问题
I need to use certain font for my entire application. I have .ttf file for the same. Is it possible to set this as default font, at application start up and then use it elsewhere in the application? When set, how do I use it in my layout XMLs?
回答1:
Yes with reflection. This works (based on this answer):
(Note: this is a workaround due to lack of support for custom fonts, so if you want to change this situation please do star to up-vote the android issue here). Note: Do not leave "me too" comments on that issue, everyone who has stared it gets an email when you do that. So just "star" it please.
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();
}
}
}
You then need to overload the few default fonts, for example in an application class:
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");
}
}
Or course if you are using the same font file, you can improve on this to load it just once.
However I tend to just override one, say "MONOSPACE", then set up a style to force that font typeface application wide:
<resources>
<style name="AppBaseTheme" parent="android:Theme.Light">
</style>
<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
<item name="android:typeface">monospace</item>
</style>
</resources>
API 21 Android 5.0
I've investigated the reports in the comments that it doesn't work and it appears to be incompatible with the theme android:Theme.Material.Light.
If that theme is not important to you, use an older theme, e.g.:
<style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">
<item name="android:typeface">monospace</item>
</style>
回答2:
There is a great library for custom fonts in android:Calligraphy
here is a sample how to use it.
in Gradle you need to put this line into your app's build.gradle file:
dependencies {
compile 'uk.co.chrisjenx:calligraphy:2.2.0'
}
and then make a class that extends Application and write this code:
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
.setDefaultFontPath("your font path")
.setFontAttrId(R.attr.fontPath)
.build()
);
}
}
and in the activity class put this method before onCreate:
@Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}
and the last thing your manifest file should look like this:
<application
.
.
.
android:name=".App">
and it will change the whole activity to your font! it's simple and clean!
回答3:
While this would not work for an entire application, it would work for an Activity and could be re-used for any other Activity. I've updated my code thanks to @FR073N to support other Views. I'm not sure about issues with Buttons, RadioGroups, etc. because those classes all extend TextView so they should work just fine. I added a boolean conditional for using reflection because it seems very hackish and might notably compromise performance.
Note: as pointed out, this will not work for dynamic content! For that, it's possible to call this method with say an onCreateView or getView method, but requires additional effort.
/**
* Recursively sets a {@link Typeface} to all
* {@link TextView}s in a {@link ViewGroup}.
*/
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... */ }
}
}
}
Then to use it you would do something like this:
final Typeface mFont = Typeface.createFromAsset(getAssets(),
"fonts/MyFont.ttf");
final ViewGroup mContainer = (ViewGroup) findViewById(
android.R.id.content).getRootView();
HomeActivity.setAppFont(mContainer, mFont);
Hope that helps.
回答4:
In summary:
Option#1: Use reflection to apply font (combining weston & Roger Huang's answer):
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();
}
}
}
}
Usage in Application class:
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");
}
}
set up a style to force that font typeface application wide (based on 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>
Lollipop (API 21):
<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>
Option2: Subclass each and every View where you need to customize font, ie. ListView, EditTextView, Button, etc. (Palani's answer):
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);
}
}
Option 3: Implement a View Crawler that traverses through the view hierarchy of your current screen:
Variation#1 (Tom's answer):
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... */ }
}
}
}
Usage :
final ViewGroup mContainer = (ViewGroup) findViewById(
android.R.id.content).getRootView();
HomeActivity.setAppFont(mContainer, Typeface.createFromAsset(getAssets(),
"fonts/MyFont.ttf"));
Variation#2: https://coderwall.com/p/qxxmaa/android-use-a-custom-font-everywhere.
Option #4: Use 3rd Party Lib called Calligraphy.
Personally, I would recommend Option#4, as it saves a lot of headaches.
回答5:
I would like to improve weston's answer for API 21 Android 5.0.
Cause
Under API 21, most of the text styles include fontFamily setting, like:
<style name="TextAppearance.Material">
<item name="fontFamily">@string/font_family_body_1_material</item>
</style>
Which applys the default Roboto Regular font:
<string name="font_family_body_1_material">sans-serif</string>
The original answer fails to apply monospace font, because android:fontFamily has greater priority to android:typeface attribute (reference). Using Theme.Holo.* is a valid workaround, because there is no android:fontFamily settings inside.
