为 TextView 设置自定义字体导致 onCreate 需要更长的时间来构建

Question

我目前正在我的项目中实现 Roboto 字体。对于某些片段，有很多 TextView 的。我正在创建一个扩展 TextView 以实现自定义字体的自定义视图。有没有更好的方法来加载字体而不增加 onCreate 时间？

扩展 TextView

public class TextViewFont extends TextView {

    public TextViewFont(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(attrs);
    }

    public TextViewFont(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(attrs);

    }

    public TextViewFont(Context context) {
        super(context);
        init(null);
    }

    private void init(AttributeSet attrs) {
        if (attrs != null) {
            TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.TextViewFont);
            String fontName = a.getString(R.styleable.TextViewFont_fontName);
            if (fontName != null) {
                Typeface myTypeface = Typeface.createFromAsset(getContext().getAssets(), "fonts/" + fontName);
                setTypeface(myTypeface);
            }
            a.recycle();
        }
    }
}

XML

<com.eugene.fithealthmaingit.Custom.TextViewFont
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="16dp"
            android:layout_weight="1"
            android:text="@string/dinner"
            android:textColor="@color/text_color"
            android:textSize="16sp"
            app:fontName="Roboto-Regular.ttf"/>

多少TextView的例子

Answer 1

这是救了我一命的图书馆 Calligraphy。真的很好用也很方便。

Answer 2

Typeface.createfromassets 是一个耗时的过程。您应该在 class 中将字体声明为静态变量，然后在构造函数中使用它。

但是在这里您要在每个文本视图的构造函数中加载字体。

如果您有多种字体，请将所有字体设置为静态并适当使用。

更新代码：

public class TextViewFont extends TextView {

        public static Typeface typeface1 = Typeface.createFromAsset(getContext().getAssets(), "fonts/fontName1");
        public static Typeface typeface2 = Typeface.createFromAsset(getContext().getAssets(), "fonts/fontName2");
        public static Typeface typeface3 = Typeface.createFromAsset(getContext().getAssets(), "fonts/fontName3");
        public static Typeface typeface4 = Typeface.createFromAsset(getContext().getAssets(), "fonts/fontName4");
        public static Typeface typeface5 = Typeface.createFromAsset(getContext().getAssets(), "fonts/fontName5");

        public TextViewFont(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
            init(attrs);
        }

        public TextViewFont(Context context, AttributeSet attrs) {
            super(context, attrs);
            init(attrs);

        }

        public TextViewFont(Context context) {
            super(context);
            init(null);
        }

        private void init(AttributeSet attrs) {
            if (attrs != null) {
                TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.TextViewFont);
                String fontName = a.getString(R.styleable.TextViewFont_fontName);
                if (fontName != null) {
                    setTypeface(getTypeFace(fontName));
                }
                a.recycle();
            }
        }


        public Typeface getTypeFace(String fontName){
            if(fontName.equals("fontName1")){
                return typeface1;
            }else if(fontName.equals("fontName2")){
                return typeface2;
            }else if(fontName.equals("fontName3")){
                return typeface3;
            }else if(fontName.equals("fontName4")){
                return typeface4;
            }else if(fontName.equals("fontName5")){
                return typeface5;
            }
        }
    } 
}

Answer 3

尝试使用实例单例或应用程序单例。看看这是否有效。所以你可以调用 TextLover.get(context).getFont(id)。它将即时创建并缓存它。这样您的其他视图也可以重用字体缓存。例如。按钮

class TextLover {

    private static TextLover singleton;

    private final Context context;

    private final SparseArray<Typeface> faces = new SparseArray<Typeface>();

    public TextLover get(Context context) {
        if (singleton == null) {
            singleton = new TextLover(context);
        }
        return singleton;
    }

    private TextLover(Context context) {
        this.context = context;
    }

    private static final String[] fonts = {
        "fonts/fontName1",
        "fonts/fontName2",
        "fonts/fontName3",
        "fonts/fontName4",
        "fonts/fontName5",
            ...
        "fonts/fontName100"
    }

    // NOTE you need a mapping of ids to each asset font in fonts[]

    public Typeface getFont(int id) {
        Typeface font = faces.get(id);
        if (font == null) {
            font = Typeface.createFromAsset(context.getAssets(), fonts[id]);
            faces.append(id, font);
        }
        return font;
    }

}

为 TextView 设置自定义字体导致 onCreate 需要更长的时间来构建

Setting Custom Font for TextView causing the onCreate to take longer to build

android

android-custom-view

android-fonts