Persist checked status of items in ListView

Question

I have a ListView of CheckedTextView items, each one uses a radio button. It is a single-choice list indicating a now-playing audio stream in my main activity.

Once one of the items is checked it should remain checked until another item is checked, or until the users 'stops' the stream from a notification or the UI, and the checked status needs to be reset every time the application is quit.

At the minute I'm doing this:

final BookmarkAdapter adapter = new BookmarkAdapter(this, db.getAllBookmarks());
final ListView listView = findViewById(R.id.bookmark_list_view);

listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        View v = listView.getChildAt(position);
        CheckedTextView ctv = v.findViewById(R.id.bookmark_list_item);
        ctv.toggle();
        // ... go on to launch a service and another activity
    }
});

You can see that the item is being checked when you select the list item, before my other activity opens. However, when I return to the main activity, no item is checked any more.

What is the correct way to persist the checked state of the items until the application is closed or I uncheck it manually?

The ListView xml:

<ListView
        android:id="@+id/bookmark_list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:choiceMode="singleChoice"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

The CheckedTextView xml:

<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/bookmark_list_item"
        android:layout_width="match_parent"
        android:layout_height="?android:attr/listPreferredItemHeight"
        android:checkMark="?android:attr/listChoiceIndicatorSingle"
        android:gravity="center_vertical"
        android:paddingLeft="16dip"
        android:paddingRight="16dip"
        android:text="@string/list_item_title"
        android:textAppearance="@style/TextAppearance.AppCompat.Medium" />

Answer 1

I would have one more field in all Objects that are in list. It could be boolean checked, default false, when it is clicked make it true. Then you could save state of object easy. If you change state, just notify adapter that it should redraw itself.