java - 自定义字体未应用

Question

我的自定义字体类

public class CustomFontText extends TextView {
    /*
  * Caches typefaces based on their file path and name, so that they don't have to be created every time when they are referenced.
  */
    private static Typeface mTypeface;

    public CustomFontText(final Context context) {
        super(context, null);
    }

    public CustomFontText(final Context context, final AttributeSet attrs) {
        super(context, attrs, 0);
        readAttrs(context, attrs);
    }

    public CustomFontText(final Context context, final AttributeSet attrs, final int defStyle) {
        super(context, attrs, defStyle);
        readAttrs(context, attrs);
    }

    private void readAttrs(Context context, AttributeSet attrs) {
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomTextView);

        // Read the title and set it if any
        String fontName = a.getString(R.styleable.CustomTextView_fontname);
        if (fontName != null) {
            // We have a attribute value
            if (mTypeface == null) {
                mTypeface = Typeface.createFromAsset(context.getAssets(), fontName);
                setTypeface(mTypeface);
            }
        }

        // a.recycle();
    }
}

在XMl文件中应用

<somepackage.CustomFontText
            android:id="@+id/details"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="ewfewfewqfewfwef"
            custom:fontname="Roboto-Regular.ttf" />

它没有给出任何类型的错误，但我无法查看 TextView 中的任何更改。更改字体名称没有什么区别。

Answer 1

将代码 setTypeface(mTypeface); 移至 mTypeface == null 检查之外应该可以解决该问题。所以代码应该如下所示:

if (mTypeface == null) {
    mTypeface = Typeface.createFromAsset(context.getAssets(), fontName);
}
setTypeface(mTypeface);

这是因为 mTypeface 被声明为 static，并且所有 CustomFontText 实例共享相同的字体(这对于缓存有意义)。如果在检查内部调用 setTypeface，则只会在首次加载字体时应用一次。