IssueTracker

Component used: Navigation Version used: Devices/Android versions reproduced on:

buildscript {
    ext {
        compose_version = '1.0.0-alpha07'
        nav_compose_version = '1.0.0-alpha02'
        retrofit_version = '2.9.0'
        coroutines_version = '1.3.9'
        dagger_hilt_version = '2.28-alpha'
        nav_version = '2.3.1'
    }
    ext.kotlin_version = "1.4.10"
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.2.0-alpha16"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "com.google.dagger:hilt-android-gradle-plugin:$dagger_hilt_version"
        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-kapt'
    id 'dagger.hilt.android.plugin'
    id 'androidx.navigation.safeargs.kotlin'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.2"

    defaultConfig {
        applicationId "com.enciyo.jetspacex"
        minSdkVersion 30
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"
        multiDexEnabled true
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            buildConfigField "String", "BASE_URL", '"https://api.spacexdata.com/v4/"'
        }
        debug{
            buildConfigField "String", "BASE_URL", '"https://api.spacexdata.com/v4/"'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
        useIR = true
    }
    buildFeatures {
        compose true
    }
    composeOptions {
        kotlinCompilerExtensionVersion compose_version
        kotlinCompilerVersion '1.4.10'
    }
    packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/ASL2.0'
        exclude("META-INF/*.kotlin_module")
    }
}

dependencies {

    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.3.2'
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.2.1'
    implementation "androidx.compose.ui:ui:$compose_version"
    implementation "androidx.compose.material:material:$compose_version"
    implementation "androidx.ui:ui-tooling:$compose_version"
    implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.0-beta01'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

    //Nav Compose
    implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
    implementation "androidx.navigation:navigation-compose:$nav_compose_version"

    //Retrofit
    implementation "com.squareup.retrofit2:retrofit:$retrofit_version"
    implementation "com.squareup.retrofit2:converter-gson:$retrofit_version"

    //Coroutines
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines_version"
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutines_version"

    //Dagger Hilt
    implementation "androidx.hilt:hilt-lifecycle-viewmodel:1.0.0-alpha02"
    implementation "com.google.dagger:hilt-android:$dagger_hilt_version"
    kapt "com.google.dagger:hilt-android-compiler:$dagger_hilt_version"
    kapt 'androidx.hilt:hilt-compiler:1.0.0-alpha02'

    //KTX ext
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.3.0-beta01"
    implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.3.0-beta01"
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.0-beta01"
    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
    implementation 'androidx.lifecycle:lifecycle-common-java8:2.2.0'

    // to use kotlin activity extensions for ViewModel
    implementation 'androidx.activity:activity-ktx:1.1.0'
    implementation 'androidx.ui:ui-livedata:0.1.0-dev14'


}

package com.enciyo.jetspacex

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.padding
import androidx.compose.material.Icon
import androidx.compose.material.Scaffold
import androidx.compose.material.Text
import androidx.compose.material.TopAppBar
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.ArrowBack
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.setContent
import androidx.compose.ui.unit.dp
import androidx.navigation.NavHostController
import androidx.navigation.compose.*
import androidx.ui.tooling.preview.Preview
import com.enciyo.jetspacex.ui.DashboardScreen
import com.enciyo.jetspacex.ui.LoginScreen
import com.enciyo.jetspacex.ui.SplashScreen
import com.enciyo.jetspacex.util.AppbarModel
import com.enciyo.jetspacex.util.Screen
import com.enciyo.jetspacex.util.Screen.*
import dagger.hilt.android.AndroidEntryPoint

@AndroidEntryPoint
class MainActivity : AppCompatActivity() {


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            MainScreen()
        }
    }

}

@Composable
fun MainScreen() {
    val state = mutableStateOf(Splash.appBarModel)
    val navController = rememberNavController()
    val routeName = navController.currentBackStackEntryAsState().value?.arguments?.get(KEY_ROUTE)
    Screen.values().find { it.routeName == routeName }?.let {
        state.value = it.appBarModel
    }
    Scaffold(
        topBar = {
            MainTopBar(screen = state.value, navController = navController)
        },
        bodyContent = { MainBodyContent(navController) }
    )


}
@Composable
fun MainTopBar(
    screen: AppbarModel,
    navController: NavHostController
) {
    val backIcon: @Composable () -> Unit = {
        Icon(
            asset = Icons.Default.ArrowBack,
            modifier = Modifier
                .padding(start = 16.dp)
                .clickable(onClick = {
                    navController.popBackStack()
                })
        )
    }
    if (screen.isShow)
        TopAppBar(
            title = { Text(text = screen.title.toString()) },
            backgroundColor = Color(android.graphics.Color.parseColor("#FF3700B3")),
            navigationIcon = if (navController.backStack.size > 2) backIcon else null
        )
}
@Composable
fun MainBodyContent(navController: NavHostController) {
    NavHost(
        navController = navController,
        startDestination = Splash.routeName,
        route = Splash.routeName,
        builder = {
            composable(Splash.routeName) { SplashScreen(navController) }
            composable(Login.routeName) { LoginScreen(navController) }
            composable(Dashboard.routeName) { DashboardScreen(navController) }
        }
    )
}

After rotated screen popBackStack() doesnt work. Application does not crash.