SampleMediaDrmCallback.java

public final class SampleMediaDrmCallback implements MediaDrmCallback {
  
  private final byte[] keyResponse = "...";

  @Override public byte[] executeProvisionRequest(UUID uuid, ExoMediaDrm.ProvisionRequest request)
      throws IOException {
    throw new UnsupportedOperationException();
  }

  @Override public byte[] executeKeyRequest(UUID uuid, ExoMediaDrm.KeyRequest request)
      throws Exception {
    return keyResponse
    }
  }
}