anitab-org · unc0ded · May 30, 2021
@@ -4,6 +4,7 @@ plugins {
  kotlin("kapt")
 
  id("kotlin-android-extensions")
+ id("androidx.navigation.safeargs.kotlin")
 }
 android {
  compileSdkVersion(Versions.compileSdkVersion)
@@ -82,6 +83,8 @@ dependencies {
 
  implementation(Dependencies.fragment_ktx)
 
+ implementation(Dependencies.navigation_fragment)
+ implementation(Dependencies.navigation_ui)
  implementation(Dependencies.viewPager2)
  implementation(Dependencies.swipe_refresh_layout)
 }
@@ -1,27 +1,24 @@
 package org.systers.mentorship.view.activities
 
-import android.content.Intent
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
 import android.widget.Toast
-import com.google.android.material.bottomnavigation.BottomNavigationView
+import androidx.activity.OnBackPressedCallback
+import androidx.navigation.findNavController
+import androidx.navigation.fragment.NavHostFragment
+import androidx.navigation.ui.AppBarConfiguration
+import androidx.navigation.ui.onNavDestinationSelected
+import androidx.navigation.ui.setupWithNavController
 import kotlinx.android.synthetic.main.activity_main.*
 import org.systers.mentorship.R
 import org.systers.mentorship.utils.PreferenceManager
-import org.systers.mentorship.view.fragments.HomeFragment
-import org.systers.mentorship.view.fragments.MembersFragment
-import org.systers.mentorship.view.fragments.ProfileFragment
-import org.systers.mentorship.view.fragments.RelationPagerFragment
-import org.systers.mentorship.view.fragments.RequestsFragment
 
 /**
  * This activity has the bottom navigation which allows the user to switch between fragments
  */
 class MainActivity : BaseActivity() {
 
- private var atHome = true
-
  private val TOAST_DURATION = 4000
  private var mLastPress: Long = 0
  private lateinit var exitToast: Toast
@@ -32,96 +29,59 @@ class MainActivity : BaseActivity() {
  super.onCreate(savedInstanceState)
  setContentView(R.layout.activity_main)
  setSupportActionBar(toolbar)
- bottomNavigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)
  bottomNavigation.setOnNavigationItemReselectedListener { }
 
- if (savedInstanceState == null) {
- showHomeFragment()
- } else {
- atHome = savedInstanceState.getBoolean("atHome")
- }
- }
+ val navHostFragment =
+ supportFragmentManager.findFragmentById(R.id.contentFrame) as NavHostFragment
+ val navController = navHostFragment.navController
+ // Specify top-level destinations
+ val appBarConfiguration = AppBarConfiguration(
+ setOf(
+ R.id.navigation_home,
+ R.id.navigation_profile,
+ R.id.navigation_relation,
+ R.id.navigation_members,
+ R.id.navigation_requests
+ )
+ )
+ // Setup toolbar to automatically show title based on label specified in nav graph
+ collapsingToolbarLayout.setupWithNavController(toolbar, navController, appBarConfiguration)
+ // Setup bottom nav to automatically handle navigation based on nav graph and bottom nav menu
+ bottomNavigation.setupWithNavController(navController)
 
- private val mOnNavigationItemSelectedListener =
- BottomNavigationView.OnNavigationItemSelectedListener { item ->
- when (item.itemId) {
- R.id.navigation_home -> {
- replaceFragment(R.id.contentFrame, HomeFragment.newInstance(),
- R.string.fragment_title_home)
- atHome = true
- return@OnNavigationItemSelectedListener true
- }
- R.id.navigation_profile -> {
- replaceFragment(R.id.contentFrame, ProfileFragment.newInstance(),
- R.string.fragment_title_profile)
- atHome = false
- return@OnNavigationItemSelectedListener true
- }
- R.id.navigation_relation -> {
- replaceFragment(R.id.contentFrame, RelationPagerFragment.newInstance(),
- R.string.fragment_title_relation)
- atHome = false
- return@OnNavigationItemSelectedListener true
- }
- R.id.navigation_members -> {
- replaceFragment(R.id.contentFrame, MembersFragment.newInstance(),
- R.string.fragment_title_members)
- atHome = false
- return@OnNavigationItemSelectedListener true
- }
- R.id.navigation_requests -> {
- replaceFragment(R.id.contentFrame, RequestsFragment.newInstance(),
- R.string.fragment_title_requests)
- atHome = false
- return@OnNavigationItemSelectedListener true
+ onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
+ override fun handleOnBackPressed() {
+ if (navController.currentDestination?.id == R.id.navigation_home) {
+ val currentTime = System.currentTimeMillis()
+ if (currentTime - mLastPress > TOAST_DURATION) {
+ exitToast = Toast.makeText(
+ baseContext,
+ getString(R.string.exit_toast),
+ Toast.LENGTH_LONG
+ )
+ exitToast.show()
+ mLastPress = currentTime
+ } else {
+ exitToast.cancel() // Hide toast on App exit
+ isEnabled = false
+ onBackPressed()
  }
+ } else {
+ isEnabled = false
+ onBackPressed()
+ isEnabled = true
  }
- false
  }
+ })
+ }
 
