keep transfer form in cache (no reset on page change

app/build.gradle.kts

@@ -11,8 +11,8 @@ android {
         applicationId = "sh.sar.basedbank"
         minSdk = 26
         targetSdk = 36
-        versionCode = 12
-        versionName = "1.0.13"
+        versionCode = 13
+        versionName = "1.0.14"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }

app/src/main/java/sh/sar/basedbank/ui/home/HomeActivity.kt

@@ -76,6 +76,7 @@ class HomeActivity : AppCompatActivity() {
     private val viewModel: HomeViewModel by viewModels()
     private lateinit var toggle: ActionBarDrawerToggle
     private var suppressBottomNavCallback = false
+    private var cachedTransferFragment: TransferFragment? = null
 
     private var backPressedOnce = false
     private val backPressHandler = Handler(Looper.getMainLooper())
@@ -156,7 +157,7 @@ class HomeActivity : AppCompatActivity() {
                 R.id.nav_dashboard        -> DashboardFragment()
                 R.id.nav_accounts         -> AccountsFragment()
                 R.id.nav_contacts         -> ContactsFragment()
-                R.id.nav_transfer         -> TransferFragment()
+                R.id.nav_transfer         -> cachedTransferFragment ?: TransferFragment().also { cachedTransferFragment = it }
                 R.id.nav_pay_mv_qr        -> PayMvQrFragment()
                 R.id.nav_more             -> MoreFragment()
                 R.id.nav_activities       -> ActivitiesFragment()
@@ -390,7 +391,7 @@ fun applyNavLabelVisibility() {
             R.id.nav_dashboard        -> DashboardFragment()
             R.id.nav_accounts         -> AccountsFragment()
             R.id.nav_contacts         -> ContactsFragment()
-            R.id.nav_transfer         -> TransferFragment()
+            R.id.nav_transfer         -> cachedTransferFragment ?: TransferFragment().also { cachedTransferFragment = it }
             R.id.nav_pay_mv_qr        -> PayMvQrFragment()
             R.id.nav_activities       -> ActivitiesFragment()
             R.id.nav_transfer_history -> TransferHistoryFragment()

app/src/main/java/sh/sar/basedbank/ui/home/TransferFragment.kt

@@ -92,6 +92,14 @@ class TransferFragment : Fragment() {
     // Values: "FAHIPAY_TRANSFER", "RAASTAS", "OOREDOO_BILL"
     private var selectedFahipayService: String? = null
 
+    // Form state preserved across view destroy/create when the fragment instance is cached
+    private var savedAmount = ""
+    private var savedRemarks = ""
+    private var savedToText = ""
+    private var savedToSubtitle = ""
+    private var savedToColorHex = "#607D8B"
+    private var savedToImageHash: String? = null
+
     // BML QR merchant payment mode (set when navigated from a card QR scan)
     private var bmlQrInfo: BmlQrPayInfo? = null
     private var bmlGatewayQr = false  // true for pay.bml.com.mv QRs (requires pre-initiate step)
@@ -255,6 +263,18 @@ class TransferFragment : Fragment() {
             val colorHex  = bundle.getString(ContactPickerSheetFragment.KEY_COLOR) ?: "#607D8B"
             val imageHash = bundle.getString(ContactPickerSheetFragment.KEY_IMAGE_HASH)
             prefillToDirectly(accountNumber, label, subtitle, colorHex, imageHash)
+            if (selectedAccount == null) {
+                val defaultNum = CredentialStore(requireContext()).getDefaultAccountNumber()
+                if (defaultNum != null) {
+                    val defaultAcc = viewModel.accounts.value?.firstOrNull { it.accountNumber == defaultNum }
+                    if (defaultAcc != null) {
+                        selectedAccount = defaultAcc
+                        updateAmountPrefix(defaultAcc)
+                        showFromCard(defaultAcc)
+                        updateTransferButton()
+                    }
+                }
+            }
         }
 
