added missing code and resolved an error

app/src/main/java/com/nivesh/production/bajajfd/ui/activity/BajajFdMainActivity.kt

@@ -3,7 +3,6 @@ package com.nivesh.production.bajajfd.ui.activity
 import android.graphics.drawable.Drawable
 import android.os.Bundle
 import android.util.Log
-import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.ViewModelProvider
 import androidx.viewpager.widget.ViewPager
@@ -26,7 +25,7 @@ import com.nivesh.production.bajajfd.util.Resource
 import com.nivesh.production.bajajfd.viewModel.*
 
 
-class BajajFdMainActivity : AppCompatActivity(), BajajFDInterface {
+class BajajFdMainActivity : BaseActivity(), BajajFDInterface {
     lateinit var binding: ActivityBajajFdBinding
     private lateinit var viewModel: BajajFDViewModel
 
@@ -385,13 +384,13 @@ class BajajFdMainActivity : AppCompatActivity(), BajajFDInterface {
     // step 2 response
     override fun stepTwoApi(data: CreateFDRequest) {
         Log.e("stepTwoApi", " response ---> $data")
-        if (stepCount == 4) {
+     //   if (stepCount == 4) {
             // go to step 3 image Upload
-            binding.viewPager.currentItem = 2
-        } else {
+      //      binding.viewPager.currentItem = 2
+     //   } else {
             // call create fd api bypass step 3
-            createFDApi(data, 2)
-        }
+            createFDApi(data, 2, "2")
+     //   }
     }
 
 
@@ -399,7 +398,7 @@ class BajajFdMainActivity : AppCompatActivity(), BajajFDInterface {
     override fun stepThreeApi(data: CreateFDRequest) {
         Log.e("stepThreeApi", " response ---> $data")
         // call create fd api
-        createFDApi(data, 3)
+        createFDApi(data, 3, "3")
     }
 
     // step 4 response
@@ -408,7 +407,7 @@ class BajajFdMainActivity : AppCompatActivity(), BajajFDInterface {
         binding.viewPager.currentItem = 4
     }
 
-    private fun createFDApi(data: CreateFDRequest, currentItem: Int) {
+    private fun createFDApi(data: CreateFDRequest, currentItem: Int, step: String) {
         if (Common.isNetworkAvailable(this@BajajFdMainActivity)) {
 
             viewModel.createFDApi(data, token)
@@ -425,10 +424,16 @@ class BajajFdMainActivity : AppCompatActivity(), BajajFDInterface {
                             when (code) {
                                 200 -> {
                                     binding.viewPager.currentItem = currentItem
-                                    StepFourBajajFDFragment.getInstance(this).displayReceivedData(createFDApplicationResponse)
+                                    if (step == "2"){
+                                        val stepThreeBajajFDFragment: StepThreeBajajFDFragment =
+                                            sectionsPagerAdapter.getRegisteredFragment(stepCount - 1) as StepThreeBajajFDFragment
+                                        stepThreeBajajFDFragment.displayReceivedData(createFDApplicationResponse)
+                                    }
+                                    else{
                                     val stepFourFDFragment: StepFourBajajFDFragment =
                                         sectionsPagerAdapter.getRegisteredFragment(stepCount - 1) as StepFourBajajFDFragment
                                     stepFourFDFragment.displayReceivedData(createFDApplicationResponse)
+                                        }
                                 }
                                 //  650 -> refreshToken()
                                 else -> {

app/src/main/java/com/nivesh/production/bajajfd/ui/activity/BaseActivity.kt

@@ -0,0 +1,13 @@
+package com.nivesh.production.bajajfd.ui.activity
+
+import android.app.Activity
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+open class BaseActivity : AppCompatActivity() {
+    private lateinit var mActivity: Activity
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        mActivity = this
+    }
+}

app/src/main/java/com/nivesh/production/bajajfd/ui/fragment/BaseFragment.kt

@@ -0,0 +1,21 @@
+package com.nivesh.production.bajajfd.ui.fragment
+
+import android.content.Context
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import com.nivesh.production.bajajfd.ui.activity.BaseActivity
+
+open class BaseFragment : Fragment() {
+    protected var mActivity: BaseActivity? = null
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        if (context is BaseActivity) {
+            mActivity = context
+        } else try {
+            throw ClassCastException("You need to extend BaseActivity to calling activity.")
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+
+}

app/src/main/java/com/nivesh/production/bajajfd/ui/fragment/StepFourBajajFDFragment.kt

@@ -1,7 +1,5 @@
 package com.nivesh.production.bajajfd.ui.fragment
 
-import android.app.Activity
-import android.content.Context
 import android.os.Bundle
 import android.util.Log
 import android.view.LayoutInflater
@@ -22,7 +20,7 @@ import com.nivesh.production.bajajfd.util.Constants
 import com.nivesh.production.bajajfd.util.Resource
 import com.nivesh.production.bajajfd.viewModel.StepFourBajajFDViewModel
 
