Enable searching in the AccessibilityAudioRoutingFragment only if the
page is available and the device supports hearing aid.
Bug: 353853318
Test: atest AccessibiilityAudioRoutingFragmentTest
Test: Manually. Add screen recording of search results to the bug
Test: Manually set the support to hearing aids to false and verify that searches to the page contents are not available
Flag: com.android.settings.accessibility.fix_a11y_settings_search
Change-Id: I6786c51438d49ff9bb1d458d312ec09bd16098a4
* Extract the common part into HearingAidHelper.
* Remove abstract getHearingDevice(). Change to get the hearing device when needed.
* Move several classes from Bluetooth into Accessibility
Bug: 281783079
Test: make RunSettingsRoboTests ROBOTEST_FILTER="(HearingDeviceAudioRoutingBasePreferenceControllerTest|AccessibilityHearingAidPreferenceControllerTest|HearingAidHelperTest|HearingAidAudioRoutingPreferenceControllerTest|HearingDeviceCallRoutingPreferenceControllerTest)"
Change-Id: I79049107409b7086c6dcc8d48a6323e171ed1535
