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：
<TextView
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。
<!-- Default font family. -->
<attr name="fontFamily" format="string" />
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);
