Access string-array resource programmatically and add value to it

Question

I have an empty string-array resource in my strings.xml file like below:

<string-array name="categories"/>

I'm getting array of data from an API back which I need to populate onto a listview. Its ArrayAdapter takes in an @ArrayResource int for its resource like below:

public void showListViewDialog(…, @ArrayRes int arrayResource) {

    ...

    ListView listView = alertDialogView.findViewById(R.id.listViewCategories);
    ArrayAdapter arrayAdapter = ArrayAdapter.createFromResource(context,
            arrayResource, R.layout.custom_list_item);

    listView.setAdapter(arrayAdapter);

}

In my Java class, this is how I am retrieving the string-array resource:

List<String> categoriesToAdd= Arrays.asList(getResources().getStringArray(R.array.categories));

How can I then add the data back to it? I've tried the following but it does not work:

List<String> listCategories = new ArrayList<>();
listCategories.add(categoriesToAdd);

do you want to change string resource at runtime?

Zaid Mirza
– Zaid Mirza

2019-01-22 05:38:15 +00:00
Commented Jan 22, 2019 at 5:38 — Zaid Mirza
– Zaid Mirza, Commented Jan 22, 2019 at 5:38
Yes, dynamically as I fetch the content online

Boron
– Boron

2019-01-22 05:39:38 +00:00
Commented Jan 22, 2019 at 5:39 — Boron
– Boron, Commented Jan 22, 2019 at 5:39
it is impossible to change resources at runtime

Vladyslav Matviienko
– Vladyslav Matviienko

2019-01-22 05:45:39 +00:00
Commented Jan 22, 2019 at 5:45 — Vladyslav Matviienko
– Vladyslav Matviienko, Commented Jan 22, 2019 at 5:45

Nabin Bhandari · Accepted Answer · 2019-01-22 05:43:32Z

2

It is not possible to alter the string-array resource at run-time. So you cannot update it to show data in a ListView.

You don't need a string-array resource to create an ArrayAdapter. Instead, you can simply pass an ArrayList to its constructor to create it.

For example:

List<String> data = new ArrayList<>();

// sample data
data.add("Data 1");
data.add("Data 2");

final ArrayAdapter<String> adapter = new ArrayAdapter<>(this /*context*/,
        android.R.layout.simple_list_item_1, android.R.id.text1, data);

ListView listView = findViewById(R.id.listView);
listView.setAdapter(adapter);

Now if you want to add data to the list, use:

adapter.add("Data 3");

answered Jan 22, 2019 at 5:43

Nabin Bhandari

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Comments

Zaid Mirza · Accepted Answer · 2019-01-22 05:42:53Z

1

AFIK, Its not possible to change any resource files at runtime which bundled in APK. What you can do, just fetch your data from API and use it and if you want to save it for later use then save it in SharedPreferences file

answered Jan 22, 2019 at 5:42

Zaid Mirza

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