我刚刚将ViewModel和LiveData添加到了build.gradle中，这导致崩溃。需要明确的是，这是在没有向导入中添加任何新代码的情况下发生的。
由于没有要粘贴的代码，因此我将包括gradle依赖项和logcat->
依赖项：
dependencies {
api 'androidx.annotation:annotation:1.0.1'
api 'androidx.recyclerview:recyclerview:1.0.0'
api 'androidx.appcompat:appcompat:1.0.2'
api 'com.google.android.material:material:1.0.0'
api 'androidx.browser:browser:1.0.0'
api 'androidx.exifinterface:exifinterface:1.0.0'
api 'androidx.vectordrawable:vectordrawable-animated:1.0.0'
api 'androidx.multidex:multidex:2.0.1'
api 'androidx.constraintlayout:constraintlayout:2.0.0-alpha3'
api "com.google.android.gms:play-services-base:16.1.0"
api "com.google.firebase:firebase-appindexing:17.1.0"
api "com.google.firebase:firebase-messaging:17.3.4"
api files('src/main/libs/adobeMobileLibrary-4.17.2.jar')
api files('src/main/libs/YouTubeAndroidPlayerApi.jar')
api project(':PhotoView')
api 'com.my.project:assets:2.4.0.34@aar'
api 'com.chaoticmoon.chaosengine:volley-gson-networking:1.1.3@aar'
api 'com.chaoticmoon.chaosengine:utils:0.2.3@aar'
api 'org.apache.commons:commons-lang3:3.8.1'
api 'com.squareup.retrofit2:retrofit:2.5.0'
api 'com.squareup.retrofit2:converter-gson:2.5.0'
api 'com.squareup.retrofit2:adapter-rxjava2:2.5.0'
api 'com.squareup.okhttp3:logging-interceptor:3.11.0'
api 'com.squareup.okhttp3:okhttp:3.12.0'
api 'io.reactivex.rxjava2:rxandroid:2.1.0'
api 'io.reactivex.rxjava2:rxjava:2.2.2'
api 'com.squareup.picasso:picasso:2.71828'
def lifecycle_version = "2.0.0"
// ViewModel and LiveData
implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"
implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"
api 'com.jakewharton:butterknife:10.0.0'
annotationProcessor 'com.jakewharton:butterknife-compiler:10.0.0'
api 'com.android.volley:volley:1.1.0'
api 'se.emilsjolander:stickylistheaders:2.1.0'
api 'com.newrelic.agent.android:android-agent:5.22.0'
api 'com.facebook.stetho:stetho:1.5.0'
api 'com.android.billingclient:billing:1.1'
api 'com.google.android.gms:play-services-ads-identifier:16.0.0'
api 'com.android.installreferrer:installreferrer:1.0'
api 'com.tealium:library:5.5.4'
api 'com.kochava.base:tracker:3.5.0'
implementation 'androidx.core:core-ktx:1.0.0'
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
testImplementation "junit:junit:4.12"
androidTestImplementation 'androidx.multidex:multidex-instrumentation:2.0.0'
androidTestImplementation 'androidx.test:runner:1.1.1'
androidTestImplementation 'androidx.test:rules:1.1.1'
androidTestImplementation 'androidx.test.uiautomator:uiautomator:2.2.0'
androidTestImplementation 'androidx.annotation:annotation:1.0.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}
日志：
2019-03-15 08:46:52.870 23474-23474/com.my.poroject E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.my.poroject, PID: 23474
java.lang.RuntimeException: Unable to get provider androidx.lifecycle.ProcessLifecycleOwnerInitializer: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.Application.registerActivityLifecycleCallbacks(android.app.Application$ActivityLifecycleCallbacks)' on a null object reference
at android.app.ActivityThread.installProvider(ActivityThread.java:6242)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:5805)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5722)
at android.app.ActivityThread.-wrap1(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1656)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.Application.registerActivityLifecycleCallbacks(android.app.Application$ActivityLifecycleCallbacks)' on a null object reference
at androidx.lifecycle.LifecycleDispatcher.init(LifecycleDispatcher.java:44)
at androidx.lifecycle.ProcessLifecycleOwnerInitializer.onCreate(ProcessLifecycleOwnerInitializer.java:36)
at android.content.ContentProvider.attachInfo(ContentProvider.java:1919)
at android.content.ContentProvider.attachInfo(ContentProvider.java:1894)
at android.app.ActivityThread.installProvider(ActivityThread.java:6239)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:5805)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5722)
at android.app.ActivityThread.-wrap1(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1656)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)