public String setMessageLabel(String messageId, String labelName) {
try {
Gmail service =
new Gmail.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
.setApplicationName("Gmail Quickstart")
.build();
// For now assuming that when a label is set, we make it read also.
List<String> labelsToRemove = new ArrayList();
labelsToRemove.add("UNREAD");
List<String> labelsToAdd = new ArrayList();
if (labelName != null) {
// this can be optimized by get all label names once they login
ListLabelsResponse response = service.users().labels().list("me").execute();
List<Label> labels = response.getLabels();
boolean labelExists = false;
for (Label label : labels) {
// System.out.println(label.toPrettyString());
if (label.getName().equalsIgnoreCase(labelName)) {
labelsToAdd.add(label.getId());
System.out.println("Adding label:" + labelName);
labelExists = true;
break;
}
}
if (!labelExists) {
Label label =
new Label()
.setName(labelName)
.setLabelListVisibility("labelShow")
.setMessageListVisibility("show");
label = service.users().labels().create("me", label).execute();
labelsToAdd.add(label.getId());
}
}
ModifyMessageRequest mods;
mods =
new ModifyMessageRequest().setRemoveLabelIds(labelsToRemove).setAddLabelIds(labelsToAdd);
Message message = service.users().messages().modify("me", messageId, mods).execute();
return "success";
} catch (IOException ioe) {
System.out.println("ioerror");
// ioe.printStackTrace();
return "error";
}
}
public static void main(String[] args) throws IOException {
// Build a new authorized API client service.
Gmail service = getGmailService();
// Print the labels in the user's account.
String user = "******";
ListLabelsResponse listResponse = service.users().labels().list(user).execute();
List<Label> labels = listResponse.getLabels();
if (labels.size() == 0) {
System.out.println("No labels found.");
} else {
System.out.println("Labels:");
for (Label label : labels) {
System.out.printf("- %s\n", label.getName());
}
}
}