Android5.0系统字库

转载：

Android字体工作原理

一、源码位置

1.添加字库

注意，其他随便：

frameworks/base/data/fonts/fonts.xml

<span style="font-size:14px;">        <font weight="400" style="normal">NotoSansCJKjp-Regular.otf</font>  //正常
        <font weight="700" style="normal">NotoSansCJKjp-Bold.otf</font>  //粗体</span>

frameworks/base/data/fonts/Android.mk

<span style="font-size:14px;"><span style="font-size:14px;"><span style="font-size:14px;">font_src_files += \
    NotoSansCJKjp-Black.otf \
    NotoSansCJKjp-Bold.otf \
    NotoSansCJKjp-DemiLight.otf \
    NotoSansCJKjp-Light.otf \
    NotoSansCJKjp-Medium.otf \
    NotoSansCJKjp-Regular.otf \
    NotoSansCJKjp-Thin.otf \
    NotoSansCJKkr-Black.otf \
    NotoSansCJKkr-Bold.otf \
    NotoSansCJKkr-DemiLight.otf \
    NotoSansCJKkr-Light.otf \
    NotoSansCJKkr-Medium.otf \
    NotoSansCJKkr-Regular.otf \
    NotoSansCJKkr-Thin.otf \
    NotoSansCJKsc-Black.otf \
    NotoSansCJKsc-Bold.otf \
    NotoSansCJKsc-DemiLight.otf \
    NotoSansCJKsc-Light.otf \
    NotoSansCJKsc-Medium.otf \
    NotoSansCJKsc-Regular.otf \
    NotoSansCJKsc-Thin.otf \
    NotoSansCJKtc-Black.otf \
    NotoSansCJKtc-Bold.otf \
    NotoSansCJKtc-DemiLight.otf \
    NotoSansCJKtc-Light.otf \
    NotoSansCJKtc-Medium.otf \
    NotoSansCJKtc-Regular.otf \
    NotoSansCJKtc-Thin.otf </span></span></span>

注意：

external/skia/include/core/SkTypeface.h

<span style="font-size:14px;">    enum Style {
        kNormal = 0,
        kBold   = 0x01,
        kItalic = 0x02,

        // helpers
        kBoldItalic = 0x03
    };</span>

frameworks/base/core/jni/android/graphics/TypefaceImpl.cpp

<span style="font-size:14px;">static void resolveStyle(TypefaceImpl* typeface) {
    int weight = typeface->fBaseWeight / 100;  //默认400
    if (typeface->fSkiaStyle & SkTypeface::kBold) {
        weight += 3;  //粗体：700
    }
    if (weight > 9) {
        weight = 9;
    }
    bool italic = (typeface->fSkiaStyle & SkTypeface::kItalic) != 0;
    typeface->fStyle = FontStyle(weight, italic);
}</span>

frameworks/base/data/fonts/fonts.mk

<span style="font-size:14px;"><span style="font-size:14px;"><span style="font-size:14px;">PRODUCT_PACKAGES += \
    NotoSansCJKjp-Black.otf \
    NotoSansCJKjp-Bold.otf \
    NotoSansCJKjp-DemiLight.otf \
    NotoSansCJKjp-Light.otf \
    NotoSansCJKjp-Medium.otf \
    NotoSansCJKjp-Regular.otf \
    NotoSansCJKjp-Thin.otf \
    NotoSansCJKkr-Black.otf \
    NotoSansCJKkr-Bold.otf \
    NotoSansCJKkr-DemiLight.otf \
    NotoSansCJKkr-Light.otf \
    NotoSansCJKkr-Medium.otf \
    NotoSansCJKkr-Regular.otf \
    NotoSansCJKkr-Thin.otf \
    NotoSansCJKsc-Black.otf \
    NotoSansCJKsc-Bold.otf \
    NotoSansCJKsc-DemiLight.otf \
    NotoSansCJKsc-Light.otf \
    NotoSansCJKsc-Medium.otf \
    NotoSansCJKsc-Regular.otf \
    NotoSansCJKsc-Thin.otf \
    NotoSansCJKtc-Black.otf \
    NotoSansCJKtc-Bold.otf \
    NotoSansCJKtc-DemiLight.otf \
    NotoSansCJKtc-Light.otf \
    NotoSansCJKtc-Medium.otf \
    NotoSansCJKtc-Regular.otf \
    NotoSansCJKtc-Thin.otf </span></span></span>

frameworks/base/data/fonts/font.xml

添加说明：其中一个family家族（比如一套亚洲区域字库）中可以有多个font（比如不同字体），这些font根据不同weight区分；通过alias别名做区分，别名指向相同family名不同weight的font。见下边。

