MergeAdapter with Gridview

问题

Libraries:

https://github.com/commonsguy/cwac-merge
https://github.com/maurycyw/StaggeredGridView
https://github.com/chrisbanes/Android-PullToRefresh

I'd like to add a gridview adapter with MergeAdapter.

1st way, If you set adapter:

plv = (PullToRefreshListView) LayoutInflater.from(context).inflate(
                    R.layout.layout_listview_in_viewpager, container, false);
adapter = new MergeAdapter();
sadapter = new StaggeredAdapter(BaseSampleActivity.this, R.id.imageView1, urls);
adapter.addAdapter(sadapter);
plv.setAdapter(adapter);

Then it works like a list view.

2nd way, if you build a view:

plv = (PullToRefreshListView) LayoutInflater.from(context).inflate(
                    R.layout.layout_listview_in_viewpager, container, false);
adapter = new MergeAdapter();
adapter.addView(buildlabel3(context));
plv.setAdapter(adapter);

public View buildlabel3(Context context) {
        // TODO Auto-generated method stub

        RelativeLayout v = (RelativeLayout)LayoutInflater.from(context).inflate(R.layout.activity_main, null);
        StaggeredGridView gridView = (StaggeredGridView) v.findViewById(R.id.staggeredGridView1);

        int margin = getResources().getDimensionPixelSize(R.dimen.margin);

        gridView.setItemMargin(margin); // set the GridView margin
        gridView.setPadding(margin, 0, margin, 0); // have the margin on the sides as well 

        StaggeredAdapter sadapter = new StaggeredAdapter(BaseSampleActivity.this, R.id.imageView1, urls);

        gridView.setAdapter(sadapter);
        sadapter.notifyDataSetChanged();
        Log.e("view", v.toString());
        return v;
    }

Then it doesn't show anything and with no error.

回答1:

addView() on MergeAdapter is designed for ListView headers and the like. You, instead, are attempting to put a GridView as an element inside of some other AdapterView that is using the MergeAdapter. That is not supported by MergeAdapter, and putting a GridView inside of another AdapterView is unlikely to work no matter how you try to do it.

Also, I do not recommend making an Adapter be static, and certainly not a MergeAdapter, as it would represent a significant memory leak (and is unnecessary in the first place).

回答2:

You problem is very generic. As in your code

private static MergeAdapter adapter = null;
adapter.addView(buildlabel3(context));

adapter is null, and not initialised. So whatever you add to it, it still null.

I have seen the soucre code of MergeAdapter. It has a constructor:

public MergeAdapter() {
    super();
}

So just change your code to

private static MergeAdapter adapter = new MergeAdapter();
adapter.addView(buildlabel3(context));

and then try again.

来源：https://stackoverflow.com/questions/18197626/mergeadapter-with-gridview

标签

android

gridview

commonsware-cwac