我需要使用特定的字体为我的整个应用程序。我有。ttf文件相同。 是否有可能将此设置为默认字体,在应用程序启动,然后在应用程序的其他地方使用它?当设置,我如何使用它在我的布局xml ?


当前回答

对于Android O,现在可以直接从XML中定义,我的bug现在已经关闭!

详情请看这里

TL; diana:

首先,必须将字体添加到项目中

其次,添加一个字体系列,如下所示:

<?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>

最后,您可以在布局或样式中使用字体:

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fontFamily="@font/lobster"/>

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

享受吧!

其他回答

总而言之:

选项1:使用反射来应用字体(结合weston和Roger Huang的回答):

import java.lang.reflect.Field;
import android.content.Context;
import android.graphics.Typeface;

public final class FontsOverride { 

    public static void setDefaultFont(Context context,
            String staticTypefaceFieldName, String fontAssetName) {
        final Typeface regular = Typeface.createFromAsset(context.getAssets(),
                fontAssetName);
        replaceFont(staticTypefaceFieldName, regular);
    } 

    protected static void replaceFont(String staticTypefaceFieldName,final Typeface newTypeface) {
        if (isVersionGreaterOrEqualToLollipop()) {
            Map<String, Typeface> newMap = new HashMap<String, Typeface>();
            newMap.put("sans-serif", newTypeface);
            try {
                final Field staticField = Typeface.class.getDeclaredField("sSystemFontMap");
                staticField.setAccessible(true);
                staticField.set(null, newMap);
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        } else {
            try {
                final Field staticField = Typeface.class.getDeclaredField(staticTypefaceFieldName);
                staticField.setAccessible(true);
                staticField.set(null, newTypeface);
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } 
        }
    }

} 

应用类使用:

public final class Application extends android.app.Application {
    @Override 
    public void onCreate() { 
        super.onCreate(); 
        FontsOverride.setDefaultFont(this, "DEFAULT", "MyFontAsset.ttf");
        FontsOverride.setDefaultFont(this, "MONOSPACE", "MyFontAsset2.ttf");
        FontsOverride.setDefaultFont(this, "SERIF", "MyFontAsset3.ttf");
        FontsOverride.setDefaultFont(this, "SANS_SERIF", "MyFontAsset4.ttf");
    } 
} 

设置一个样式来强制字体应用程序宽(基于lovefish):

Pre-Lollipop:

<resources>
    <style name="AppBaseTheme" parent="Theme.AppCompat.Light">
    </style>

   <!-- Application theme. -->
   <style name="AppTheme" parent="AppBaseTheme">
       <item name="android:typeface">monospace</item>
   </style>
</resources>

棒棒糖(21火):

<resources>
    <style name="AppBaseTheme" parent="Theme.AppCompat.Light">
    </style>

   <!-- Application theme. -->
   <style name="AppTheme" parent="AppBaseTheme">
       <item name="android:textAppearance">@style/CustomTextAppearance</item>
   </style>

   <style name="CustomTextAppearance">
       <item name="android:typeface">monospace</item>
   </style>
</resources>

选项2:子类每个和每个视图,你需要自定义字体,即。ListView, EditTextView, Button等(Palani的答案):

public class CustomFontView extends TextView {

public CustomFontView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init(); 
} 

public CustomFontView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init(); 
} 

public CustomFontView(Context context) {
    super(context);
    init(); 
} 

private void init() { 
    if (!isInEditMode()) {
        Typeface tf = Typeface.createFromAsset(getContext().getAssets(), "Futura.ttf");
        setTypeface(tf);
    } 
} 

选项3:实现一个视图爬虫,遍历当前屏幕的视图层次结构:

变体#1(汤姆的回答):

public static final void setAppFont(ViewGroup mContainer, Typeface mFont, boolean reflect)
{ 
    if (mContainer == null || mFont == null) return;

    final int mCount = mContainer.getChildCount();