<span style="font-size:14px;"><span style="font-size:14px;"><span style="font-size:14px;">    <!--add by tank-->
    <family name="NotoSansCJKjp"> 
        <font weight="100" style="normal">NotoSansCJKjp-Black.otf</font>
        <font weight="200" style="normal">NotoSansCJKjp-Bold.otf</font>
        <font weight="300" style="normal">NotoSansCJKjp-DemiLight.otf</font>
        <font weight="400" style="normal">NotoSansCJKjp-Light.otf</font>
        <font weight="500" style="normal">NotoSansCJKjp-Medium.otf</font>
        <font weight="600" style="normal">NotoSansCJKjp-Regular.otf</font>
        <font weight="700" style="normal">NotoSansCJKjp-Thin.otf</font>
    </family> 
    <alias name="NotoSansCJKjp-Black" to="NotoSansCJKjp" weight="100" />
    <alias name="NotoSansCJKjp-Bold" to="NotoSansCJKjp" weight="200" />
    <alias name="NotoSansCJKjp-DemiLight" to="NotoSansCJKjp" weight="300" />
    <alias name="NotoSansCJKjp-Light" to="NotoSansCJKjp" weight="400" />
    <alias name="NotoSansCJKjp-Medium" to="NotoSansCJKjp" weight="500" />
    <alias name="NotoSansCJKjp-Regular" to="NotoSansCJKjp" weight="600" />
    <alias name="NotoSansCJKjp-Thin" to="NotoSansCJKjp" weight="700" />
    <family name="NotoSansCJKkr"> 
        <font weight="100" style="normal">NotoSansCJKkr-Black.otf</font>
        <font weight="200" style="normal">NotoSansCJKkr-Bold.otf</font>
        <font weight="300" style="normal">NotoSansCJKkr-DemiLight.otf</font>
        <font weight="400" style="normal">NotoSansCJKkr-Light.otf</font>
        <font weight="500" style="normal">NotoSansCJKkr-Medium.otf</font>
        <font weight="600" style="normal">NotoSansCJKkr-Regular.otf</font>
        <font weight="700" style="normal">NotoSansCJKkr-Thin.otf</font>
    </family> 
    <alias name="NotoSansCJKkr-Black" to="NotoSansCJKkr" weight="100" />
    <alias name="NotoSansCJKkr-Bold" to="NotoSansCJKkr" weight="200" />
    <alias name="NotoSansCJKkr-DemiLight" to="NotoSansCJKkr" weight="300" />
    <alias name="NotoSansCJKkr-Light" to="NotoSansCJKkr" weight="400" />
    <alias name="NotoSansCJKkr-Medium" to="NotoSansCJKkr" weight="500" />
    <alias name="NotoSansCJKkr-Regular" to="NotoSansCJKkr" weight="600" />
    <alias name="NotoSansCJKkr-Thin" to="NotoSansCJKkr" weight="700" />
    <family name="NotoSansCJKsc"> 
        <font weight="100" style="normal">NotoSansCJKsc-Black.otf</font>
        <font weight="200" style="normal">NotoSansCJKsc-Bold.otf</font>
        <font weight="300" style="normal">NotoSansCJKsc-DemiLight.otf</font>
        <font weight="400" style="normal">NotoSansCJKsc-Light.otf</font>
        <font weight="500" style="normal">NotoSansCJKsc-Medium.otf</font>
        <font weight="600" style="normal">NotoSansCJKsc-Regular.otf</font>
        <font weight="700" style="normal">NotoSansCJKsc-Thin.otf</font>
    </family> 
    <alias name="NotoSansCJKsc-Black" to="NotoSansCJKsc" weight="100" />
    <alias name="NotoSansCJKsc-Bold" to="NotoSansCJKsc" weight="200" />
    <alias name="NotoSansCJKsc-DemiLight" to="NotoSansCJKsc" weight="300" />
    <alias name="NotoSansCJKsc-Light" to="NotoSansCJKsc" weight="400" />
    <alias name="NotoSansCJKsc-Medium" to="NotoSansCJKsc" weight="500" />
    <alias name="NotoSansCJKsc-Regular" to="NotoSansCJKsc" weight="600" />
    <alias name="NotoSansCJKsc-Thin" to="NotoSansCJKsc" weight="700" />
    <family name="NotoSansCJKtc"> 
        <font weight="100" style="normal">NotoSansCJKtc-Black.otf</font>
        <span style="color:#ff0000;"><strong><font weight="200" style="normal">NotoSansCJKtc-Bold.otf</font></strong></span>
        <font weight="300" style="normal">NotoSansCJKtc-DemiLight.otf</font>
        <font weight="400" style="normal">NotoSansCJKtc-Light.otf</font>
        <font weight="500" style="normal">NotoSansCJKtc-Medium.otf</font>
        <font weight="600" style="normal">NotoSansCJKtc-Regular.otf</font>
        <font weight="700" style="normal">NotoSansCJKtc-Thin.otf</font>
    </family> 
    <alias name="NotoSansCJKtc-Black" to="NotoSansCJKtc" weight="100" />
    <span style="color:#ff0000;"><strong><alias name="NotoSansCJKtc-Bold" to="NotoSansCJKtc" weight="200" /></strong></span>
    <alias name="NotoSansCJKtc-DemiLight" to="NotoSansCJKtc" weight="300" />
    <alias name="NotoSansCJKtc-Light" to="NotoSansCJKtc" weight="400" />
    <alias name="NotoSansCJKtc-Medium" to="NotoSansCJKtc" weight="500" />
    <alias name="NotoSansCJKtc-Regular" to="NotoSansCJKtc" weight="600" />
    <alias name="NotoSansCJKtc-Thin" to="NotoSansCJKtc" weight="700" />
    <!--end tank--></span></span></span>

