获取的NoClassDefFoundError:android.os.AsyncTask [英] Getting NoClassDefFoundError: android.os.AsyncTask
问题描述
这个问题已经困扰了我一下,我无法找到一个满意的解决方案。
在创作上的Android模拟器特定对象很多时候(并不总是)我得到的NoClassDefFoundError:android.os.AsynchTask
我已经尝试了许多方法删除并重新添加外部库多次,擦仿真器,重新启动的IntelliJ(过一次,但随后得到了同样的错误。)在这一点上所有我想要做的是建立最准系统的AsyncTask我仍然得到错误。
下面是整个错误消息:
08-06 16:24:43.546:ERROR / AndroidRuntime(331):致命异常:主要
java.lang.NoClassDefFoundError的:android.os.AsyncTask
在com.myapp.activity.StatisticsActivity.onCreate(StatisticsActivity.java:79)
在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
在android.app.ActivityThread.access $ 2300(ActivityThread.java:125)
在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:2033)
在android.os.Handler.dispatchMessage(Handler.java:99)
在android.os.Looper.loop(Looper.java:123)
在android.app.ActivityThread.main(ActivityThread.java:4627)
在java.lang.reflect.Method.invokeNative(本机方法)
在java.lang.reflect.Method.invoke(Method.java:521)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
在dalvik.system.NativeStart.main(本机方法)
模拟器运行2.2,我minSDK为8。这里是有问题的code:
公共类StatisticsActivity扩展TabActivity实现AsynchDataDisplay {
...
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.statistics);
StatisticsProvider SP =新StatisticsProvider();
...
}
}
而StatisticsProvider对象是:
私有类StatisticsProvider扩展AsyncTask的{
@覆盖
保护对象doInBackground(对象...对象){
返回null;
}
}
OK,看起来是与谷歌播放服务的版本中的一个问题。请参见的https://$c$c.google.com/ P /安卓/问题/详细信息?ID = 81083
看起来像周围的工作可能是添加:
尝试{
的Class.forName(android.os.AsyncTask);
}
捕获(的Throwable忽略){
//忽略
}
到应用#的onCreate()
如果您还没有一个应用程序类,然后创建一个从 android.app.Application
扩展的类以及
- 添加code以上到其
#onCreate()
- 添加引用您的应用程序类在AndroidManifest的应用元素。
<应用机器人:图标=@可绘制/ icon_game_launcher
机器人:标签=@字符串/ APP_NAME
机器人:名称=au.com.mycompany.myapp.MyApplication>
This problem has been bothering me for a bit and I cannot find a satisfactory solution.
Many times (not always) in the creation of a specific object on the Android emulator I get NoClassDefFoundError: android.os.AsynchTask.
I have tried many approaches removing and re-adding external libraries multiple times, wiping the emulator, restarting IntelliJ (worked once but then got the same error.) At this point all I am trying to do is construct the most barebones AsyncTask and I still get the error.
Here is the whole error message:
08-06 16:24:43.546: ERROR/AndroidRuntime(331): FATAL EXCEPTION: main
java.lang.NoClassDefFoundError: android.os.AsyncTask
at com.myapp.activity.StatisticsActivity.onCreate(StatisticsActivity.java:79)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
The emulator runs 2.2, my minSDK is 8. Here is the offending code:
public class StatisticsActivity extends TabActivity implements AsynchDataDisplay{
...
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.statistics);
StatisticsProvider sp = new StatisticsProvider();
...
}
}
And the StatisticsProvider object is:
private class StatisticsProvider extends AsyncTask{
@Override
protected Object doInBackground(Object... objects) {
return null;
}
}
OK, looks like it is a problem with one of the versions of Google play Services. See https://code.google.com/p/android/issues/detail?id=81083
Looks like a work around might be to add:
try {
Class.forName("android.os.AsyncTask");
}
catch(Throwable ignore) {
// ignored
}
into your Application#onCreate()
If you don't already have a Application class then create a class that extends from android.app.Application
and
- Add the code above into its
#onCreate()
- Add a reference to your application class in the application element of your AndroidManifest.
<application android:icon="@drawable/icon_game_launcher"
android:label="@string/app_name"
android:name="au.com.mycompany.myapp.MyApplication">
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