文章目錄

• 一、報錯信息
• 二、解決方案

一、報錯信息

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使用環境 :

• Kotlin 編寫的 Activity
• 使用了 kotlin-android-extensions 擴展插件 , 在 build.gradle 中配置的 apply plugin: 'kotlin-android-extensions' ;
• 在 Activity 界面中使用了 var texts: Array<TextView> = arrayOf(text0, text1) 代碼 ;

2021-03-26 11:30:49.653 8620-8620/cn.hsl.example E/AndroidRuntime: FATAL EXCEPTION: mainProcess: cn.hsl.example, PID: 8620java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{cn.hsl.example/cn.hsl.example.xxxActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object referenceat android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2881)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086)at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)at android.os.Handler.dispatchMessage(Handler.java:106)at android.os.Looper.loop(Looper.java:193)at android.app.ActivityThread.main(ActivityThread.java:6718)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object referenceat android.support.v7.app.AppCompatDelegateImplBase.<init>(AppCompatDelegateImplBase.java:120)at android.support.v7.app.AppCompatDelegateImplV9.<init>(AppCompatDelegateImplV9.java:155)at android.support.v7.app.AppCompatDelegateImplV11.<init>(AppCompatDelegateImplV11.java:31)at android.support.v7.app.AppCompatDelegateImplV14.<init>(AppCompatDelegateImplV14.java:55)at android.support.v7.app.AppCompatDelegateImplV23.<init>(AppCompatDelegateImplV23.java:33)at android.support.v7.app.AppCompatDelegateImplN.<init>(AppCompatDelegateImplN.java:33)at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:201)at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:185)at android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:519)at android.support.v7.app.AppCompatActivity.findViewById(AppCompatActivity.java:190)at cn.hsl.example.xxxActivity._$_findCachedViewById(Unknown Source:25)at cn.hsl.example.xxxActivity.<init>(ReactionDrumActivity.kt:47)at java.lang.Class.newInstance(Native Method)at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:69)at android.app.Instrumentation.newActivity(Instrumentation.java:1215)at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2869)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6718) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 2021-03-26 11:30:49.654 8620-8620/cn.hsl.example E/DEBUG: begin to generate java report 2021-03-26 11:30:49.659 8620-8620/cn.hsl.example E/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** 2021-03-26 11:30:49.661 8620-8620/cn.hsl.example E/DEBUG: Basic Information: 'pid: 8620/tid: 8620/time: 20210326113049' 2021-03-26 11:30:49.662 8620-8620/cn.hsl.example E/DEBUG: Cpu Information: 'abi: arm64-v8a,armeabi-v7a,armeabi/processor: AArch64 Processor rev 1 (aarch64)/hardware: Qualcomm Technologies, Inc MSM8998' 2021-03-26 11:30:49.662 8620-8620/cn.hsl.example E/DEBUG: Mobile Information: 'model: Pixel 2/version: 9/sdk: 28' 2021-03-26 11:30:49.662 8620-8620/cn.hsl.example E/DEBUG: Build fingerprint: 'google/walleye/walleye:9/PQ3A.190801.002/5670241:user/release-keys' 2021-03-26 11:30:49.664 8620-8620/cn.hsl.example E/DEBUG: Runtime Information: 'start: 20210326113042/maxheap: 201326592/primaryabi: arm64-v8a/ground: bg' 2021-03-26 11:30:49.665 8620-8620/cn.hsl.example E/DEBUG: Application Information: 'version: 0.1/subversion: release/buildseq: d79b3587/versioncode: 