最后，需要将添加字库如NotoSansCJKtc-Bold.otf放到frameworks/base/data/fonts/目录下。

frameworks/base/graphics/java/android/graphics/Typeface.java

<span style="font-size:14px;"><span style="font-size:14px;">    private static void init() {
            for (FontListParser.Alias alias : fontConfig.aliases) {
                Typeface base = systemFonts.get(alias.toName);
                Typeface newFace = base;
                int weight = alias.weight;
                if (weight != 400) {
                    newFace = new Typeface(nativeCreateWeightAlias(base.native_instance, weight));
                }
                <span style="color:#ff0000;"><strong>systemFonts.put(alias.name, newFace);</strong></span>
            }
            sSystemFontMap = systemFonts;
    }</span></span>

frameworks/base/graphics/java/android/graphics/FontListParser.java

frameworks/base/core/jni/android_util_StringBlock.cpp

frameworks/base/core/jni/android/graphics/Typeface.cpp

frameworks/base/core/jni/android/graphics/TypefaceImpl.cpp

frameworks/minikin/include/minikin/FontFamily.h

默认字库是font.xml中第一个有效的family

<span style="font-size:14px;"><span style="font-size:14px;">TypefaceImpl* TypefaceImpl_createFromFamilies(const jlong* families, size_t size) {
    std::vector<FontFamily *>familyVec;
    for (size_t i = 0; i < size; i++) {
        FontFamily* family = reinterpret_cast<FontFamily*>(families[i]);
        familyVec.push_back(family);
    }
    TypefaceImpl* result = new TypefaceImpl;
    result->fFontCollection = new FontCollection(familyVec);
    if (size == 0) {
        ALOGW("createFromFamilies creating empty collection");
        result->fSkiaStyle = SkTypeface::kNormal;
    } else {
        const FontStyle defaultStyle;
        FontFamily* firstFamily = reinterpret_cast<FontFamily*>(families[0]);
        MinikinFont* mf = firstFamily->getClosestMatch(defaultStyle).font;
        if (mf != NULL) {
            SkTypeface* skTypeface = reinterpret_cast<MinikinFontSkia*>(mf)->GetSkTypeface();
            // TODO: probably better to query more precise style from family, will be important
            // when we open up API to access 100..900 weights
            result->fSkiaStyle = skTypeface->style();
        } else {
            result->fSkiaStyle = SkTypeface::kNormal;
        }
    }
    result->fBaseWeight = 400;
    resolveStyle(result);
    return result;
}</span></span>

external/noto-fonts/

external/google-fonts/

external/naver-fonts/

external/fonttools

2.使用方法

第一中使用方法：java代码中直接指定MainActivity.java

<span style="font-size:14px;"><span style="font-size:14px;"><span style="font-size:14px;">import android.graphics.Typeface;
public class MainActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final Button btn1;
    btn1 = (Button) findViewById(R.id.btn1);
    btn1.setOnClickListener(new OnClickListener(){
      @Override
      public void onClick(View v) {
        Log.d("TKTK","TK--------->>>btn1 onclick");
        Typeface typeFace =Typeface.create("<span style="color:#ff0000;"><strong>NotoSansCJKtc-Bold</strong></span>",0);
        btn1.setTypeface(typeFace);
        //Typeface.setDefault(typeFace);
      }
    });
  }
}</span></span></span>

