputStream();

bitmap.compress(Bitmap.CompressFormat.JPEG, 90, baos);
bytes[] bytes = baos.toByteArray();

but having trouble converting videos or other files, should i be using a ObjectOutputStream for all conversion or is there another way i can do this because i can’t seem to convert a fileOutputStream to a byte Array? Thank you

Answer 1

use getContentResolver().openInputStream(uri) to get an InputStream from a URI. and then read the data from inputstream convert the data into byte[] from that inputstream

Try with following code

public byte[] readBytes(Uri uri) throws IOException {
          // this dynamically extends to take the bytes you read
        InputStream inputStream = getContentResolver().openInputStream(uri);
          ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();

          // this is storage overwritten on each iteration with bytes
          int bufferSize = 1024;
          byte[] buffer = new byte[bufferSize];

          // we need to know how may bytes were read to write them to the byteBuffer
          int len = 0;
          while ((len = inputStream.read(buffer)) != -1) {
            byteBuffer.write(buffer, 0, len);
          }

          // and then we can return your byte array.
          return byteBuffer.toByteArray();
        }