Question

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

here描述了以编程方式执行此操作的方法之一。但是如果我们想要使用XML来改变样式，如何实现这一点。

可以使用像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" />

我不想为每种类型制作不同的java文件。另一种方法是here，但这有关于记忆的问题。寻找一个好的解决方案。

Answer 1

这就是我的成就：

创建自定义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>

在XML中使用

<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！

多个字体到单个自定义TextView

1 个答案: