ArrayAdapter uses a TextView to display each item within it. Behind the scenes, it uses the toString() method of each object that it holds and displays this within the TextView. ArrayAdapter has a number of constructors that can be used and the one that you have used in your example is: ArrayAdapter(Context context, int resource, … Read more
If we look at the following code, we have name and value array in getView and getDropDownView. private void initView() { SpinnerDropDownAdapter sddadapter = new SpinnerDropDownAdapter(this); ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, sddadapter.name); Spinner getViewSP = (Spinner) findViewById(R.id.getview_sp); getViewSP.setAdapter(adapter); Spinner getViewWDropDownSP = (Spinner) findViewById(R.id.getview_w_drop_down_sp); getViewWDropDownSP.setAdapter(sddadapter); } static class SpinnerDropDownAdapter extends BaseAdapter implements SpinnerAdapter { Context … Read more
Add this row.xml to your layout folder <?xml version=”1.0″ encoding=”utf-8″?> <LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android” android:layout_width=”match_parent” android:layout_height=”match_parent” android:orientation=”vertical” > <TextView android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:text=”Header”/> <TextView android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:id=”@+id/text”/> </LinearLayout> make your main xml layout as this <?xml version=”1.0″ encoding=”utf-8″?> <LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android” android:layout_width=”fill_parent” android:layout_height=”fill_parent” android:orientation=”horizontal” > <ListView android:id=”@+id/listview” android:layout_width=”fill_parent” android:layout_height=”fill_parent” > </ListView> </LinearLayout> This is your adapter class yourAdapter extends … Read more
You probably should just manually add your items to LinearLayout: LinearLayout layout = … // Your linear layout. ListAdapter adapter = … // Your adapter. final int adapterCount = adapter.getCount(); for (int i = 0; i < adapterCount; i++) { View item = adapter.getView(i, null, null); layout.addView(item); } EDIT: I rejected this approach when I … Read more
I tried it out myself and found it didn’t work, so I checked out the source code of ArrayAdapter and found out the problem: The ArrayAdapter, on being initialized by an array, converts the array into an AbstractList (List<String>) which cannot be modified. Solution Use an ArrayList<String> instead using an array while initializing the ArrayAdapter. … Read more
Here is the difference: BaseAdapter is a very generic adapter that allows you to do pretty much whatever you want. However, you have to do a bit more coding yourself to get it working. ArrayAdapter is a more complete implementation that works well for data in arrays or ArrayLists. Similarly, there is a related CursorAdapter … Read more
1: The LayoutInflater takes your layout XML-files and creates different View-objects from its contents. 2: The adapters are built to reuse Views, when a View is scrolled so that is no longer visible, it can be used for one of the new Views appearing. This reused View is the convertView. If this is null it … Read more
Here’s how I do it, the keys are getItemViewType and getViewTypeCount in the Adapter class. getViewTypeCount returns how many types of items we have in the list, in this case we have a header item and an event item, so two. getItemViewType should return what type of View we have at the input position. Android … Read more
I found the answer, thanks to your information Michelle. You can indeed get the right view using View#getChildAt(int index). The catch is that it starts counting from the first visible item. In fact, you can only get the visible items. You solve this with ListView#getFirstVisiblePosition(). Example: private void updateView(int index){ View v = yourListView.getChildAt(index – … Read more
For an ArrayAdapter, notifyDataSetChanged only works if you use the add(), insert(), remove(), and clear() on the Adapter. When an ArrayAdapter is constructed, it holds the reference for the List that was passed in. If you were to pass in a List that was a member of an Activity, and change that Activity member later, … Read more