android-adapter

问题 I'm looking into writing a custom adapter to populate a listview with 3 textviews per line. I've found quite a bit of example code to do this, but the one that seemed the best was at: http://www.anddev.org/custom_widget_adapters-t1796.html After a few minor tweaks to fix some compiler issues with the latest Android SDK, I got it running, only to get the exception: ERROR/AndroidRuntime(281): java.lang.UnsupportedOperationException: addView(View, LayoutParams) is not supported in AdapterView So

问题 So after I set the filter on my listview: //Log adapter count before filter listView.getFilter().filter(searchStr) //Log adapter count after filter What I'm trying to achieve is to get the count of the result of that filtering. Like if before there are 10 items, then I apply the filter, so now only 5 items will appear, I want to get that count "5". I've tried checking the adapter count before and after the filter with no luck. They're displaying same count (I'm using a

问题 I want to disply list of items using Custom ArrayAdapter . I will insert data by clicking a button. MainFragment.java @Override public void onClick(View v) { DatabaseClass feed = new DatabaseClass(getActivity()); new DatabaseClass(getActivity()).getList(); new MyFragment().updateList(); } My layout file is as follows. main.xml <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <fragment android:id="@+id/update" android:name=

问题 I have a custom baseadapter which does some lazy loading of some images, and then inflating the layout so I end up with a listview where I have both image and text in one row. When the user presses one item of the listview, say for example item 0 (top item), I want to show a dialog box with some specific content. This content depends on the item number - so the content shown for item 0 is not the same as for item 1, and so on. Here is the getView method of the custom adapter: public View

问题 I have made a horizontal recyclerview inside a fragment. Now when I click on any item I don't see the on click listener working. Here is my code for the Adapter class: public class FeaturedProductsAdapter extends RecyclerView.Adapter<FeaturedProductsAdapter.CustomViewHolder> { private List<FeaturedProductInfo> feedItemList; private Context mContext; public FeaturedProductsAdapter(Context context, List<FeaturedProductInfo> feedItemList) { this.feedItemList = feedItemList; this.mContext =

问题 I have a pretty common scenario, but I am stuck trying to figure out how to retrieve data from certain json objects within the same json response but returning different size of items. To make it less confusing, here's my json response: { "totalResults": 5, "meetings": [ { "id": "754e6670-2376-4eb2-b5f6-ea63ca7c2669", "dateStart": "2019-11-28T15:25:36.000Z", "dateEnd": "2019-11-28T23:00:36.000Z", "visitors": [ { "visitId": "34608af6-bbe4-439c-b472-500790385f60", "firstName": "Lord", "lastName

问题 I created a table view in list view adapter programmatically. For that first i created a Adapter layout as : <?xml version="1.0" encoding="utf-8"?> <TableLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/black" android:stretchColumns="*" android:id="@+id/tablelayout" > </ableLayout> Then what I have done in the adapter is: public class DemoAdapter extends ArrayAdapter

问题 I am developing an application in which I need to implement radio buttons in list view. I want to implement a list view having one radio button and two text view in each row. And one button "Ok" below listview. What I have done is I created a list view and a custom adapter. The code of listview is as: <ListView android:id="@+id/listview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:cacheColorHint="#00000000" android:overScrollMode="never" tools:ignore=

问题 I always use LayoutInflater and findViewById for creating new item in the getView method of an Adapter . But in many articles people write that findViewById is very very slow and strongly recommend to use the View Holder Pattern. Can anyone explain why findViewById is so slow? And why the View Holder Pattern is faster? And what should I do if needed to add different items to a ListView ? Should I create classes for each type? static class ViewHolderItem1 { TextView textViewItem; } static

问题 I'm using ActiveAndroid ORM and UltimateRecyclerView in my Android application. I don't know how to display a data in a list using this popular libraries. I know, the data is saved to database correctly. Using the following method, I'm getting a cursor to the data I want to display. public Cursor eventsCursor() { // `Event` is an ActiveAndroid model class String query = new Select() .from(Event.class) .orderBy("time") .toSql(); return ActiveAndroid.getDatabase().rawQuery(query, null); } I