CODEWITHSUNDEEP
androidlistviewandroid-listview
user755
user755

Reputation: 2661

Handling listview item children click events and updates

I have activity which populates listview with customadpater. The Adapter inflates a layout which contains(buttons, textview,seekbar...)

I want the buttons click listeners, updating textview and seekbar thumb to be handled in actvity not inside the getView() method of adapter.

my activity and adapter are different classes. I need a employ a proper design here any help please.

Upvotes: 0

Views: 1389

Answers (2)

thepoosh
thepoosh

Reputation: 12587

the best design for implementing this is to do what was suggested by @Autocrab and the code to do this is like this:

public class ParentClass implements View.onClickListener {

    public void onCreate(Bundle savedInstanceState) {
        MyAdapter mAdapter = new MyAdapter(this, list);
        // MORE AND MORE AND MORE
    }

public class MyAdapter {

    onClickListener mListener;

    public MyAdapter (ParentClass activity, List<?> list) {
        mListener = (onClickListener)activity;
        // MORE AND MORE
    }

    public View getView(...) {
        lButton.setOnClickListener(mListener);
    }
}

the only problem with code like that is cyclic refrencing that should be avoided in all coast.

there for, you should probably use WeakRefrences.

when using a WeakReference it's very important to check every time before getting it that it's not null, like this:

public class MyAdapter {

    WeakReference<OnClickListener> mListener;

    public MyAdapter (ParentClass activity, List<?> list) {
        mListener = new WeakReference<OnClickListener>(onClickListener)activity;
        // MORE AND MORE
    }

    public View getView(...) {
        lButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if(mListener.get() != null) {
                    mListener.get().preformClick(v);
                }
            }
        });
    }
}

Upvotes: 1

Autocrab
Autocrab

Reputation: 3757

implement interfaces for button (onclick), seekbar (onprogress) in your activity. Then pass these interfaces to the adapter's constructor. in method getView() assign these listeners to views.

Upvotes: 0

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