    // Loop through all of the children. 
    for (int i = 0; i < mCount; ++i)
    { 
        final View mChild = mContainer.getChildAt(i);
        if (mChild instanceof TextView)
        { 
            // Set the font if it is a TextView. 
            ((TextView) mChild).setTypeface(mFont);
        } 
        else if (mChild instanceof ViewGroup)
        { 
            // Recursively attempt another ViewGroup. 
            setAppFont((ViewGroup) mChild, mFont);
        } 
        else if (reflect)
        { 
            try { 
                Method mSetTypeface = mChild.getClass().getMethod("setTypeface", Typeface.class);
                mSetTypeface.invoke(mChild, mFont); 
            } catch (Exception e) { /* Do something... */ }
        } 
    } 
} 

用法:

final ViewGroup mContainer = (ViewGroup) findViewById(
android.R.id.content).getRootView();
HomeActivity.setAppFont(mContainer, Typeface.createFromAsset(getAssets(),
"fonts/MyFont.ttf"));

变化# 2:https://coderwall.com/p/qxxmaa/android-use-a-custom-font-everywhere。

选项#4:使用称为书法的第三方自由。

就我个人而言,我会推荐选项4,因为它省去了很多麻烦。

我还建议扩展TextView和其他控件,但我认为在结构中设置字体会更好。

public FontTextView(Context context) {
    super(context);
    init();
}

public FontTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}

public FontTextView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
}

protected void init() {
    setTypeface(Typeface.createFromAsset(getContext().getAssets(), AppConst.FONT));
}

Tom的解决方案很好,但只适用于TextView和EditText。

如果你想覆盖大部分的视图(RadioGroup, TextView,复选框…),我创建了一个方法:

protected void changeChildrenFont(ViewGroup v, Typeface font){
    for(int i = 0; i < v.getChildCount(); i++){

        // For the ViewGroup, we'll have to use recursivity
        if(v.getChildAt(i) instanceof ViewGroup){
            changeChildrenFont((ViewGroup) v.getChildAt(i), font);
        }
        else{
            try {
                Object[] nullArgs = null;
                //Test wether setTypeface and getTypeface methods exists
                Method methodTypeFace = v.getChildAt(i).getClass().getMethod("setTypeface", new Class[] {Typeface.class, Integer.TYPE});
                //With getTypefaca we'll get back the style (Bold, Italic...) set in XML
                Method methodGetTypeFace = v.getChildAt(i).getClass().getMethod("getTypeface", new Class[] {});
                Typeface typeFace = ((Typeface)methodGetTypeFace.invoke(v.getChildAt(i), nullArgs));
                //Invoke the method and apply the new font with the defined style to the view if the method exists (textview,...)
                methodTypeFace.invoke(v.getChildAt(i), new Object[] {font, typeFace == null ? 0 : typeFace.getStyle()});
            }
            //Will catch the view with no such methods (listview...)
            catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

该方法将返回视图集的XML样式(粗体,斜体…),并在它们存在时应用它们。

对于ListView,我总是创建一个适配器,并在getView中设置字体。

是的,还有反思。这是可行的(基于这个答案):

(注意:这是一个变通办法,因为缺乏对自定义字体的支持,所以如果你想改变这种情况,请在这里对android问题进行星号投票)。注意:不要在这个问题上留下“我也是”的评论,当你这样做的时候,每个看过它的人都会收到一封电子邮件。所以请给它打上星号。

import java.lang.reflect.Field;
import android.content.Context;
import android.graphics.Typeface;

public final class FontsOverride {

    public static void setDefaultFont(Context context,
            String staticTypefaceFieldName, String fontAssetName) {
        final Typeface regular = Typeface.createFromAsset(context.getAssets(),
                fontAssetName);
        replaceFont(staticTypefaceFieldName, regular);
    }

    protected static void replaceFont(String staticTypefaceFieldName,
            final Typeface newTypeface) {
        try {
            final Field staticField = Typeface.class
                    .getDeclaredField(staticTypefaceFieldName);
            staticField.setAccessible(true);
            staticField.set(null, newTypeface);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}

