当我运行我的应用程序时,每次我在logcat中获得以下异常时:
04-14 09:29:53.965: W/dalvikvm(1020): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
04-14 09:29:53.985: E/AndroidRuntime(1020): FATAL EXCEPTION: main
04-14 09:29:53.985: E/AndroidRuntime(1020): java.lang.RuntimeException: Unable to instantiate application android.app.Application: java.lang.NullPointerException
04-14 09:29:53.985: E/AndroidRuntime(1020): at android.app.LoadedApk.makeApplication(LoadedApk.java:482)
04-14 09:29:53.985: E/AndroidRuntime(1020): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3938)
04-14 09:29:53.985: E/AndroidRuntime(1020): at android.app.ActivityThread.access$1300(ActivityThread.java:123)
04-14 09:29:53.985: E/AndroidRuntime(1020): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1185)
04-14 09:29:53.985: E/AndroidRuntime(1020): at android.os.Handler.dispatchMessage(Handler.java:99)
04-14 09:29:53.985: E/AndroidRuntime(1020): at android.os.Looper.loop(Looper.java:137)
04-14 09:29:53.985: E/AndroidRuntime(1020): at android.app.ActivityThread.main(ActivityThread.java:4424)
04-14 09:29:53.985: E/AndroidRuntime(1020): at java.lang.reflect.Method.invokeNative(Native Method)
04-14 09:29:53.985: E/AndroidRuntime(1020): at java.lang.reflect.Method.invoke(Method.java:511)
04-14 09:29:53.985: E/AndroidRuntime(1020): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-14 09:29:53.985: …我在Android世界中是一个菜鸟,做一个锻炼的宠物项目.这是一个非常简单的类似提醒的应用程序,只有两个活动.一个是定制的ListView显示现有的警报.其中有一些按钮用于启动另一个按钮,用于添加/编辑警报.它中有一个按钮导致之前的ListView活动.
我最近遇到了一个奇怪的情况.我的应用运行正常.但问题是,每当我触发添加/编辑活动,然后返回到ListView,然后重新运行(或者我应该说重新安装？)应用程序.将弹出一条错误消息.但它只会短暂显示,应用程序将启动.
我在日志中收到的错误消息说:
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to instantiate application android.app.Application: java.lang.NullPointerException
at android.app.LoadedApk.makeApplication(LoadedApk.java:482)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3909)
at android.app.ActivityThread.access$1300(ActivityThread.java:122)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1184)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4340)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.app.LoadedApk.initializeJavaContextClassLoader(LoadedApk.java:362)
at android.app.LoadedApk.getClassLoader(LoadedApk.java:305)
at android.app.LoadedApk.makeApplication(LoadedApk.java:474)
... 11 more
它没有明确指出我的代码中的错误.所以我不知道如何纠正它.有没有人遇到类似的问题？任何建议将不胜感激!
以下是添加/编辑活动的代码:
public class EditEntry extends Activity
{
private AutoCompleteTextView foodNameTextView;
private DatePicker datePicker;
// store values in AutoCompleteTextView & DatePicker
private String foodName;
private Calendar foodDate;
@Override
protected …