Add TestApi that change default typeface

Bug: 238597089
Test: atest android.theme.cts.ThemeHostTest#testThemes
Change-Id: Ia56b4424ab27b2f8dd01c0e61a1f9d26bd661fc9

2 files changed, 37 insertions, 0 deletions

diff --git a/core/api/test-current.txt b/core/api/test-current.txt
index b13ebf388d1f..221cbdcfd4d7 100644
--- a/core/api/test-current.txt
+++ b/core/api/test-current.txt
@@ -1026,6 +1026,7 @@ package android.graphics {
   }
 
   public class Typeface {
+    method @NonNull public static android.util.Pair<java.util.List<android.graphics.Typeface>,java.util.List<android.graphics.Typeface>> changeDefaultFontForTest(@NonNull java.util.List<android.graphics.Typeface>, @NonNull java.util.List<android.graphics.Typeface>);
     method @NonNull public static long[] deserializeFontMap(@NonNull java.nio.ByteBuffer, @NonNull java.util.Map<java.lang.String,android.graphics.Typeface>) throws java.io.IOException;
     method @Nullable public static android.os.SharedMemory getSystemFontMapSharedMemory();
     method @NonNull public static android.os.SharedMemory serializeFontMap(@NonNull java.util.Map<java.lang.String,android.graphics.Typeface>) throws android.system.ErrnoException, java.io.IOException;
diff --git a/graphics/java/android/graphics/Typeface.java b/graphics/java/android/graphics/Typeface.java
index a2f5301e353f..d6692a968e45 100644
--- a/graphics/java/android/graphics/Typeface.java
+++ b/graphics/java/android/graphics/Typeface.java
@@ -50,6 +50,7 @@ import android.util.Base64;
 import android.util.Log;
 import android.util.LongSparseArray;
 import android.util.LruCache;
+import android.util.Pair;
 import android.util.SparseArray;
 
 import com.android.internal.annotations.GuardedBy;
@@ -1384,6 +1385,41 @@ public class Typeface {
         }
     }
 
+    /**
+     * Change default typefaces for testing purpose.
+     *
+     * Note: The existing TextView or Paint instance still holds the old Typeface.
+     *
+     * @param defaults array of [default, default_bold, default_italic, default_bolditalic].
+     * @param genericFamilies array of [sans-serif, serif, monospace]
+     * @return return the old defaults and genericFamilies
+     * @hide
+     */
+    @TestApi
+    @NonNull
+    public static Pair<List<Typeface>, List<Typeface>> changeDefaultFontForTest(
+            @NonNull List<Typeface> defaults,
+            @NonNull List<Typeface> genericFamilies
+    ) {
+        synchronized (SYSTEM_FONT_MAP_LOCK) {
+            List<Typeface> oldDefaults = Arrays.asList(sDefaults);
+            sDefaults = defaults.toArray(new Typeface[4]);
+            setDefault(defaults.get(0));
+
+            ArrayList<Typeface> oldGenerics = new ArrayList<>();
+            oldGenerics.add(sSystemFontMap.get("sans-serif"));
+            sSystemFontMap.put("sans-serif", genericFamilies.get(0));
+
+            oldGenerics.add(sSystemFontMap.get("serif"));
+            sSystemFontMap.put("serif", genericFamilies.get(1));
+
+            oldGenerics.add(sSystemFontMap.get("monospace"));
+            sSystemFontMap.put("monospace", genericFamilies.get(2));
+
+            return new Pair<>(oldDefaults, oldGenerics);
+        }
+    }
+
     static {
         // Preload Roboto-Regular.ttf in Zygote for improving app launch performance.
         preloadFontFile("/system/fonts/Roboto-Regular.ttf");