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When trying to observe live data from the fragment that is returned from the ViewModel I get the following exception before this I got different error elaborated in this post swapping
android.arch.lifecycle:common-java8:1.0.0-beta2 for android.arch.lifecycle:compiler:1.0.0-beta2solved that issue but now I am getting the following exception
You can find the entire code here
E/AndroidRuntime: FATAL EXCEPTION: pool-1-thread-1
Process: com.nrs.nsnik.architecturecomponents, PID: 4114
java.lang.NoClassDefFoundError: Failed resolution of: Landroid/arch/core/executor/AppToolkitTaskExecutor;
at android.arch.persistence.room.InvalidationTracker.addObserver(InvalidationTracker.java:241)
at android.arch.persistence.room.InvalidationTracker.addWeakObserver(InvalidationTracker.java:257)
at com.nrs.nsnik.architecturecomponents.data.NoteDao_Impl$4.compute(NoteDao_Impl.java:146)
at com.nrs.nsnik.architecturecomponents.data.NoteDao_Impl$4.compute(NoteDao_Impl.java:134)
at android.arch.lifecycle.ComputableLiveData$2.run(ComputableLiveData.java:87)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.arch.core.executor.AppToolkitTaskExecutor" on path: DexPathList[[zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/base.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_dependencies_apk.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_slice_0_apk.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_slice_1_apk.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_slice_2_apk.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_slice_3_apk.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_slice_4_apk.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_slice_5_apk.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_slice_6_apk.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_slice_7_apk.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_slice_8_apk.apk", zip file "/data/app/com.nrs.nsnik.architecturecomponents-1/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.nrs.nsnik.architecturecomponents-1/lib/x86, /system/lib, /vendor/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.arch.persistence.room.InvalidationTracker.addObserver(InvalidationTracker.java:241)
at android.arch.persistence.room.InvalidationTracker.addWeakObserver(InvalidationTracker.java:257)
at com.nrs.nsnik.architecturecomponents.data.NoteDao_Impl$4.compute(NoteDao_Impl.java:146)
at com.nrs.nsnik.architecturecomponents.data.NoteDao_Impl$4.compute(NoteDao_Impl.java:134)
at android.arch.lifecycle.ComputableLiveData$2.run(ComputableLiveData.java:87)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Build.Gradle :
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
android {
compileSdkVersion 26
buildToolsVersion "26.0.2"
defaultConfig {
applicationId "com.nrs.nsnik.architecturecomponents"
minSdkVersion 25
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
resConfigs "en"
splits {
abi {
enable true
reset()
include 'x86_64', 'x86', 'armeabi', 'armeabi-v7a', 'arm64-v8a', 'mips'
universalApk false
}
}
javaCompileOptions {
annotationProcessorOptions {
arguments = ["room.schemaLocation": "$projectDir/schemas".toString()]
}
}
}
sourceSets {
androidTest.assets.srcDirs += files("$projectDir/schemas".toString())
}
buildTypes {
release {
shrinkResources true
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
ext.versionCodes = ['armeabi': 3, 'armeabi-v7a': 4, 'arm64-v8a': 5, mips: 6, 'x86': 7, 'x86_64': 8]
import com.android.build.OutputFile
android.applicationVariants.all { variant ->
variant.outputs.each { output ->
output.versionCodeOverride =
project.ext.versionCodes.get(output.getFilter(OutputFile.ABI)) * 1000 + android.defaultConfig.versionCode
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
testImplementation 'junit:junit:4.12'
androidTestImplementation('com.android.support.test.espresso:espresso-core:3.0.1', {
exclude group: 'com.android.support', module: 'support-annotations'
})
//SUPPORT LIBRARY
implementation 'com.android.support:appcompat-v7:26.1.0'
//RECYCLER VIEW
implementation 'com.android.support:recyclerview-v7:26.1.0'
//ANNOTATION SUPPORT LIBRARY
implementation 'com.android.support:support-annotations:26.1.0'
//DESIGN SUPPORT LIBRARY
implementation 'com.android.support:design:26.1.0'
//CONSTRAINT LAYOUT
implementation 'com.android.support.constraint:constraint-layout:1.1.0-beta3'
//KOTLIN
implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
//RX JAVA & ANDROID
implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
implementation 'io.reactivex.rxjava2:rxjava:2.1.4'
//RX BINDING
implementation 'com.jakewharton.rxbinding2:rxbinding:2.0.0'
implementation 'com.jakewharton.rxbinding2:rxbinding-support-v4:2.0.0'
implementation 'com.jakewharton.rxbinding2:rxbinding-appcompat-v7:2.0.0'
implementation 'com.jakewharton.rxbinding2:rxbinding-design:2.0.0'
implementation 'com.jakewharton.rxbinding2:rxbinding-recyclerview-v7:2.0.0'
//TIMBER LOGGER
implementation 'com.jakewharton.timber:timber:4.5.1'
//GUAVA
implementation 'com.google.guava:guava:23.0'
//DAGGER 2
implementation 'com.google.dagger:dagger-android:2.11'
implementation 'com.google.dagger:dagger-android-support:2.11'
annotationProcessor 'com.google.dagger:dagger-compiler:2.11'
//BUTTER KNIFE
implementation 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
//LEAK CANARY
debugImplementation 'com.squareup.leakcanary:leakcanary-android:1.5.4'
releaseImplementation 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.4'
//LIFE CYCLE EXTENSIONS
implementation "android.arch.lifecycle:extensions:1.0.0-alpha9-1"
//LIFE CYCLE JAVA 8
//implementation "android.arch.lifecycle:common-java8:1.0.0-beta2"
implementation "android.arch.lifecycle:runtime:1.0.0"
annotationProcessor "android.arch.lifecycle:compiler:1.0.0-alpha9-1"
//LIVE DATA BACKGROUND TEST
testImplementation "android.arch.core:core-testing:1.0.0-alpha9-1"
//LIVE DATA WITH REACTIVE STREAMS
implementation "android.arch.lifecycle:reactivestreams:1.0.0-alpha9-1"
//ROOM
implementation "android.arch.persistence.room:runtime:1.0.0-alpha9-1"
annotationProcessor "android.arch.persistence.room:compiler:1.0.0-alpha9-1"
//ROOM TEST MIGRATION
testImplementation "android.arch.persistence.room:testing:1.0.0-alpha9-1"
//ROOM RxJAVA
implementation "android.arch.persistence.room:rxjava2:1.0.0-alpha9-1"
//PAGING
implementation "android.arch.paging:runtime:1.0.0-alpha3"
}
817
Your fragment A views are created again and the observer is getting triggered once with cached livedata value and antoher time because the vendor type was set again in onViewCreated. Since we are using switchmap in viewmodel and the livedata was set again the observer in fragment A was getting triggered twice.
Observe LiveData objects In most cases, an app component's onCreate() method is the right place to begin observing a LiveData object for the following reasons: To ensure the system doesn't make redundant calls from an activity or fragment's onResume() method.
Same problem here. I had to change from 1.0.0-beta-2 to version 1.0.0-alpha9-1 to work.
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