我不知道为什么应用程序会在应该转到下一个Activity
时崩溃。我制作了一个练习应用程序,使用相同的格式时可以正常工作。我将文件上传到gist.github。
错误
1216-1216/com.example.chiozokamalu.newfreshstart E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.ArrayIndexOutOfBoundsException
at com.example.chiozokamalu.newfreshstart.MainActivity.onClick(MainActivity.java:164)
at android.view.View.performClick(View.java:2485)
at android.view.View$PerformClick.run(View.java:9080)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
在MainActivity.java的第164行:
questionView.setText(questions[questionIndex]); // set the text to the next question
编辑:在Varun帮助我之后,我收到了一个新错误
1307-1307/com.example.chiozokamalu.newfreshstart E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.chiozokamalu.newfreshstart/com.example.chiozokamalu.newfreshstart.Results1}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.chiozokamalu.newfreshstart.Results1.onCreate(Results1.java:58)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分:2)
第一行的问题数组。 164超出界限意味着questionIndex大于问题数组的总长度。因此,在从数组中提取值之前,应该先检查长度。
您已添加了检查但在此之后您增加了值,因此您将if条件修改为if (questionIndex < questions.length -1)
或在if条件
之前修改questionIndex变量你遇到了问题,因为你还没有启动resultView9,这就是为什么它是null并给出nullpointer,只是初始化它就像你用其他做的一样,一切都很好。您已经初始化了resultView8两次,只需在那里添加resultview9