如果您計劃在同一個字體添加到幾個按鈕,我建議你去所有的方式,實現它的風格和子鍵:
public class ButtonPlus extends Button {
public ButtonPlus(Context context) {
super(context);
}
public ButtonPlus(Context context, AttributeSet attrs) {
super(context, attrs);
CustomFontHelper.setCustomFont(this, context, attrs);
}
public ButtonPlus(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
CustomFontHelper.setCustomFont(this, context, attrs);
}
}
這是一個輔助類設置字體基於該com.my.package一個TextView(記住,按鈕TextView中的一個子類):字體屬性:
public class CustomFontHelper {
/**
* Sets a font on a textview based on the custom com.my.package:font attribute
* If the custom font attribute isn't found in the attributes nothing happens
* @param textview
* @param context
* @param attrs
*/
public static void setCustomFont(TextView textview, Context context, AttributeSet attrs) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomFont);
String font = a.getString(R.styleable.CustomFont_font);
setCustomFont(textview, font, context);
a.recycle();
}
/**
* Sets a font on a textview
* @param textview
* @param font
* @param context
*/
public static void setCustomFont(TextView textview, String font, Context context) {
if(font == null) {
return;
}
Typeface tf = FontCache.get(font, context);
if(tf != null) {
textview.setTypeface(tf);
}
}
}
而這裏的FontCache減少對舊設備的內存使用情況:
public class FontCache {
private static Hashtable<String, Typeface> fontCache = new Hashtable<String, Typeface>();
public static Typeface get(String name, Context context) {
Typeface tf = fontCache.get(name);
if(tf == null) {
try {
tf = Typeface.createFromAsset(context.getAssets(), name);
}
catch (Exception e) {
return null;
}
fontCache.put(name, tf);
}
return tf;
}
}
在RES /價值/ attrs.xml我們定義自定義設置樣式屬性
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="CustomFont">
<attr name="font" format="string"/>
</declare-styleable>
</resources>
最後在佈局的例子使用:
<com.my.package.buttons.ButtonPlus
style="@style/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_sometext"/>
而在RES /價值/風格.xml
<style name="button" parent="@android:style/Widget.Button">
<item name="com.my.package:font">fonts/copperplate_gothic_light.TTF</item>
</style>
這可能看起來像很多工作,但你會感謝我一次y你有幾個按鈕和文本框,你想改變字體。