Add Style after creating a View programmatically

Question

The Title says it all, hopefully.

1) I create a View programmatically:

RelativeLayout rl = new RelativeLayout(this);

2) I want to a

Answer 1

You can't apply a style after constructing a view. The correct way to do this is to use the 4-argument constructor on Android 5.0+ or to create a theme attribute that references your style and use the 3-argument constructor.

// Works on versions prior to Android 5.0
RelativeLayout rl = new RelativeLayout(this, null, R.attr.myRelativeLayoutStyle);

// Works on Android 5.0 and above
RelativeLayout r2 = new RelativeLayout(this, null, 0, R.style.MyRelativeLayout);

res/values/attrs.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="myRelativeLayoutStyle" format="reference" />
    ...

res/values/styles.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="MyRelativeLayout">
        ...
    </style>
    ...

res/values/themes.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="MyAppTheme" parent="...">
        <item name="myRelativeLayoutStyle">@style/MyRelativeLayout</item>
        ...