如何将用户添加到角色中

Question

我正试图在我的注册功能中为用户分配一个角色。

通过使用以下代码：

try {
    role.save(new CloudRoleCallback() {
    @Override
    public void done(CloudRole cloudRole, CloudException t) throws     CloudException {
        if(cloudRole != null){
            System.out.println("Adding user role"+ ""+   cloudRole.getRoleName());
            userObj.addToRole(role, new CloudUserCallback() {
                @Override
                public void done(CloudUser cloudUser, CloudException e) throws CloudException {
                    if(cloudUser != null){
                        System.out.println("role in role added successfully");
                        }
                    if(e != null){
                        e.printStackTrace();
                        }
                }
            });
        }
        if( t != null){
            t.printStackTrace();
                }
    }
});

} 
userObj.signUp(new CloudUserCallback() {
    @Override
    public void done(CloudUser cloudUser, CloudException e) throws  CloudException {
    if (cloudUser != null) {
        onSignupSuccess();
       }
    if (e != null) {
        e.printStackTrace();
        error = e.getMessage();
        error = error.substring(error.indexOf(""));
        onSignupFailed();
        progressDialog.dismiss();
        }
    }
});

当我试图运行上面的代码时，我得到了以下错误。

E/AndroidRuntime：致命异常：AsyncTask#2进程：info,pid：967 java.lang.runtimeException：在Android.os.AsyncTask$3处执行doInBackground（）时发生错误。done(AsyncTask.java:300)在java.util.concurrent.futuretask.finishCompletion(FutureTask.java:355)在java.util.concurrent.futureTask.setException(FutureTask.java:222)在java:231)在java.util.concurrent.ThreadPoolExecutor.runworker（ThreadPoolExecutor.java:1112)在java.util.concurrent.ThreadPoolExecutor$worker.run（ThreadPoolExecutor.java:587)在java.lang.thread.run（ThreadPoolExecutor.java:818)在java.lang.thread.run（ThreadPoolExecutor.java:587)，原因是：java.lang.nullPointerException：试图在(jsonObject.java:324)位于io.cloudboost.clouduser.addtocom.rakesh_kr.msrit_info.signup$signupclass$1的角色(clouduser.java:317)。done(signup.java:149)在io.cloudboost.cloudrole.save(cloudrole.java:83)在com.rakesh_kr.msrit_info.signup$signupclass.doinbackground(signup.java:144)在com.rakesh_kr.msrit_info.signup.doinbackground(signup.java:126)k.java:237)位于Android.os.asynctask$SerialExecutor$1.run(asynctask.java:231) 在java.util.concurrent.ThreadPoolExecutor.RunWorker(ThreadPoolExecutor.java:1112) 在java.util.concurrent.ThreadPoolExecutor$worker.run（ThreadPoolExecutor.java:587) 在java.lang.thread.run处(thread.java:818)

Answer 1

@kr Rakesh您的调用顺序是错误的，您实际上是在对一个不存在的用户调用addtorole，因为您的user.signup是在序列的后面调用的。
您应该这样做:

1. 注册
2. 在注册回调的done方法中创建和保存角色
3. 调用addtorole内部done方法的role.savecallback

下面是我提出的代码，所以您可以摘一片叶子:

            user.signUp(new CloudUserCallback() {

            @Override
            public void done(final CloudUser user1, CloudException e)
                    throws CloudException {
                if (e != null)
                    e.printStackTrace();
                else {
                    CloudRole role = new CloudRole(str);
                    role.save(new CloudRoleCallback() {

                        @Override
                        public void done(CloudRole x, CloudException t)
                                throws CloudException {
                            if (t != null)
                                t.printStackTrace();
                            else {
                                user1.addToRole(x, new CloudUserCallback() {

                                    @Override
                                    public void done(CloudUser user,
                                            CloudException e)
                                            throws CloudException {
                                        if (e != null)
                                            e.printStackTrace();
                                        else {
                                            System.out
                                                .println("user added to role");
                                        }

                                    }
                            });
                        }

                    }
                });
            }

        }
    });