  override fun onCreateOptionsMenu(menu: Menu): Boolean {
  menuInflater.inflate(R.menu.main_menu, menu)
- return true
- }
-
- override fun onOptionsItemSelected(item: MenuItem) =
- when (item.itemId) {
- R.id.menu_settings -> {
- startActivity(Intent(this, SettingsActivity::class.java))
- true
- }
- else -> false
- }
-
- private fun showHomeFragment() {
- atHome = true
- bottomNavigation.selectedItemId = R.id.navigation_home
- replaceFragment(R.id.contentFrame, HomeFragment.newInstance(), R.string.fragment_title_home)
- }
-
- override fun onSaveInstanceState(outState: Bundle) {
- super.onSaveInstanceState(outState)
-
- outState.putBoolean("atHome", atHome)
- }
-
- private fun showToast() {
- val currentTime = System.currentTimeMillis()
- if (currentTime - mLastPress > TOAST_DURATION) {
- exitToast = Toast.makeText(baseContext, getString(R.string.exit_toast), Toast.LENGTH_LONG)
- exitToast.show()
- mLastPress = currentTime
- } else {
- exitToast.cancel() // Hide toast on App exit
- super.onBackPressed()
- }
+ return super.onCreateOptionsMenu(menu)
  }
 
- override fun onBackPressed() {
- if (!atHome) {
- showHomeFragment()
- } else {
- showToast()
- }
+ override fun onOptionsItemSelected(item: MenuItem): Boolean {
+ val navController = findNavController(R.id.contentFrame)
+ return item.onNavDestinationSelected(navController) || super.onOptionsItemSelected(item)
  }
 }
@@ -18,7 +18,6 @@ class SettingsActivity : BaseActivity() {
 
  supportActionBar?.title = getString(R.string.settings)
  supportActionBar?.setDisplayHomeAsUpEnabled(true)
- supportActionBar?.setDisplayShowHomeEnabled(true)
 
  tvLogout.setOnClickListener {
  val builder = AlertDialog.Builder(this)

@@ -27,10 +27,6 @@ class HomeFragment : BaseFragment() {
  private lateinit var achievementsAdapter: AchievementsAdapter
 
  companion object {
- /**
- * Creates an instance of HomeFragment
- */
- fun newInstance() = HomeFragment()
  val TAG: String = HomeFragment::class.java.simpleName
  }
 

@@ -38,13 +38,6 @@ import org.systers.mentorship.viewmodels.MembersViewModel
  */
 class MembersFragment : BaseFragment() {
 
- companion object {
- /**
- * Creates an instance of [MembersFragment]
- */
- fun newInstance() = MembersFragment()
- }
-
  private var memberListInitialized = false
 
  private val membersViewModel: MembersViewModel by viewModels()

@@ -21,10 +21,6 @@ import org.systers.mentorship.viewmodels.ProfileViewModel
 class ProfileFragment : BaseFragment() {
 
  companion object {
- /**
- * Creates an instance of ProfileFragment
- */
- fun newInstance() = ProfileFragment()
  val TAG: String = ProfileFragment::class.java.simpleName
  }
 
@@ -73,7 +69,7 @@ class ProfileFragment : BaseFragment() {
  editProfileFragment.setOnDismissListener {
  fetchNewest()
  }
- fragmentManager?.let { editProfileFragment.show(it, getString(R.string.fragment_title_edit_profile)) }
+ childFragmentManager.let { editProfileFragment.show(it, getString(R.string.fragment_title_edit_profile)) }
  }
  true
  }

@@ -79,7 +79,6 @@ class RelationPagerFragment : BaseFragment() {
  baseActivity.tlMentorshipRelation.removeAllTabs()
  tvFindPeopleBtn.setOnClickListener {
  baseActivity.bottomNavigation.selectedItemId = R.id.navigation_members
- baseActivity.replaceFragment(R.id.contentFrame, MembersFragment.newInstance(), R.string.navigation_title_members)
  }
  } else {
  tvNoCurrentRelation.visibility = View.GONE

@@ -18,12 +18,7 @@ import org.systers.mentorship.viewmodels.RequestsViewModel
 class RequestsFragment : BaseFragment() {
 
  companion object {
- /**
- * Creates an instance of [RequestsFragment]
- */
- fun newInstance() = RequestsFragment()
-
- val TAG = RelationFragment::class.java.simpleName
+ val TAG = RequestsFragment::class.java.simpleName
  }
 
  private val requestsViewModel: RequestsViewModel by viewModels()

