How to obtain AssetManager without reference to Context?
-
08-10-2019 - |
Question
I have a class that needs to obtain a reference to it's application's AssetManager
. This class does not extend any sort of android UI class, so it doesn't have a getContext()
method, or anything similar. Is there some sort of static Context.getCurrentApplicationContext()
type of method?
To clarify: my class is intended to be used like a library, for other applications. It has no associated AndroidManifest.xml
or control over the context which is calling it.
Solution
- Create a subclass of
Application
, for instancepublic class App extends Application {
- Set the
android:name
attribute of your<application>
tag in theAndroidManifest.xml
to point to your new class, e.g.android:name=".App"
- In the
onCreate()
method of your app instance, save your context (e.g.this
) to a static field namedapp
and create a static method that returns this field, e.g.getApp()
:
This is how it should look:
public class App extends Application{
private static Context mContext;
@Override
public void onCreate() {
super.onCreate();
mContext = this;
}
public static Context getContext(){
return mContext;
}
}
Now you can use: App.getContext()
whenever you want to get a context, and then getAssetManager()
(or App.getContext().getAssetManager()
).
OTHER TIPS
I am not sure of the best answer to the OP question. However, I do know that you have to be very careful when using a static context as suggested in Android developer resources:
In the
onCreate()
method of your app instance, save your context (e.g. this) to a static field named app and create a static method that returns this field, e.g.getApp()
:
Using static contexts can leak to leaked memory issues, especially if the static context is used for references to views.