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android - Android 应用程序在启动时崩溃 (Kotlin)

问题描述

我是 Kotlin 的新手，我尝试为 Android 开发一个（非常）小测验，但是当我启动应用程序时，它崩溃了。我已经检查过了，但我没有看到任何错误。

这是我的代码的摘录。

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    Toast.makeText(applicationContext, "Welcome on Quizzer !.", Toast.LENGTH_SHORT).show()
    setLevel()
    checkAnswer()
}

这是我的完整代码：https ://pastebin.com/U6xtnC5c

日志猫：

2020-04-12 17:15:10.783 10645-10645/com.madijason.quizzer E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.madijason.quizzer, PID: 10645
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.madijason.quizzer/com.madijason.quizzer.MainActivity}: java.lang.ArrayIndexOutOfBoundsException: length=4; index=4
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
    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$H.handleMessage(ActivityThread.java:1808)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6669)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
 Caused by: java.lang.ArrayIndexOutOfBoundsException: length=4; index=4
    at com.madijason.quizzer.MainActivity.setLevel(MainActivity.kt:53)
    at com.madijason.quizzer.MainActivity.onCreate(MainActivity.kt:29)
    at android.app.Activity.performCreate(Activity.java:7136)
    at android.app.Activity.performCreate(Activity.java:7127)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048) 
    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$H.handleMessage(ActivityThread.java:1808) 
    at android.os.Handler.dispatchMessage(Handler.java:106) 
    at android.os.Looper.loop(Looper.java:193) 
    at android.app.ActivityThread.main(ActivityThread.java:6669) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

标签： androidkotlin

解决方案

Caused by: java.lang.ArrayIndexOutOfBoundsException: length=4; index=4

你得到ArrayIndexOutOfBoundsException. 您应该从 0 开始设置索引。

ArrayIndexOutOfBoundsException抛出表明我们正在尝试使用非法索引访问数组元素。

   first_answer.text = thirdQuestionAnswer[0]
   second_answer.text = thirdQuestionAnswer[1]
   third_answer.text = thirdQuestionAnswer[2]
   fourth_answer.text = thirdQuestionAnswer[3]

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