包含特殊字符的 Firebase 消息

Question

我正在尝试使用 Firebase 云消息传递发送带有特殊字符(如俄语字符(的消息。这里有相关代码：

来自应用发件人：

String message = tv.getText().toString(); //get text from UI text view
....
App myapp = new App.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential).setApplicationName(getString(R.string.app_name)).build();
try {
//send the message to the server
myapp.sendToGroup(new String(message.getBytes(StandardCharsets.UTF_8),
StandardCharsets.UTF_8)).execute();
} catch (IOException e) {
return;
}

从服务器：

Map<String, JsonElement> dataMap = new HashMap<>();
dataMap.put(MSG, new JsonPrimitive(message));
pushMessage.setData(dataMap);
HttpURLConnection conn = null;
URL url = new URL("https://fcm.googleapis.com/fcm/send");
conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
conn.setRequestProperty("project_id", "xxxxxxx");
conn.setRequestProperty("Authorization", "key=" + FCM_API_KEY);
conn.setRequestProperty("Accept", "application/json");
conn.setRequestMethod("POST");
.......//send the request here

应用接收器服务：

public class CloudListenerService extends FirebaseMessagingService {
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
Map<String, String> data = remoteMessage.getData();
String message = data.get(MSG);
if (message == null)
return;
Bundle b = new Bundle();
Intent r = getNewIntent();
b.putString(Receiver.EXTRA_MESSAGE, new String(message.getBytes(StandardCharsets.UTF_8),
StandardCharsets.UTF_8));
sendBroadcast(r);
}
}

我看到的消息是??????它只是意味着编码有问题。从服务器中，我可以看到用%23clip%23%D0%BF%D1%80%D0%B8%D0%BC%D0%B5%D1%80编码的正确字符串(即#clip#пример我发送的文本(。错误在哪里？

Answer 1

发现的问题：我以错误的方式创建了编写器。我将代码从

OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());

自

OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");