如何将数据从各种片段传递到一个活动并存储在数据库中

我正在使用此库https://github.com/stepstone-tech/android-material-stepper创建分步注册系统

我有5个片段，每个片段都有一个EditText字段。我如何获取所有写入editText字段中的数据并存储在数据库中（我已经有了使用Volley Library通过JSON和PHP将数据存储到数据库中的方法。我可以通过一个活动和布局来完成此操作，但是我发现很难对片段应用相同的逻辑。）

用户名RegisterFragment

public class UsernameRegisterFragment extends Fragment implements Step {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_username_register, container, false);

    //initialize your UI

    return v;
}

@Override
public VerificationError verifyStep() {
    //return null if the user can go to the next step, create a new VerificationError instance otherwise
    return null;
}

@Override
public void onSelected() {
    //update UI when selected
}

@Override
public void onError(@NonNull VerificationError error) {
    //handle error inside of the fragment, e.g. show error on EditText
}
}

EmailRegisterFragment

public class FullnameRegisterFragment extends Fragment implements Step {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_fullname_register, container, false);

    //initialize your UI

    return v;
}

@Override
public VerificationError verifyStep() {
    //return null if the user can go to the next step, create a new VerificationError instance otherwise
    return null;
}

@Override
public void onSelected() {
    //update UI when selected
}

@Override
public void onError(@NonNull VerificationError error) {
    //handle error inside of the fragment, e.g. show error on EditText
}
}

还有大约4个片段，但它们都是相似的。

IntroActivity.java

这是设置适配器的主要活动，也是用户单击最后一个片段中的最后一个按钮（“完成”按钮）后将调用Register方法的活动。

public class IntroActivity extends AppCompatActivity implements StepperLayout.StepperListener{

private StepperLayout mStepperLayout;

private static String URL_REGISTER = "http://78d24f21.ngrok.io/misnap/register.php";
SessionManager sessionManager;

@Override
protected void onCreate(Bundle savedInstanceState) {


    //remove action and status bar

    if (getSupportActionBar() != null)
        getSupportActionBar().hide();

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_intro);


    mStepperLayout = (StepperLayout) findViewById(R.id.stepperLayout);
    mStepperLayout.setAdapter(new MyStepperAdapter(getSupportFragmentManager(), this));
    mStepperLayout.setListener(this);


}

@Override
public void onCompleted(View completeButton)
{
    Register();
}
.......
//This is where I placed the register method

注册方式

public void Register(){

   final String username = this.username.getText().toString().trim();
   final String email = this.email.getText().toString().trim();
   final String password = this.password.getText().toString().trim();

   StringRequest stringRequest = new StringRequest(Request.Method.POST, URL_REGISTER,
           new Response.Listener<String>() {
               @Override
               public void onResponse(String response) {
                   try {
                       JSONObject jsonObject = new JSONObject(response);
                       String success = jsonObject.getString("success");
                       if(success.equals("1")){
                           sessionManager.createSession(username, email);

                           Intent intent = new Intent(IntroActivity.this, HomeActivity.class);
                           intent.putExtra("username", username);
                           intent.putExtra("email", email);
                           startActivity(intent);
                       }

                   } catch (JSONException e){
                       e.printStackTrace();
                       Toast.makeText(IntroActivity.this, "Unable to register" + e.toString(), Toast.LENGTH_SHORT).show();
                   }
               }
           },
           new Response.ErrorListener() {
               @Override
               public void onErrorResponse(VolleyError error) {
                   Toast.makeText(IntroActivity.this, "Unable to register" + error.toString(), Toast.LENGTH_SHORT).show();
               }
           })
   {
       @Override
       protected Map<String, String> getParams() throws AuthFailureError {
           Map<String, String> params = new HashMap<>();
           params.put("username", username);
           params.put("email", email);
           params.put("password", password);
           return params;
       }
   };

   RequestQueue requestQueue = Volley.newRequestQueue(this);
   requestQueue.add(stringRequest);
}

}

我如何从各个片段中获取ediText数据并将其传递给此寄存器方法，以便可以保存在数据库中？

片段活动的布局只是一个EditText，而简介活动的布局是“下一步”和“后退”按钮。这里是。

activity_intro.xml

<?xml version="1.0" encoding="utf-8"?>
<com.stepstone.stepper.StepperLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/stepperLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:ms_stepperType="progress_bar"
app:ms_nextButtonColor="@color/white"
app:ms_completeButtonColor="@color/white"
app:ms_backButtonColor="@color/white"
/>