@@ -56,7 +56,10 @@
  android:fillViewport="true"
  app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
- <FrameLayout
+ <androidx.fragment.app.FragmentContainerView
+ android:name="androidx.navigation.fragment.NavHostFragment"
+ app:navGraph="@navigation/main_navigation"
+ app:defaultNavHost="true"
  android:id="@+id/contentFrame"
  android:layout_width="match_parent"
  android:layout_height="wrap_content" />

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?>
+<navigation
+ xmlns:android="http://schemas.android.com/apk/res/android"
+ xmlns:app="http://schemas.android.com/apk/res-auto"
+ xmlns:tools="http://schemas.android.com/tools"
+ android:id="@+id/main_navigation"
+ app:startDestination="@id/navigation_home">
+
+ <fragment
+ android:id="@+id/navigation_home"
+ android:name="org.systers.mentorship.view.fragments.HomeFragment"
+ tools:layout="@layout/fragment_home"
+ android:label="@string/fragment_title_home" />
+
+ <fragment
+ android:id="@+id/navigation_profile"
+ android:name="org.systers.mentorship.view.fragments.ProfileFragment"
+ tools:layout="@layout/fragment_profile"
+ android:label="@string/fragment_title_profile" />
+
+ <fragment
+ android:id="@+id/navigation_relation"
+ android:name="org.systers.mentorship.view.fragments.RelationPagerFragment"
+ tools:layout="@layout/fragment_relation_pager"
+ android:label="@string/fragment_title_relation" />
+
+ <fragment
+ android:id="@+id/navigation_members"
+ android:name="org.systers.mentorship.view.fragments.MembersFragment"
+ tools:layout="@layout/fragment_members"
+ android:label="@string/fragment_title_members" />
+
+ <fragment
+ android:id="@+id/navigation_requests"
+ android:name="org.systers.mentorship.view.fragments.RequestsFragment"
+ tools:layout="@layout/fragment_requests"
+ android:label="@string/fragment_title_requests" />
+
+ <activity
+ android:id="@+id/menu_settings"
+ android:name="org.systers.mentorship.view.activities.SettingsActivity"
+ android:label="@string/settings"
+ tools:layout="@layout/activity_settings" />
+
+</navigation>
@@ -11,8 +11,7 @@
  <item name="android:windowContentTransitions">true</item>
  </style>
 
- <style name="AppTheme.NoActionBar">
- <item name="windowActionBar">false</item>
- <item name="windowNoTitle">true</item>
- </style>
+ <style
+ name="AppTheme.NoActionBar"
+ parent="Theme.MaterialComponents.Light.NoActionBar" />
 </resources>
@@ -11,10 +11,9 @@
  <item name="android:windowAnimationStyle">@style/CustomActivityAnimation</item>
  </style>
 
- <style name="AppTheme.NoActionBar">
- <item name="windowActionBar">false</item>
- <item name="windowNoTitle">true</item>
- </style>
+ <style
+ name="AppTheme.NoActionBar"
+ parent="Theme.MaterialComponents.Light.NoActionBar" />
 
  <style
  name="FilterTheme"

@@ -13,6 +13,7 @@ buildscript {
  dependencies {
  classpath(Dependencies.gradle_build_tool)
  classpath(Dependencies.kotlin_gradle_plugin)
+ classpath(Dependencies.navigation_safe_args_plugin)
 
  // NOTE: Do not place your application dependencies here; they belong
  // in the individual module build.gradle files

@@ -32,6 +32,7 @@ object Versions {
  const val appCompat = "1.0.2"
  const val circleImageView = "3.0.1"
  const val fragmentKtx = "1.2.5"
+ const val navigationVersion = "2.3.5"
 }
 
 /**
@@ -67,4 +68,7 @@ object Dependencies {
  const val fragment_ktx = "androidx.fragment:fragment-ktx:${Versions.fragmentKtx}"
  const val viewPager2 = "androidx.viewpager2:viewpager2:${Versions.viewPager2}"
  const val swipe_refresh_layout = "androidx.swiperefreshlayout:swiperefreshlayout:${Versions.swipeRefreshLayout}"
+ const val navigation_fragment = "androidx.navigation:navigation-fragment-ktx:${Versions.navigationVersion}"
+ const val navigation_ui = "androidx.navigation:navigation-ui-ktx:${Versions.navigationVersion}"
+ const val navigation_safe_args_plugin = "androidx.navigation:navigation-safe-args-gradle-plugin:${Versions.navigationVersion}"
 }