I created a custom View (find it here) with an declare-styleable attribute of type enum. In xml I can now choose one of the enum entries for my custom attribute. Now I want to create an method to set this value programmatically, but I can not access the enum.
attr.xml
<declare-styleable name="IconView">
<attr name="icon" format="enum">
<enum name="enum_name_one" value="0"/>
....
<enum name="enum_name_n" value="666"/>
</attr>
</declare-styleable>
layout.xml
<com.xyz.views.IconView
android:id="@+id/heart_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:icon="enum_name_x"/>
What I need is something like: mCustomView.setIcon(R.id.enum_name_x);
But I can not find the enum or I even have no idea how I can get the enum or the names of the enum.
There does not seem to be an automated way to get a Java enum from an attribute enum - in Java you can get the numeric value you specified - the string is for use in XML files (as you show).
You could do this in your view constructor:
TypedArray a = context.getTheme().obtainStyledAttributes(
attrs,
R.styleable.IconView,
0, 0);
// Gets you the 'value' number - 0 or 666 in your example
if (a.hasValue(R.styleable.IconView_icon)) {
int value = a.getInt(R.styleable.IconView_icon, 0));
}
a.recycle();
}
If you want the value into an enum you would need to either map the value into a Java enum yourself, e.g.:
private enum Format {
enum_name_one(0), enum_name_n(666);
int id;
Format(int id) {
this.id = id;
}
static Format fromId(int id) {
for (Format f : values()) {
if (f.id == id) return f;
}
throw new IllegalArgumentException();
}
}
Then in the first code block you could use:
Format format = Format.fromId(a.getInt(R.styleable.IconView_icon, 0)));
(though throwing an exception at this point may not be a great idea, probably better to choose a sensible default value)