# android.net.wifi.rtt Added in[API level 28](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) # android.net.wifi.rtt *** ** * ** *** [Kotlin](https://developer.android.com/reference/kotlin/android/net/wifi/rtt/package-summary "View this page in Kotlin")\|Java Provides classes which allow applications to use Wi-Fi RTT (IEEE 802.11mc) to measure distance to supporting Access Points and peer devices. The primary entry point to Wi-Fi RTT capabilities is the[WifiRttManager](https://developer.android.com/reference/android/net/wifi/rtt/WifiRttManager)class, which is acquired by calling[Context.getSystemService(Context.WIFI_RTT_RANGING_SERVICE)](https://developer.android.com/reference/android/content/Context#getSystemService(java.lang.String)) Some APIs may require the following user permissions: - [ACCESS_WIFI_STATE](https://developer.android.com/reference/android/Manifest.permission#ACCESS_WIFI_STATE) - [CHANGE_WIFI_STATE](https://developer.android.com/reference/android/Manifest.permission#CHANGE_WIFI_STATE) - [ACCESS_FINE_LOCATION](https://developer.android.com/reference/android/Manifest.permission#ACCESS_FINE_LOCATION) Usage of the API is also gated by the device's Location Mode: whether it permits Wi-Fi based location to be queried. **Note:** Not all Android-powered devices support Wi-Fi RTT functionality. If your application only works with Wi-Fi RTT (i.e. it should only be installed on devices which support Wi-Fi RTT), declare so with a[``](https://developer.android.com/guide/topics/manifest/uses-feature-element)element in the manifest file: ``` ... ``` Alternatively, if your application does not require Wi-Fi RTT but can take advantage of it if available, you can perform the check at run-time in your code using[hasSystemFeature(String)](https://developer.android.com/reference/android/content/pm/PackageManager#hasSystemFeature(java.lang.String))with[FEATURE_WIFI_RTT](https://developer.android.com/reference/android/content/pm/PackageManager#FEATURE_WIFI_RTT): ``` getPackageManager().hasSystemFeature(PackageManager.FEATURE_WIFI_RTT) ``` For an example of this functionality, see[Wi-Fi location: ranging with RTT](https://developer.android.com/guide/topics/connectivity/wifi-rtt). ## Classes |-------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [CivicLocationKeys](https://developer.android.com/reference/android/net/wifi/rtt/CivicLocationKeys) | Civic Address key types used to define address elements. | | [PasnConfig](https://developer.android.com/reference/android/net/wifi/rtt/PasnConfig) | Pre-association security negotiation (PASN) configuration. | | [PasnConfig.Builder](https://developer.android.com/reference/android/net/wifi/rtt/PasnConfig.Builder) | Builder for[PasnConfig](https://developer.android.com/reference/android/net/wifi/rtt/PasnConfig) | | [RangingRequest](https://developer.android.com/reference/android/net/wifi/rtt/RangingRequest) | Defines the ranging request to other devices. | | [RangingRequest.Builder](https://developer.android.com/reference/android/net/wifi/rtt/RangingRequest.Builder) | Builder class used to construct[RangingRequest](https://developer.android.com/reference/android/net/wifi/rtt/RangingRequest)objects. | | [RangingResult](https://developer.android.com/reference/android/net/wifi/rtt/RangingResult) | Ranging result for a request started by[WifiRttManager.startRanging(RangingRequest, java.util.concurrent.Executor, RangingResultCallback)](https://developer.android.com/reference/android/net/wifi/rtt/WifiRttManager#startRanging(android.net.wifi.rtt.RangingRequest,%20java.util.concurrent.Executor,%20android.net.wifi.rtt.RangingResultCallback)). | | [RangingResult.Builder](https://developer.android.com/reference/android/net/wifi/rtt/RangingResult.Builder) | Builder class used to construct[RangingResult](https://developer.android.com/reference/android/net/wifi/rtt/RangingResult)objects. | | [RangingResultCallback](https://developer.android.com/reference/android/net/wifi/rtt/RangingResultCallback) | Base class for ranging result callbacks. | | [ResponderConfig](https://developer.android.com/reference/android/net/wifi/rtt/ResponderConfig) | Defines the configuration of an IEEE 802.11mc Responder. | | [ResponderConfig.Builder](https://developer.android.com/reference/android/net/wifi/rtt/ResponderConfig.Builder) | Builder class used to construct[ResponderConfig](https://developer.android.com/reference/android/net/wifi/rtt/ResponderConfig)objects. | | [ResponderLocation](https://developer.android.com/reference/android/net/wifi/rtt/ResponderLocation) | ResponderLocation is both a Location Configuration Information (LCI) decoder and a Location Civic Report (LCR) decoder for information received from a Wi-Fi Access Point (AP) during Wi-Fi RTT ranging process. | | [SecureRangingConfig](https://developer.android.com/reference/android/net/wifi/rtt/SecureRangingConfig) | Secure ranging configuration. | | [SecureRangingConfig.Builder](https://developer.android.com/reference/android/net/wifi/rtt/SecureRangingConfig.Builder) | Builder for[SecureRangingConfig](https://developer.android.com/reference/android/net/wifi/rtt/SecureRangingConfig) | | [WifiRttManager](https://developer.android.com/reference/android/net/wifi/rtt/WifiRttManager) | This class provides the primary API for measuring distance (range) to other devices using the IEEE 802.11mc Wi-Fi Round Trip Time (RTT) technology. | - ## Classes - [CivicLocationKeys](https://developer.android.com/reference/android/net/wifi/rtt/CivicLocationKeys) - [PasnConfig](https://developer.android.com/reference/android/net/wifi/rtt/PasnConfig) - [PasnConfig.Builder](https://developer.android.com/reference/android/net/wifi/rtt/PasnConfig.Builder) - [RangingRequest](https://developer.android.com/reference/android/net/wifi/rtt/RangingRequest) - [RangingRequest.Builder](https://developer.android.com/reference/android/net/wifi/rtt/RangingRequest.Builder) - [RangingResult](https://developer.android.com/reference/android/net/wifi/rtt/RangingResult) - [RangingResult.Builder](https://developer.android.com/reference/android/net/wifi/rtt/RangingResult.Builder) - [RangingResultCallback](https://developer.android.com/reference/android/net/wifi/rtt/RangingResultCallback) - [ResponderConfig](https://developer.android.com/reference/android/net/wifi/rtt/ResponderConfig) - [ResponderConfig.Builder](https://developer.android.com/reference/android/net/wifi/rtt/ResponderConfig.Builder) - [ResponderLocation](https://developer.android.com/reference/android/net/wifi/rtt/ResponderLocation) - [SecureRangingConfig](https://developer.android.com/reference/android/net/wifi/rtt/SecureRangingConfig) - [SecureRangingConfig.Builder](https://developer.android.com/reference/android/net/wifi/rtt/SecureRangingConfig.Builder) - [WifiRttManager](https://developer.android.com/reference/android/net/wifi/rtt/WifiRttManager)