Boolean Resources

XML-defined logical values used within a app.

• Storage: res/values/<any_name>.xml
• Reference (Java): R.bool.<flag_name>
• Reference (XML): @[package:]bool/<flag_name>

Structure:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <bool name="is_compact_mode">false</bool>
</resources>

The <bool> element stores either true or false. Its name becomes the resource identifier.

Usage in code:

Resources res = getResources();
boolean compact = res.getBoolean(R.bool.is_compact_mode);

val compact: Boolean = resources.getBoolean(R.bool.is_compact_mode)

Usage in layout:

<View
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:visibility="@bool/is_compact_mode" />

---

Color Resources

Define colors in hexadecimal notation inside XML. Formats supported:

• #RGB, #ARGB, #RRGGBB, #AARRGGBB

• Storage: res/values/<any_name>.xml

• Reference (Java): R.color.<color_name>

• Reference (XML): @[package:]color/<color_name>

Structure:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="vivid_green">#0F0</color>
    <color name="semi_blue">#800000FF</color>
</resources>

Code access:

Resources res = getResources();
int vivid = res.getColor(R.color.vivid_green);

val vivid: Int = resources.getColor(R.color.vivid_green)

Layout usage:

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="@color/semi_blue" />

---

Dimension Resources

Represent size quantities with units. Supported units: dp, sp, pt, px, mm, in.

• Storage: res/values/<any_name>.xml
• Reference (Java): R.dimen.<dim_name>
• Reference (XML): @[package:]dimen/<dim_name>

Structure:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="btn_height">48dp</dimen>
    <dimen name="label_textsize">14sp</dimen>
</resources>

Code retrieval:

Resources res = getResources();
float height = res.getDimension(R.dimen.btn_height);

val height: Float = resources.getDimension(R.dimen.btn_height)

Layout application:

<Button
    android:layout_height="@dimen/btn_height"
    android:textSize="@dimen/label_textsize" />

---

ID Resources

Declare unique identifiers for views or logical items.

• Storage: res/values/<any_name>.xml
• Reference (Java): R.id.<identifier>
• Reference (XML): @[package:]id/<identifier>

Structure:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item type="id" name="confirm_btn" />
    <item type="id" name="warning_dialog" />
</resources>

IDs serve as markers; they do not represent actual resources.

Assigning in layout:

<Button android:id="@id/confirm_btn" />

Using in code:

showDialog(R.id.warning_dialog);

showDialog(R.id.warning_dialog)

Matching in dialog creation:

protected Dialog onCreateDialog(int id) {
    if (id == R.id.warning_dialog) {
        // build dialog
    }
    return null;
}

override fun onCreateDialog(id: Int): Dialog? {
    return if (id == R.id.warning_dialog) { /* build dialog */ } else null
}

---

Integer Resources

Store whole numbers in XML.

• Storage: res/values/<any_name>.xml
• Reference (Java): R.integer.<num_name>
• Reference (XML): @[package:]integer/<num_name>

Structure:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <integer name="retry_limit">3</integer>
</resources>

Access:

Resources res = getResources();
int limit = res.getInteger(R.integer.retry_limit);

val limit: Int = resources.getInteger(R.integer.retry_limit)

---

Integer Array Resources

Define arrays of integers in XML.

• Storage: res/values/<any_name>.xml
• Reference (Java): R.array.<arr_name>
• Reference (XML): @[package:]array/<arr_name>

Structure:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <integer-array name="prime_nums">
        <item>2</item>
        <item>3</item>
        <item>5</item>
        <item>7</item>
    </integer-array>
</resources>

Retrieval:

Resources res = getResources();
int[] primes = res.getIntArray(R.array.prime_nums);

val primes: IntArray = resources.getIntArray(R.array.prime_nums)

---

Typed Array Resources

Create arrays holding mixed resource types via TypedArray.

• Storage: res/values/<any_name>.xml
• Reference (Java): R.array.<arr_name>
• Reference (XML): @[package:]array/<arr_name>

Structure:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <array name="ui_icons">
        <item>@drawable/icon_home</item>
        <item>@drawable/icon_profile</item>
    </array>
    <array name="theme_colors">
        <item>#FFFFFFFF</item>
        <item>#FF000000</item>
    </array>
</resources>

Usage in code:

Resources res = getResources();
TypedArray icons = res.obtainTypedArray(R.array.ui_icons);
Drawable homeIcon = icons.getDrawable(0);
icons.recycle();

TypedArray themeColors = res.obtainTypedArray(R.array.theme_colors);
int bg = themeColors.getColor(0, 0);
themeColors.recycle();

val icons: TypedArray = resources.obtainTypedArray(R.array.ui_icons)
val homeIcon: Drawable = icons.getDrawable(0)
icons.recycle()

val themeColors: TypedArray = resources.obtainTypedArray(R.array.theme_colors)
val bg: Int = themeColors.getColor(0, 0)
themeColors.recycle()