Question

我正在创建一个应用程序，我将数据从一个片段发送到对话框片段通过Bundle并使用哈希映射传递该字符串并将该数据保存到数据库。当我从片段发送数据到对话框片段时，它没有到达那里我得到以下错误，我的应用程序崩溃：

Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference

片段代码：

private void mobileNumber()
{

    Bundle args = new Bundle();
    args.putString("mobile", edtMobileNumber.getText().toString());
    DialogFragment newFragment = new Save_contact_fragment();
    newFragment.setArguments(args);
 //   newFragment.show(getFragmentManager(),"TAG");

}

在此代码中，我将向对话框片段发送手机号码。对话框片段代码：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    TokenModel mTokenModel = ((BaseActivity)getActivity()).getTokenDetails();
    if (mTokenModel != null) {
        mAuthorizationHeader = mTokenModel.getTokenType() + " " + mTokenModel.getAccessToken();
    }


    Bundle args = this.getArguments();
    data = args.getString("mobile");

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.activity_save_contact, container, false);
    initUI(view);
    return view;
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);

    /*Bundle bundle = this.getArguments();
    if (bundle == null) {
        data = bundle.getString("mobile");
    }*/

}

@Override
public void onDetach() {
    super.onDetach();
}

private void initUI(View view) {

    btnsave = (Button) view.findViewById(R.id.save);
    btnCancelDialog = (Button) view.findViewById(R.id.btn_cancel);


    etPromoCode = (EditText) view.findViewById(R.id.et_promo_code);
    etPromoCode.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            if (charSequence.toString().length() > 0) {
                btnsave.setEnabled(true);
            } else {
                btnsave.setEnabled(false);
            }
        }

        @Override
        public void afterTextChanged(Editable editable) {
        }
    });

    // Should always be at the end
    bindClicks();
}

private void bindClicks() {
    btnsave.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            callAddToContactAPI();

            //Toast.makeText(getContext(), "save", Toast.LENGTH_SHORT).show();
            //dismiss();
        }
    });

    btnCancelDialog.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            dismiss();
        }
    });
}

private void callAddToContactAPI() {

    if (selectedPlan == null) {
        selectedPlan = new SaveContactModel();
        //selectedPlan.setRemark(Constants.CATEGORY_MOBILE_RECHARGE);

        //Toast.makeText(getContext(), "1", Toast.LENGTH_SHORT).show();
    }
    //selectedPlan.setPlanMrp(Integer.parseInt(Utils.getTextFromEditText(etPromoCode)));
    addToContactAPI(selectedPlan);
}

private void addToContactAPI(SaveContactModel saveContactModel) {

    if (!Utils.isNetworkConnected(getActivity())) {
        return;
    }
    CartClient cartClient = ServiceGenerator.createService(CartClient.class);

    HashMap<String, Object> parameterMap = new HashMap<>();

    parameterMap.put(Constants.ADD_ContactName,Utils.getTextFromEditText(etPromoCode));
    parameterMap.put(Constants.ADD_ContactNumber,data);
    parameterMap.put(Constants.ADD_ServiceID_TO_SAVE, 1);
    parameterMap.put(Constants.ADD_UserBasicID,"1593");


    Call<String> cart = cartClient.addToContact(mAuthorizationHeader, parameterMap);

    //Toast.makeText(getContext(), "2", Toast.LENGTH_SHORT).show();

    String abc = cart.request().url().toString();

    cart.enqueue(new Callback<String>() {
        @Override
        public void onResponse(Call<String> call, Response<String> response) {

            if(response.code() == 200) {

                Intent intent = new Intent(getContext(), MyContactActivity.class);

                startActivity(intent);

                Utils.showAlertDialogWithMessage(Constants.CONTACT_ADDED, getActivity());

                //  Utils.showAlertDialogWithMessage(Constants.SUCCESS_MESSAGE_ITEM_ADDED_TO_CART, getActivity());
            } else {
             //   Utils.showAlertDialogWithMessage(Constants.ERROR_UNABLE_TO_PROCESS_REQUEST, getActivity());
            }
        }

        @Override
        public void onFailure(Call<String> call, Throwable t) {

            Utils.showShortToastMessage(getActivity(), Constants.ERROR_OOPS_SOMETHING_WENT_WRONG);
        }
    });


}

这是我在对话框片段中接收数据的地方：

Bundle args = this.getArguments();
data = args.getString("mobile");

但是当我将该数据字符串传递给哈希映射时，我得到null并得到错误。我在以下代码中这样做：

HashMap<String, Object> parameterMap = new HashMap<>();

parameterMap.put(Constants.ADD_ContactName,Utils.getTextFromEditText(etPromoCode));
parameterMap.put(Constants.ADD_ContactNumber,data);
parameterMap.put(Constants.ADD_ServiceID_TO_SAVE, 1);
parameterMap.put(Constants.ADD_UserBasicID,"1593");

手机号码不在手机中。

Answer 1

把这部分：

Bundle args = getArguments();
data = args.getString("mobile");

在onCreateView而不是onCreate而没有this.

Answer 2

您可以使用onViewCreated或onCreateView方法获取传递的参数。如果您没有收到包，则如果参数不同于null，则将使用默认字符串。

String mobile = getArguments() != null ?  getArguments().getString("mobile", "defaultString") : "defaultString";

数据不会在片段到dailog片段之间传递

2 个答案: