Prioritize layouts with no country code over mismatching country code (fb184b74) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/input/KeyboardLayoutManager.java

+61 −16

Original line number	Diff line number	Diff line
		@@ -664,6 +664,46 @@ class KeyboardLayoutManager implements InputManager.InputDeviceListener {
		}
		}

		/**
		* <ol>
		* <li> Layout selection Algorithm:
		* <ul>
		* <li> Choose product specific layout(KCM file with matching vendor ID and product
		* ID) </li>
		* <li> If none, then find layout based on PK layout info (based on country code
		* provided by the HID descriptor of the keyboard) </li>
		* <li> If none, then find layout based on IME layout info associated with the IME
		* subtype </li>
		* <li> If none, return null (Generic.kcm is the default) </li>
		* </ul>
		* </li>
		* <li> Finding correct layout corresponding to provided layout info:
		* <ul>
		* <li> Filter all available layouts based on the IME subtype script code </li>
		* <li> Derive locale from the provided layout info </li>
		* <li> If layoutType i.e. qwerty, azerty, etc. is provided, filter layouts by
		* layoutType and try to find matching layout to the derived locale. </li>
		* <li> If none found or layoutType not provided, then ignore the layoutType and try
		* to find matching layout to the derived locale. </li>
		* </ul>
		* </li>
		* <li> Finding matching layout for the derived locale:
		* <ul>
		* <li> If language code doesn't match, ignore the layout (We can never match a
		* layout if language code isn't matching) </li>
		* <li> If country code matches, layout score +1 </li>
		* <li> Else if country code of layout is empty, layout score +0.5 (empty country
		* code is a semi match with derived locale with country code, this is to prioritize
		* empty country code layouts over fully mismatching layouts) </li>
		* <li> If variant matches, layout score +1 </li>
		* <li> Else if variant of layout is empty, layout score +0.5 (empty variant is a
		* semi match with derive locale with country code, this is to prioritize empty
		* variant layouts over fully mismatching layouts) </li>
		* <li> Choose the layout with the best score. </li>
		* </ul>
		* </li>
		* </ol>
		*/
		@NonNull
		private static KeyboardLayoutSelectionResult getDefaultKeyboardLayoutBasedOnImeInfo(
		KeyboardIdentifier keyboardIdentifier, @Nullable ImeInfo imeInfo,
		@@ -753,8 +793,8 @@ class KeyboardLayoutManager implements InputManager.InputDeviceListener {
		private static String getMatchingLayoutForProvidedLanguageTag(List<KeyboardLayout> layoutList,
		@NonNull String languageTag) {
		Locale locale = Locale.forLanguageTag(languageTag);
		String layoutMatchingLanguage = null;
		String layoutMatchingLanguageAndCountry = null;
		String bestMatchingLayout = null;
		float bestMatchingLayoutScore = 0;

		for (KeyboardLayout layout : layoutList) {
		final LocaleList locales = layout.getLocales();
		@@ -763,23 +803,28 @@ class KeyboardLayoutManager implements InputManager.InputDeviceListener {
		if (l == null) {
		continue;
		}
		if (l.getLanguage().equals(locale.getLanguage())) {
		if (layoutMatchingLanguage == null) {
		layoutMatchingLanguage = layout.getDescriptor();
		if (!l.getLanguage().equals(locale.getLanguage())) {
		// If language mismatches: NEVER choose that layout
		continue;
		}
		float layoutScore = 1; // If language matches then score +1
		if (l.getCountry().equals(locale.getCountry())) {
		if (layoutMatchingLanguageAndCountry == null) {
		layoutMatchingLanguageAndCountry = layout.getDescriptor();
		layoutScore += 1; // If country matches then score +1
		} else if (TextUtils.isEmpty(l.getCountry())) {
		layoutScore += 0.5; // Consider empty country as semi-match
		}
		if (l.getVariant().equals(locale.getVariant())) {
		return layout.getDescriptor();
		}
		layoutScore += 1; // If variant matches then score +1
		} else if (TextUtils.isEmpty(l.getVariant())) {
		layoutScore += 0.5; // Consider empty variant as semi-match
		}
		if (layoutScore > bestMatchingLayoutScore) {
		bestMatchingLayoutScore = layoutScore;
		bestMatchingLayout = layout.getDescriptor();
		}
		}
		}
		return layoutMatchingLanguageAndCountry != null
		? layoutMatchingLanguageAndCountry : layoutMatchingLanguage;
		return bestMatchingLayout;
		}

		private void reloadKeyboardLayouts() {

tests/Input/src/com/android/server/input/KeyboardLayoutManagerTests.kt

+6 −0

Original line number	Diff line number	Diff line
		@@ -523,6 +523,12 @@ class KeyboardLayoutManagerTests {
		createImeSubtypeForLanguageTagAndLayoutType("en-Deva-US", "")
		)
		)
		// If prefer layout with empty country over mismatched country
		assertCorrectLayout(
		keyboardDevice,
		createImeSubtypeForLanguageTagAndLayoutType("en-AU", "qwerty"),
		ENGLISH_US_LAYOUT_DESCRIPTOR
		)
		}

		@Test