问在Android EditText中使用自定义字体时，如何提高性能？

EN

import java.util.HashMap;

import android.content.Context;
import android.graphics.Typeface;
import android.util.Log;

public class FontFactory {
private static FontFactory instance;
private HashMap<String, Typeface> fontMap = new HashMap<String, Typeface>();
private Context context;

private FontFactory(Context context) {
    this.context = context.getApplicationContext();
}

public static FontFactory getInstance(Context context) {
    if(instance == null){
        return instance = new FontFactory(context);
    } else {
        return instance;
    }
}

public Typeface getFont(String font) {
    Typeface typeface = fontMap.get(font);
    if (typeface == null) {
        try {
            typeface = Typeface.createFromAsset(context.getResources().getAssets(), "fonts/" + font);
            fontMap.put(font, typeface);  
        } catch (Exception e) {
            Log.e("FontFactory", "Could not get typeface: " + e.getMessage() + " with name: " + font);
            return null;
        }

    }
    return typeface;
}