[android] Raise event from plain class

imageview_adapter_interface.java

//source - by Rajeev - http://stackoverflow.com/a/20132526/1320686

//create an interface BtnClickListener
public interface BtnClickListener {
    public abstract void onBtnClick(int position, View v);
}

//on adapter pass the activity/fragment listener
private BtnClickListener mClickListener = null;
public ProfilAdapter(Context context, List<Customer> list, BtnClickListener listener) {
    mContext = context;
    mLayoutInflater = (LayoutInflater) mContext
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    list=lista;
    mClickListener = listener;
}

//Now you can simply set the normal onClickListener in getView()
holder.product_overflow = (ImageView) convertView.findViewById(R.id.frag_offer_product_overflow);
holder.product_overflow.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
    	 if(mClickListener != null)
    		 mClickListener.onBtnClick(item.getId(), v);  
    }
});

//on activity, when attaching the adapter to listview 
lstv_adapter = new ProfilAdapter(getActivity(), cust_list ,new Frag_Offer_Lstv_Settings() {

    @Override
    public void responseResult(int position, View v) {
		PopupMenu popupMenu = new PopupMenu(getActivity(),v);

		popupMenu.setOnMenuItemClickListener(new OnMenuItemClickListener() {

			@Override
			public boolean onMenuItemClick(MenuItem item) {
				switch (item.getItemId()) {
				case R.id.offer_menu_print:
					return true;
				case R.id.offer_menu_add_to_order:
					return true;
				default:
					return true;
				}
			}
		});

		popupMenu.inflate(R.menu.offer_menu);

		popupMenu.show();
    }

});

//source - by Rajeev - http://stackoverflow.com/a/20132526/1320686

raise_event_from_plain_class.java

//1-create an interface on separated class as :

import java.util.EventListener;


public interface post2socialInterface extends EventListener {
    public void responseResult(String val);
}


//2-at original class is like that :

public class post2social {

    // Used to communicate the result back to the Activity
    public post2socialInterface listener;
.
.
.


	//in a method raise the event like :
	listener.responseResult("Message posted on " + provider);
.
.
.


	//make the setListener on your own!
    public void setListener(post2socialInterface listener) {
        this.listener = listener;
    }

}




//then at activity
        post2social s = new post2social(Test.this, "", "", "", "", "", );

        s.setListener(new post2socialInterface() {


            @Override
            public void responseResult(String val) {
						final String tmp = val;

						runOnUiThread(new Runnable() {
							public void run() {
								if (progress != null)
									progress.dismiss();
								
									Toast.makeText(TestActivity.this,tmp, Toast.LENGTH_LONG).show();
							}
						});
            }

        });