Fix TTS for GMT offset

Add TtsSpans to the GMT offset string so that TalkBack knows to
read it out in a more natural way.

Test: cd tests/robotests && mma
Bug: 30042703
Change-Id: Ifa3c540f086472bc3a315b35ba40c9497f17d2d8

tests/robotests/src/com/android/settings/ZonePickerTest.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2016 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.settings;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.text.Spanned;
+import android.text.style.TtsSpan;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
+import android.widget.SimpleAdapter;
+import android.widget.TextView;
+
+import com.android.settings.testutils.shadow.ShadowLibcoreTimeZoneNames;
+import com.android.settings.testutils.shadow.ShadowTimeZoneNames;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(
+        manifest = TestConfig.MANIFEST_PATH,
+        sdk = TestConfig.SDK_VERSION,
+        shadows = {
+                ShadowLibcoreTimeZoneNames.class,
+                ShadowLibcoreTimeZoneNames.ShadowZoneStringsCache.class,
+                ShadowTimeZoneNames.class
+        }
+)
+public class ZonePickerTest {
+
+    @Test
+    public void testConstructTimeZoneAdapter() {
+        final SimpleAdapter adapter =
+                ZonePicker.constructTimezoneAdapter(RuntimeEnvironment.application, true);
+        assertThat(adapter).isNotNull();
+
+        ViewGroup parent = new FrameLayout(RuntimeEnvironment.application);
+        ViewGroup convertView = new FrameLayout(RuntimeEnvironment.application);
+        TextView text1 = new TextView(RuntimeEnvironment.application);
+        text1.setId(android.R.id.text1);
+        convertView.addView(text1);
+        TextView text2 = new TextView(RuntimeEnvironment.application);
+        text2.setId(android.R.id.text2);
+        convertView.addView(text2);
+
+        adapter.getView(0, convertView, parent);
+        final CharSequence text = text2.getText();
+        assertThat(text).isInstanceOf(Spanned.class);
+        final TtsSpan[] spans = ((Spanned) text).getSpans(0, text.length(), TtsSpan.class);
+        // GMT offset label should have TTS spans
+        assertThat(spans.length).isGreaterThan(0);
+    }
+}