rework back butotn

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

@@ -14,8 +14,10 @@ import android.widget.Toast
 import sh.sar.basedbank.ui.home.NavCustomization
 import androidx.appcompat.app.AlertDialog
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import androidx.activity.OnBackPressedCallback
 import androidx.activity.viewModels
 import androidx.appcompat.app.ActionBarDrawerToggle
+import androidx.core.view.GravityCompat
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowCompat
@@ -72,6 +74,10 @@ class HomeActivity : AppCompatActivity() {
     private lateinit var toggle: ActionBarDrawerToggle
     private var suppressBottomNavCallback = false
 
+    private var backPressedOnce = false
+    private val backPressHandler = Handler(Looper.getMainLooper())
+    private val resetBackPress = Runnable { backPressedOnce = false }
+
     private val autolockHandler = Handler(Looper.getMainLooper())
     private var warningDialog: AlertDialog? = null
     private var countdownTimer: CountDownTimer? = null
@@ -211,6 +217,42 @@ class HomeActivity : AppCompatActivity() {
             binding.navigationView.setCheckedItem(R.id.nav_dashboard)
         }
 
+        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                // Close drawer if open (drawer-nav mode)
+                if (binding.drawerLayout.isDrawerOpen(GravityCompat.START)) {
+                    binding.drawerLayout.closeDrawers()
+                    return
+                }
+                // Pop fragment back stack if there's anything on it (e.g. showWithBackStack)
+                if (supportFragmentManager.backStackEntryCount > 0) {
+                    supportFragmentManager.popBackStack()
+                    return
+                }
+                // In bottom nav mode, pressing back navigates up the hierarchy
+                val isBottomNav = getSharedPreferences("prefs", MODE_PRIVATE).getBoolean("bottom_nav", false)
+                if (isBottomNav && binding.bottomNavigation.selectedItemId != R.id.nav_dashboard) {
+                    val currentFrag = supportFragmentManager.findFragmentById(R.id.contentFrame)
+                    // Sub-page reached via More (e.g. Settings, Activities) — go back to More
+                    if (binding.bottomNavigation.selectedItemId == R.id.nav_more && currentFrag !is MoreFragment) {
+                        show(MoreFragment())
+                        return
+                    }
+                    binding.bottomNavigation.selectedItemId = R.id.nav_dashboard
+                    return
+                }
+                // At top level — require double-tap to exit
+                if (backPressedOnce) {
+                    backPressHandler.removeCallbacks(resetBackPress)
+                    finish()
+                } else {
+                    backPressedOnce = true
+                    Toast.makeText(this@HomeActivity, R.string.press_back_to_exit, Toast.LENGTH_SHORT).show()
+                    backPressHandler.postDelayed(resetBackPress, 2000)
+                }
+            }
+        })
+
         // Keep all MIB sessions alive every 25 seconds while the app is in the foreground
         lifecycleScope.launch {
             repeatOnLifecycle(Lifecycle.State.STARTED) {

app/src/main/res/values/strings.xml

@@ -89,6 +89,7 @@
     <string name="nav_open_drawer">Open navigation</string>
     <string name="nav_close_drawer">Close navigation</string>
     <string name="work_in_progress">Work in progress</string>
+    <string name="press_back_to_exit">Press back again to exit</string>
 
     <!-- Dashboard -->
     <string name="dashboard_pending_finances">Pending Finances</string>