<string-array name="categories_array">
    <item>Clothes</item>
    <item>Electronics</item>
    <item>Gifts</item>
    <item>Food</item>
</string-array>
<string-array name="clothes">
    <item>Clothes</item>
    <item>Electronics</item>
    <item>Gifts</item>
    <item>Food</item>
    <item>Books</item>
    <item>Music</item>
    <item>Bags</item>
</string-array>
<string-array name="electronics">
    <item>Clothes</item>
    <item>Electronics</item>
    <item>Gifts</item>
    <item>Food</item>
    <item>Books</item>
    <item>Music</item>
    <item>Bags</item>
</string-array>
<string-array name="gifts">
    <item>Clothes</item>
    <item>Electronics</item>
    <item>Gifts</item>
    <item>Food</item>
    <item>Books</item>
    <item>Music</item>
    <item>Bags</item>
</string-array>
<string-array name="food">
    <item>Clothes</item>
    <item>Electronics</item>
    <item>Gifts</item>
    <item>Food</item>
    <item>Books</item>
    <item>Music</item>
    <item>Bags</item>
</string-array>

int resId = getResources().getIdentifier("nameOfStringResource", "array", getPackageName());

int resId = getResources().getIdentifier("categories_array", "array", getPackageName());

String name = "your_array";
final Field field = R.array.getField(name);
int id = field.getInt(null);
String[] strings = getResources().getStringArray(id);

String name = "your_array";
int id = getResources().getIdentifier(name, "array", getPackageName());
String[] strings = getResources().getStringArray(id);

getResources().getString(R.string.your_string)

getResources().getStringArray(R.array.your_string)