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235 changes: 235 additions & 0 deletions
235
app/src/main/java/com/mashup/util/NavigationExtension.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,235 @@ | ||
| package com.mashup.util | ||
|
|
||
| import android.content.Intent | ||
| import android.util.SparseArray | ||
| import androidx.core.util.forEach | ||
| import androidx.core.util.set | ||
| import androidx.fragment.app.FragmentManager | ||
| import androidx.lifecycle.LiveData | ||
| import androidx.lifecycle.MutableLiveData | ||
| import androidx.navigation.NavController | ||
| import androidx.navigation.fragment.NavHostFragment | ||
| import com.google.android.material.bottomnavigation.BottomNavigationView | ||
| import com.mashup.R | ||
|
|
||
| /** | ||
| * Manages the various graphs needed for a [BottomNavigationView]. | ||
| * | ||
| * This sample is a workaround until the Navigation Component supports multiple back stacks. | ||
| */ | ||
| fun BottomNavigationView.setupWithNavController( | ||
| navGraphIds: List<Int>, | ||
| fragmentManager: FragmentManager, | ||
| containerId: Int, | ||
| intent: Intent | ||
| ): LiveData<NavController> { | ||
|
|
||
| // Map of tags | ||
| val graphIdToTagMap = SparseArray<String>() | ||
| // Result. Mutable live data with the selected controlled | ||
| val selectedNavController = MutableLiveData<NavController>() | ||
|
|
||
| var firstFragmentGraphId = 0 | ||
|
|
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| // First create a NavHostFragment for each NavGraph ID | ||
| navGraphIds.forEachIndexed { index, navGraphId -> | ||
| val fragmentTag = getFragmentTag(index) | ||
|
|
||
| // Find or create the Navigation host fragment | ||
| val navHostFragment = obtainNavHostFragment( | ||
| fragmentManager, | ||
| fragmentTag, | ||
| navGraphId, | ||
| containerId | ||
| ) | ||
|
|
||
| // Obtain its id | ||
| val graphId = navHostFragment.navController.graph.id | ||
|
|
||
| if (index == 0) { | ||
| firstFragmentGraphId = graphId | ||
| } | ||
|
|
||
| // Save to the map | ||
| graphIdToTagMap[graphId] = fragmentTag | ||
|
|
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| // Attach or detach nav host fragment depending on whether it's the selected item. | ||
| if (this.selectedItemId == graphId) { | ||
| // Update livedata with the selected graph | ||
| selectedNavController.value = navHostFragment.navController | ||
| attachNavHostFragment(fragmentManager, navHostFragment, index == 0) | ||
| } else { | ||
| detachNavHostFragment(fragmentManager, navHostFragment) | ||
| } | ||
| } | ||
|
|
||
| // Now connect selecting an item with swapping Fragments | ||
| var selectedItemTag = graphIdToTagMap[this.selectedItemId] | ||
| val firstFragmentTag = graphIdToTagMap[firstFragmentGraphId] | ||
| var isOnFirstFragment = selectedItemTag == firstFragmentTag | ||
|
|
||
| // When a navigation item is selected | ||
| setOnNavigationItemSelectedListener { item -> | ||
| // Don't do anything if the state is state has already been saved. | ||
| if (fragmentManager.isStateSaved) { | ||
| false | ||
| } else { | ||
| val newlySelectedItemTag = graphIdToTagMap[item.itemId] | ||
| if (selectedItemTag != newlySelectedItemTag) { | ||
| // Pop everything above the first fragment (the "fixed start destination") | ||
| fragmentManager.popBackStack(firstFragmentTag, | ||
| FragmentManager.POP_BACK_STACK_INCLUSIVE) | ||
| val selectedFragment = fragmentManager.findFragmentByTag(newlySelectedItemTag) | ||
| as NavHostFragment | ||
|
|
||
| // Exclude the first fragment tag because it's always in the back stack. | ||
| if (firstFragmentTag != newlySelectedItemTag) { | ||
| // Commit a transaction that cleans the back stack and adds the first fragment | ||
| // to it, creating the fixed started destination. | ||
| fragmentManager.beginTransaction() | ||
| .setCustomAnimations( | ||
| R.anim.nav_default_enter_anim, | ||
| R.anim.nav_default_exit_anim, | ||
| R.anim.nav_default_pop_enter_anim, | ||
| R.anim.nav_default_pop_exit_anim) | ||
| .attach(selectedFragment) | ||
| .setPrimaryNavigationFragment(selectedFragment) | ||
| .apply { | ||
| // Detach all other Fragments | ||
| graphIdToTagMap.forEach { _, fragmentTagIter -> | ||
| if (fragmentTagIter != newlySelectedItemTag) { | ||
| detach(fragmentManager.findFragmentByTag(firstFragmentTag)!!) | ||
| } | ||
| } | ||
| } | ||
| .addToBackStack(firstFragmentTag) | ||
| .setReorderingAllowed(true) | ||
| .commit() | ||
| } | ||
| selectedItemTag = newlySelectedItemTag | ||
| isOnFirstFragment = selectedItemTag == firstFragmentTag | ||
