如何解决 ConcurrentModificationException

Question

更新应用程序后，我Firebase几乎在所有活动中都会出错。

Fatal Exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.project.app/com.project.app.MainActivity}: java.util.ConcurrentModificationException
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2895)
   at android.app.ActivityThread.-wrap11()
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1616)
   at android.os.Handler.dispatchMessage(Handler.java:106)
   at android.os.Looper.loop(Looper.java:176)
   at android.app.ActivityThread.main(ActivityThread.java:6651)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)

Caused by java.util.ConcurrentModificationException
   at androidx.collection.SimpleArrayMap.put(SimpleArrayMap.java:482)
   at com.google.android.gms.measurement.internal.zzin.zza(com.google.android.gms:play-services-measurement-impl@@17.2.2:108)
   at com.google.android.gms.measurement.internal.zzid.onActivityCreated(com.google.android.gms:play-services-measurement-impl@@17.2.2:11)
   at android.app.Application.dispatchActivityCreated(Application.java:199)
   at android.app.Activity.onCreate(Activity.java:1034)
   at androidx.core.app.ComponentActivity.onCreate(ComponentActivity.java:81)
   at androidx.activity.ComponentActivity.onCreate(ComponentActivity.java:149)
   at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:313)
   at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:106)
   at com.project.app.MainActivity.onCreate(MainActivity.java:74)
   at android.app.Activity.performCreate(Activity.java:7088)
   at android.app.Activity.performCreate(Activity.java:7079)
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1215)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2895)
   at android.app.ActivityThread.-wrap11()
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1616)
   at android.os.Handler.dispatchMessage(Handler.java:106)
   at android.os.Looper.loop(Looper.java:176)
   at android.app.ActivityThread.main(ActivityThread.java:6651)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)

我确定更改后出现问题build.gradle（模块：应用程序）。

这是build.gradle（旧版本）的一些行：

implementation 'com.google.android.material:material:1.2.0-alpha02'
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta3'
implementation 'com.android.billingclient:billing:2.0.3'
implementation 'com.google.firebase:firebase-ads:18.3.0'
implementation 'com.google.firebase:firebase-core:17.2.1'
implementation 'com.google.firebase:firebase-analytics:17.2.1'
implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'

这是build.gradle（新版本）的一些行：

implementation 'com.google.android.material:material:1.2.0-alpha04'
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta4'
implementation 'com.android.billingclient:billing:2.1.0'
implementation 'com.google.firebase:firebase-ads:18.3.0'
//implementation 'com.google.firebase:firebase-core:17.2.2'
implementation 'com.google.firebase:firebase-analytics:17.2.2'
implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'

我认为是由于 firebase-analytics:17.2.2，但我不确定。你觉得问题出在哪里？我需要降级到旧版本吗？

Answer 1

这是因为他们在版本 17.2.3 中修复了 firebase-core lib，请参阅更改日志：https : //firebase.google.com/support/release-notes/android#analytics_v17-2-3

改变你的

'com.google.firebase:firebase-core:17.2.1'

到

'com.google.firebase:firebase-core:17.2.3'