Solution
Since Android 5.0 put system typeface in static variable Typeface.sSystemFontMap (reference), we can use the same reflection technique to replace it:
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();
}
}
}
回答6:
its very simple... 1.Download and put ur custom font in assets..then write one separate class for text view as follows: here i used futura font
public class CusFntTextView extends TextView {
public CusFntTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public CusFntTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public CusFntTextView(Context context) {
super(context);
init();
}
private void init() {
if (!isInEditMode()) {
Typeface tf = Typeface.createFromAsset(getContext().getAssets(), "Futura.ttf");
setTypeface(tf);
}
}
}
and do the following in xml :
<com.packagename.CusFntTextView
android:id="@+id/tvtitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hi Android"
android:textAppearance="?android:attr/textAppearanceLarge"
/>
回答7:
I would also suggest extending TextView and other controls, but it would be better I consider to set up font in constructs.
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));
}
回答8:
I would like to improve weston's and Roger Huang's answers for over API 21 Android lollipop with theme "Theme.AppCompat".
Below Android 4.4
<resources>
<style name="AppBaseTheme" parent="Theme.AppCompat.Light">
</style>
<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
<item name="android:typeface">monospace</item>
</style>
</resources>
Over(equal) API 5.0
<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>
And the FontsOverride util file is same as what in weston's answer. I have tested in these phones:
Nexus 5(android 5.1 Primary Android System)
ZTE V5(android 5.1 CM12.1)
XIAOMI note(android 4.4 MIUI6)
HUAWEI C8850(android 2.3.5 UNKNOWN)
回答9:
A brilliant solution can be found here: https://coderwall.com/p/qxxmaa/android-use-a-custom-font-everywhere.
Simply extend activities from BaseActivity and write those methods. Also you should better cache fonts as described here: https://stackoverflow.com/a/16902532/2914140.
After some research I wrote code that works at Samsung Galaxy Tab A (Android 5.0). Used code of weston and Roger Huang as well as https://stackoverflow.com/a/33236102/2914140. Also tested on Lenovo TAB 2 A10-70L, where it doesn't work. I inserted a font 'Comic Sans' here in order to see a difference.
import android.content.Context;
import android.graphics.Typeface;
import android.os.Build;
import android.util.Log;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
public class FontsOverride {
private static final int BOLD = 1;
private static final int BOLD_ITALIC = 2;
private static final int ITALIC = 3;
private static final int LIGHT = 4;
private static final int CONDENSED = 5;
private static final int THIN = 6;
private static final int MEDIUM = 7;
private static final int REGULAR = 8;
private Context context;
public FontsOverride(Context context) {
this.context = context;
}
public void loadFonts() {
Map<String, Typeface> fontsMap = new HashMap<>();
fontsMap.put("sans-serif", getTypeface("comic.ttf", REGULAR));
fontsMap.put("sans-serif-bold", getTypeface("comic.ttf", BOLD));
fontsMap.put("sans-serif-italic", getTypeface("comic.ttf", ITALIC));
fontsMap.put("sans-serif-light", getTypeface("comic.ttf", LIGHT));
fontsMap.put("sans-serif-condensed", getTypeface("comic.ttf", CONDENSED));
fontsMap.put("sans-serif-thin", getTypeface("comic.ttf", THIN));
fontsMap.put("sans-serif-medium", getTypeface("comic.ttf", MEDIUM));
overrideFonts(fontsMap);
}
private void overrideFonts(Map<String, Typeface> typefaces) {
if (Build.VERSION.SDK_INT == 21) {
try {
final Field field = Typeface.class.getDeclaredField("sSystemFontMap");
field.setAccessible(true);
Map<String, Typeface> oldFonts = (Map<String, Typeface>) field.get(null);
if (oldFonts != null) {
oldFonts.putAll(typefaces);
} else {
oldFonts = typefaces;
}
field.set(null, oldFonts);
field.setAccessible(false);
} catch (Exception e) {
Log.e("TypefaceUtil", "Cannot set custom fonts");
}
} else {
try {
for (Map.Entry<String, Typeface> entry : typefaces.entrySet()) {
final Field staticField = Typeface.class.getDeclaredField(entry.getKey());
staticField.setAccessible(true);
staticField.set(null, entry.getValue());
}
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}
private Typeface getTypeface(String fontFileName, int fontType) {
final Typeface tf = Typeface.createFromAsset(context.getAssets(), "fonts/" + fontFileName);
return Typeface.create(tf, fontType);
}
}
To run the code in entire application you should write in some class like Application the following:
new FontsOverride(this).loadFonts();
Create a folder 'fonts' inside 'assets' and put needed fonts there. A simple instruction may be found here: https://stackoverflow.com/a/31697103/2914140.
