- Fragment navigation library added

- on back pressed fixed

.gitignore

@@ -89,6 +89,7 @@ gen-external-apklibs
 .idea/assetWizardSettings.xml
 .idea/gradle.xml
 .idea/jarRepositories.xml
+.idea/navEditor.xml
 
 # Gem/fastlane
 Gemfile.lock

app/src/main/java/com/appttude/h_mal/farmr/ui/FragmentAddItem.kt

@@ -1,6 +1,7 @@
 package com.appttude.h_mal.farmr.ui
 
 import android.os.Bundle
+import android.util.Log
 import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
@@ -10,21 +11,19 @@ import android.widget.RadioButton
 import android.widget.RadioGroup
 import android.widget.ScrollView
 import android.widget.TextView
+import androidx.activity.OnBackPressedCallback
 import androidx.core.widget.doAfterTextChanged
 import com.appttude.h_mal.farmr.R
-import com.appttude.h_mal.farmr.base.BackPressedListener
 import com.appttude.h_mal.farmr.base.FormFragment
 import com.appttude.h_mal.farmr.model.ShiftType
 import com.appttude.h_mal.farmr.model.Success
 import com.appttude.h_mal.farmr.utils.ID
-import com.appttude.h_mal.farmr.utils.SHIFT_ID
 import com.appttude.h_mal.farmr.utils.createDialog
 import com.appttude.h_mal.farmr.utils.displayToast
 import com.appttude.h_mal.farmr.utils.formatAsCurrencyString
 import com.appttude.h_mal.farmr.utils.formatToTwoDpString
 import com.appttude.h_mal.farmr.utils.goBack
 import com.appttude.h_mal.farmr.utils.hide
-import com.appttude.h_mal.farmr.utils.popBackStack
 import com.appttude.h_mal.farmr.utils.setDatePicker
 import com.appttude.h_mal.farmr.utils.setTimePicker
 import com.appttude.h_mal.farmr.utils.show
@@ -32,7 +31,9 @@ import com.appttude.h_mal.farmr.utils.validateField
 import com.appttude.h_mal.farmr.viewmodel.SubmissionViewModel
 
 class FragmentAddItem : FormFragment<SubmissionViewModel>(R.layout.fragment_add_item),
-    RadioGroup.OnCheckedChangeListener, BackPressedListener {
+    RadioGroup.OnCheckedChangeListener {
+
+    private lateinit var onBackPressed: OnBackPressedCallback
 
     private lateinit var mHourlyRadioButton: RadioButton
     private lateinit var mPieceRadioButton: RadioButton
@@ -123,6 +124,13 @@ class FragmentAddItem : FormFragment<SubmissionViewModel>(R.layout.fragment_add_
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setHasOptionsMenu(false)
+        // This callback is only called when MyFragment is at least started
+        onBackPressed = object : OnBackPressedCallback(false) {
+            override fun handleOnBackPressed() {
+                onBackPressed()
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, onBackPressed)
     }
 
     override fun onResume() {
@@ -132,17 +140,27 @@ class FragmentAddItem : FormFragment<SubmissionViewModel>(R.layout.fragment_add_
             else -> getString(R.string.add_item_title)
         }
         setTitle(title)
+
+        onBackPressed.isEnabled = true
+    }
+
+    override fun onPause() {
+        super.onPause()
+        onBackPressed.isEnabled = false
     }
 
     private fun setupViewAfterViewCreated() {
-        val id = arguments?.takeIf { it.containsKey(SHIFT_ID) }
-            ?.let { FragmentAddItemArgs.fromBundle(it).shiftId }
+        val id = try {
+            FragmentAddItemArgs.fromBundle(requireArguments()).shiftId
+        } catch (e: Exception) {
+            Log.i("Nav Args", "Failed to retrieve args from navigation")
+            null
+        }
 
         wholeView.hide()
 
-        if (id != null) {
         // Since we are editing a shift lets load the shift data into the views
-            viewModel.getCurrentShift(arguments!!.getLong(ID))?.run {
+        id?.let { viewModel.getCurrentShift(id) }?.run {
             mLocationEditText.setText(description)
             mDateEditText.setText(date)
 
@@ -182,7 +200,6 @@ class FragmentAddItem : FormFragment<SubmissionViewModel>(R.layout.fragment_add_
 
             calculateTotalPay()
         }
-        }
 
         applyFormListener(view = view as ViewGroup)
     }
@@ -286,7 +303,7 @@ class FragmentAddItem : FormFragment<SubmissionViewModel>(R.layout.fragment_add_
         }
     }
 
-    override fun onBackPressed(): Boolean {
+    fun onBackPressed() {
         if (didFormChange()) {
             requireContext().createDialog(
                 title = "Discard Changes?",
@@ -299,7 +316,6 @@ class FragmentAddItem : FormFragment<SubmissionViewModel>(R.layout.fragment_add_
         } else {
             goBack()
         }
-        return true
     }
 