1' 2021-03-26 11:30:49.665 8620-8620/cn.hsl.example E/DEBUG: CrashSDK Information: 'version: 3.2.0.4/nativeseq: 0/javaseq: 200403192109/arch: /target: umeng' 2021-03-26 11:30:49.666 8620-8620/cn.hsl.example E/DEBUG: Report Name: 5f3cf3dfd3093221547aec89_0.1_d79b3587_Pixel-2_9_161672944965535295_20210326113049_bg_ucebujava.log 2021-03-26 11:30:49.666 8620-8620/cn.hsl.example E/DEBUG: UUID: 1affcaf9-c824-4c86-acfe-80132e09c1fb 2021-03-26 11:30:49.667 8620-8620/cn.hsl.example E/DEBUG: Log Type: ucebujava 2021-03-26 11:30:49.667 8620-8620/cn.hsl.example E/DEBUG: Activity: (none) 2021-03-26 11:30:49.667 8620-8620/cn.hsl.example E/DEBUG: --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- 2021-03-26 11:30:49.667 8620-8620/cn.hsl.example E/DEBUG: um_app_key: 5f3cf3dfd3093221547aec89 2021-03-26 11:30:49.667 8620-8620/cn.hsl.example E/DEBUG: um_app_channel: Umeng 2021-03-26 11:30:49.667 8620-8620/cn.hsl.example E/DEBUG: um_os: android 2021-03-26 11:30:49.668 8620-8620/cn.hsl.example E/DEBUG: um_crash_sdk_version: v0.0.5 2021-03-26 11:30:49.668 8620-8620/cn.hsl.example E/DEBUG: um_umid_header: ai3406fbd3ecf72697d53b52606d7202ee 2021-03-26 11:30:49.668 8620-8620/cn.hsl.example E/DEBUG: --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- 2021-03-26 11:30:49.668 8620-8620/cn.hsl.example E/DEBUG: Process Name: 'cn.hsl.example' 2021-03-26 11:30:49.668 8620-8620/cn.hsl.example E/DEBUG: Thread Name: 'main' 2021-03-26 11:30:49.668 8620-8620/cn.hsl.example E/DEBUG: Back traces starts. 2021-03-26 11:30:49.668 8620-8620/cn.hsl.example W/cn.hsl.example: Accessing hidden field Ljava/lang/Throwable;->detailMessage:Ljava/lang/String; (light greylist, reflection) 2021-03-26 11:30:49.669 8620-8620/cn.hsl.example E/DEBUG: java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{cn.hsl.example/cn.hsl.example.xxxActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference 2021-03-26 11:30:49.670 8620-8620/cn.hsl.example E/DEBUG: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2881) 2021-03-26 11:30:49.670 8620-8620/cn.hsl.example E/DEBUG: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086) 2021-03-26 11:30:49.670 8620-8620/cn.hsl.example E/DEBUG: at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 2021-03-26 11:30:49.670 8620-8620/cn.hsl.example E/DEBUG: at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 2021-03-26 11:30:49.670 8620-8620/cn.hsl.example E/DEBUG: at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 2021-03-26 11:30:49.671 8620-8620/cn.hsl.example E/DEBUG: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816) 2021-03-26 11:30:49.671 8620-8620/cn.hsl.example E/DEBUG: at android.os.Handler.dispatchMessage(Handler.java:106) 2021-03-26 11:30:49.671 8620-8620/cn.hsl.example E/DEBUG: at android.os.Looper.loop(Looper.java:193) 2021-03-26 11:30:49.671 8620-8620/cn.hsl.example E/DEBUG: at android.app.ActivityThread.main(ActivityThread.java:6718) 2021-03-26 11:30:49.671 8620-8620/cn.hsl.example E/DEBUG: at java.lang.reflect.Method.invoke(Native Method) 2021-03-26 11:30:49.672 8620-8620/cn.hsl.example E/DEBUG: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 2021-03-26 11:30:49.672 8620-8620/cn.hsl.example E/DEBUG: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 2021-03-26 11:30:49.672 8620-8620/cn.hsl.example E/DEBUG: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference 2021-03-26 11:30:49.672 8620-8620/cn.hsl.example E/DEBUG: at android.support.v7.app.AppCompatDelegateImplBase.