// This example consumes the tus-java-client and tus-android-client libraries
import io.tus.android.client.TusPreferencesURLStore;
import io.tus.java.client.TusClient;
import io.tus.java.client.TusUpload;
import io.tus.java.client.TusUploader;

// Create a new TusClient instance
TusClient client = new TusClient();

// Configure tus HTTP endpoint. This URL will be used for creating new uploads
// using the Creation extension
client.setUploadCreationURL(new URL("http://tusd.tusdemo.net/files"));

// Enable resumable uploads by storing the upload URL in the preferences
// and preserve them after app restarts
SharedPreferences pref = getSharedPreferences("tus", 0);
client.enableResuming(new TusPreferencesURLStore(pref));

// Open a file using which we will then create a TusUpload. If you do not have
// a File object, you can manually construct a TusUpload using an InputStream.
// See the documentation for more information.
File file = new File("./cute_kitten.png");
final TusUpload upload = new TusUpload(file);

System.out.println("Starting upload...");

// We wrap our uploading code in the TusExecutor class which will automatically catch
// exceptions and issue retries with small delays between them and take fully
// advantage of tus' resumability to offer more reliability.
// This step is optional but highly recommended.
TusExecutor executor = new TusExecutor() {
    @Override
    protected void makeAttempt() throws ProtocolException, IOException {
        // First try to resume an upload. If that's not possible we will create a new
        // upload and get a TusUploader in return. This class is responsible for opening
        // a connection to the remote server and doing the uploading.
        TusUploader uploader = client.resumeOrCreateUpload(upload);

        // Upload the file in chunks of 1KB sizes.
        uploader.setChunkSize(1024);

        // Upload the file as long as data is available. Once the
        // file has been fully uploaded the method will return -1
        do {
            // Calculate the progress using the total size of the uploading file and
            // the current offset.
            long totalBytes = upload.getSize();
            long bytesUploaded = uploader.getOffset();
            double progress = (double) bytesUploaded / totalBytes * 100;

            System.out.printf("Upload at %06.2f%%.\n", progress);
        } while(uploader.uploadChunk() > -1);

        // Allow the HTTP connection to be closed and cleaned up
        uploader.finish();

        System.out.println("Upload finished.");
        System.out.format("Upload available at: %s", uploader.getUploadURL().toString());
    }
};
executor.makeAttempts();