onClick事件不适用于Android中的嵌套列表视图项控件

Question

I have 2 popups. On the first popup I have ListView with selectable items. When I click item from first list, then second popup appear, which also has ListView with options to select.

I've implemented first list view items as custom View and subscribing to clicks inside view constructor, like that:

class CustomListItem extends RelativeLayout{
    public CustomListItem(){
        ...
       //inflating stuff there
       ((Button)findViewById(R.id.listItemButton)).setOnClickListener(
           //This code not working as expected, but then could fire a lot of times
           v -> System.out.println("item clicked");  
       );
    }
}

When I open first dialog for the first time onClick handler fires as expected and second popup appears. But when I close second popup and return back (calling Dialog.dismiss() for popup) to the first popup, then onClick handler on first listview stops working. There are some other inetersting things:

1. onTouch listener for list view item is still working (called for action=ACTION_DOWN and action=ACTION_UP );
2. when I set for listview onItemClickListener it's called always (1st time when popup opened and when we return back to it);
3. when I click many times on item in list view sometimes onClick happens and after that it's called as many times as I clicked before.

Do you have any ideas what may be the reason of the problem?

UPDATE

Seems that there is a problem with getView method inside adapter. I've tried to create a custom list item control inside it (or get it from cache):

@Override
public View getView(int position, View view, ViewGroup parent) {
    if (!constructedViewCache.containsKey(position)) {
        constructedViewCache.put(position, new CustomListItem ());
    }

    return constructedViewCache.get(position);
}

When I changed this code to the code below everything works:

@Override
public View getView(int position, View view, ViewGroup parent) {
    if (view == null)
    {
       view = LayoutInflater.from(context).inflate(R.layout.list_view_item, null);
    }

    view.setOnClickListener(v -> {
         v -> System.out.println("item clicked");
    });

    return view;
}

Why it's not possible to create view with a new CustomListItem () ? Or if it's possible how should I do that?

Answer 1

Try to insert the attribute android:descendantFocusability="blocksDescendants" in the parent layout declaration of your list item where listItemButton is placed.

Where attribute android:descendantFocusability

Defines the relationship between the ViewGroup and its descendants when looking for a View to take focus.

And constant blocksDescendants means that:

The ViewGroup will block its descendants from receiving focus.

Second question

It's possible to create view with a new CustomListItem (). See example below:

@Override
public View getView(int i, View view, ViewGroup viewGroup) {
    return new CustomListItem(context);
}

EDIT

I didn't see your full code, it looks that you are something wrong. Here is working example take a look at:

public class CustomAdapter extends BaseAdapter {
private Context context;
private HashMap<Integer, CustomListItem> constructedViewCache = new HashMap<>();

public CustomAdapter(Context context) {
    this.context = context;
}

@Override
public int getCount() {
    return 20;
}

@Override
public Object getItem(int i) {
    return null;
}

@Override
public long getItemId(int i) {
    return 0;
}

@Override
public View getView(int position, View view, ViewGroup viewGroup) {
    if (!constructedViewCache.containsKey(position)) {
        constructedViewCache.put(position, new CustomListItem(context, position));
    }
    return constructedViewCache.get(position);
}
}

And second class:

public class CustomListItem extends RelativeLayout {
private static final String TAG = "CustomListItem";

public CustomListItem(Context context, int position) {
    super(context);

      View view = LayoutInflater.from(context).inflate(R.layout.item_view, this);
    Button button = (Button) view.findViewById(R.id.button);
    button.setOnClickListener(view1 -> {
        Log.e(TAG, "CustomListItem: " + position );
        FragmentManager fragmentManager = ((AppCompatActivity) context).getSupportFragmentManager();
        new CustomDialog().show(fragmentManager, "tag");
    });

}
}

EDIT 2

I've updated CustomListItem to display dialog when button is clicked. There is code of custom DialogFragment which is using list of items same layout and adapter as activity:

public class CustomDialog extends DialogFragment {

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.activity_main, container, false);
    ListView listView = (ListView) view.findViewById(R.id.list);
    listView.setAdapter(new CustomAdapter(getActivity()));
    return view;
}
}