第二种使用方法：xml中使用

res/values/styles.xml

<span style="font-size:14px;">    <style name="app">
    <item name="android:typeface">NotoSansCJKjp</item>
    <item name="android:textStyle">bold</item>
    </style></span>

res/layout/activity_main.xml

<span style="font-size:14px;">                <TextView
                    android:id="@+id/appName"
                    style="@style/app" /></span>

二、开发板中位置

/system/etc/system_fonts.xml

/system/etc/fallback_fonts.xml 

/system/etc/fonts.xml（Android5.0兼容上处两个xml）

/system/fonts/

三、系统默认字体

DroidSans.ttf是默认英文字库；DroidSans-Bold.ttf是默认英文粗体字库；DroidSansFallback.ttf是默认中文字库。

四、其他相关目录

1.系统资源文件

frameworks/base/core/res/res/values/attrs.xml

<span style="font-size:14px;">    <attr name="typeface">
        <enum name="normal" value="0" />
        <enum name="sans" value="1" />
        <enum name="serif" value="2" />
        <enum name="monospace" value="3" />
        <!--add by tank-->
        <enum name="NotoSansCJKjp" value="4" />
        <enum name="NotoSansCJKkr" value="5" />
        <enum name="NotoSansCJKsc" value="6" />
        <enum name="NotoSansCJKtc" value="7" />
        <!--end tank-->
    </attr>
//////
    <attr name="textStyle">
        <flag name="normal" value="0" />
        <flag name="bold" value="1" />
        <flag name="italic" value="2" />
    </attr></span>

2.frameworks/base/graphics/java/android/graphics/Typeface.java

<span style="font-size:14px;">    public static final Typeface SANS_SERIF;
    /** The NORMAL style of the default serif typeface. */
    public static final Typeface SERIF;
    /** The NORMAL style of the default monospace typeface. */
    public static final Typeface MONOSPACE;
    //add by tank
    public static final Typeface NotoSansCJKjp;
    public static final Typeface NotoSansCJKkr;
    public static final Typeface NotoSansCJKsc;
    public static final Typeface NotoSansCJKtc;
    //end tank
        SANS_SERIF      = create("sans-serif", 0);
        SERIF           = create("serif", 0);
        MONOSPACE       = create("monospace", 0);
        //add by tank
        NotoSansCJKjp      = create("NotoSansCJKjp", 0);
        NotoSansCJKkr           = create("NotoSansCJKkr", 0);
        NotoSansCJKsc       = create("NotoSansCJKsc", 0);
        NotoSansCJKtc       = create("NotoSansCJKtc", 0);       
        //end tank</span>

3.frameworks/base/core/java/android/widget/TextView.java

<span style="font-size:14px;">    private static final int SANS = 1;
    private static final int SERIF = 2;
    private static final int MONOSPACE = 3;
    //add by tank
    private static final int NotoSansCJKjp = 4;
    private static final int NotoSansCJKkr = 5;
    private static final int NotoSansCJKsc = 6;
    private static final int NotoSansCJKtc = 7;
    //end tank
    private void setTypefaceFromAttrs(String familyName, int typefaceIndex, int styleIndex) {
        Typeface tf = null;
        if (familyName != null) {
            tf = Typeface.create(familyName, styleIndex);
            if (tf != null) {
                setTypeface(tf);
                return;
            }
        }
        switch (typefaceIndex) {
            case SANS:
                tf = Typeface.SANS_SERIF;
                break;

            case SERIF:
                tf = Typeface.SERIF;
                break;

            case MONOSPACE:
                tf = Typeface.MONOSPACE;
                break;
 
            //add by tank
            case NotoSansCJKjp:
                tf = Typeface.NotoSansCJKjp;
                break;

            case NotoSansCJKkr:
                tf = Typeface.NotoSansCJKkr;
                break;

            case NotoSansCJKsc:
                tf = Typeface.NotoSansCJKsc;
                break;

            case NotoSansCJKtc:
                tf = Typeface.NotoSansCJKtc;
                break;
            //end tank
        }

        setTypeface(tf, styleIndex);
    }</span>

4.external/skia/include/ports/SkFontStyle.h

<span style="font-size:14px;">    enum Weight {
        kThin_Weight        = 100,
        kExtraLight_Weight  = 200,
        kLight_Weight       = 300,
        kNormal_Weight      = 400,
        kMedium_Weight      = 500,
        kSemiBold_Weight    = 600,
        kBold_Weight        = 700,
        kExtraBold_Weight   = 800,
        kBlack_Weight       = 900
    };</span>