<init>(AppCompatDelegateImplBase.java:120) 2021-03-26 11:30:49.673 8620-8620/cn.hsl.example E/DEBUG: at android.support.v7.app.AppCompatDelegateImplV9.<init>(AppCompatDelegateImplV9.java:155) 2021-03-26 11:30:49.673 8620-8620/cn.hsl.example E/DEBUG: at android.support.v7.app.AppCompatDelegateImplV11.<init>(AppCompatDelegateImplV11.java:31) 2021-03-26 11:30:49.673 8620-8620/cn.hsl.example E/DEBUG: at android.support.v7.app.AppCompatDelegateImplV14.<init>(AppCompatDelegateImplV14.java:55) 2021-03-26 11:30:49.673 8620-8620/cn.hsl.example E/DEBUG: at android.support.v7.app.AppCompatDelegateImplV23.<init>(AppCompatDelegateImplV23.java:33) 2021-03-26 11:30:49.673 8620-8620/cn.hsl.example E/DEBUG: at android.support.v7.app.AppCompatDelegateImplN.<init>(AppCompatDelegateImplN.java:33) 2021-03-26 11:30:49.674 8620-8620/cn.hsl.example E/DEBUG: at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:201) 2021-03-26 11:30:49.674 8620-8620/cn.hsl.example E/DEBUG: at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:185) 2021-03-26 11:30:49.674 8620-8620/cn.hsl.example E/DEBUG: at android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:519) 2021-03-26 11:30:49.674 8620-8620/cn.hsl.example E/DEBUG: at android.support.v7.app.AppCompatActivity.findViewById(AppCompatActivity.java:190) 2021-03-26 11:30:49.674 8620-8620/cn.hsl.example E/DEBUG: at cn.hsl.example.xxxActivity._$_findCachedViewById(Unknown Source:25) 2021-03-26 11:30:49.675 8620-8620/cn.hsl.example E/DEBUG: at cn.hsl.example.xxxActivity.<init>(ReactionDrumActivity.kt:47) 2021-03-26 11:30:49.675 8620-8620/cn.hsl.example E/DEBUG: at java.lang.Class.newInstance(Native Method) 2021-03-26 11:30:49.675 8620-8620/cn.hsl.example E/DEBUG: at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:69) 2021-03-26 11:30:49.675 8620-8620/cn.hsl.example E/DEBUG: at android.app.Instrumentation.newActivity(Instrumentation.java:1215) 2021-03-26 11:30:49.675 8620-8620/cn.hsl.example E/DEBUG: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2869) 2021-03-26 11:30:49.676 8620-8620/cn.hsl.example E/DEBUG: ... 11 more 2021-03-26 11:30:49.676 8620-8620/cn.hsl.example E/DEBUG: Back traces ends. 2021-03-26 11:30:49.676 8620-8620/cn.hsl.example E/DEBUG: --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- 2021-03-26 11:30:49.676 8620-8620/cn.hsl.example E/DEBUG: meminfo: 2021-03-26 11:30:49.676 8620-8620/cn.hsl.example E/DEBUG: MemTotal: 3744240 kBMemFree: 49476 kBMemAvailable: 1212412 kBBuffers: 11908 kBCached: 1305404 kBSwapCached: 8600 kBActive: 1594884 kBInactive: 960020 kBActive(anon): 1010644 kBInactive(anon): 375444 kBActive(file): 584240 kBInactive(file): 584576 kBUnevictable: 146832 kBMlocked: 146832 kB

二、解決方案

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上述錯誤就是在 setContentView(R.layout.xxx) 之前調用 findViewById 導致的錯誤 ;

在 var texts: Array<TextView> = arrayOf(text0, text1) 代碼中的 text0 是布局中的 R.id.text0 組件 , 該位置實際上是調用了 (TextView)findViewById(R.id.text0) 方法 , 但是調用該方法的前提是已經設置了布局 ;

修改方案 :

① 成員變量中不進行賦值 , 使用延遲加載 , lateinit var texts: Array<TextView> ;

② 在 onCreate 方法中 setContentView 方法之后再進行賦值 ;

override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.xxx)texts = arrayOf(text0, text1)}

總結

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