然后你需要重载一些默认字体,例如在一个应用程序类:

public final class Application extends android.app.Application {
    @Override
    public void onCreate() {
        super.onCreate();
        FontsOverride.setDefaultFont(this, "DEFAULT", "MyFontAsset.ttf");
        FontsOverride.setDefaultFont(this, "MONOSPACE", "MyFontAsset2.ttf");
        FontsOverride.setDefaultFont(this, "SERIF", "MyFontAsset3.ttf");
        FontsOverride.setDefaultFont(this, "SANS_SERIF", "MyFontAsset4.ttf");
    }
}

当然,如果你使用相同的字体文件,你可以改进一下,只加载一次。

然而,我倾向于只覆盖一个,说“MONOSPACE”,然后设置一个样式来强制字体应用程序宽:

<resources>
    <style name="AppBaseTheme" parent="android:Theme.Light">
    </style>

    <!-- Application theme. -->
    <style name="AppTheme" parent="AppBaseTheme">
        <item name="android:typeface">monospace</item>
    </style>
</resources>

发射21 Android 5.0

我已经调查了评论中的报告,它不起作用,它似乎与主题机器人:theme . material . light不兼容。

如果这个主题对你来说不重要,那就用一个旧的主题,例如:

<style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">
    <item name="android:typeface">monospace</item>
</style>

您可以为每个布局逐个设置自定义字体,只需通过传递根视图从每个布局调用一个函数即可。首先,创建一个像这样访问字体对象的单例方法

 public class Font {
    private static Font font;
    public Typeface ROBO_LIGHT;

    private Font() {

    }

    public static Font getInstance(Context context) {
        if (font == null) {
            font = new Font();
            font.init(context);
        }
        return font;

    }

    public void init(Context context) {

        ROBO_LIGHT = Typeface.createFromAsset(context.getAssets(),
                "Roboto-Light.ttf");
    }

}

你可以在上面的类中定义不同的字体,现在定义一个字体助手类来应用字体:

   public class FontHelper {

    private static Font font;

    public static void applyFont(View parentView, Context context) {

        font = Font.getInstance(context);

        apply((ViewGroup)parentView);

    }

    private static void apply(ViewGroup parentView) {
        for (int i = 0; i < parentView.getChildCount(); i++) {

            View view = parentView.getChildAt(i);

//You can add any view element here on which you want to apply font 

            if (view instanceof EditText) {

                ((EditText) view).setTypeface(font.ROBO_LIGHT);

            }
            if (view instanceof TextView) {

                ((TextView) view).setTypeface(font.ROBO_LIGHT);

            }

            else if (view instanceof ViewGroup
                    && ((ViewGroup) view).getChildCount() > 0) {
                apply((ViewGroup) view);
            }

        }

    }

}

在上面的代码中,我只在textView和EditText上应用字体,你也可以在其他视图元素上应用字体。你只需要把根视图组的id传递给上面的apply font方法。例如,你的布局是:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:id="@+id/mainParent"
    tools:context="${relativePackage}.${activityClass}" >

    <RelativeLayout
        android:id="@+id/mainContainer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/homeFooter"
        android:layout_below="@+id/edit" >

        <ImageView
            android:id="@+id/PreviewImg"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/abc_list_longpressed_holo"
            android:visibility="gone" />

        <RelativeLayout
            android:id="@+id/visibilityLayer"
            android:layout_width="match_parent"
            android:layout_height="fill_parent" >

            <ImageView
                android:id="@+id/UseCamera"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentTop="true"
                android:layout_centerHorizontal="true"
                android:src="@drawable/camera" />

            <TextView
                android:id="@+id/tvOR"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/UseCamera"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="20dp"
                android:text="OR"
                android:textSize="30dp" />

            <TextView
                android:id="@+id/tvAND"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="20dp"
                android:text="OR"
                android:textSize="30dp" />

</RelativeLayout>

在上面的布局中,根父id是“Main parent”,现在让我们应用字体

public class MainActivity extends BaseFragmentActivity {

    private EditText etName;
    private EditText etPassword;
    private TextView tvTitle;
    public static boolean isHome = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

       Font font=Font.getInstance(getApplicationContext());
        FontHelper.applyFont(findViewById(R.id.mainParent),          getApplicationContext());
   }    
}

欢呼:)