Refactored code to make it easier to define a font family for the application along with its own specific ‘textStyle’ values.

For example, you can have the Roboto font family with ‘normal’, ‘bold’, ‘condensed’, ‘condensedBold’ etc. and also the SourceSansPro family with ‘lightItalic’ and ‘black’.
Normally in one application theme you have a single font family, but this also supports multiple font families at once.

Author: evelyne24

.gitignore

@@ -18,6 +18,7 @@ local.properties
 # Eclipse project files
 .classpath
 .project
+.gradle/
 
 # Proguard folder generated by Eclipse
 proguard/

Library/src/main/AndroidManifest.xml

@@ -10,7 +10,7 @@
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
-        android:theme="@style/AppTheme"
+        android:theme="@style/AppTheme.Light"
         android:name=".MyApp">
         <activity
             android:name=".MainActivity"

Library/src/main/assets/sourcesanspro/SourceSansPro-Black.ttf

@@ -7,58 +7,102 @@
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 
 public class MainActivity extends ActionBarActivity {
 
+    public static final String THEME_ID = "theme_id";
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+
+        // The AppTheme.Light theme shows Roboto and SourceSansPro fonts.
+        // The AppTheme.Dark  theme shows SourceSansPro font.
+        final int themeId;
+        if (getIntent().hasExtra(THEME_ID)) {
+            themeId = getIntent().getIntExtra(THEME_ID, R.style.AppTheme_Light);
+            setTheme(themeId);
+        } else {
+            themeId = MyApp.getThemeId(this);
+        }
+
         setContentView(R.layout.activity_main);
 
+        // Demo fragments for showing the fonts in action.
         if (savedInstanceState == null) {
-            getSupportFragmentManager().beginTransaction()
-                    .add(R.id.container, new PlaceholderFragment())
-                    .commit();
+            final Fragment fragment = (R.style.AppTheme_Light == themeId) ? RobotoFragment.newInstance()
+                    : SourceSansProFragment.newInstance();
+            getSupportFragmentManager().beginTransaction().add(R.id.container, fragment).commit();
         }
     }
 
 
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
-
-        // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }
 
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
-        // Handle action bar item clicks here. The action bar will
-        // automatically handle clicks on the Home/Up button, so long
-        // as you specify a parent activity in AndroidManifest.xml.
-        int id = item.getItemId();
-        if (id == R.id.action_settings) {
-            return true;
+        return item.getItemId() == R.id.action_settings || super.onOptionsItemSelected(item);
+    }
+
+    public void switchTheme() {
+        final int themeId;
+        if (getIntent().hasExtra(THEME_ID)) {
+            themeId = getIntent().getIntExtra(THEME_ID, R.style.AppTheme_Light);
+        } else {
+            themeId = MyApp.getThemeId(this);
         }
-        return super.onOptionsItemSelected(item);
+        final int newThemeId = (R.style.AppTheme_Light == themeId) ? R.style.AppTheme_Dark : R.style.AppTheme_Light;
+        finish();
+        startActivity(getIntent().putExtra(THEME_ID, newThemeId));
     }
 
-    /**
-     * A placeholder fragment containing a simple view.
-     */
-    public static class PlaceholderFragment extends Fragment {
 
-        public PlaceholderFragment() {
+    public static class RobotoFragment extends Fragment {
+
+        public static RobotoFragment newInstance() {
+            return new RobotoFragment();
         }
 
         @Override
-        public View onCreateView(LayoutInflater inflater, ViewGroup container,
-                                 Bundle savedInstanceState) {
-            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
+        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+            final View rootView = inflater.inflate(R.layout.fragment_main_roboto, container, false);
+
             // Apply a custom TextStyle from code.
-            TypefaceTextView textView = (TypefaceTextView) rootView.findViewById(R.id.textView);
+            final TypefaceTextView textView = (TypefaceTextView) rootView.findViewById(R.id.textView);
             textView.setTextStyle(RobotoTextStyle.BOLD);
+
+            rootView.findViewById(R.id.switch_theme).setOnClickListener(new OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    ((MainActivity) getActivity()).switchTheme();
+                }
+            });
+            return rootView;
+        }
+    }
+
+    public static class SourceSansProFragment extends Fragment {
+
+        public static SourceSansProFragment newInstance() {
+            return new SourceSansProFragment();
+        }
+
+        @Override
+        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+            final View rootView = inflater.inflate(R.layout.fragment_main_source, container, false);
+
+            rootView.findViewById(R.id.switch_theme).setOnClickListener(new OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    ((MainActivity) getActivity()).switchTheme();
+                }
+            });
             return rootView;
         }
     }

