单个自定义 TextView 的多种字体

Question

我们如何在单个自定义中使用不同风格的 Roboto（或任何其他）字体（Roboto-Regular、Roboto-Thin、Roboto-Bold 等）TextView。

描述了一种以编程方式执行此操作的方法here。但是，如果我们想使用 XML.

更改样式，该如何实现呢？

可以使用这样的自定义属性来完成吗？

<com.project.abc.customviews.XYZTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Welcome"
        app:type="thin" />

我不想为每种类型创建不同的 java 文件。 here 描述了另一种方法，但这存在内存问题。寻找好的解决方案。

Answer 1

我是这样实现的：

创建了自定义 TextView

public class CaptainTextView extends TextView {
private HashMap<String, Typeface> mTypefaces;

public CaptainTextView(Context context) {
    super(context);
}

public CaptainTextView(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
super(context, attrs, defStyleAttr);
if (mTypefaces == null) {
    mTypefaces = new HashMap<>();
}

if (this.isInEditMode()) {
    return;
}

final TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.CaptainTextView);
if (array != null) {
    final String typefaceAssetPath = array.getString(
        R.styleable.CaptainTextView_customTypeface);

    if (typefaceAssetPath != null) {
        Typeface typeface;

        if (mTypefaces.containsKey(typefaceAssetPath)) {
            typeface = mTypefaces.get(typefaceAssetPath);
        } else {
            AssetManager assets = context.getAssets();
            typeface = Typeface.createFromAsset(assets, typefaceAssetPath);
            mTypefaces.put(typefaceAssetPath, typeface);
        }

        setTypeface(typeface);
    }
    array.recycle();
}
}

public CaptainTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    if (mTypefaces == null) {
        mTypefaces = new HashMap<>();
    }

    if (this.isInEditMode()) {
        return;
    }

    final TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.CaptainTextView);
    if (array != null) {
        final String typefaceAssetPath = array.getString(
            R.styleable.CaptainTextView_customTypeface);

        if (typefaceAssetPath != null) {
            Typeface typeface;

            if (mTypefaces.containsKey(typefaceAssetPath)) {
                typeface = mTypefaces.get(typefaceAssetPath);
            } else {
                AssetManager assets = context.getAssets();
                typeface = Typeface.createFromAsset(assets, typefaceAssetPath);
                mTypefaces.put(typefaceAssetPath, typeface);
            }

            setTypeface(typeface);
        }
        array.recycle();
    }
}
}

声明了自定义属性

<resources>
<declare-styleable name="CaptainTextView">
    <attr name="customTypeface" format="string" />
</declare-styleable>
</resources>

用于XML

<com.project.captain.customviews.CaptainTextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Welcome"
    android:textSize="16sp"
    android:textStyle="bold"
    app:customTypeface="fonts/Roboto-Thin.ttf" />

瞧！

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