How to download and save file from Google Cloud Storage on android?

Question

I am trying out google cloud storage; here is my code:

File file = new File("mydir" + "/" + fileName);
Storage.Objects.Get get = storage.objects().get("bucketname", fileName);
FileOutputStream stream = new FileOutputStream(file);

get.executeAndDownloadTo(stream);
stream.flush();
stream.close();

The download is working ( am not getting any error or crush ) I checked that by setting break point and inspecting the file object. I checked file.exists() which returns true and file.length() which returns 847 byes.

But if I go to my phone and try to access the file I cant find it; also the file I am downloading is a picture file if I try to create a bitmap out of it I always get null.

BitmapFactory.decodeFile(file.getAbsolutePath())

Answer 1

Found a solution; so the issue is with this code:

get.executeAndDownloadTo(stream)

is not downloading the file fully for a reason that I dont know.

Solution: I wrote a simple util method that copies the input stream to output stream byte by byte:

public static void copyStream(InputStream is, OutputStream os) throws Exception {
    final int buffer_size = 4096;

    byte[] bytes = new byte[buffer_size];

    for (int count=0;count!=-1;) {
        count = is.read(bytes);
        if(count != -1) {
            os.write(bytes, 0, count);               
        }
    }

    os.flush();
    is.close();
    os.close();

}

Call:

Utils.copyStream(get.executeMediaAsInputStream(), stream);