如何从Fragment中的EditText中获取文本（）并传入Volley参数？

Question

我第一次在片段中使用Volley。

任何人都可以帮助我。我正在尝试以下代码，用于从导航抽屉调用的片段：

public class ChangePassword extends android.app.Fragment implements View.OnClickListener
{
    EditText etOldSignUpPassword;
    EditText etNewSignUpPassword;
    EditText etNewSignUpConfirmPassword;
    ImageButton imageChangePasswordButton;
    ProgressBar pbWeb;
    String old,npass,ncpass;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View v =  inflater.inflate(R.layout.fragment_change_password, container, false);
    etOldSignUpPassword = (EditText)v.findViewById(R.id.etOldPassword);
    etNewSignUpPassword = (EditText)v.findViewById(R.id.etNewSignUpPassword);
    etNewSignUpConfirmPassword = (EditText)v.findViewById(R.id.etNewSignUpConfirmPassword);
    imageChangePasswordButton = (ImageButton)v.findViewById(R.id.imageChangePasswordButton);
    pbWeb = (ProgressBar)v.findViewById(R.id.pbWebC);
    pbWeb.setVisibility(View.GONE);


    imageChangePasswordButton.setOnClickListener(this);

    return v;
    }

@Override
public void onClick(View view) {
    if(view.getId() == R.id.imageChangePasswordButton) {

        old = etOldSignUpPassword.getText().toString();
        npass = etNewSignUpPassword.getText().toString();
        ncpass = etNewSignUpConfirmPassword.getText().toString();

        if (!isNetworkAvailable()) {
            Toast.makeText(getActivity(), "Your Wifi/Data is disabled. Please switch on and try again", Toast.LENGTH_SHORT).show();
        } else {
            pbWeb.setVisibility(View.VISIBLE);
            String server_url = "url_working_fine_for_activity_so_no_issue_here";
            StringRequest strReq = new StringRequest(Request.Method.POST, server_url, new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    if (response.equals("SUCCESS")) {
                        Toast.makeText(getActivity(), "Password Changed Successfully", Toast.LENGTH_SHORT).show();
                        Intent loginIntent = new Intent(getActivity(), LoginActivity.class);
                        startActivity(loginIntent);
                        pbWeb.setVisibility(View.GONE);
                        getActivity().finish();
                    } else {
                        pbWeb.setVisibility(View.GONE);
                        Toast.makeText(getActivity(), "Couldn't Change Password. Old Password Exists", Toast.LENGTH_SHORT).show();
                    }

                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    pbWeb.setVisibility(View.GONE);
                    Toast.makeText(getActivity(), error.toString(), Toast.LENGTH_SHORT).show();
                }
            }) {
                @Override
                protected Map<String, String> getParams() throws AuthFailureError {
                    Map<String, String> map = new HashMap<String, String>();
                    map.put("old", old);//etOldPassword.getText().toString() throws NullPointerException
                    map.put("new", npass);//"MY_DEFAULT_VALUE" as value is working fine but that is not the use case
                    map.put("newCon", ncpass);
                    return map;
                }
            };
            //VolleySingleton is fine as working in Activity as well as when I give default values in getParams so no issue in this class 
            VolleySingleton.getInstance(getActivity().getApplicationContext()).addToReqQueue(strReq);
        }
    }
}

PREV： 目前此代码导致崩溃。

注意：我已尝试在onActivityCreated（）方法内的imageChangePasswordButton上直接使用onClickListener（），而不在类上实现onClickListener，但在线程上发现存在错误。

编辑： 目前的代码工作正常。

这是请求的xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".mypackage.ChangePassword">  <!--The class ChangePassword is inside mypackage--> 

<ProgressBar
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/pbWebC"
    style="@android:style/Widget.ProgressBar.Small"
    android:layout_centerInParent="true" />

<LinearLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_alignParentTop="true">


    <ImageView
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:src="@drawable/image1"
        android:id="@+id/logo"
        android:layout_gravity="center_horizontal" />


    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:hint="@string/prompt_old_email"
        android:ems="10"
        android:layout_marginTop="10dp"
        android:id="@+id/etOldPassword" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:hint="@string/prompt_new_password"
        android:ems="10"
        android:layout_marginTop="10dp"
        android:id="@+id/etNewSignUpPassword" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:hint="@string/prompt_new_confirm_password"
        android:ems="10"
        android:layout_marginTop="10dp"
        android:id="@+id/etNewSignUpConfirmPassword" />

    <ImageButton
        android:layout_width="150dp"
        android:layout_height="50dp"
        android:layout_gravity="center"
        android:id="@+id/imageChangePasswordButton"
        android:layout_marginTop="20dp"
        android:src="@drawable/reset" />


</LinearLayout>
</RelativeLayout>

编辑： 代码正常运行。谢谢您的帮助。 @LongRanger @ i-Droid