有没有办法知道API 23中何时触摸了设备的指纹传感器？

Question

我认为标题是不言自明的：我想知道我的设备上的指纹传感器何时被激活（通常这意味着用户现在正在用他/她的手指敲击传感器）。

我已经尝试查看API 23上的系统范围广播列表（android/sdk/platforms/android-23/data/broadcast_actions.txt中指定FingerprintManager），但我找不到任何与此相关的广播关于此事的指纹或android.app.action.ACTION_PASSWORD_CHANGED android.app.action.ACTION_PASSWORD_EXPIRING android.app.action.ACTION_PASSWORD_FAILED android.app.action.ACTION_PASSWORD_SUCCEEDED android.app.action.DEVICE_ADMIN_DISABLED android.app.action.DEVICE_ADMIN_DISABLE_REQUESTED android.app.action.DEVICE_ADMIN_ENABLED android.app.action.DEVICE_OWNER_CHANGED android.app.action.INTERRUPTION_FILTER_CHANGED android.app.action.LOCK_TASK_ENTERING android.app.action.LOCK_TASK_EXITING android.app.action.NEXT_ALARM_CLOCK_CHANGED android.app.action.NOTIFICATION_POLICY_ACCESS_GRANTED_CHANGED android.app.action.NOTIFICATION_POLICY_CHANGED android.app.action.PROFILE_PROVISIONING_COMPLETE android.app.action.SYSTEM_UPDATE_POLICY_CHANGED android.bluetooth.a2dp.profile.action.CONNECTION_STATE_CHANGED android.bluetooth.a2dp.profile.action.PLAYING_STATE_CHANGED android.bluetooth.adapter.action.CONNECTION_STATE_CHANGED android.bluetooth.adapter.action.DISCOVERY_FINISHED android.bluetooth.adapter.action.DISCOVERY_STARTED android.bluetooth.adapter.action.LOCAL_NAME_CHANGED android.bluetooth.adapter.action.SCAN_MODE_CHANGED android.bluetooth.adapter.action.STATE_CHANGED android.bluetooth.device.action.ACL_CONNECTED android.bluetooth.device.action.ACL_DISCONNECTED android.bluetooth.device.action.ACL_DISCONNECT_REQUESTED android.bluetooth.device.action.BOND_STATE_CHANGED android.bluetooth.device.action.CLASS_CHANGED android.bluetooth.device.action.FOUND android.bluetooth.device.action.NAME_CHANGED android.bluetooth.device.action.PAIRING_REQUEST android.bluetooth.device.action.UUID android.bluetooth.devicepicker.action.DEVICE_SELECTED android.bluetooth.devicepicker.action.LAUNCH android.bluetooth.headset.action.VENDOR_SPECIFIC_HEADSET_EVENT android.bluetooth.headset.profile.action.AUDIO_STATE_CHANGED android.bluetooth.headset.profile.action.CONNECTION_STATE_CHANGED android.bluetooth.input.profile.action.CONNECTION_STATE_CHANGED android.bluetooth.pan.profile.action.CONNECTION_STATE_CHANGED android.hardware.action.NEW_PICTURE android.hardware.action.NEW_VIDEO android.hardware.hdmi.action.OSD_MESSAGE android.hardware.input.action.QUERY_KEYBOARD_LAYOUTS android.intent.action.ACTION_POWER_CONNECTED android.intent.action.ACTION_POWER_DISCONNECTED android.intent.action.ACTION_SHUTDOWN android.intent.action.AIRPLANE_MODE android.intent.action.APPLICATION_RESTRICTIONS_CHANGED android.intent.action.BATTERY_CHANGED android.intent.action.BATTERY_LOW android.intent.action.BATTERY_OKAY android.intent.action.BOOT_COMPLETED android.intent.action.CAMERA_BUTTON android.intent.action.CONFIGURATION_CHANGED android.intent.action.CONTENT_CHANGED android.intent.action.DATA_SMS_RECEIVED android.intent.action.DATE_CHANGED android.intent.action.DEVICE_STORAGE_LOW android.intent.action.DEVICE_STORAGE_OK android.intent.action.DOCK_EVENT android.intent.action.DOWNLOAD_COMPLETE android.intent.action.DOWNLOAD_NOTIFICATION_CLICKED android.intent.action.DREAMING_STARTED android.intent.action.DREAMING_STOPPED android.intent.action.EXTERNAL_APPLICATIONS_AVAILABLE android.intent.action.EXTERNAL_APPLICATIONS_UNAVAILABLE android.intent.action.FETCH_VOICEMAIL android.intent.action.GTALK_CONNECTED android.intent.action.GTALK_DISCONNECTED android.intent.action.HEADSET_PLUG android.intent.action.HEADSET_PLUG android.intent.action.INPUT_METHOD_CHANGED android.intent.action.LOCALE_CHANGED android.intent.action.MANAGE_PACKAGE_STORAGE android.intent.action.MEDIA_BAD_REMOVAL android.intent.action.MEDIA_BUTTON android.intent.action.MEDIA_CHECKING android.intent.action.MEDIA_EJECT