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package com.mapbox.mapboxsdk.utils;
import android.graphics.Typeface;
import android.os.Build;
import androidx.annotation.RequiresApi;
import com.mapbox.mapboxsdk.MapStrictMode;
import com.mapbox.mapboxsdk.log.Logger;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import static com.mapbox.mapboxsdk.constants.MapboxConstants.DEFAULT_FONT;
/**
* Utility class to select a font from a range of font names based on the availability of fonts on the device.
*/
public class FontUtils {
private static final String TAG = "Mbgl-FontUtils";
private static final String TYPEFACE_FONTMAP_FIELD_NAME = "sSystemFontMap";
private static final List<String> DEFAULT_FONT_STACKS = new ArrayList<>();
static {
DEFAULT_FONT_STACKS.add("sans-serif");
DEFAULT_FONT_STACKS.add("serif");
DEFAULT_FONT_STACKS.add("monospace");
}
private FontUtils() {
// no instance
}
/**
* Select a font from a range of font names to match the availability of fonts on the device.
*
* @param fontNames the range of font names to select from
* @return the selected fon
*/
public static String extractValidFont(String... fontNames) {
if (fontNames == null) {
return null;
}
List<String> validFonts;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
validFonts = getDeviceFonts();
} else {
validFonts = DEFAULT_FONT_STACKS;
}
for (String fontName : fontNames) {
if (validFonts.contains(fontName)) {
return fontName;
}
}
Logger.i(TAG, String.format(
"Couldn't map font family for local ideograph, using %s instead", DEFAULT_FONT)
);
return DEFAULT_FONT;
}
@SuppressWarnings( {"JavaReflectionMemberAccess", "unchecked"})
@RequiresApi(Build.VERSION_CODES.LOLLIPOP)
private static List<String> getDeviceFonts() {
List<String> fonts = new ArrayList<>();
try {
Typeface typeface = Typeface.create(Typeface.DEFAULT, Typeface.NORMAL);
Field field = Typeface.class.getDeclaredField(TYPEFACE_FONTMAP_FIELD_NAME);
field.setAccessible(true);
Map<String, Typeface> fontMap = (Map<String, Typeface>) field.get(typeface);
fonts.addAll(fontMap.keySet());
} catch (Exception exception) {
Logger.e(TAG, "Couldn't load fonts from Typeface", exception);
MapStrictMode.strictModeViolation("Couldn't load fonts from Typeface", exception);
}
return fonts;
}
}
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