How to use assets in Android

How do one use assets? I have this code:

AssetManager assets = getAssets();
InputStream开发者_如何转开发 stream = assets.open( "test.txt" );

It seams like it can only by used in an Activity class. If I try to use the above code in another class I get an error about getAssets() is not a type for my class.

So how do one use assets in a class that is not an Activity?

You have to pass that class you want to use your activity's context. To get the correct context in you activity you do something like this.

private Context ctx = null;

public void onCreate(Bundle bundle) {
    super.onCreate(bundle);
    // your other code
    ctx = getApplication();

    MyClass myClass = new MyClass(ctx);
}

Where MyClass is the class you are talking about. In your class you have to handle the context to in your classes constructor.

class MyClass {
    Context ctx = null;

    public MyClass(Context ctx) {
        this.ctx = ctx;
    }
}