Add compatibility utility class for LocaleSpan

This is a groundwork for enabling LocaleSpan support.
LocaleSpan is available in API Level 17 and later. We need some
abstraction layer as usual.

BUG: 16029304
Change-Id: Iead1afdc540216edb1b17f91a40d9edb2e790168
This commit is contained in:
Yohei Yukawa 2014-07-04 20:31:34 +09:00
parent 3895d7f8dc
commit a92fead202
2 changed files with 97 additions and 0 deletions

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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.inputmethod.compat;
import com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.compat.CompatUtils;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.Locale;
@UsedForTesting
public final class LocaleSpanCompatUtils {
// Note that LocaleSpan(Locale locale) has been introduced in API level 17
// (Build.VERSION_CODE.JELLY_BEAN_MR1).
private static Class<?> getLocalSpanClass() {
try {
return Class.forName("android.text.style.LocaleSpan");
} catch (ClassNotFoundException e) {
return null;
}
}
private static final Constructor<?> LOCALE_SPAN_CONSTRUCTOR;
private static final Method LOCALE_SPAN_GET_LOCALE;
static {
final Class<?> localeSpanClass = getLocalSpanClass();
LOCALE_SPAN_CONSTRUCTOR = CompatUtils.getConstructor(localeSpanClass, Locale.class);
LOCALE_SPAN_GET_LOCALE = CompatUtils.getMethod(localeSpanClass, "getLocale");
}
@UsedForTesting
public static boolean isLocaleSpanAvailable() {
return (LOCALE_SPAN_CONSTRUCTOR != null && LOCALE_SPAN_GET_LOCALE != null);
}
@UsedForTesting
public static Object newLocaleSpan(final Locale locale) {
return CompatUtils.newInstance(LOCALE_SPAN_CONSTRUCTOR, locale);
}
@UsedForTesting
public static Locale getLocaleFromLocaleSpan(final Object localeSpan) {
return (Locale) CompatUtils.invoke(localeSpan, null, LOCALE_SPAN_GET_LOCALE);
}
}

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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.inputmethod.compat;
import android.os.Build;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.SmallTest;
import java.util.Locale;
@SmallTest
public class LocaleSpanCompatUtilsTests extends AndroidTestCase {
public void testInstantiatable() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {
// LocaleSpan isn't yet available.
return;
}
assertTrue(LocaleSpanCompatUtils.isLocaleSpanAvailable());
final Object japaneseLocaleSpan = LocaleSpanCompatUtils.newLocaleSpan(Locale.JAPANESE);
assertNotNull(japaneseLocaleSpan);
assertEquals(Locale.JAPANESE,
LocaleSpanCompatUtils.getLocaleFromLocaleSpan(japaneseLocaleSpan));
}
}