我正在嘗試使用parse注冊用戶，但它不斷拋出JSONException，這可能是什么問題？

Question

saveUser.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        final ParseUser user = new ParseUser();
        try {
            user.setUsername("12345");
            user.setPassword("1234");
        } catch(Exception e){
            e.getMessage();
        }
        user.signUpInBackground(new SignUpCallback() {
            @Override
            public void done(ParseException e) {
                if (e == null) {
                    // Sign-up successful!
                    Toast.makeText(getApplicationContext(),"Done",Toast.LENGTH_LONG).show();
                } else {
                    // Failed
                    AlertDialog.Builder builder = new AlertDialog.Builder(SignupActivity.this);
                    builder.setMessage(e.getMessage())
                           .setTitle("Oops try again!!!")
                           .setPositiveButton(android.R.string.ok, null);
                    AlertDialog dialog = builder.create();
                    dialog.show();
                    // Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
                }
            }
        });
    }
});

錯誤的json響應：org.json.JSONException：類型java.lang.String的值無效，無法轉換為JSONObject

Answer 1

刪除final ParseUser前-因為最終的變量應該是一成不變的，應該是這樣的：

ParseUser user = new ParseUser();