-class StepFourBajajFDFragment : Fragment() {
+class StepFourBajajFDFragment : BaseFragment() {
 
     private lateinit var stepFourBajajFDViewModel: StepFourBajajFDViewModel
     private var _binding: FragmentBajajfdStepFourBinding? = null
@@ -67,6 +65,10 @@ class StepFourBajajFDFragment : Fragment() {
                 )
             }
         }
+
+        binding.btnBack.setOnClickListener{
+            (activity as BajajFdMainActivity).binding.viewPager.currentItem = 2
+        }
         return root
     }
 
@@ -130,10 +132,10 @@ class StepFourBajajFDFragment : Fragment() {
     }
 
     private fun getFDDetailsApi(uniqueId: String) {
-        if (Common.isNetworkAvailable(requireActivity())) {
+        if (Common.isNetworkAvailable(mActivity!!)) {
             val getFDDetailsRequest = GetFDDetailsRequest()
-            getFDDetailsRequest.FDProvider = requireActivity().getString(R.string.bajaj)
-            getFDDetailsRequest.NiveshClientCode = (requireContext().applicationContext as BajajFdMainActivity).getClientDetailsResponse.ObjectResponse?.clientDetails?.clientMasterMFD?.CLIENT_CODE
+            getFDDetailsRequest.FDProvider = mActivity!!.getString(R.string.bajaj)
+            getFDDetailsRequest.NiveshClientCode = (mActivity as BajajFdMainActivity).getClientDetailsResponse.ObjectResponse?.clientDetails?.clientMasterMFD?.CLIENT_CODE
             getFDDetailsRequest.UniqueId = uniqueId
             stepFourBajajFDViewModel.getFDDetails(getFDDetailsRequest, Constants.token)
             stepFourBajajFDViewModel.getFDDetailsMutableData.observe(viewLifecycleOwner) { response ->

app/src/main/java/com/nivesh/production/bajajfd/ui/fragment/StepOneBajajFDFragment.kt

@@ -31,7 +31,7 @@ import com.nivesh.production.bajajfd.util.Resource
 import com.nivesh.production.bajajfd.viewModel.StepOneBajajFDViewModel
 
 
-class StepOneBajajFDFragment : Fragment() {
+class StepOneBajajFDFragment : BaseFragment() {
     private var _binding: FragmentBajajfdStepOneBinding? = null
     private val binding get() = _binding!!
 

app/src/main/java/com/nivesh/production/bajajfd/ui/fragment/StepThreeBajajFDFragment.kt

@@ -36,7 +36,7 @@ import com.nivesh.production.bajajfd.util.Resource
 import com.nivesh.production.bajajfd.viewModel.StepThreeBajajFDViewModel
 import java.io.File
 
-class StepThreeBajajFDFragment : Fragment() {
+class StepThreeBajajFDFragment : BaseFragment() {
 
     private var latestTmpUri: Uri? = null
     private var _binding: FragmentBajajfdStepThreeBinding? = null
@@ -45,7 +45,7 @@ class StepThreeBajajFDFragment : Fragment() {
 
     private lateinit var bajajFDInterface: BajajFDInterface
     private lateinit var stepThreeBajajFDViewModel: StepThreeBajajFDViewModel
-
+    private var uniqueId: String? = ""
     private lateinit var dialog: Dialog
 
     companion object {
@@ -313,4 +313,8 @@ class StepThreeBajajFDFragment : Fragment() {
         super.onDestroyView()
         _binding = null
     }
+
+    fun displayReceivedData(createFDApplicationResponse: CreateFDApplicationResponse) {
+       uniqueId = createFDApplicationResponse.Response.FDCreationDetailsResponse.UniqueId
+    }
 }

app/src/main/java/com/nivesh/production/bajajfd/ui/fragment/StepTwoBajajFDFragment.kt

@@ -46,7 +46,7 @@ import com.nivesh.production.bajajfd.viewModel.StepTwoBajajFDViewModel
 import java.util.*
 
 
-class StepTwoBajajFDFragment : Fragment() {
+class StepTwoBajajFDFragment : BaseFragment() {
 
     private var _binding: FragmentBajajfdStepTwoBinding? = null
     private val binding get() = _binding!!

app/src/main/java/com/nivesh/production/bajajfd/util/Common.kt

@@ -15,6 +15,7 @@ import com.google.android.material.textfield.TextInputEditText
 import com.google.android.material.textfield.TextInputLayout
 import com.google.gson.JsonObject
 import com.nivesh.production.bajajfd.R
+import com.nivesh.production.bajajfd.ui.activity.BaseActivity
 import retrofit2.HttpException
 import java.io.IOException
 import java.text.SimpleDateFormat
@@ -33,7 +34,7 @@ class Common {
         val connectivityManager = getApplication<NewsApplication>().getSystemService(....
          **/
         //internet check
-        fun isNetworkAvailable(activity: Activity): Boolean {
+        fun isNetworkAvailable(activity: BaseActivity): Boolean {
             val connectivityManager = activity.getSystemService(
                 Context.CONNECTIVITY_SERVICE
             ) as ConnectivityManager

app/src/main/java/com/nivesh/production/bajajfd/viewModel/StepThreeBajajFDViewModel.kt

@@ -27,4 +27,5 @@ class StepThreeBajajFDViewModel(private val mainRepository: MainRepository) : Vi
         getTitleMutableData.postValue(handleRatesResponse(response))
     }
 
+
 }