Problem: Fragment is not changed to next fragment
Condition: Using BottomNavigationView, Navigation component and multi-module app
Action:
- launch app on emulator
- when launched app, home fragment will be shown
- when tapped message icon or my page icon, the fragment is not changed
My Inspection: I debugged the application when tapped the ic ons to change fragment, in NavController.java
NavDestination newDest = navigator.navigate(node, finalArgs,
navOptions, navigatorExtras);
returns the expected fragment, but the fragment does not change...
Project Structure:
- app
- layout
- activity_main.xml
- layout
- core
- navigation
- navigation.xml
- menu
- menu.xml
- navigation
- features
- home
- fragment_home.xml
- message
- fragment_message.xml
- mypage
- fragment_my_page.xml
- home
Code:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/container">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/nav_view"
app:menu="@menu/bottom_nav_menu" />
<androidx.fragment.app.FragmentContainerView
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
app:defaultNavHost="true"
app:navGraph="@navigation/navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
bottom_nav_menu.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/navigation_home"
android:icon="@drawable/ic_dashboard_black_24dp"
android:title="@string/title_home"
android:enabled="true"/>
<item
android:id="@+id/navigation_message"
android:icon="@drawable/ic_notifications_black_24dp"
android:title="@string/title_message"
android:enabled="true"/>
<item
android:id="@+id/navigation_mypage"
android:icon="@drawable/ic_notifications_black_24dp"
android:title="@string/title_mypage"
android:enabled="true" />
</menu>
navigation.xml
<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/navigation"
app:startDestination="@+id/navigation_home">
<fragment
android:id="@+id/navigation_home"
android:name="app.home.HomeFragment"
android:label="@string/title_home" />
<fragment
android:id="@+id/navigation_message"
android:name="app.message.MessageFragment"
android:label="@string/title_message"/>
<fragment
android:id="@+id/navigation_mypage"
android:name="app.mypage.MyPageFragment"
android:label="@string/title_mypage" />
</navigation>
MainActivity.kt
class MainActivity : AppCompatActivity() {
private val binding: ActivityMainBinding by lazy {
DataBindingUtil.setContentView<ActivityMainBinding>(
this,
R.layout.activity_main
)
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val navView: BottomNavigationView = binding.navView
val navHostFragment = supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
navView.setupWithNavController(navHostFragment.navController)
navView.setOnNavigationItemSelectedListener { item:MenuItem ->
Log.d("main", "setOnNavigationItemSelectedListener " + item)
navHostFragment.navController.navigate(item.itemId)
true
}
}
build.gradle(app)
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
apply plugin: "androidx.navigation.safeargs"
android {
compileSdkVersion 29
buildToolsVersion "29.0.3"
repositories {
google()
}
defaultConfig {
applicationId "app"
minSdkVersion 26
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
flavorDimensions "default"
productFlavors {
develop {
applicationIdSuffix ".develop"
}
staging {
applicationIdSuffix ".staging"
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
buildFeatures{
dataBinding = true
}
}
dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
//
implementation project(":core")
implementation project(":features:home")
implementation project(":features:message")
implementation project(":features:mypage")
//
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.3.0'
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'com.google.android.material:material:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.navigation:navigation-fragment:2.2.2'
implementation 'androidx.navigation:navigation-ui:2.2.2'
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
implementation 'androidx.navigation:navigation-fragment-ktx:2.2.2'
implementation 'androidx.navigation:navigation-ui-ktx:2.2.2'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.recyclerview:recyclerview:1.1.0'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}
When I tried to create activity from BottomNavigationView of Android Studio's template, it worked well. However I tried to separated into multi-module app, it doesn't work well.
any advice??
