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
也许可以简单一点:
public class Fonts {
public static HashSet<String,Typeface> fonts = new HashSet<>();
public static Typeface get(Context context, String file) {
if (! fonts.contains(file)) {
synchronized (this) {
Typeface typeface = Typeface.createFromAsset(context.getAssets(), name);
fonts.put(name, typeface);
}
}
return fonts.get(file);
}
}
// Usage
Typeface myFont = Fonts.get("arial.ttf");
(请注意,此代码未经测试,但通常这种方法应该工作良好。)
其他回答
Typeface tf = Typeface.createFromAsset(getAssets(),
"fonts/DroidSansFallback.ttf");
TextView tv = (TextView) findViewById(R.id.CustomFontText);
tv.setTypeface(tf);
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。
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。
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。
也许可以简单一点:
public class Fonts {
public static HashSet<String,Typeface> fonts = new HashSet<>();
public static Typeface get(Context context, String file) {
if (! fonts.contains(file)) {
synchronized (this) {
Typeface typeface = Typeface.createFromAsset(context.getAssets(), name);
fonts.put(name, typeface);
}
}
return fonts.get(file);
}
}
// Usage
Typeface myFont = Fonts.get("arial.ttf");
(请注意,此代码未经测试,但通常这种方法应该工作良好。)
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