我一直在存储多数民众赞成需要整个活动在我的Andr​​oid应用程序使用android.app.Application的子类，由Soonil的解释（中的 Android的：？如何声明全局变量）

该方法是这样的：

 类MyApp的扩展应用{

    私人字符串myState;

    公共字符串的getState（）{
    返回myState;
    }
        公共无效的setState（String s）将{
        myState =秒;
    }
}

类胡说延伸活动{

    @覆盖
    公共无效的onCreate（包B）{
    ...
    的MyApp appState =（（MyApp的）getApplicationContext（））;
    字符串状态= appState.getState（）;
    ...
    }
}
 

到现在为止，这种方法已经从我的任何活动访问全局变量工作的罚款。但是用同样的方法在今天，我得到了以下错误：

 无法使静态引用非静态方法getApplicationContext（）
从类型ContextWrapper
 

从之前的主要区别是，新的活动实际上是一个片段（SherlockFragmentActivity，为precise）。

任何想法，为什么我不能访问appState，因为我有过，而且是有没有好的解决办法？

非常感谢。

编辑：好抓，马特B.它原来的地方，我实际调用getApplicationContext（）是另外一个类的内部。这里的调用点：

 公共类MyActivity扩展SherlockFragmentActivity {
    公共静态类AccountListFragment扩展SherlockListFragment {
        的MyApp appState =（（MyApp的）getApplicationContext（））;
        ...
    }
    ...
}
 

另外，如下所述，错误走了，当我改变调用

  MyApp的appState =（（MyApp的）getActivity（）getApplicationContext（））;
 

解决方案

  getActivity（）。getApplication（）
 

应该只是罚款。

您首先需要提及的活动，再到应用程序

不同的是，你现在从一个片段调用这个函数（即使你把它命名为活动），而不是一个活动

I have been storing a global variable that's needed across Activities in my Android app by using a subclass of android.app.Application as explained by Soonil (in Android: How to declare global variables?).

The approach looks like this:

class MyApp extends Application {

    private String myState;

    public String getState(){
    return myState;
    }
        public void setState(String s){
        myState = s;
    }
}

class Blah extends Activity {

    @Override
    public void onCreate(Bundle b){
    ...
    MyApp appState = ((MyApp)getApplicationContext());
    String state = appState.getState();
    ...
    }
}

Up to this point, this approach has worked fine for accessing the global variable from any of my Activities. But today using the same approach, I got the following error:

Cannot make a static reference to the non-static method getApplicationContext()
from the type ContextWrapper

The key difference from before is that the new Activity is actually a Fragment (SherlockFragmentActivity, to be precise).

Any ideas why can't I access appState as I have before, and is there a good workaround?

Many thanks.

EDIT: Good catch, Matt B. It turns out the place I'm actually calling getApplicationContext() is inside another class. Here's the calling point:

public class MyActivity extends SherlockFragmentActivity {
    public static class AccountListFragment extends SherlockListFragment {
        MyApp appState = ((MyApp)getApplicationContext());
        ...
    }
    ...
}

Also, as noted below, the error went away when I changed the call to

MyApp appState = ((MyApp)getActivity().getApplicationContext());

getActivity().getApplication() 

should work just fine.

You first need a reference to activity, then to application

The difference is that you are now calling this function from a Fragment (even though you named it "Activity") instead of an Activity