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
import java.lang.ref.WeakReference;
import java.util.HashMap;
import android.content.Context;
import android.graphics.Typeface;
public class FontsManager {
private static FontsManager instance;
private static HashMap<String, WeakReference<Typeface>> typefaces = new HashMap<String, WeakReference<Typeface>>();
private static Context context;
private FontsManager(final Context ctx) {
if (context == null) {
context = ctx;
}
}
public static FontsManager getInstance(final Context appContext) {
if (instance == null) {
instance = new FontsManager(appContext);
}
return instance;
}
public static FontsManager getInstance() {
if (instance == null) {
throw new RuntimeException(
"Call getInstance(Context context) at least once to init the singleton properly");
}
return instance;
}
public Typeface getFont(final String assetName) {
final WeakReference<Typeface> tfReference = typefaces.get(assetName);
if (tfReference == null || tfReference.get() == null) {
final Typeface tf = Typeface.createFromAsset(context.getResources().getAssets(),
assetName);
typefaces.put(assetName, new WeakReference<Typeface>(tf));
return tf;
}
return tfReference.get();
}
}
通过这种方式，您可以创建一个继承自TextView的视图，并在其构造函数上调用setTypeface。
其他回答
import java.lang.ref.WeakReference;
import java.util.HashMap;
import android.content.Context;
import android.graphics.Typeface;
public class FontsManager {
private static FontsManager instance;
private static HashMap<String, WeakReference<Typeface>> typefaces = new HashMap<String, WeakReference<Typeface>>();
private static Context context;
private FontsManager(final Context ctx) {
if (context == null) {
context = ctx;
}
}
public static FontsManager getInstance(final Context appContext) {
if (instance == null) {
instance = new FontsManager(appContext);
}
return instance;
}
public static FontsManager getInstance() {
if (instance == null) {
throw new RuntimeException(
"Call getInstance(Context context) at least once to init the singleton properly");
}
return instance;
}
public Typeface getFont(final String assetName) {
final WeakReference<Typeface> tfReference = typefaces.get(assetName);
if (tfReference == null || tfReference.get() == null) {
final Typeface tf = Typeface.createFromAsset(context.getResources().getAssets(),
assetName);
typefaces.put(assetName, new WeakReference<Typeface>(tf));
return tf;
}
return tfReference.get();
}
}
通过这种方式，您可以创建一个继承自TextView的视图，并在其构造函数上调用setTypeface。
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);
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。
Android使用Roboto字体，这是一种非常漂亮的字体，有几种不同的粗细(普通、轻、薄、浓缩)，在高密度屏幕上看起来很棒。
检查下面的链接检查roboto字体:
如何使用Roboto在xml布局
回到你的问题，如果你想改变所有的TextView/按钮在你的应用程序的字体，尝试添加以下代码到你的styles.xml使用Roboto-light字体:
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
......
<item name="android:buttonStyle">@style/MyButton</item>
<item name="android:textViewStyle">@style/MyTextView</item>
</style>
<style name="MyButton" parent="@style/Widget.AppCompat.Button">
<item name="android:textAllCaps">false</item>
<item name="android:fontFamily">sans-serif-light</item>
</style>
<style name="MyTextView" parent="@style/TextAppearance.AppCompat">
<item name="android:fontFamily">sans-serif-light</item>
</style>
不要忘记在你的AndroidManifest.xml中使用“AppTheme”
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
......
</application>
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。
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