Pass an interface from class to activity

Question

If i have an object form interface in my class, how i can pass it to activity?

My solution was to change it as static object, it's work fine but sometimes it create a memory leaks because of all the old references which the garbage collector cannot collect, and i cannot implement 'Serializable' on my interface.

public class MyClass {
     protected OnStringSetListener onstringPicked;
        public interface OnStringSetListener {
            void OnStringSet(String path);

        }
    //......//
      public void startActivity(){
                Intent intent=new Intent(context,Secound.class);
                // ?! intent.putExtra("TAG", inter);
                context.startActivity(intent);
      }
}

Use `Parcelable`.. It is built for Android..:) – Chintan Soni Feb 15 '16 at 08:49 — Chintan Soni, Feb 15 '16 at 08:49

score 0 · Answer 1 · edited May 23 '17 at 11:59

0

Passing in custom objects is a little more complicated. You could just mark the class as Serializable and let Java take care of this. However, on the android, there is a serious performance hit that comes with using Serializable. The solution is to use Parcelable.

Extra info

edited May 23 '17 at 11:59

Community

1
1

answered Feb 15 '16 at 08:32

Ahmad Aghazadeh

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score 0 · Accepted Answer · answered Feb 15 '16 at 08:41

In my opinion, using Bundles would be a nice choice. Actually bundles internally use Parcelables. So, this approach would be a good way to go with.

Suppose you would like to pass an object of type class MyClass to another Activity, all you need is adding two methods for compressing/uncompressing to/from a bundle.

To Bundle:

public Bundle toBundle(){
    Bundle bundle = new Bundle();
    // Add the class properties to the bundle
    return bundle;
}

From Bundle:

public static MyClass fromBundle(Bundle bundle){
    MyClass obj = new MyClass();
    // populate properties here
    return obj;
}

Note: Then you can simply pass bundles to another activities using putExtra. Note that handling bundles is much simpler than Parcelables.

Pass an interface from class to activity

2 Answers2