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蓝牙耳机播放音频无声，可能是协议不支持，修改下面配置文件：
把下面协议的值为 false 的改为 true ，开启相应的功能：
/packages/apps/Bluetooth/res/values/config.xml
<resources> <bool name="profile_supported_a2dp">true</bool> <bool name="profile_supported_a2dp_sink">false</bool> <bool name="profile_supported_hdp">true</bool> <bool name="profile_supported_hs_hfp">true</bool> <bool name="profile_supported_hfpclient">false</bool> <bool name="profile_supported_hid_host">true</bool> <bool name="profile_supported_opp">true</bool> <bool name="profile_supported_pan">true</bool> <bool name="profile_supported_pbap">true</bool> <bool name="profile_supported_gatt">true</bool> <bool name="pbap_include_photos_in_vcard">true</bool> <bool name="pbap_use_profile_for_owner_vcard">true</bool> <bool name="profile_supported_map">true</bool> <bool name="profile_supported_avrcp_target">true</bool> <bool name="profile_supported_avrcp_controller">false</bool> <bool name="profile_supported_sap">false</bool> <bool name="profile_supported_pbapclient">false</bool> <bool name="profile_supported_mapmce">false</bool> <bool name="profile_supported_hid_device">true</bool> <bool name="profile_supported_hearing_aid">false</bool>