Question

我正在从一本名为“学习Android Studio：快速有效地构建Android应用程序”的书中学习Android Studio作者：Clifton Craig;亚当格柏。我正在学习如何构建Reminders应用程序并且无法加载应用程序的教程。在本教程中，我被指示使用本书中提供的内容更改onCreate（）方法，确保导入它们提供的内容。

提供了更改后的代码here。

logcat提供如下：

01-18 06:04:55.460 2212-2212/com.apress.gerber.reminders I/art: Not late-enabling -Xcheck:jni (already on)
01-18 06:04:55.800 2212-2212/com.apress.gerber.reminders W/System: ClassLoader referenced unknown path: /data/app/com.apress.gerber.reminders-2/lib/x86_64
01-18 06:04:55.960 2212-2212/com.apress.gerber.reminders D/AndroidRuntime: Shutting down VM
01-18 06:04:55.960 2212-2212/com.apress.gerber.reminders E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.apress.gerber.reminders, PID: 2212
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.apress.gerber.reminders/com.apress.gerber.reminders.RemindersActivity}: java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.ListView
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
       at android.app.ActivityThread.-wrap11(ActivityThread.java)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5417)
       at java.lang.reflect.Method.invoke(Native Method)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
    Caused by: java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.ListView
       at com.apress.gerber.reminders.RemindersActivity.onCreate(RemindersActivity.java:22)
       at android.app.Activity.performCreate(Activity.java:6237)
       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
       at android.app.ActivityThread.-wrap11(ActivityThread.java) 
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
       at android.os.Handler.dispatchMessage(Handler.java:102) 
       at android.os.Looper.loop(Looper.java:148) 
       at android.app.ActivityThread.main(ActivityThread.java:5417) 
       at java.lang.reflect.Method.invoke(Native Method) 
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
01-18 06:05:00.980 2212-2212/com.apress.gerber.reminders I/Process: Sending signal. PID: 2212 SIG: 9

该应用无法加载。模拟器出错。任何有关这方面的反馈将不胜感激。

提醒应用程序教程，app不加载，java文件问题

0 个答案: