Android：想要为整个应用程序而不是运行时设置自定义字体

时间：2010-12-09 05:56:34

标签： android fonts textview android-fonts

是否可以在应用程序的每个控件中设置任何自定义字体？而不一定是运行时？ （即，如果可能的话，从xml中获取，或者在JAVA文件中仅用于整个应用程序一次）

我可以从这段代码中为一个控件设置字体。

public static void setFont(TextView textView) {
    Typeface tf = Typeface.createFromAsset(textView.getContext()
            .getAssets(), "fonts/BPreplay.otf");

    textView.setTypeface(tf);

}

这段代码的问题是应该为每个控件调用它。我想一次调用这个或任何类似的方法，或者如果可能的话，在xml中设置属性。有可能吗？

11 个答案:

答案 0 :(得分：121)

编辑：所以已经有一段时间了，我想添加一些我认为最好的方法来做到这一点，并且通过XML不会少！

首先，您将要创建一个新类，该类将覆盖您要自定义的View。 （例如，想要一个带有自定义字体的按钮？扩展Button）。让我们举个例子：

public class CustomButton extends Button {
    private final static int ROBOTO = 0;
    private final static int ROBOTO_CONDENSED = 1;

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

    public CustomButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        parseAttributes(context, attrs); //I'll explain this method later
    }

    public CustomButton(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        parseAttributes(context, attrs);
    }
}

现在，如果您没有，请在res/values/attrs.xml下添加XML文档，然后添加：

<resources>
    <!-- Define the values for the attribute -->
    <attr name="typeface" format="enum">
        <enum name="roboto" value="0"/>
        <enum name="robotoCondensed" value="1"/>
    </attr>

    <!-- Tell Android that the class "CustomButton" can be styled, 
         and which attributes it supports -->
    <declare-styleable name="CustomButton">
        <attr name="typeface"/>
    </declare-styleable>
</resources>

好的，这样就可以了，让我们回到之前的parseAttributes()方法：

private void parseAttributes(Context context, AttributeSet attrs) {
    TypedArray values = context.obtainStyledAttributes(attrs, R.styleable.CustomButton);

    //The value 0 is a default, but shouldn't ever be used since the attr is an enum
    int typeface = values.getInt(R.styleable.CustomButton_typeface, 0);

    switch(typeface) {
        case ROBOTO: default:
            //You can instantiate your typeface anywhere, I would suggest as a 
            //singleton somewhere to avoid unnecessary copies
            setTypeface(roboto); 
            break;
        case ROBOTO_CONDENSED:
            setTypeface(robotoCondensed);
            break;
    }

    values.recycle();
}

现在你已经准备好了。您可以为任何事物添加更多属性（您可以为typefaceStyle添加另一个属性 - 粗体，斜体等），但现在让我们看看如何使用它：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:custom="http://schemas.android.com/apk/res/com.yourpackage.name"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <com.yourpackage.name.CustomButton
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Click Me!"
        custom:typeface="roboto" />

</LinearLayout>

xmlns:custom行确实可以是任何东西，但约定如上所示。重要的是它是独一无二的，这就是使用包名的原因。现在，您只需使用custom:前缀作为属性，使用android:前缀作为android属性。

最后一件事：如果你想在一种风格（res/values/styles.xml）中使用它，你应该不添加xmlns:custom行。只需引用没有前缀的属性名称：

<style name="MyStyle>
    <item name="typeface">roboto</item>
</style>

                               (PREVIOUS ANSWER)

Using a custom typeface in Android

这应该有所帮助。基本上，在XML中没有办法做到这一点，据我所知，在代码中没有更简单的方法。您可以始终使用setLayoutFont（）方法创建一次字体，然后为每个字体运行setTypeface（）。每次向布局添加新项时，都必须更新它。如下所示：

public void setLayoutFont() {
    Typeface tf = Typeface.createFromAsset(
        getBaseContext().getAssets(), "fonts/BPreplay.otf");
    TextView tv1 = (TextView)findViewById(R.id.tv1);
    tv1.setTypeface(tf);

    TextView tv2 = (TextView)findViewById(R.id.tv2);
    tv2.setTypeface(tf);

    TextView tv3 = (TextView)findViewById(R.id.tv3);
    tv3.setTypeface(tf);
}

编辑：所以我自己就这样实现了类似的东西，以及我最终是如何做到这样的功能：

public static void setLayoutFont(Typeface tf, TextView...params) {
    for (TextView tv : params) {
        tv.setTypeface(tf);
    }
}

然后，只需在onCreate（）中使用此方法，并传递要更新的所有TextView：

Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/BPreplay.otf");
//find views by id...
setLayoutFont(tf, tv1, tv2, tv3, tv4, tv5);

编辑9/5/12：

因此，由于这仍然是获得观点和投票，我想添加一个更好，更完整的方法：

Typeface mFont = Typeface.createFromAsset(getAssets(), "fonts/BPreplay.otf");
ViewGroup root = (ViewGroup)findViewById(R.id.myrootlayout);
setFont(root, mFont);

/*
 * Sets the font on all TextViews in the ViewGroup. Searches
 * recursively for all inner ViewGroups as well. Just add a
 * check for any other views you want to set as well (EditText,
 * etc.)
 */
public void setFont(ViewGroup group, Typeface font) {
    int count = group.getChildCount();
    View v;
    for(int i = 0; i < count; i++) {
        v = group.getChildAt(i);
        if(v instanceof TextView || v instanceof Button /*etc.*/)
            ((TextView)v).setTypeface(font);
        else if(v instanceof ViewGroup)
            setFont((ViewGroup)v, font);
    }
}

如果您将布局的根目录传递给它，它将递归检查该布局中的TextView或Button个视图（或您添加到该if语句的任何其他视图），并设置你必须按ID指定它们。当然，这是假设您要将字体设置为每个视图。

答案 1 :(得分：90)

通过XML可以很容易地做到这一点。您只需要创建自己的扩展TextView的小部件。

首先，在res / values / attrs.xml中创建一个文件，其中包含以下内容：

<resources>
    <declare-styleable name="TypefacedTextView">
        <attr name="typeface" format="string" />
    </declare-styleable>
</resources>

之后，创建自定义小部件：

package your.package.widget;

public class TypefacedTextView extends TextView {

    public TypefacedTextView(Context context, AttributeSet attrs) {
        super(context, attrs);

        //Typeface.createFromAsset doesn't work in the layout editor. Skipping...
        if (isInEditMode()) {
            return;
        }

        TypedArray styledAttrs = context.obtainStyledAttributes(attrs, R.styleable.TypefacedTextView);
        String fontName = styledAttrs.getString(R.styleable.TypefacedTextView_typeface);
        styledAttrs.recycle();

        if (fontName != null) {
            Typeface typeface = Typeface.createFromAsset(context.getAssets(), fontName);
            setTypeface(typeface);
        }
    }

}

如您所见，上面的代码将读取assets /文件夹中的字体。对于此示例，我假设assets文件夹中有一个名为“custom.ttf”的文件。最后，使用XML中的小部件：

<your.package.widget.TypefacedTextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:your_namespace="http://schemas.android.com/apk/res/your.package"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Custom fonts in XML are easy"
    android:textColor="#FFF"
    android:textSize="14dip"
    your_namespace:typeface="custom.ttf" />

注意：您将无法在Eclipse的布局编辑器中看到自定义字体。这就是我进行isInEditMode()检查的原因。但是，如果你运行你的应用程序，自定义字体将像魅力一样工作。

希望它有所帮助！

答案 2 :(得分：15)

带有roboto字体的TextView示例：

attr.xml 

<?xml version="1.0" encoding="utf-8"?>
<resources>

<declare-styleable name="RobotoTextView">
    <attr name="typeface"/>
</declare-styleable>

<attr name="typeface" format="enum">
    <enum name="roboto_thin" value="0"/>
    <enum name="roboto_thin_italic" value="1"/>
    <enum name="roboto_light" value="2"/>
    <enum name="roboto_light_italic" value="3"/>
    <enum name="roboto_regular" value="4"/>
    <enum name="roboto_italic" value="5"/>
    <enum name="roboto_medium" value="6"/>
    <enum name="roboto_medium_italic" value="7"/>
    <enum name="roboto_bold" value="8"/>
    <enum name="roboto_bold_italic" value="9"/>
    <enum name="roboto_black" value="10"/>
    <enum name="roboto_black_italic" value="11"/>
    <enum name="roboto_condensed" value="12"/>
    <enum name="roboto_condensed_italic" value="13"/>
    <enum name="roboto_condensed_bold" value="14"/>
    <enum name="roboto_condensed_bold_italic" value="15"/>
</attr>

</resources>

RobotoTextView.java：

public class RobotoTextView extends TextView {

/*
 * Permissible values ​​for the "typeface" attribute.
 */
private final static int ROBOTO_THIN = 0;
private final static int ROBOTO_THIN_ITALIC = 1;
private final static int ROBOTO_LIGHT = 2;
private final static int ROBOTO_LIGHT_ITALIC = 3;
private final static int ROBOTO_REGULAR = 4;
private final static int ROBOTO_ITALIC = 5;
private final static int ROBOTO_MEDIUM = 6;
private final static int ROBOTO_MEDIUM_ITALIC = 7;
private final static int ROBOTO_BOLD = 8;
private final static int ROBOTO_BOLD_ITALIC = 9;
private final static int ROBOTO_BLACK = 10;
private final static int ROBOTO_BLACK_ITALIC = 11;
private final static int ROBOTO_CONDENSED = 12;
private final static int ROBOTO_CONDENSED_ITALIC = 13;
private final static int ROBOTO_CONDENSED_BOLD = 14;
private final static int ROBOTO_CONDENSED_BOLD_ITALIC = 15;
/**
 * List of created typefaces for later reused.
 */
private final static SparseArray<Typeface> mTypefaces = new SparseArray<Typeface>(16);

/**
 * Simple constructor to use when creating a view from code.
 *
 * @param context The Context the view is running in, through which it can
 *                access the current theme, resources, etc.
 */
public RobotoTextView(Context context) {
    super(context);
}

/**
 * Constructor that is called when inflating a view from XML. This is called
 * when a view is being constructed from an XML file, supplying attributes
 * that were specified in the XML file. This version uses a default style of
 * 0, so the only attribute values applied are those in the Context's Theme
 * and the given AttributeSet.
 * <p/>
 * <p/>
 * The method onFinishInflate() will be called after all children have been
 * added.
 *
 * @param context The Context the view is running in, through which it can
 *                access the current theme, resources, etc.
 * @param attrs   The attributes of the XML tag that is inflating the view.
 * @see #RobotoTextView(Context, AttributeSet, int)
 */
public RobotoTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
    parseAttributes(context, attrs);
}

/**
 * Perform inflation from XML and apply a class-specific base style. This
 * constructor of View allows subclasses to use their own base style when
 * they are inflating.
 *
 * @param context  The Context the view is running in, through which it can
 *                 access the current theme, resources, etc.
 * @param attrs    The attributes of the XML tag that is inflating the view.
 * @param defStyle The default style to apply to this view. If 0, no style
 *                 will be applied (beyond what is included in the theme). This may
 *                 either be an attribute resource, whose value will be retrieved
 *                 from the current theme, or an explicit style resource.
 * @see #RobotoTextView(Context, AttributeSet)
 */
public RobotoTextView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    parseAttributes(context, attrs);
}

/**
 * Parse the attributes.
 *
 * @param context The Context the view is running in, through which it can access the current theme, resources, etc.
 * @param attrs   The attributes of the XML tag that is inflating the view.
 */
private void parseAttributes(Context context, AttributeSet attrs) {
    TypedArray values = context.obtainStyledAttributes(attrs, R.styleable.RobotoTextView);

    int typefaceValue = values.getInt(R.styleable.RobotoTextView_typeface, 0);
    values.recycle();

    setTypeface(obtaintTypeface(context, typefaceValue));
}

/**
 * Obtain typeface.
 *
 * @param context       The Context the view is running in, through which it can
 *                      access the current theme, resources, etc.
 * @param typefaceValue values ​​for the "typeface" attribute
 * @return Roboto {@link Typeface}
 * @throws IllegalArgumentException if unknown `typeface` attribute value.
 */
private Typeface obtaintTypeface(Context context, int typefaceValue) throws IllegalArgumentException {
    Typeface typeface = mTypefaces.get(typefaceValue);
    if (typeface == null) {
        typeface = createTypeface(context, typefaceValue);
        mTypefaces.put(typefaceValue, typeface);
    }
    return typeface;
}

/**
 * Create typeface from assets.
 *
 * @param context       The Context the view is running in, through which it can
 *                      access the current theme, resources, etc.
 * @param typefaceValue values ​​for the "typeface" attribute
 * @return Roboto {@link Typeface}
 * @throws IllegalArgumentException if unknown `typeface` attribute value.
 */
private Typeface createTypeface(Context context, int typefaceValue) throws IllegalArgumentException {
    Typeface typeface;
    switch (typefaceValue) {
        case ROBOTO_THIN:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-Thin.ttf");
            break;
        case ROBOTO_THIN_ITALIC:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-ThinItalic.ttf");
            break;
        case ROBOTO_LIGHT:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-Light.ttf");
            break;
        case ROBOTO_LIGHT_ITALIC:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-LightItalic.ttf");
            break;
        case ROBOTO_REGULAR:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-Regular.ttf");
            break;
        case ROBOTO_ITALIC:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-Italic.ttf");
            break;
        case ROBOTO_MEDIUM:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-Medium.ttf");
            break;
        case ROBOTO_MEDIUM_ITALIC:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-MediumItalic.ttf");
            break;
        case ROBOTO_BOLD:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-Bold.ttf");
            break;
        case ROBOTO_BOLD_ITALIC:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-BoldItalic.ttf");
            break;
        case ROBOTO_BLACK:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-Black.ttf");
            break;
        case ROBOTO_BLACK_ITALIC:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-BlackItalic.ttf");
            break;
        case ROBOTO_CONDENSED:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-Condensed.ttf");
            break;
        case ROBOTO_CONDENSED_ITALIC:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-CondensedItalic.ttf");
            break;
        case ROBOTO_CONDENSED_BOLD:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-BoldCondensed.ttf");
            break;
        case ROBOTO_CONDENSED_BOLD_ITALIC:
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/Roboto-BoldCondensedItalic.ttf");
            break;
        default:
            throw new IllegalArgumentException("Unknown `typeface` attribute value " + typefaceValue);
    }
    return typeface;
}

}

使用示例：

<your.package.widget.RobotoTextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                app:typeface="roboto_thin"
                android:textSize="22sp"
                android:text="Roboto Thin"/>

资源： Roboto & Noto fonts

答案 3 :(得分：3)

现在为时已晚，但我帮助其他人 我创建了CustomTextView，它有一个名为typeFace的属性，它关心的是没有缓存的字体加载的内存泄漏问题

首先是Fonts类，它只从资源加载字体一次

 import android.content.Context;
import android.graphics.Typeface;

import java.util.Hashtable;

/**
 * Created by tonyhaddad on 7/19/15.
 */
public class Fonts {
    private Context context;

    public Fonts(Context context) {
        this.context = context;
    }
    private static Hashtable<String, Typeface> sTypeFaces = new Hashtable<String, Typeface>(
            4);
    public static Typeface getTypeFace(Context context, String fileName) {
        Typeface tempTypeface = sTypeFaces.get(fileName);

        if (tempTypeface == null) {
            String fontPath=null;
            if(fileName=="metabold")
                fontPath ="fonts/Meta-Bold.ttf";

            else if(fileName=="metanormal")
                fontPath="fonts/Meta-Normal.ttf";
            else if(fileName=="gsligh")
                fontPath="fonts/gesslight.ttf";
            else if(fileName=="bold")
                fontPath="fonts/Lato-Bold.ttf";
            else if(fileName=="rcr")
                fontPath="fonts/RobotoCondensed-Regular.ttf";

            else if(fileName=="mpr")
                fontPath="fonts/MyriadPro-Regular.otf";
            else if(fileName=="rr")
                fontPath="fonts/Roboto-Regular.ttf";

            tempTypeface = Typeface.createFromAsset(context.getAssets(), fontPath);
            sTypeFaces.put(fileName, tempTypeface);
        }

        return tempTypeface;
    }
}

然后你需要在attrs.xml中添加一个自定义属性添加这个

<declare-styleable name="CustomFontTextView">
        <attr name="typeFace" format="string" />

    </declare-styleable>

然后自定义类

 package package_name;

/**
 * Created by tonyhaddad on 8/26/15.
 */

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.TextView;

import package_name.R;

public class CustomFontTextView extends TextView {

    String typeFace;


    public CustomFontTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        if (isInEditMode()) {
            return;
        }
        TypedArray a = context.getTheme().obtainStyledAttributes(
                attrs,
                R.styleable.CustomFontTextView,
                0, 0);
        try {
            typeFace = a.getString(0);
        } finally {
            a.recycle();
        }

        if(typeFace!=null && !typeFace.equalsIgnoreCase(""))
        {
            Typeface tf = Fonts.getTypeFace(context, typeFace);
            setTypeface(tf);
        }
        init();
    }

    public CustomFontTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        if (isInEditMode()) {
            return;
        }
        TypedArray a = context.getTheme().obtainStyledAttributes(
                attrs,
                R.styleable.CustomFontTextView,
                0, 0);
        try {
            typeFace = a.getString(0);
        } finally {
            a.recycle();
        }

        if(typeFace!=null && !typeFace.equalsIgnoreCase(""))
        {
            Typeface tf = Fonts.getTypeFace(context, typeFace);
            setTypeface(tf);
        }

        init();
    }

    public CustomFontTextView(Context context) {
        super(context);



        if(typeFace!=null && !typeFace.equalsIgnoreCase(""))
        {
            Typeface tf = Fonts.getTypeFace(context, typeFace);
            setTypeface(tf);
        }
        init();
    }


    private void init() {

    }

    public String getTypeFace() {
        return typeFace;
    }

    public void setTypeFace(String typeFace) {
        this.typeFace = typeFace;
        invalidate();
        requestLayout();
    }
}

最后添加文本视图

  <package_name.CustomFontTextView
            xmlns:custom="http://schemas.android.com/apk/res-auto/package_name"
            android:id="@+id/txt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="41dp"
            android:gravity="center_vertical"
            android:text="text"
            android:textColor="#000"
            android:textSize="23sp"
            custom:typeFace="metanormal"/>

您可以使用setTypeFace方法更改字体progrmaticlly 如果要在此视图中使用多个命名空间，也可以将自定义命名空间移动到父布局

快乐编码：）

答案 4 :(得分：2)

下面的方法，在onCreate（）中调用并传递到最外面的ViewGroup，除了动态创建的文本（即动态列表，警报等）之外，它将适用于所有内容。获取最外层ViewGroup的一种简单方法是在任何一个视图上使用getRootView。

public void onCreate(Bundle savedInstanceState){
    //onCreate code...
    EditText text = (EditText) findViewById(R.id.editText1);
    setTypeFaceForViewGroup((ViewGroup) text.getRootView());
}

private void setTypeFaceForViewGroup(ViewGroup vg){

    for (int i = 0; i < vg.getChildCount(); i++) {

            if (vg.getChildAt(i) instanceof ViewGroup)
                setTypeFaceForViewGroup((ViewGroup) vg.getChildAt(i));

            else if (vg.getChildAt(i) instanceof TextView)
                ((TextView) vg.getChildAt(i)).setTypeface(Typeface.createFromAsset(getAssets(), "fonts/Your_Font.ttf"));

    }

}

这也应该适用于动态内容，你只需要在创建之后调用它，传入你创建的任何东西（尽管我还没有测试过）。

为了节省内存，您可能希望将字体设置为静态变量，而不是像每次循环一样创建一个新变量。

答案 5 :(得分：2)

如果您正在寻找更通用的编程解决方案，我创建了一个静态类，可用于设置整个视图的字体（Activity UI）。请注意，我正在使用Mono（C＃），但您可以使用Java轻松实现它。

您可以将此类传递给您要自定义的布局或特定视图。如果你想要超高效，可以使用Singleton模式实现它。

public static class AndroidTypefaceUtility 
{
    static AndroidTypefaceUtility()
    {
    }
    //Refer to the code block beneath this one, to see how to create a typeface.
    public static void SetTypefaceOfView(View view, Typeface customTypeface)
    {
    if (customTypeface != null && view != null)
    {
            try
            {
                if (view is TextView)
                    (view as TextView).Typeface = customTypeface;
                else if (view is Button)
                    (view as Button).Typeface = customTypeface;
                else if (view is EditText)
                    (view as EditText).Typeface = customTypeface;
                else if (view is ViewGroup)
                    SetTypefaceOfViewGroup((view as ViewGroup), customTypeface);
                else
                    Console.Error.WriteLine("AndroidTypefaceUtility: {0} is type of {1} and does not have a typeface property", view.Id, typeof(View));
                }
                catch (Exception ex)
                {
                    Console.Error.WriteLine("AndroidTypefaceUtility threw:\n{0}\n{1}", ex.GetType(), ex.StackTrace);
                    throw ex;
                }
            }
            else
            {
                Console.Error.WriteLine("AndroidTypefaceUtility: customTypeface / view parameter should not be null");
            }
        }

        public static void SetTypefaceOfViewGroup(ViewGroup layout, Typeface customTypeface)
        {
            if (customTypeface != null && layout != null)
            {
                for (int i = 0; i < layout.ChildCount; i++)
                {
                    SetTypefaceOfView(layout.GetChildAt(i), customTypeface);
                }
            }
            else
            {
                Console.Error.WriteLine("AndroidTypefaceUtility: customTypeface / layout parameter should not be null");
            }
        }

    }

在您的活动中，您需要创建一个Typeface对象。我使用放在我的Resources / Assets /目录中的.ttf文件在OnCreate（）中创建我的。确保该文件在其“＆＃39;中标记为Android资产。属性。

protected override void OnCreate(Bundle bundle)
{               
    ...
    LinearLayout rootLayout = (LinearLayout)FindViewById<LinearLayout>(Resource.Id.signInView_LinearLayout);
    Typeface allerTypeface = Typeface.CreateFromAsset(base.Assets,"Aller_Rg.ttf");
    AndroidTypefaceUtility.SetTypefaceOfViewGroup(rootLayout, allerTypeface);
}

答案 6 :(得分：2)

不幸的是，Android并没有提供快速，简单和干净的方式来改变整个应用的字体。但是最近我调查了这个问题并创建了一些工具，允许你在没有任何编码的情况下更改字体（你可以通过xml，样式甚至文本外观来完成）。它们基于类似于您在其他答案中看到的类似解决方案，但允许更大的灵活性。您可以在this blog上阅读所有相关内容，并查看github项目here。

以下是如何应用这些工具的示例。将所有字体文件放在assets/fonts/中。然后，在xml文件中声明这些字体（例如res/xml/fonts.xml），并使用TypefaceManager.initialize(this, R.xml.fonts);在应用程序的早期加载此文件（例如，在Application类的onCreate中）。 xml文件如下所示：

<?xml version="1.0" encoding="utf-8"?>
<familyset>

    <!-- Some Font. Can be referenced with 'someFont' or 'aspergit' -->
    <family>
        <nameset>
            <name>aspergit</name>
            <name>someFont</name>
        </nameset>
        <fileset>
            <file>Aspergit.ttf</file>
            <file>Aspergit Bold.ttf</file>
            <file>Aspergit Italic.ttf</file>
            <file>Aspergit Bold Italic.ttf</file>
        </fileset>
    </family>

    <!-- Another Font. Can be referenced with 'anotherFont' or 'bodoni' -->
    <family>
        <nameset>
            <name>bodoni</name>
            <name>anotherFont</name>
        </nameset>
        <fileset>
            <file>BodoniFLF-Roman.ttf</file>
            <file>BodoniFLF-Bold.ttf</file>
        </fileset>
    </family>

</familyset>

现在，您可以在xml布局中使用自定义UI元素com.innovattic.font.FontTextView，在样式或xml中使用这些字体（假设您使用我上面提到的工具）。您可以在下面看到如何通过编辑res/values/styles.xml来为整个应用中的所有文字应用字体：

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">

    <!-- Application theme -->
    <!-- Use a different parent if you don't want Holo Light -->
    <style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">
        <item name="android:textViewStyle">@style/MyTextViewStyle</item>
    </style>

    <!-- Style to use for ALL text views (including FontTextView) -->
    <!-- Use a different parent if you don't want Holo Light -->
    <style name="MyTextViewStyle" parent="@android:style/Widget.Holo.Light.TextView">
        <item name="android:textAppearance">@style/MyTextAppearance</item>
    </style>

    <!-- Text appearance to use for ALL text views (including FontTextView) -->
    <!-- Use a different parent if you don't want Holo Light -->
    <style name="MyTextAppearance" parent="@android:style/TextAppearance.Holo">
        <!-- Alternatively, reference this font with the name "aspergit" -->
        <!-- Note that only our own TextView's will use the font attribute -->
        <item name="flFont">someFont</item>
        <item name="android:textStyle">bold|italic</item>
    </style>

    <!-- Alternative style, maybe for some other widget -->
    <style name="StylishFont">
        <item name="flFont">anotherFont</item>
        <item name="android:textStyle">normal</item>
    </style>

</resources>

随附res/layout/layout.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <!-- This text view is styled with the app theme -->
    <com.innovattic.font.FontTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This uses my font in bold italic style" />

    <!-- This text view is styled here and overrides the app theme -->
    <com.innovattic.font.FontTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:flFont="anotherFont"
        android:textStyle="normal"
        android:text="This uses another font in normal style" />

    <!-- This text view is styled with a style and overrides the app theme -->
    <com.innovattic.font.FontTextView
        style="@style/StylishFont"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This also uses another font in normal style" />

</LinearLayout>

不要忘记在Android清单中应用主题。

答案 7 :(得分：2)

我想在leocadiotine的伟大解决方案中添加一条注释。它是完美的，但是当使用这个Custom TextView时，很多时候会减慢应用程序的速度，因为每次创建textview时它都必须访问资产。我建议在View Holder pattern中使用类似Adapters的内容，我写了一个例子：

public class Fonts {

    private static final Map<String, Typeface> typefaces = new HashMap<String, Typeface>();

    public static Typeface getTypeface(Context ctx, String fontName) {
        Typeface typeface = typefaces.get(fontName);
        if (typeface == null) {
            typeface = Typeface.createFromAsset(ctx.getAssets(), fontName);
            typefaces.put(fontName, typeface);
        }
        return typeface;
    } 
}

通过这种方式，应用程序每个资产只访问资产一次，并将它们保存在内存中以满足其他需求。

答案 8 :(得分：0)

我不知道它是否会改变整个应用程序，但我设法改变了一些无法通过这样做改变的组件：

Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/Lucida Sans Unicode.ttf");
Typeface.class.getField("DEFAULT").setAccessible(true);
Typeface.class.getField("DEFAULT_BOLD").setAccessible(true);
Typeface.class.getField("DEFAULT").set(null, tf);
Typeface.class.getField("DEFAULT_BOLD").set(null, tf);

答案 9 :(得分：0)

我在此链接中找到了分步信息，链接：https://github.com/jaydipumaretiya/CustomTypeface/

在android中有很多方法可以正确使用字体，你必须把你的字体文件放入 您的主要资源文件夹直接可以使用它运行时。

其他最简单的方法是使用默认库在xml文件中设置字体。  我更喜欢这个自定义字体库将字体设置为TextView，EditText，Button，CheckBox，  Android中的RadioButton和AutoCompleteTextView以及其他wedget。

答案 10 :(得分：0)

Android 8.0（API级别26）引入了一项新功能，即XML中的字体。您可以创建fontfamily文件并在styles.xml中进行设置。

  

要将字体添加为资源，请在Android中执行以下步骤   工作室：

     

1.右键单击res文件夹，然后转到新建＆gt; Android资源目录。将出现“新资源目录”窗口。

     

2.在“资源类型”列表中，选择“字体”，然后单击“确定”。注意：资源目录的名称必须是font。

     

3.在字体文件夹中添加字体文件。

     

要创建字体系列，请执行以下步骤：

     

1.右键单击字体文件夹，然后转到新建＆gt;字体资源文件。将出现“新建资源文件”窗口。

     

2.输入文件名，然后单击“确定”。新的字体资源XML在编辑器中打开。

     

3.包含元素中的每个字体文件，样式和权重属性。以下XML说明了添加与字体相关的属性   在字体资源XML中：

<?xml version="1.0" encoding="utf-8"?>
<font-family xmlns:android="http://schemas.android.com/apk/res/android">
    <font
        android:fontStyle="normal"
        android:fontWeight="400"
        android:font="@font/lobster_regular" />
    <font
        android:fontStyle="italic"
        android:fontWeight="400"
        android:font="@font/lobster_italic" />
</font-family>
     

将字体添加到样式

     

打开styles.xml，并将fontFamily属性设置为字体文件   你想要访问。

 <style name="customfontstyle" parent="@android:style/TextAppearance.Small">
    <item name="android:fontFamily">@font/lobster</item>
</style>

来源：Fonts in XML

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