Android将Roboto字体设置为粗体，斜体，常规，…（类似于自定义字体系列）

Question

I know ho to set custom font programmatically inside Android app. Is there any way to load typeface for custom font (assets) and Android framework will use proper file based on bold, italic and so on?

For example now I'm trying to set Roboto font to some TextView

Typeface typeface = Typeface.createFromAsset(getAssets(), "fonts/Roboto/Roboto-Regular.ttf");
textView.setTypeface(typeface);

It works ok. But since I set TextView inside xml layout to bold , text is not bolded

<TextView
    android:id="@+id/my_id"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="50dp"
    android:textStyle="bold"
    android:gravity="center"
    android:text="@string/my_text"
    android:textColor="@color/my_foreground"
    android:textSize="24dp" />

How to load typeface from assets properly that this will work?

textView.setTypeface(typeface, Typeface.BOLD);

Inside my assets dir there is only one "font family"

Roboto-Black.ttf
Roboto-BlackItalic.ttf
Roboto-Bold.ttf
Roboto-BoldCondensed.ttf
Roboto-BoldCondensedItalic.ttf
Roboto-BoldItalic.ttf
Roboto-Condensed.ttf
Roboto-CondensedItalic.ttf
Roboto-Italic.ttf
Roboto-Light.ttf
Roboto-LightItalic.ttf
Roboto-Medium.ttf
Roboto-MediumItalic.ttf
Roboto-Regular.ttf
Roboto-Thin.ttf
Roboto-ThinItalic.ttf

How to load all that fonts inside one typeface/family?

Answer 1

Not sure if it's a good idea to post a link, but anyway... Here is my blog post on this topic, it has a class that solves this problem fully. http://anton.averin.pro/2012/09/12/how-to-use-android-roboto-font-in-honeycomb-and-earlier-versions/

Answer 2

I don't know of a way to treat different typeface variants of a single font as one family, but typefaces tend to have large file sizes so you probably wouldn't want to import all those typefaces into your app anyway. Instead, you could use just the Medium font and then set bold and italic attributes for that.

For example, if you have android:textStyle="bold" set in your XML layout, you can do this in your code to keep the bold style:

Typeface currentTypeFace = textView.getTypeface();
if (currentTypeFace != null && currentTypeFace.getStyle() == Typeface.BOLD) {
    textView.setTypeface(tf, Typeface.BOLD);
} else {
    textView.setTypeface(tf);
}