Android为整个应用切换第三方字体

一、

1、通过反射来获取系统字体并替换

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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();          }      } }

2、在Application类中执行修改字体（替换系统默认字体）

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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" );      } }

二、

配置文件AndroidManifest.xml中修改（只限系统theme中已有字体）

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<style name= "AppTheme" parent= "android:Theme.Holo.Light.DarkActionBar" >      <item name= "android:typeface" >monospace</item> </style>

三、遍历viewGroup下所有文本控件并设置字体

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/**   * 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... */ }          }      } }

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final Typeface mFont = Typeface.createFromAsset(getAssets(), "fonts/MyFont.ttf" ); final ViewGroup mContainer = (ViewGroup) findViewById( android.R.id.content).getRootView(); HomeActivity.setAppFont(mContainer, mFont);

四、自定义控件并设置字体

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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);      } }

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1	<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" ></com.packagename.cusfnttextview>