| selectedNavController.value = selectedFragment.navController | ||
| true | ||
| } else { | ||
| false | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Optional: on item reselected, pop back stack to the destination of the graph | ||
| setupItemReselected(graphIdToTagMap, fragmentManager) | ||
|
|
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| // Handle deep link | ||
| setupDeepLinks(navGraphIds, fragmentManager, containerId, intent) | ||
|
|
||
| // Finally, ensure that we update our BottomNavigationView when the back stack changes | ||
| fragmentManager.addOnBackStackChangedListener { | ||
| if (!isOnFirstFragment && !fragmentManager.isOnBackStack(firstFragmentTag)) { | ||
| this.selectedItemId = firstFragmentGraphId | ||
| } | ||
|
|
||
| // Reset the graph if the currentDestination is not valid (happens when the back | ||
| // stack is popped after using the back button). | ||
| selectedNavController.value?.let { controller -> | ||
| if (controller.currentDestination == null) { | ||
| controller.navigate(controller.graph.id) | ||
| } | ||
| } | ||
| } | ||
| return selectedNavController | ||
| } | ||
|
|
||
| private fun BottomNavigationView.setupDeepLinks( | ||
| navGraphIds: List<Int>, | ||
| fragmentManager: FragmentManager, | ||
| containerId: Int, | ||
| intent: Intent | ||
| ) { | ||
| navGraphIds.forEachIndexed { index, navGraphId -> | ||
| val fragmentTag = getFragmentTag(index) | ||
|
|
||
| // Find or create the Navigation host fragment | ||
| val navHostFragment = obtainNavHostFragment( | ||
| fragmentManager, | ||
| fragmentTag, | ||
| navGraphId, | ||
| containerId | ||
| ) | ||
| // Handle Intent | ||
| if (navHostFragment.navController.handleDeepLink(intent) | ||
| && selectedItemId != navHostFragment.navController.graph.id) { | ||
| this.selectedItemId = navHostFragment.navController.graph.id | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private fun BottomNavigationView.setupItemReselected( | ||
| graphIdToTagMap: SparseArray<String>, | ||
| fragmentManager: FragmentManager | ||
| ) { | ||
| setOnNavigationItemReselectedListener { item -> | ||
| val newlySelectedItemTag = graphIdToTagMap[item.itemId] | ||
| val selectedFragment = fragmentManager.findFragmentByTag(newlySelectedItemTag) | ||
| as NavHostFragment | ||
| val navController = selectedFragment.navController | ||
| // Pop the back stack to the start destination of the current navController graph | ||
| navController.popBackStack( | ||
| navController.graph.startDestination, false | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| private fun detachNavHostFragment( | ||
| fragmentManager: FragmentManager, | ||
| navHostFragment: NavHostFragment | ||
| ) { | ||
| fragmentManager.beginTransaction() | ||
| .detach(navHostFragment) | ||
| .commitNow() | ||
| } | ||
|
|
||
| private fun attachNavHostFragment( | ||
| fragmentManager: FragmentManager, | ||
| navHostFragment: NavHostFragment, | ||
| isPrimaryNavFragment: Boolean | ||
| ) { | ||
| fragmentManager.beginTransaction() | ||
| .attach(navHostFragment) | ||
| .apply { | ||
| if (isPrimaryNavFragment) { | ||
| setPrimaryNavigationFragment(navHostFragment) | ||
| } | ||
| } | ||
| .commitNow() | ||
|
|
||
| } | ||
|
|
||
| private fun obtainNavHostFragment( | ||
| fragmentManager: FragmentManager, | ||
| fragmentTag: String, | ||
| navGraphId: Int, | ||
| containerId: Int | ||
| ): NavHostFragment { | ||
| // If the Nav Host fragment exists, return it | ||
| val existingFragment = fragmentManager.findFragmentByTag(fragmentTag) as NavHostFragment? | ||
| existingFragment?.let { return it } | ||
|
|
||
| // Otherwise, create it and return it. | ||
| val navHostFragment = NavHostFragment.create(navGraphId) | ||
| fragmentManager.beginTransaction() | ||
| .add(containerId, navHostFragment, fragmentTag) | ||
| .commitNow() | ||
| return navHostFragment | ||
| } | ||
|
|
||
| private fun FragmentManager.isOnBackStack(backStackName: String): Boolean { | ||
| val backStackCount = backStackEntryCount | ||
| for (index in 0 until backStackCount) { | ||
| if (getBackStackEntryAt(index).name == backStackName) { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| private fun getFragmentTag(index: Int) = "bottomNavigation#$index" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| <?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/setting" | ||
| app:startDestination="@+id/navigation_setting"> | ||
| <fragment | ||
| android:id="@+id/navigation_setting" | ||
| android:name="com.mashup.app.setting.SettingFragment" | ||
| android:label="@string/title_setting" | ||
| tools:layout="@layout/setting_fragment" /> | ||
| </navigation> |