Android Kotlin: RuntimeException: Unable to instantiate activity ComponentInfo{...}

本文介绍了一位开发者在使用Kotlin编写AndroidDemo时遇到的Crash问题及解决方案。问题在于未能正确加载Activity,原因是缺少必要的Gradle插件配置。通过在build.gradle文件中添加'kotlin-android'插件,解决了ClassNotFoundException错误。

今天想尝试一下kotlin写个Android Demo, 结果运行总是直接crash,报以下错:

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.***.demo/com.***.demo.android.**Activity}: java.lang.ClassNotFoundException: Didn't find class "***" on path: DexPathLis

 

查阅资料后发现是配置问题:

需要在build.gradle中加上一句:

apply plugin: 'kotlin-android'

 

 

 

08-16 23:31:59.743344 18223 18223 E AndroidRuntime: FATAL EXCEPTION: main Process: com.oplus.wallpapers, PID: 18223 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.oplus.wallpapers/com.oplus.wallpapers.themes.edit.ThemeEditActivity}: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.oplus.wallpapers.core.ability.wallpaperpicker.ChooseWallpaperPanel: could not find Fragment constructor at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4624) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4821) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:242) at android.app.servertransaction.TransactionExecutor.executeNonLifecycleItem(TransactionExecutor.java:138) at android.app.servertransaction.TransactionExecutor.executeTransactionItems(TransactionExecutor.java:108) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:85) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:3110) at android.os.Handler.dispatchMessage(Handler.java:115) at android.os.Looper.loopOnce(Looper.java:298) at android.os.Looper.loop(Looper.java:408) at android.app.ActivityThread.main(ActivityThread.java:9952) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:613) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1074) Caused by: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.oplus.wallpapers.core.ability.wallpaperpicker.ChooseWallpaperPanel: could not find Fragment constructor at androidx.fragment.app.Fragment.instantiate(SourceFile:9) at androidx.fragment.app.FragmentContainer.instantiate(Unknown Source:0) at androidx.fragment.app.FragmentManager$3.instantiate(Unknown Source:17) at androidx.fragment.app.FragmentStateManager.<init>(SourceFile:12) at androidx.fragment.app.FragmentManager.restoreSaveState(Unknown Source:108) at androidx.fragment.app.Fragment.restoreChildFragmentState(Unknown Source:12) at androidx.fragment.app.Fragment.onCreate(Unknown Source:3) at androidx.fragment.app.DialogFragment.onCreate(Unknown Source:0) at androidx.fragment.app.Fragment.performCreate(Unknown Source:26) at androidx.fragment.app.FragmentStateManager.create(Unknown Source:49) at androidx.fragment.app.FragmentStateManager.moveToExpectedState(Unknown Source:123) at androidx.fragment.app.FragmentStore.moveToExpectedState(Unknown Source:30) at androidx.fragment.app.FragmentManager.moveToState(SourceFile:57) at androidx.fragment.app.FragmentManager.dispatchStateChange(Unknown Source:9) at androidx.fragment.app.FragmentManager.dispatchCreate(Unknown Source:11) at androidx.fragment.app.FragmentController.dispatchCreate(Unknown Source:4) at androidx.fragment.app.FragmentActivity.onCreate(Unknown Source:12) at com.oplus.wallpapers.core.base.activity.BaseDefaultDensityActivity.onCreate(Unknown Source:0) at com.oplus.wallpapers.themes.edit.BaseThemeActivity.onCreate(Unknown Source:4) at com.oplus.wallpapers.themes.edit.ThemeEditActivity.onCreate(Unknown Source:0) at android.app.Activity.performCreate(Activity.java:9391) at android.app.Activity.performCreate(Activity.java:9363) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1541) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4598) ... 13 more Caused by: java.lang.NoSuchMethodException: com.oplus.wallpapers.core.ability.wallpaperpicker.ChooseWallpaperPanel.<init> [] at java.lang.Class.getConstructor0(Class.java:3385) at java.lang.Class.getConstructor(Class.java:2477) at androidx.fragment.app.Fragment.instantiate(SourceFile:5) ... 36 more
08-19
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