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Android: NoClassDefFoundError for some app users

I published the application 2 months ago, and sometimes I get some errors from users.

Here is the log:

java.lang.NoClassDefFoundError: android.os.StrictMode$ThreadPolicy$Builder at mdpi.android.MDPIActivity.onCreate(MDPIActivity.java:132) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) at android.app.ActivityThread.access$2300(ActivityThread.java:125) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:123) at android.app.ActivityThread.main(ActivityThread.java:4627) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:521) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:871) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629) at dalvik.system.NativeStart.main(Native Method)

The strange thing is that when testing I am a newbie getting this error, and at the moment there are 6 reports from other users about this problem.

Here is my manifest:

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="mdpi.android" android:versionCode="4" android:versionName="2.1" android:installLocation="auto"> <uses-sdk android:minSdkVersion="8" /> <application android:icon="@drawable/app_icon" android:label="@string/app_name" android:theme="@android:style/Theme.Black"> android:debuggable=false <activity android:name=".WelcomeScreen" android:configChanges="orientation|keyboardHidden" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".MDPIActivity" android:configChanges="keyboardHidden|orientation"></activity> <activity android:name=".UserSubmission" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".UserProfile" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".UserInformations" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".UserForgotPassword" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".UserRegistration" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".UserSubmissions" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".UserSubmissionLog" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".UserEmailNotifications"></activity> <activity android:name=".Journals" android:configChanges="keyboardHidden|orientation"></activity> <activity android:name=".JournalsAdding" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".JournalAimsAndScope" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".JournalEditorialBoard" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".JournalContact" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".JournalArticles" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".JournalArticleInfo" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".JournalArticlesVolumeIssuesSelection"></activity> <activity android:name=".MDPI_About" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".MDPI_About_About" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".MDPI_About_Contact" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".User_Registration_Country_Choosing"></activity> <activity android:name=".MDPI_About_OpenAccess" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".UserLoging" android:configChanges="keyboardHidden|orientation"></activity> <activity android:name=".JournalSelectingDialog" android:theme="@android:style/Theme.Dialog" android:configChanges="orientation|keyboardHidden"></activity> <activity android:name=".UserProfileEditing" android:configChanges="orientation|keyboardHidden" android:windowSoftInputMode="stateHidden"></activity> <activity android:name=".User_EditProfile_Country_Choosing" android:configChanges="orientation|keyboardHidden"> </activity> <activity android:name=".JournalsDeleting" android:configChanges="orientation|keyboardHidden"> </activity> <activity android:name=".Highlights" android:configChanges="orientation|keyboardHidden"> </activity> <activity android:name=".Highlights_News" android:configChanges="orientation|keyboardHidden"> </activity> <activity android:name=".Highlights_News_Informations" android:configChanges="orientation|keyboardHidden"> </activity> <activity android:name=".Highlights_NewSpecialIssues" android:configChanges="orientation|keyboardHidden"> </activity> <activity android:name=".Highlights_NewSpecialIssue_Informations" android:configChanges="orientation|keyboardHidden"> </activity> <activity android:name=".Search" android:configChanges="orientation|keyboardHidden"> <intent-filter> <action android:name="android.intent.action.SEARCH" /> </intent-filter> <meta-data android:name="android.app.searchable" android:resource="@xml/searchable"/> </activity> <activity android:name=".SearchInterface" android:configChanges="orientation|keyboardHidden"> <meta-data android:name="android.app.default_searchable" android:value=".Search" /> </activity> <activity android:name=".SpecialIssueInformations" android:configChanges="orientation|keyboardHidden"> </activity> <activity android:name=".ArticlesFromAuthor" android:configChanges="orientation|keyboardHidden"> </activity> <activity android:name=".ChangeWallpaper" android:configChanges="orientation|keyboardHidden"> </activity> </application> <uses-permission android:name="android.permission.INTERNET"></uses-permission> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

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2 answers

Strict mode was introduced at API level 9, and in the manifest you have 8 installed at a minimum. This is probably from users running 2.2.x (API level 8).

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In Android below Gingerbread (API 9), StrictMode does not exist. Therefore, when importing a library or using code, StrictMode Activity throws an exception.

Perhaps this works when using the following methods (in PseudoCode):

In action

 if(9 >= android.os.Build.VERSION.SDK_INT){ StrictModeHelper.disable(); }

external class (only here the strictmode lib file is imported)

 class StrictModeHelper{ public static disable(){ // do disable strict mode stuff } }
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Source: https://habr.com/ru/post/1434795/

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