     override fun onSuccess(data: Any?) {

app/src/main/java/com/appttude/h_mal/farmr/ui/FragmentMain.kt

@@ -7,11 +7,10 @@ import android.view.Menu
 import android.view.MenuInflater
 import android.view.MenuItem
 import android.view.View
+import androidx.activity.OnBackPressedCallback
 import androidx.core.content.FileProvider
 import androidx.recyclerview.widget.RecyclerView
-import androidx.recyclerview.widget.RecyclerView.AdapterDataObserver
 import com.appttude.h_mal.farmr.R
-import com.appttude.h_mal.farmr.base.BackPressedListener
 import com.appttude.h_mal.farmr.base.BaseFragment
 import com.appttude.h_mal.farmr.data.legacydb.ShiftObject
 import com.appttude.h_mal.farmr.model.Order
@@ -19,30 +18,43 @@ import com.appttude.h_mal.farmr.model.Sortable
 import com.appttude.h_mal.farmr.model.Success
 import com.appttude.h_mal.farmr.utils.createDialog
 import com.appttude.h_mal.farmr.utils.displayToast
-import com.appttude.h_mal.farmr.utils.hide
 import com.appttude.h_mal.farmr.utils.navigateTo
-import com.appttude.h_mal.farmr.utils.navigateToFragment
-import com.appttude.h_mal.farmr.utils.show
 import com.appttude.h_mal.farmr.viewmodel.MainViewModel
 import com.google.android.material.floatingactionbutton.FloatingActionButton
 import java.io.File
 import kotlin.system.exitProcess
 
 
-class FragmentMain : BaseFragment<MainViewModel>(R.layout.fragment_main), BackPressedListener {
+class FragmentMain : BaseFragment<MainViewModel>(R.layout.fragment_main) {
     private lateinit var productListView: RecyclerView
     private lateinit var emptyView: View
     private lateinit var mAdapter: ShiftListAdapter
 
+    private lateinit var onBackPressed: OnBackPressedCallback
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         // Inflate the layout for this fragment
         setHasOptionsMenu(true)
+        // This callback is only called when MyFragment is at least started
+        onBackPressed = object : OnBackPressedCallback(false) {
+            override fun handleOnBackPressed() {
+                onBackPressed()
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, onBackPressed)
     }
 
     override fun onResume() {
         super.onResume()
         setTitle("Shift List")
+
+        onBackPressed.isEnabled = true
+    }
+
+    override fun onPause() {
+        super.onPause()
+        onBackPressed.isEnabled = false
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
@@ -182,21 +194,13 @@ class FragmentMain : BaseFragment<MainViewModel>(R.layout.fragment_main), BackPr
                 file
             )
             intent.setDataAndType(excelUri, "application/vnd.ms-excel")
-            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
             startActivity(intent)
         }
 
     }
 
-    private fun exportDialog() {
-        AlertDialog.Builder(context)
-            .setTitle("Export?")
-            .setMessage("Exporting current filtered data. Continue?")
-            .setNegativeButton(android.R.string.cancel, null)
-            .setPositiveButton(android.R.string.ok) { _, _ -> exportData() }.create().show()
-    }
-
-    override fun onBackPressed(): Boolean {
+    fun onBackPressed() {
         requireContext().createDialog(
             title = "Leave?",
             message = "Are you sure you want to exit Farmr?",
@@ -210,6 +214,5 @@ class FragmentMain : BaseFragment<MainViewModel>(R.layout.fragment_main), BackPr
                 exitProcess(0)
             }
         )
-        return true
     }
 }

app/src/main/java/com/appttude/h_mal/farmr/ui/MainActivity.kt

@@ -1,16 +1,11 @@
 package com.appttude.h_mal.farmr.ui
 
 import android.os.Bundle
-import android.view.Menu
 import android.view.MenuItem
 import androidx.appcompat.widget.Toolbar
-import androidx.core.app.ActivityCompat
 import androidx.navigation.fragment.NavHostFragment
 import com.appttude.h_mal.farmr.R
-import com.appttude.h_mal.farmr.base.BackPressedListener
 import com.appttude.h_mal.farmr.base.BaseActivity
-import com.appttude.h_mal.farmr.utils.goBack
-import com.appttude.h_mal.farmr.utils.popBackStack
 
 class MainActivity : BaseActivity() {
     private lateinit var toolbar: Toolbar
@@ -28,33 +23,6 @@ class MainActivity : BaseActivity() {
         navController.setGraph(R.navigation.shift_navigation)
     }
 
-    override fun onSupportNavigateUp(): Boolean {
-        val currentFragment = navHost.parentFragment
-        return if (currentFragment is BackPressedListener) {
-            currentFragment.onBackPressed()
-        } else {
-            if (supportFragmentManager.backStackEntryCount > 1) {
-                navHost.goBack()
-            } else {
-                super.onSupportNavigateUp()
-            }
-        }
-    }
-
-
-    override fun onBackPressed() {
-        val currentFragment = supportFragmentManager.findFragmentById(R.id.container)
-        if (currentFragment is BackPressedListener) {
-            currentFragment.onBackPressed()
-        } else {
-            if (supportFragmentManager.backStackEntryCount > 1) {
-                navHost.goBack()
-            } else {
-                super.onBackPressed()
-            }
-        }
-    }
-
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         // Handle action bar item clicks here. The action bar will
         // automatically handle clicks on the Home/Up button, so long

app/src/main/res/navigation/shift_navigation.xml

@@ -24,7 +24,7 @@
         android:id="@+id/fragmentAddItem"
         android:name="com.appttude.h_mal.farmr.ui.FragmentAddItem"
         android:label="fragment_add_item"
-        tools:layout="@layout/fragment_add_item" >
+        tools:layout="@layout/fragment_add_item">
         <argument
             android:name="shiftId"
             app:argType="long" />