Library/src/main/assets/sourcesanspro/SourceSansPro-LightItalic.ttf

@@ -1,6 +1,9 @@
 package org.codeandmagic.android;
 
 import android.app.Application;
+import android.content.Context;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
 
 /**
  * Created by evelina on 16/01/2014.
@@ -10,6 +13,17 @@ public class MyApp extends Application {
     @Override
     public void onCreate() {
         super.onCreate();
-        TypefaceManager.setTextStyleExtractor(RobotoTextStyleExtractor.getInstance());
+        TypefaceManager.addTextStyleExtractor(RobotoTextStyleExtractor.getInstance());
+        TypefaceManager.addTextStyleExtractor(SourceSansProTextStyleExtractor.getInstance());
+    }
+
+    public static int getThemeId(Context context) {
+        try {
+            String packageName = MyApp.class.getPackage().getName();
+            PackageInfo packageInfo = context.getPackageManager().getPackageInfo(packageName, PackageManager.GET_META_DATA);
+            return packageInfo.applicationInfo.theme;
+        } catch (Exception e) {
+            return 0;
+        }
     }
 }

Library/src/main/assets/sourcesanspro/SourceSansPro-Regular.ttf

@@ -1,25 +1,34 @@
 package org.codeandmagic.android;
 
 /**
+ * Implementation of {@link TextStyle} defining the possible values for the 'textStyle' attribute
+ * using the Roboto font.
  * Created by evelina on 16/01/2014.
  */
 public enum RobotoTextStyle implements TextStyle {
 
-    NORMAL("roboto/Roboto-Regular.ttf"),
-    LIGHT("roboto/Roboto-Light.ttf"),
-    BOLD("roboto/Roboto-Bold.ttf"),
-    CONDENSED("roboto/RobotoCondensed-Regular.ttf"),
-    CONDENSED_LIGHT("roboto/RobotoCondensed-Light.ttf"),
-    CONDENSED_BOLD("roboto/RobotoCondensed-Bold.ttf");
+    NORMAL("normal", "roboto/Roboto-Regular.ttf"),
+    LIGHT("light", "roboto/Roboto-Light.ttf"),
+    BOLD("bold", "roboto/Roboto-Bold.ttf"),
+    CONDENSED("condensed", "roboto/RobotoCondensed-Regular.ttf"),
+    CONDENSED_LIGHT("condensedLight", "roboto/RobotoCondensed-Light.ttf"),
+    CONDENSED_BOLD("condensedBold", "roboto/RobotoCondensed-Bold.ttf");
 
+    private String mName;
     private String mFontName;
 
-    RobotoTextStyle(String fontName) {
+    RobotoTextStyle(String name, String fontName) {
+        mName = name;
         mFontName = fontName;
     }
 
     @Override
     public String getFontName() {
         return mFontName;
     }
+
+    @Override
+    public String getName() {
+        return mName;
+    }
 }

Library/src/main/assets/sourcesanspro/SourceSansPro-SemiBoldItalic.ttf

@@ -1,12 +1,9 @@
 package org.codeandmagic.android;
 
-import android.app.Application;
-
 /**
- * Implementation of {@TextStyleExtractor} which defines what fonts are used by the
- * {@link Application}.
+ * Implementation of {@TextStyleExtractor} for the Roboto font.
  */
-public class RobotoTextStyleExtractor implements TextStyleExtractor {
+public class RobotoTextStyleExtractor extends TextStyleExtractor {
 
     private static final RobotoTextStyleExtractor INSTANCE = new RobotoTextStyleExtractor();
 
@@ -18,9 +15,4 @@ public static TextStyleExtractor getInstance() {
     public TextStyle[] getTextStyles() {
         return RobotoTextStyle.values();
     }
-
-    @Override
-    public TextStyle getFromTextStyleOrdinal(int textStyleOrdinal) {
-        return getTextStyles()[textStyleOrdinal];
-    }
 }