Can I set onClickListener to another class ? (Android, Java)

[LNU1]

There are two classes:
- ListViewActivity extends Activity,
- MyAdapter extends BaseAdapter.
MyAdapter overrides the getView method and creates an item in ListView, which drawn in ListViewActivity.
I want to call setOnClickListener in MyAdapter.getView, but the listener must be placed in another class - not in MyAdapter.

Standard approach is:

        MyAdapter.getView ... {
            Button button_del = (Button) view.findViewById(R.id.button_del);     
            button_del.setOnClickListener(this);
        }   

It is not applicable for me because requires declaring the listener in MyAdapter class.

QUESTION - Can the setOnClickListener refer to the listener in another class ?

PS: button_del.setOnClickListener(ListViewActivity) does not work !

[AleMonteiro]

It's not important in wich class your listener is, what's important is in wich context it'll run.

This is not exactly what you are doing, in part because I didn't understand it all, but this may help...

class Parent extends Activity
{
    public Button btnTest;
    public Child objChild;

    void onCreate() {
        btnTest = findView..

        objChild = new Child();

        // Any of the tree options should work

        btnTest.setOnClickListener(myClick) // Parent Listener
        btnTest.setOnClickListener(objChild.myClick); // Child Listener
        btnTest.setOnClickListener(AnotherStatic.myClick); Static Click

    }

    OnClickListener myClick = new OnClickListener() { ... }
}

class Child 
{
    public OnClickListener myClick = new OnClickListener() { ... }
}

class AnotherStatic
{
    public static OnClickListener myClick = new OnClickListener() { ... }
}

The other way is also true, if you have the button property is public, any class with access to it could set the listener.

[raj.mscking]

Hi!

As Mr.AleMonteiro said you can use the object reference..,

Otherwise simply you may customise your Adapter class to reach your goal..,

please copy your exact code for more information..,

[LNU1]

-

My goal is to implement all click listeners in 1 class - ListViewActivity, but installing the listeners may occurs in this class or in another - MyAdapter.
But I tried to set listener without creating "new OnClickListener()", as Mr.AleMonteiro has proposed. It is wrong syntax (a line marked with "++++") ?

Example:

    public class MyAdapter extends BaseAdapter implements OnClickListener  {
            ListViewActivity ctx;
            LayoutInflater lInflater;
            ArrayList<Web_site> sites;   // локальная копия списка сайтов специально для адаптера

            MyAdapter(ListViewActivity context, ArrayList<Web_site> _sites) {
                ctx = context;
                sites = _sites;
                lInflater = (LayoutInflater) ctx
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            }

            ...

                    @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                // используем созданные, но не используемые view
                View view = convertView;
                if (view == null) {
                    view = lInflater.inflate(R.layout.one_line, parent, false);
                }

                Web_site p = get_site(position);


                ((TextView) view.findViewById(R.id.l_url)).setText(p.url);

                String stat = Integer.toString(p.content.length()) + "=";
                if (p.is_locked()) {stat = stat + "L";};
                ((TextView) view.findViewById(R.id.l_text)).setText(stat);
                Log.d("XXX", "updating pos = "+ Integer.toString(position) + "  cont.len = " + Integer.toString(p.content.length()));

                Button button_del = (Button) view.findViewById(R.id.button_del);    
                button_del.setOnClickListener(this);
                // ++++ ^ I want to set the listener to ctx.onClick (not to "this"); but button_del.setOnClickListener(ctx.onClick) generates syntax error  ++++

                return view;
            }

                @Override
            public void onClick(View v) {

                switch(v.getId()){
                ...
                }

            }  
        }

        public class ListViewActivity extends Activity implements OnClickListener {

        MyAdapter my_adapter;
        ListView lvMain;
        WebView my_web;

        @Override
        protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_list_view);

            MyApplication app = (MyApplication) getApplication();

            my_adapter = new MyAdapter(this, app.sites);

            lvMain = (ListView) findViewById(R.id.lvMain);
            lvMain.setAdapter(my_adapter);

            Log.d("XXX", "setting on click listener for LOAD");

            ...
        }



    // ++++ all clicks must be processed here ++++
    @Override
    public void onClick(View v) {
        MyApplication app;

        switch(v.getId()){

        ...
        }

    }  


}

[AleMonteiro]

LNU1, ListViewActivity onClick is not an OnClickListener object, it's an method.

On ListViewActivity, create a listener like

public OnClickListener myClick = new OnClickListener() {
    ...
};

And then use ctx.myClick

[LNU1]

Thanks for all !!!