如何改变字体在TextView，默认它显示为Arial?怎么改成Helvetica字体?
当前回答
它有点老，但我改进了类CustomFontLoader一点点，我想分享它，所以它可以很有帮助。只需用这段代码创建一个新类。
import android.content.Context;
import android.graphics.Typeface;
public enum FontLoader {
ARIAL("arial"),
TIMES("times"),
VERDANA("verdana"),
TREBUCHET("trbuchet"),
GEORGIA("georgia"),
GENEVA("geneva"),
SANS("sans"),
COURIER("courier"),
TAHOMA("tahoma"),
LUCIDA("lucida");
private final String name;
private Typeface typeFace;
private FontLoader(final String name) {
this.name = name;
typeFace=null;
}
public static Typeface getTypeFace(Context context,String name){
try {
FontLoader item=FontLoader.valueOf(name.toUpperCase(Locale.getDefault()));
if(item.typeFace==null){
item.typeFace=Typeface.createFromAsset(context.getAssets(), "fonts/"+item.name+".ttf");
}
return item.typeFace;
} catch (Exception e) {
return null;
}
}
public static Typeface getTypeFace(Context context,int id){
FontLoader myArray[]= FontLoader.values();
if(!(id<myArray.length)){
return null;
}
try {
if(myArray[id].typeFace==null){
myArray[id].typeFace=Typeface.createFromAsset(context.getAssets(), "fonts/"+myArray[id].name+".ttf");
}
return myArray[id].typeFace;
}catch (Exception e) {
return null;
}
}
public static Typeface getTypeFaceByName(Context context,String name){
for(FontLoader item: FontLoader.values()){
if(name.equalsIgnoreCase(item.name)){
if(item.typeFace==null){
try{
item.typeFace=Typeface.createFromAsset(context.getAssets(), "fonts/"+item.name+".ttf");
}catch (Exception e) {
return null;
}
}
return item.typeFace;
}
}
return null;
}
public static void loadAllFonts(Context context){
for(FontLoader item: FontLoader.values()){
if(item.typeFace==null){
try{
item.typeFace=Typeface.createFromAsset(context.getAssets(), "fonts/"+item.name+".ttf");
}catch (Exception e) {
item.typeFace=null;
}
}
}
}
}
然后使用这段代码在你的textview:
Typeface typeFace=FontLoader.getTypeFace(context,"arial");
if(typeFace!=null) myTextView.setTypeface(typeFace);
其他回答
你可能想要创建一个包含所有字体的静态类。这样，您就不会多次创建字体，这可能会严重影响性能。 只要确保你在“assets”文件夹下创建了一个名为“fonts”的子文件夹。
你可以这样做:
public class CustomFontsLoader {
public static final int FONT_NAME_1 = 0;
public static final int FONT_NAME_2 = 1;
public static final int FONT_NAME_3 = 2;
private static final int NUM_OF_CUSTOM_FONTS = 3;
private static boolean fontsLoaded = false;
private static Typeface[] fonts = new Typeface[3];
private static String[] fontPath = {
"fonts/FONT_NAME_1.ttf",
"fonts/FONT_NAME_2.ttf",
"fonts/FONT_NAME_3.ttf"
};
/**
* Returns a loaded custom font based on it's identifier.
*
* @param context - the current context
* @param fontIdentifier = the identifier of the requested font
*
* @return Typeface object of the requested font.
