android-arrayadapter – Page 3

Android custom Row Item for ListView

May 25, 2022 by Tarik

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

Unable to modify ArrayAdapter in ListView: UnsupportedOperationException

May 21, 2022 by Tarik

I tried it out, myself…Found it didn’t work. So i check out the source code of ArrayAdapter and found out the problem. The ArrayAdapter, on being initialized by an array, converts the array into a AbstractList (List) which cannot be modified. Solution Use an ArrayList<String> instead using an array while initializing the ArrayAdapter. String[] array … Read more

“ArrayAdapter requires the resource ID to be a TextView” XML problems

May 18, 2022 by Tarik

The ArrayAdapter requires the resource ID to be a TextView XML exception means you don’t supply what the ArrayAdapter expects. When you use this constructor: new ArrayAdapter<String>(this, R.layout.a_layout_file, this.file) R.Layout.a_layout_file must be the id of a xml layout file containing only a TextView(the TextView can’t be wrapped by another layout, like a LinearLayout, RelativeLayout etc!), … Read more

How can I update a single row in a ListView?

May 14, 2022 by Tarik

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

notifyDataSetChanged example

April 26, 2022 by Tarik

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