android.intent.action.MEDIA_MOUNTED android.intent.action.MEDIA_NOFS android.intent.action.MEDIA_REMOVED android.intent.action.MEDIA_SCANNER_FINISHED android.intent.action.MEDIA_SCANNER_SCAN_FILE android.intent.action.MEDIA_SCANNER_STARTED android.intent.action.MEDIA_SHARED android.intent.action.MEDIA_UNMOUNTABLE android.intent.action.MEDIA_UNMOUNTED android.intent.action.MY_PACKAGE_REPLACED android.intent.action.NEW_OUTGOING_CALL android.intent.action.NEW_VOICEMAIL android.intent.action.PACKAGE_ADDED android.intent.action.PACKAGE_CHANGED android.intent.action.PACKAGE_DATA_CLEARED android.intent.action.PACKAGE_FIRST_LAUNCH android.intent.action.PACKAGE_FULLY_REMOVED android.intent.action.PACKAGE_INSTALL android.intent.action.PACKAGE_NEEDS_VERIFICATION android.intent.action.PACKAGE_REMOVED android.intent.action.PACKAGE_REPLACED android.intent.action.PACKAGE_RESTARTED android.intent.action.PACKAGE_VERIFIED android.intent.action.PHONE_STATE android.intent.action.PROVIDER_CHANGED android.intent.action.PROXY_CHANGE android.intent.action.REBOOT android.intent.action.SCREEN_OFF android.intent.action.SCREEN_ON android.intent.action.TIMEZONE_CHANGED android.intent.action.TIME_SET android.intent.action.TIME_TICK android.intent.action.UID_REMOVED android.intent.action.USER_PRESENT android.intent.action.WALLPAPER_CHANGED android.media.ACTION_SCO_AUDIO_STATE_UPDATED android.media.AUDIO_BECOMING_NOISY android.media.RINGER_MODE_CHANGED android.media.SCO_AUDIO_STATE_CHANGED android.media.VIBRATE_SETTING_CHANGED android.media.action.CLOSE_AUDIO_EFFECT_CONTROL_SESSION android.media.action.HDMI_AUDIO_PLUG android.media.action.OPEN_AUDIO_EFFECT_CONTROL_SESSION android.net.conn.BACKGROUND_DATA_SETTING_CHANGED android.net.conn.CONNECTIVITY_CHANGE android.net.nsd.STATE_CHANGED android.net.scoring.SCORER_CHANGED android.net.scoring.SCORE_NETWORKS android.net.wifi.NETWORK_IDS_CHANGED android.net.wifi.RSSI_CHANGED android.net.wifi.SCAN_RESULTS android.net.wifi.STATE_CHANGE android.net.wifi.WIFI_STATE_CHANGED android.net.wifi.p2p.CONNECTION_STATE_CHANGE android.net.wifi.p2p.DISCOVERY_STATE_CHANGE android.net.wifi.p2p.PEERS_CHANGED android.net.wifi.p2p.STATE_CHANGED android.net.wifi.p2p.THIS_DEVICE_CHANGED android.net.wifi.supplicant.CONNECTION_CHANGE android.net.wifi.supplicant.STATE_CHANGE android.nfc.action.ADAPTER_STATE_CHANGED android.os.action.DEVICE_IDLE_MODE_CHANGED android.os.action.POWER_SAVE_MODE_CHANGED android.provider.Telephony.SIM_FULL android.provider.Telephony.SMS_CB_RECEIVED android.provider.Telephony.SMS_DELIVER android.provider.Telephony.SMS_EMERGENCY_CB_RECEIVED android.provider.Telephony.SMS_RECEIVED android.provider.Telephony.SMS_REJECTED android.provider.Telephony.SMS_SERVICE_CATEGORY_PROGRAM_DATA_RECEIVED android.provider.Telephony.WAP_PUSH_DELIVER android.provider.Telephony.WAP_PUSH_RECEIVED android.speech.tts.TTS_QUEUE_PROCESSING_COMPLETED android.speech.tts.engine.TTS_DATA_INSTALLED 。

我认为这一壮举的主要原因是您只需点击传感器即可唤醒配备Nexus Imprint的设备。这基本上意味着设备在任何给定时间都在监听传感器上的任何输入，对吗？

我只对传感器的触摸事件感兴趣 - 而不是指纹数据本身。

对于那些想知道的人，以下是我在上面提到的文件中指定的所有API 23的系统范围广播：

  <div data-role="header">
    <h1>Foo</h1>
  </div>

  <div data-role="content">
    <p>I'm first in the source order so I'm shown as the first page.</p>
    <p>View internal page called <a id="barclick" href="#bar">bar</a></p>
  </div>

  <div data-role="footer">
    <h4>Page Footer</h4>
  </div>

</div>

<!-- Start of second page -->
<div data-role="page" id="bar">

  <div data-role="header">
    <h1>Bar</h1>
  </div>

  <div data-role="content">
    <p>I'm the second in the source order so I'm hidden when the page loads. I'm just shown if a link that references my id is beeing clicked.</p>
    <p><a href="#foo">Back to foo</a></p>
  </div>

  <div data-role="footer">
    <h4>Page Footer</h4>
  </div>

</div>