*/
public static Typeface getTypeface(Context context, int fontIdentifier) {
if (!fontsLoaded) {
loadFonts(context);
}
return fonts[fontIdentifier];
}
private static void loadFonts(Context context) {
for (int i = 0; i < NUM_OF_CUSTOM_FONTS; i++) {
fonts[i] = Typeface.createFromAsset(context.getAssets(), fontPath[i]);
}
fontsLoaded = true;
}
}
通过这种方式，您可以从应用程序中的任何地方获取字体。
它有点老，但我改进了类CustomFontLoader一点点，我想分享它，所以它可以很有帮助。只需用这段代码创建一个新类。
import android.content.Context;
import android.graphics.Typeface;
public enum FontLoader {
ARIAL("arial"),
TIMES("times"),
VERDANA("verdana"),
TREBUCHET("trbuchet"),
GEORGIA("georgia"),
GENEVA("geneva"),
SANS("sans"),
COURIER("courier"),
TAHOMA("tahoma"),
LUCIDA("lucida");
private final String name;
private Typeface typeFace;
private FontLoader(final String name) {
this.name = name;
typeFace=null;
}
public static Typeface getTypeFace(Context context,String name){
try {
FontLoader item=FontLoader.valueOf(name.toUpperCase(Locale.getDefault()));
if(item.typeFace==null){
item.typeFace=Typeface.createFromAsset(context.getAssets(), "fonts/"+item.name+".ttf");
}
return item.typeFace;
} catch (Exception e) {
return null;
}
}
public static Typeface getTypeFace(Context context,int id){
FontLoader myArray[]= FontLoader.values();
if(!(id<myArray.length)){
return null;
}
try {
if(myArray[id].typeFace==null){
myArray[id].typeFace=Typeface.createFromAsset(context.getAssets(), "fonts/"+myArray[id].name+".ttf");
}
return myArray[id].typeFace;
}catch (Exception e) {
return null;
}
}
public static Typeface getTypeFaceByName(Context context,String name){
for(FontLoader item: FontLoader.values()){
if(name.equalsIgnoreCase(item.name)){
if(item.typeFace==null){
try{
item.typeFace=Typeface.createFromAsset(context.getAssets(), "fonts/"+item.name+".ttf");
}catch (Exception e) {
return null;
}
}
return item.typeFace;
}
}
return null;
}
public static void loadAllFonts(Context context){
for(FontLoader item: FontLoader.values()){
if(item.typeFace==null){
try{
item.typeFace=Typeface.createFromAsset(context.getAssets(), "fonts/"+item.name+".ttf");
}catch (Exception e) {
item.typeFace=null;
}
}
}
}
}
然后使用这段代码在你的textview:
Typeface typeFace=FontLoader.getTypeFace(context,"arial");
if(typeFace!=null) myTextView.setTypeface(typeFace);
另一种巩固字体创建的方法…
public class Font {
public static final Font PROXIMA_NOVA = new Font("ProximaNovaRegular.otf");
public static final Font FRANKLIN_GOTHIC = new Font("FranklinGothicURWBoo.ttf");
private final String assetName;
private volatile Typeface typeface;
private Font(String assetName) {
this.assetName = assetName;
}
public void apply(Context context, TextView textView) {
if (typeface == null) {
synchronized (this) {
if (typeface == null) {
typeface = Typeface.createFromAsset(context.getAssets(), assetName);
}
}
}
textView.setTypeface(typeface);
}
}
然后在你的活动中使用…
myTextView = (TextView) findViewById(R.id.myTextView);
Font.PROXIMA_NOVA.apply(this, myTextView);
请注意，这种带有volatile字段的双重检查锁定习惯用法仅适用于Java 1.5+中使用的内存模型。
最好的实践
TextViewPlus.java:
public class TextViewPlus extends TextView {
private static final String TAG = "TextView";
public TextViewPlus(Context context) {
super(context);
}
public TextViewPlus(Context context, AttributeSet attrs) {
super(context, attrs);
setCustomFont(context, attrs);
}
public TextViewPlus(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setCustomFont(context, attrs);
}
private void setCustomFont(Context ctx, AttributeSet attrs) {
TypedArray a = ctx.obtainStyledAttributes(attrs, R.styleable.TextViewPlus);
String customFont = a.getString(R.styleable.TextViewPlus_customFont);
setCustomFont(ctx, customFont);
a.recycle();
}
public boolean setCustomFont(Context ctx, String asset) {
Typeface typeface = null;
try {
typeface = Typeface.createFromAsset(ctx.getAssets(), asset);
} catch (Exception e) {
Log.e(TAG, "Unable to load typeface: "+e.getMessage());
return false;
}
setTypeface(typeface);
return true;
}
}
attrs.xml:(在哪里放置res/values)
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="TextViewPlus">
<attr name="customFont" format="string"/>
</declare-styleable>
</resources>
使用方法:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:foo="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.mypackage.TextViewPlus
android:id="@+id/textViewPlus1"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:text="@string/showingOffTheNewTypeface"
foo:customFont="my_font_name_regular.otf">
</com.mypackage.TextViewPlus>
</LinearLayout>
希望这对你有所帮助。
我终于找到了一个非常简单的解决方法。
use these Support libraries in app level gradle, compile 'com.android.support:appcompat-v7:26.0.2' compile 'com.android.support:support-v4:26.0.2' then create a directory named "font" inside the res folder put fonts(ttf) files in that font directory, keep in mind the naming conventions [e.g.name should not contain any special character, any uppercase character and any space or tab] After that, reference that font from xml like this <Button android:id="@+id/btn_choose_employee" android:layout_width="140dp" android:layout_height="40dp" android:layout_centerInParent="true" android:background="@drawable/rounded_red_btn" android:onClick="btnEmployeeClickedAction" android:text="@string/searching_jobs" android:textAllCaps="false" android:textColor="@color/white" android:fontFamily="@font/times_new_roman_test" />
在本例中，times_new_roman_test是该字体目录中的字体ttf文件
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