java - 使用 Firebase 云和 Java 向单个设备发送消息

Question

我正在尝试使用 Java 应用程序中的 token 将消息发送到单个设备。我正在使用 Firebase 管理 SDK。以下是我所拥有的

    FileInputStream serviceAccount = null;
    try {
        serviceAccount = new FileInputStream("google-services.json");
    } catch (FileNotFoundException e2) {
        e2.printStackTrace();
    }

    FirebaseOptions options = null;
    try {
        options = new FirebaseOptions.Builder()
            .setCredentials(GoogleCredentials.fromStream(serviceAccount))
            .setDatabaseUrl("https://MYPROJECTID.firebaseio.com/")
            .build();
    } catch (IOException e1) {
        e1.printStackTrace();
    }

    FirebaseApp.initializeApp(options);

    String registrationToken = "MYDEVICETOKEN";

    // See documentation on defining a message payload.
    Message message = Message.builder().putData("time", "2:45").setToken(registrationToken)
            .build();

    // Send a message to the device corresponding to the provided
    // registration token.
    String response = null;
    try {
        response = FirebaseMessaging.getInstance().sendAsync(message).get();
    } catch (InterruptedException | ExecutionException e) {
        e.printStackTrace();
    }
    // Response is a message ID string.
    System.out.println("Successfully sent message: " + response);

但是我得到以下异常

java.io.IOException: Error reading credentials from stream, 'type' field not specified.

我在这里做错了什么？

Answer 1

单击“生成新私钥”按钮。