The Lenovo device also incorrectly gets a value of a typeface. In most times it returns Typeface.NORMAL, sometimes null. Even if a TextView is bold (in xml-file layout). See here: TextView isBold always returns NORMAL. This way a text on a screen is always in a regural font, not bold or italic. So I think it's a bug of a producer.
回答10:
Working for Xamarin.Android:
Class:
public class FontsOverride
{
public static void SetDefaultFont(Context context, string staticTypefaceFieldName, string fontAssetName)
{
Typeface regular = Typeface.CreateFromAsset(context.Assets, fontAssetName);
ReplaceFont(staticTypefaceFieldName, regular);
}
protected static void ReplaceFont(string staticTypefaceFieldName, Typeface newTypeface)
{
try
{
Field staticField = ((Java.Lang.Object)(newTypeface)).Class.GetDeclaredField(staticTypefaceFieldName);
staticField.Accessible = true;
staticField.Set(null, newTypeface);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
Application Implementation:
namespace SomeAndroidApplication
{
[Application]
public class App : Application
{
public App()
{
}
public App(IntPtr handle, JniHandleOwnership transfer)
: base(handle, transfer)
{
}
public override void OnCreate()
{
base.OnCreate();
FontsOverride.SetDefaultFont(this, "MONOSPACE", "fonts/Roboto-Light.ttf");
}
}
}
Style:
<style name="Theme.Storehouse" parent="Theme.Sherlock">
<item name="android:typeface">monospace</item>
</style>
回答11:
As of Android O this is now possible to define directly from the XML and my bug is now closed!
See here for details
TL;DR:
First you must add your fonts to the project
Second you add a font family, like so:
<?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>
Finally, you can use the font in a layout or style:
<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>
Enjoy!
回答12:
You can set custom fonts for every layout one by one ,with just one function call from every layout by passing its root View.First ,create a singelton approach for accessing font object like this
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");
}
}
You can define different fonts in above class, Now Define a font Helper class that will apply fonts :
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);
}
}
}
}
In the above code, I am applying fonts on textView and EditText only , you can apply fonts on other view elements as well similarly.You just need to pass the id of your root View group to the above apply font method. for example your layout is :
<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>
In the Above Layout the root parent id is "Main Parent " now lets apply font
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());
}
}
Cheers :)
回答13:
I would suggest extending TextView, and always using your custom TextView within your XML layouts or wherever you need a TextView. In your custom TextView, override setTypeface
@Override
public void setTypeface(Typeface tf, int style) {
//to handle bold, you could also handle italic or other styles here as well
if (style == 1){
tf = Typeface.createFromAsset(getContext().getApplicationContext().getAssets(), "MuseoSans700.otf");
}else{
tf = Typeface.createFromAsset(getContext().getApplicationContext().getAssets(), "MuseoSans500.otf");
}
super.setTypeface(tf, 0);
}
回答14:
Tom's solution works great, but only works with TextView and EditText.
If you want to cover most of the views (RadioGroup, TextView, Checkbox...), I created a method doing that :
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();
}
}
}
}
This method will get back the style of the view set in XML (bold, italic...) and apply them if they exists.
For the ListView, I always create an adapter, and I set the font inside getView.
回答15:
I wrote a class assigning typeface to the views in the current view hierarchy and based os the current typeface properties (bold, normal, you can add other styles if you want):
public final class TypefaceAssigner {
public final Typeface DEFAULT;
public final Typeface DEFAULT_BOLD;
@Inject
public TypefaceAssigner(AssetManager assetManager) {
DEFAULT = Typeface.createFromAsset(assetManager, "TradeGothicLTCom.ttf");
DEFAULT_BOLD = Typeface.createFromAsset(assetManager, "TradeGothicLTCom-Bd2.ttf");
}
public void assignTypeface(View v) {
if (v instanceof ViewGroup) {
for (int i = 0; i < ((ViewGroup) v).getChildCount(); i++) {
View view = ((ViewGroup) v).getChildAt(i);
if (view instanceof ViewGroup) {
setTypeface(view);
} else {
setTypeface(view);
}
}
} else {
setTypeface(v);
}
}
private void setTypeface(View view) {
if (view instanceof TextView) {
TextView textView = (TextView) view;
Typeface typeface = textView.getTypeface();
if (typeface != null && typeface.isBold()) {
textView.setTypeface(DEFAULT_BOLD);
} else {
textView.setTypeface(DEFAULT);
}
}
}
}
Now in all fragments in onViewCreated or onCreateView, in all activities in onCreate and in all view adapters in getView or newView just invoke:
typefaceAssigner.assignTypeface(view);
回答16:
Finally, Google realized the severity of this problem (applying custom font to UI components) and they devised a clean solution for it.
