Multi-feature Instant App crash issue

Question

I am newbie to Instant app in android and following below link for reference: https://codelabs.developers.google.com/codelabs/android-instant-apps/#6

Installable apk and instant app with single feature is working fine.

But when I am trying to run Multi- feature instant app it's getting crash(Following step - 7 from the above link).

Crash Report:

 E: FATAL EXCEPTION: main
    Process: com.bhaveshdesai.topekaapk, PID: 17609
    java.lang.IncompatibleClassChangeError: Structural change of android.support.v4.app.Fragment is hazardous (/data/app/com.bhaveshdesai.topekaapk-PhiyPZ303gxpikP7GugKyA==/oat/x86/split_topekaui.odex at compile time, /data/app/com.bhaveshdesai.topekaapk-PhiyPZ303gxpikP7GugKyA==/oat/x86/base.odex at runtime): Virtual method count off: 111 vs 150
    Landroid/support/v4/app/Fragment; (Compile time):
    Static fields:
     I ACTIVITY_CREATED
     I CREATED
     I INITIALIZING
     I RESUMED
     I STARTED
     I STOPPED
     .....

Feature Gradle File:

apply plugin: 'com.android.feature'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.0"
    dataBinding {
        enabled true
    }

    defaultConfig {
        minSdkVersion 19
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation project(':topeka-base')
}

App Gradle File:

/*
 * Copyright 2015 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

//apply plugin: 'com.android.application'
apply plugin: 'com.android.feature'
android {
    baseFeature = true

    compileSdkVersion 26
    buildToolsVersion "26.0.0"

    dataBinding {
        enabled = true
    }

    defaultConfig {
        minSdkVersion 19
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'
    }

    buildTypes {
        release {
            minifyEnabled false
        }
    }

    packagingOptions {
        exclude 'LICENSE.txt'
    }
}

ext {
    supportLibVersion = "25.4.0"
    espressoVersion = "2.2.2"
    androidTestVersion = "0.5"
    hamcrestVersion = "1.3"
    junitVersion = "4.12"
}

dependencies {
    api "com.android.support:appcompat-v7:${supportLibVersion}"
    api "com.android.support:cardview-v7:${supportLibVersion}"
    api "com.android.support:design:${supportLibVersion}"
    api "com.android.support:recyclerview-v7:${supportLibVersion}"
    api "com.android.support.test.espresso:espresso-idling-resource:${espressoVersion}"
    testApi "junit:junit:${junitVersion}"

    androidTestApi("com.android.support.test.espresso:espresso-core:${espressoVersion}") {
        exclude module: "espresso-idling-resource"
        exclude group: "com.android.support"
    }
    androidTestApi("com.android.support.test.espresso:espresso-contrib:${espressoVersion}") {
        exclude module: "espresso-core"
        exclude module: "recyclerview-v7"
        exclude group: "com.android.support"
    }
    androidTestApi("com.android.support.test:rules:${androidTestVersion}") {
        exclude group: "com.android.support"
    }

    androidTestApi("com.android.support.test:runner:${androidTestVersion}") {
        exclude group: "com.android.support"
    }

    androidTestApi "org.hamcrest:hamcrest-core:${hamcrestVersion}"

    feature project(":topekaui")
    application project(":topekaapk")
}

Please help me to solve this crash.

Answer 1

After so much try i found the problem.

Problem is due to use android.support.v4.app.Fragment

After change android.support.v4.app.Fragment to android.app.Fragment its working.

Answer 2

IncompatibleClassChangeError typically happens when you make an incompatible binary change to the library and don't recompile the client code. See What causes java.lang.IncompatibleClassChangeError? (but this might not be the real cause of your issue)

After what step are you getting the crash?

However, what I can see right now is that your Feature gradle file has the following dependency implementation project(':topeka-base') , when it should contain api project(':topeka-base') instead. (assuming that your Feature gradle = topeka-ui gradle)

topeka-ui/build.gradle

Replace all pre-generated dependencies with the following dependency:

 dependencies { api project(':topeka-base') } 

Please double check the codelab instructions to make sure you didn't miss any steps.