getResources() from static method, without context

问题:

I'm working on a SQLiteOpenHelper from which I'll read databases via static methods (since the databases are shared anyway). Is it possible to get the application context to something like:

public static final Context context = XXX;

It should be possible right? Since I'm obviously only calling from the current app and both resources and databases are shared inside the app.

To be clear: I want to access Resources and the SQLiteDatabases (if I happen to be wrong about the context approach).

Is it possible to achieve?

Edit: Is it possible to get the context from inside something like this (without passing it as a parameter)

public class foo{
    foo(){
        XXX.getResources();
    }
}

Edit2: Trying @britzl:s fist idea

public class SpendoBase extends Application{
private static Context context;
public SpendoBase(){
    System.out.println("SPENDOBASE: " + this);
    System.out.println("SPENDOBASE: " + this.getBaseContext());
}
public static Context getContext(){
    return this.context;
}

}

How do i get hold of the context? Either in the constructor or form the getContext();

Ps the getBaseContext() returns null, and getApplicationContext thows a nullPointerException.

回答1:

I see three possible solutions to your problem:

1. Create your own subclass of Application and set that as your application class in the manifest file. In your subclass you could have a static getInstance() method that would provide you with the application context (and thus Resources) from anywhere within your application. Example:

   public class BaseApplication extends Application {
   
       private static BaseApplication instance;
   
       public BaseApplication() {
           super();
           instance = this;
       }
   
       public static BaseApplication getInstance() {
           return instance;
       }
   }
   

   And in AndroidManifest.xml:

   <application android:name="com.example.BaseApplication" ...>
       ...activities
   </application>
   

2. Pass a context to any calls you make in your SQLiteOpenHelper

3. Inject the Resources instance using dependency injection