         binding.btnPickContact.setOnClickListener {
@@ -294,6 +314,33 @@ class TransferFragment : Fragment() {
         if (arguments?.getBoolean(ARG_AUTO_SCAN, false) == true) {
             qrLauncher.launch(Intent(requireContext(), QrScannerActivity::class.java))
         }
+
+        // Restore form state when view is recreated on the cached no-args instance
+        if (arguments == null) {
+            if (resolvedAccountNumber.isNotEmpty()) {
+                val ownAccount = viewModel.accounts.value?.firstOrNull { it.accountNumber == resolvedAccountNumber }
+                if (ownAccount != null) {
+                    showToCard(ownAccount)
+                } else {
+                    binding.tvToAccountName.text = resolvedRecipientName
+                    binding.tvToBankBic.text = savedToSubtitle
+                    binding.tvToAccountDetails.visibility = View.GONE
+                    binding.tvToBalance.visibility = View.GONE
+                    binding.ivToPhoto.scaleType = android.widget.ImageView.ScaleType.CENTER_CROP
+                    binding.ivToPhoto.setImageBitmap(makeInitialsBitmap(resolvedRecipientName, savedToColorHex))
+                }
+                binding.tilTo.visibility = View.GONE
+                binding.btnPickContact.visibility = View.GONE
+                binding.btnScanQr.visibility = View.GONE
+                binding.cardToInfo.visibility = View.VISIBLE
+                if (savedToImageHash != null) loadToPhoto(savedToImageHash!!, isProfile = resolvedToOwnAccount != null)
+            } else if (savedToText.isNotEmpty()) {
+                binding.etTo.setText(savedToText)
+            }
+            if (savedAmount.isNotEmpty()) binding.etAmount.setText(savedAmount)
+            if (savedRemarks.isNotEmpty()) binding.etRemarks.setText(savedRemarks)
+            updateTransferButton()
+        }
     }
 
     private fun lookupBmlQrMerchant(qrUrl: String) {
@@ -439,6 +486,20 @@ class TransferFragment : Fragment() {
                 }
             }
 
+            // Auto-select default account when arriving from contacts page (TO account already pre-filled)
+            if (selectedAccount == null && arguments?.getString(ARG_ACCOUNT) != null) {
+                val defaultNum = CredentialStore(requireContext()).getDefaultAccountNumber()
+                if (defaultNum != null) {
+                    val defaultAcc = accounts.firstOrNull { it.accountNumber == defaultNum }
+                    if (defaultAcc != null) {
+                        selectedAccount = defaultAcc
+                        updateAmountPrefix(defaultAcc)
+                        showFromCard(defaultAcc)
+                        updateTransferButton()
+                    }
+                }
+            }
+
             // On a cold start (e.g. share intent), anyBmlSession() may be null when
             // onViewCreated runs. Retry the lookup once sessions are available.
             val pendingBmlQrUrl = arguments?.getString(ARG_BML_QR_URL)
@@ -446,6 +507,13 @@ class TransferFragment : Fragment() {
                 val app = requireActivity().application as BasedBankApp
                 if (app.anyBmlSession() != null) lookupBmlQrMerchant(pendingBmlQrUrl)
             }
+
+            // Re-render the from card when the view is recreated on a cached instance
+            if (selectedAccount != null && binding.cardFromInfo.visibility != View.VISIBLE) {
+                updateAmountPrefix(selectedAccount!!)
+                showFromCard(selectedAccount!!)
+                updateTransferButton()
+            }
         }
     }
 
@@ -731,6 +799,13 @@ class TransferFragment : Fragment() {
                 resolvedAccountNumber = info.accountNumber
                 resolvedRecipientName = info.accountName
                 resolvedBankName = info.bankId
+                savedToSubtitle = "${info.accountNumber} · ${info.bankId}"
+                savedToColorHex = colorHex
+                savedToImageHash = when {
+                    matchedAcc?.profileImageHash != null -> matchedAcc.profileImageHash
+                    matchedCont?.customerImgHash != null -> matchedCont.customerImgHash
+                    else -> null
+                }
 
                 if (matchedAcc != null) {
                     showToCard(matchedAcc)
@@ -863,6 +938,9 @@ class TransferFragment : Fragment() {
     ) {
         resolvedAccountNumber = accountNumber
         resolvedRecipientName = displayName
+        savedToSubtitle = subtitle
+        savedToColorHex = colorHex
+        savedToImageHash = imageHash
         val contacts = viewModel.contacts.value ?: emptyList()
         resolvedBankName = contacts.firstOrNull { it.benefAccount == accountNumber }?.benefBankName ?: ""
 
@@ -2053,6 +2131,14 @@ class TransferFragment : Fragment() {
 
     override fun onDestroyView() {
         super.onDestroyView()
+        // Persist form state so it can be restored when the view is recreated
+        savedAmount = binding.etAmount.text?.toString() ?: ""
+        savedRemarks = binding.etRemarks.text?.toString() ?: ""
+        savedToText = if (resolvedAccountNumber.isEmpty()) binding.etTo.text?.toString() ?: "" else ""
+        // Reset in-progress OTP flow — it cannot sensibly resume after the view is gone
+        bmlOtpState = BmlOtpState.NONE
+        pendingBmlTransfer = null
+        bmlOtpChannel = null
         _binding = null
     }