Introduce FontStyle.FONT_WEIGHT_UNSPECIFIED constant

Introduce a new constant FontStyle.FONT_WEIGHT_UNSPECIFIED = -1, which is used when text weight is not specified. Also replace -1 with it in TextView, TextAppearanceSpan.

Bug: 256995042

Test: manually test
Change-Id: Ia8334f5513cc3e5b7383b67b24b27bf2866d05ad

core/api/current.txt

@@ -16583,6 +16583,7 @@ package android.graphics.fonts {
     field public static final int FONT_WEIGHT_NORMAL = 400; // 0x190
     field public static final int FONT_WEIGHT_SEMI_BOLD = 600; // 0x258
     field public static final int FONT_WEIGHT_THIN = 100; // 0x64
+    field public static final int FONT_WEIGHT_UNSPECIFIED = -1; // 0xffffffff
   }
 
   public final class FontVariationAxis {

core/java/android/text/style/TextAppearanceSpan.java

@@ -149,7 +149,7 @@ public class TextAppearanceSpan extends MetricAffectingSpan implements Parcelabl
         }
 
         mTextFontWeight = a.getInt(com.android.internal.R.styleable
-                .TextAppearance_textFontWeight, -1);
+                .TextAppearance_textFontWeight, /*defValue*/ FontStyle.FONT_WEIGHT_UNSPECIFIED);
 
         final String localeString = a.getString(com.android.internal.R.styleable
                 .TextAppearance_textLocale);
@@ -215,7 +215,7 @@ public class TextAppearanceSpan extends MetricAffectingSpan implements Parcelabl
         mTextColorLink = linkColor;
         mTypeface = null;
 
-        mTextFontWeight = -1;
+        mTextFontWeight = FontStyle.FONT_WEIGHT_UNSPECIFIED;
         mTextLocales = null;
 
         mShadowRadius = 0.0f;
@@ -359,8 +359,8 @@ public class TextAppearanceSpan extends MetricAffectingSpan implements Parcelabl
     }
 
     /**
-     * Returns the text font weight specified by this span, or <code>-1</code>
-     * if it does not specify one.
+     * Returns the text font weight specified by this span, or
+     * <code>FontStyle.FONT_WEIGHT_UNSPECIFIED</code> if it does not specify one.
      */
     public int getTextFontWeight() {
         return mTextFontWeight;

core/java/android/widget/TextView.java

@@ -2286,11 +2286,13 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
      * @param familyName family name string, e.g. "serif"
      * @param typefaceIndex an index of the typeface enum, e.g. SANS, SERIF.
      * @param style a typeface style
-     * @param weight a weight value for the Typeface or -1 if not specified.
+     * @param weight a weight value for the Typeface or {@code FontStyle.FONT_WEIGHT_UNSPECIFIED}
+     *               if not specified.
      */
     private void setTypefaceFromAttrs(@Nullable Typeface typeface, @Nullable String familyName,
             @XMLTypefaceAttr int typefaceIndex, @Typeface.Style int style,
-            @IntRange(from = -1, to = FontStyle.FONT_WEIGHT_MAX) int weight) {
+            @IntRange(from = FontStyle.FONT_WEIGHT_UNSPECIFIED, to = FontStyle.FONT_WEIGHT_MAX)
+                    int weight) {
         if (typeface == null && familyName != null) {
             // Lookup normal Typeface from system font map.
             final Typeface normalTypeface = Typeface.create(familyName, Typeface.NORMAL);
@@ -2317,7 +2319,8 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
     }
 
     private void resolveStyleAndSetTypeface(@NonNull Typeface typeface, @Typeface.Style int style,
-            @IntRange(from = -1, to = FontStyle.FONT_WEIGHT_MAX) int weight) {
+            @IntRange(from = FontStyle.FONT_WEIGHT_UNSPECIFIED, to = FontStyle.FONT_WEIGHT_MAX)
+                    int weight) {
         if (weight >= 0) {
             weight = Math.min(FontStyle.FONT_WEIGHT_MAX, weight);
             final boolean italic = (style & Typeface.ITALIC) != 0;
@@ -4018,7 +4021,7 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
         boolean mFontFamilyExplicit = false;
         int mTypefaceIndex = -1;
         int mTextStyle = 0;
-        int mFontWeight = -1;
+        int mFontWeight = FontStyle.FONT_WEIGHT_UNSPECIFIED;
         boolean mAllCaps = false;
         int mShadowColor = 0;
         float mShadowDx = 0, mShadowDy = 0, mShadowRadius = 0;
@@ -6943,18 +6946,18 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
         if (isPassword) {
             setTransformationMethod(PasswordTransformationMethod.getInstance());
             setTypefaceFromAttrs(null/* fontTypeface */, null /* fontFamily */, MONOSPACE,
-                    Typeface.NORMAL, -1 /* weight, not specifeid */);
+                    Typeface.NORMAL, FontStyle.FONT_WEIGHT_UNSPECIFIED);
         } else if (isVisiblePassword) {
             if (mTransformation == PasswordTransformationMethod.getInstance()) {
                 forceUpdate = true;
             }
             setTypefaceFromAttrs(null/* fontTypeface */, null /* fontFamily */, MONOSPACE,
-                    Typeface.NORMAL, -1 /* weight, not specified */);
+                    Typeface.NORMAL, FontStyle.FONT_WEIGHT_UNSPECIFIED);
         } else if (wasPassword || wasVisiblePassword) {
             // not in password mode, clean up typeface and transformation
             setTypefaceFromAttrs(null/* fontTypeface */, null /* fontFamily */,
                     DEFAULT_TYPEFACE /* typeface index */, Typeface.NORMAL,
-                    -1 /* weight, not specified */);
+                    FontStyle.FONT_WEIGHT_UNSPECIFIED);
             if (mTransformation == PasswordTransformationMethod.getInstance()) {
                 forceUpdate = true;
             }

graphics/java/android/graphics/fonts/FontStyle.java

@@ -47,6 +47,10 @@ import java.util.Objects;
 public final class FontStyle {
     private static final String TAG = "FontStyle";
 
+    /**
+     * A default value when font weight is unspecified
+     */
+    public static final int FONT_WEIGHT_UNSPECIFIED = -1;
     /**
      * A minimum weight value for the font
      */