问题
I'm using retrofit with okhttp and migrated to AndroidX, When I make a signed app that obfuscated with proguard it crashes and gives an error,but in debug mode when proguard is not enabled it's working good. and I disabled proguard just for testing and made a signed APK it's working this way too. so I'm sure the crash is caused by Proguard. And I did some search on google they all say that I have to add proguard rules for both OKHTTP and Retrofit I did add them too but it still crashes. The error is logged from Crashlytics because I didn't enable proguard in debug mode:
PagedStorage.java line 118
androidx.paging.PagedStorage.init
Fatal Exception: java.lang.NullPointerException
Attempt to invoke interface method 'int java.util.List.size()' on a null object reference
androidx.paging.PagedStorage.init (PagedStorage.java:118)
androidx.paging.PagedStorage.init (PagedStorage.java:131)
androidx.paging.ContiguousPagedList$1.onPageResult (ContiguousPagedList.java:81)
androidx.paging.DataSource$LoadCallbackHelper$1.run (DataSource.java:324)
android.os.Handler.handleCallback (Handler.java:790)
android.os.Handler.dispatchMessage (Handler.java:99)
android.os.Looper.loop (Looper.java:164)
android.app.ActivityThread.main (ActivityThread.java:7000)
java.lang.reflect.Method.invoke (Method.java)
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:441)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1408)
Thread-20
java.lang.Object.wait (Object.java)
java.lang.Thread.parkFor$ (Thread.java:2137)
sun.misc.Unsafe.park (Unsafe.java:358)
java.util.concurrent.locks.LockSupport.park (LockSupport.java:190)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await (AbstractQueuedSynchronizer.java:2059)
java.util.concurrent.PriorityBlockingQueue.take (PriorityBlockingQueue.java:548)
com.android.volley.NetworkDispatcher.processRequest (NetworkDispatcher.java:104)
com.android.volley.NetworkDispatcher.run (Network
Dispatcher.java:87)
And that's my Proguard rules:
-dontwarn org.conscrypt.OpenSSLProvider
-dontwarn org.conscrypt.Conscrypt
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
-keepattributes *Annotation*
-keepattributes SourceFile,LineNumberTable
-keep public class * extends java.lang.Exception
-keep class com.crashlytics.** { *; }
-dontwarn com.crashlytics.**
# Retrofit does reflection on generic parameters. InnerClasses is required to use Signature and
# EnclosingMethod is required to use InnerClasses.
-keepattributes Signature, InnerClasses, EnclosingMethod
# Retain service method parameters when optimizing.
-keepclassmembers,allowshrinking,allowobfuscation interface * {
@retrofit2.http.* <methods>;
}
# Ignore annotation used for build tooling.
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
# Ignore JSR 305 annotations for embedding nullability information.
-dontwarn javax.annotation.**
# Guarded by a NoClassDefFoundError try/catch and only used when on the classpath.
-dontwarn kotlin.Unit
# Top-level functions that can only be used by Kotlin.
-dontwarn retrofit2.-KotlinExtensions
# JSR 305 annotations are for embedding nullability information.
-dontwarn javax.annotation.**
# A resource is loaded with a relative path so the package of this class must be preserved.
-keepnames class okhttp3.internal.publicsuffix.PublicSuffixDatabase
# Animal Sniffer compileOnly dependency to ensure APIs are compatible with older versions of Java.
-dontwarn org.codehaus.mojo.animal_sniffer.*
# OkHttp platform used only on JVM and when Conscrypt dependency is available.
-dontwarn okhttp3.internal.platform.ConscryptPlatform
-keep class com.google.android.material.** { *; }
-dontwarn com.google.android.material.**
-dontnote com.google.android.material.**
this part added after the crash but it's still useless
-dontwarn androidx.**
-keep class androidx.** { *; }
-keep interface androidx.** { *; }
-keep class androidx.paging.PagedStorage.init
来源：https://stackoverflow.com/questions/53584152/androidx-paging-pagedstorage-init-is-giving-error-when-proguard-is-enabled