First, you need to update to support library 26+ (you may also need to update your gradle{4.0+}, android studio), then you can create a new resource folder called font. In this folder, you can put your font resources (.tff,...). Then you need to override the default app them and force your custom font into it :)
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="android:fontFamily">@font/my_custom_font</item>
</style>
Note: if you want to support devices with older API than 16, you have to use app namespace instead of android!
回答17:
in api 26 with build.gradle 3.0.0 and higher you can create a font directory in res and use this line in your style
<item name="android:fontFamily">@font/your_font</item>
for change build.gradle use this in your build.gradle dependecies
classpath 'com.android.tools.build:gradle:3.0.0'
回答18:
I would also like to improve weston's answer for API 21 Android 5.0.
I had the same issue on my Samsung s5, when using DEFAULT font. (with the others fonts it's working fine)
I managed to make it working by setting the typeface ("sans" for example) in XML files, for each Textview or Button
<TextView
android:layout_width="match_parent"
android:layout_height="39dp"
android:textColor="@color/abs__background_holo_light"
android:textSize="12sp"
android:gravity="bottom|center"
android:typeface="sans" />
and in MyApplication Class :
public class MyApplication extends Application {
@Override
public void onCreate() {
TypefaceUtil.overrideFont(getApplicationContext(), "SANS_SERIF",
"fonts/my_font.ttf");
}
}
Hope it helps.
回答19:
This solution does not work correctly in some situations.
So I extend it:
FontsReplacer.java
public class MyApplication extends Application {
@Override
public void onCreate() {
FontsReplacer.replaceFonts(this);
super.onCreate();
}
}
https://gist.github.com/orwir/6df839e3527647adc2d56bfadfaad805
回答20:
Calligraphy works pretty well, but it is not suitable for me, since it does not support different weights (bold, italic, etc) for a font-family.
So I tried Fontain, which allows you to define custom Views and apply them custom font families.
in order to use Fontain, you should add the following to your app module build.gradle:
compile 'com.scopely:fontain:1.0.0'
Then, instead of using regular TextView, you should use FontTextView
Example of FontTextView with uppercase and bold content:
<com.scopely.fontain.views.FontTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/black"
android:textColor="@android:color/white"
android:textSize="11dp"
android:gravity="center"
android:id="@+id/tv1"
app:font_family="myCustomFont"
app:caps_mode="characters"
app:font_weight="BOLD"/>
回答21:
package com.theeasylearn.demo.designdemo;
import android.content.Context;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.TextView;
public class MyButton extends TextView {
public MyButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public MyButton(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public MyButton(Context context) {
super(context);
init();
}
private void init() {
Typeface tf =
Typeface.createFromAsset(
getContext().getAssets(), "angelina.TTF");
setTypeface(tf);
}
}
回答22:
For changing default font family of the TextViews, override textViewStyle in your app theme.
For using custom font in fontFamily, use font resources which is in support library.
The feature was added in Android 26 but backported to older versions via supportlib.
https://developer.android.com/guide/topics/resources/font-resource.html https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml.html#using-support-lib
回答23:
Since the release of Android Oreo and its support library (26.0.0) you can do this easily. Refer to this answer in another question.
Basically your final style will look like this:
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="fontFamily">@font/your_font</item> <!-- target android sdk versions < 26 and > 14 -->
</style>
回答24:
I found the mixture of calligraphy 3 library and coderwall's post as my ultimate result.
回答25:
Yes, its possible to set the font to the entire application.
The easiest way to accomplish this is to package the desired font(s) with your application.
To do this, simply create an assets/ folder in the project root, and put your fonts (in TrueType, or TTF, form) in the assets.
You might, for example, create assets/fonts/ and put your TTF files in there.
public class FontSampler extends Activity {
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
TextView tv=(TextView)findViewById(R.id.custom);
Typeface face=Typeface.createFromAsset(getAssets(), "fonts/HandmadeTypewriter.ttf");
tv.setTypeface(face);
}
}
来源：https://stackoverflow.com/questions/2711858/is-it-possible-to-set-a-custom-font-for-entire-of-application