今天和视觉调样式的时候，发现一个问题，我们代码中经常使用fontFamily的样式，比如：

android:id="@+id/name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="@dimen/dip12"

android:text="小粗体样式"

android:textColor="@color/color_333333"

android:textSize="@dimen/dip12"

android:fontFamily="sans-serif-medium" />

//设置sans-serif-medium样式

但是如果我不是通过xml设置样式，而是想在自定义View中设置这种样式该怎么做呢？百度了一下，竟然没有找到相关的文章，真想给差评啊！那就只能靠自己了。

一/查看fontFamily属性的定义

该属性定义在系统的attrs.xml中，既然定义了一种属性，那么代码中一定会获取这个属性值。

二/查看TextView源代码中如何使用的

首先获取属性值赋值给一个内部类TextAppearanceAttributes，该类专门存储相关属性值。赋值给了mFontFamily

case com.android.internal.R.styleable.TextAppearance_fontFamily:

if (!context.isRestricted() && context.canLoadUnsafeResources()) {

try {

attributes.mFontTypeface = appearance.getFont(attr);

} catch (UnsupportedOperationException | Resources.NotFoundException e) {

// Expected if it is not a font resource.

}

}

if (attributes.mFontTypeface == null) {

attributes.mFontFamily = appearance.getString(attr);

}

attributes.mFontFamilyExplicit = true;

break;

然后看看哪里使用到mFontFamily。

//代码使用处

setTypefaceFromAttrs(attributes.mFontTypeface, attributes.mFontFamily,

attributes.mTypefaceIndex, attributes.mStyleIndex, attributes.mFontWeight);

相关的方法

/**

* Sets the Typeface taking into account the given attributes.

*

* @param typeface a typeface

* @param familyName family name string, e.g. "serif"

* @param typefaceIndex an index of the typeface enum, e.g. SANS, SERIF.

* @param style a typeface style

* @param weight a weight value for the Typeface or -1 if not specified.

*/

private void setTypefaceFromAttrs(@Nullable Typeface typeface, @Nullable String familyName,

@XMLTypefaceAttr int typefaceIndex, @Typeface.Style int style,

@IntRange(from = -1, to = Typeface.MAX_WEIGHT) int weight) {

if (typeface == null && familyName != null) {

// Lookup normal Typeface from system font map.

final Typeface normalTypeface = Typeface.create(familyName, Typeface.NORMAL);

resolveStyleAndSetTypeface(normalTypeface, style, weight);

} else if (typeface != null) {

resolveStyleAndSetTypeface(typeface, style, weight);

} else { // both typeface and familyName is null.

switch (typefaceIndex) {

case SANS:

resolveStyleAndSetTypeface(Typeface.SANS_SERIF, style, weight);

break;

case SERIF:

resolveStyleAndSetTypeface(Typeface.SERIF, style, weight);

break;

case MONOSPACE:

resolveStyleAndSetTypeface(Typeface.MONOSPACE, style, weight);

break;

case DEFAULT_TYPEFACE:

default:

resolveStyleAndSetTypeface(null, style, weight);

break;

}

}

}

所以参考源代码，我们就知道怎么使用了。

如果是TextView的话：

TextView textView=findViewById(R.id.text);

String familyName = "sans-serif-medium";

final Typeface normalTypeface = Typeface.create(familyName, Typeface.NORMAL);

textView.setTypeface(normalTypeface)

如果是TextPaint的话：

Paint paint = new Paint();

Typeface normalTypeface = Typeface.create("sans-serif-medium", Typeface.NORMAL);

paint.setTypeface(normalTypeface);

真的很简单，几分钟搞定，比百度中搜答案还快。

本文地址：https://blog.csdn.net/AA5279AA/article/details/110636893