Implement DistanceMeasurementManager in Bluetooth app (000cdd23) · Commits · e / os / android_packages_modules_Bluetooth

android/app/jni/com_android_bluetooth_gatt.cpp

+128 −1

Original line number	Diff line number	Diff line
		@@ -190,14 +190,23 @@ static jmethodID method_onSyncLost;
		static jmethodID method_onSyncReport;
		static jmethodID method_onSyncStarted;
		static jmethodID method_onSyncTransferredCallback;

		/**
		* Static variables
		* Distance Measurement callback methods
		*/
		static jmethodID method_onDistanceMeasurementStarted;
		static jmethodID method_onDistanceMeasurementStartFail;
		static jmethodID method_onDistanceMeasurementStopped;
		static jmethodID method_onDistanceMeasurementResult;

		/**
		* Static variables
		*/
		static const btgatt_interface_t* sGattIf = NULL;
		static jobject mCallbacksObj = NULL;
		static jobject mAdvertiseCallbacksObj = NULL;
		static jobject mPeriodicScanCallbacksObj = NULL;
		static jobject mDistanceMeasurementCallbacksObj = NULL;
		static std::shared_mutex callbacks_mutex;

		/**
		@@ -1150,6 +1159,63 @@ class JniScanningCallbacks : ScanningCallbacks {
		}
		};

		class JniDistanceMeasurementCallbacks : DistanceMeasurementCallbacks {
		public:
		static DistanceMeasurementCallbacks* GetInstance() {
		static DistanceMeasurementCallbacks* instance =
		new JniDistanceMeasurementCallbacks();
		return instance;
		}

		void OnDistanceMeasurementStarted(RawAddress address, uint8_t method) {
		std::shared_lock<std::shared_mutex> lock(callbacks_mutex);
		CallbackEnv sCallbackEnv(__func__);
		if (!sCallbackEnv.valid() \|\| !mDistanceMeasurementCallbacksObj) return;
		ScopedLocalRef<jstring> addr(sCallbackEnv.get(),
		bdaddr2newjstr(sCallbackEnv.get(), &address));
		sCallbackEnv->CallVoidMethod(mDistanceMeasurementCallbacksObj,
		method_onDistanceMeasurementStarted,
		addr.get(), method);
		}
		void OnDistanceMeasurementStartFail(RawAddress address, uint8_t reason,
		uint8_t method) {
		std::shared_lock<std::shared_mutex> lock(callbacks_mutex);
		CallbackEnv sCallbackEnv(__func__);
		if (!sCallbackEnv.valid() \|\| !mDistanceMeasurementCallbacksObj) return;
		ScopedLocalRef<jstring> addr(sCallbackEnv.get(),
		bdaddr2newjstr(sCallbackEnv.get(), &address));
		sCallbackEnv->CallVoidMethod(mDistanceMeasurementCallbacksObj,
		method_onDistanceMeasurementStartFail,
		addr.get(), reason, method);
		}
		void OnDistanceMeasurementStopped(RawAddress address, uint8_t reason,
		uint8_t method) {
		std::shared_lock<std::shared_mutex> lock(callbacks_mutex);
		CallbackEnv sCallbackEnv(__func__);
		if (!sCallbackEnv.valid() \|\| !mDistanceMeasurementCallbacksObj) return;
		ScopedLocalRef<jstring> addr(sCallbackEnv.get(),
		bdaddr2newjstr(sCallbackEnv.get(), &address));
		sCallbackEnv->CallVoidMethod(mDistanceMeasurementCallbacksObj,
		method_onDistanceMeasurementStopped,
		addr.get(), reason, method);
		}

		void OnDistanceMeasurementResult(RawAddress address, uint32_t centimeter,
		uint32_t error_centimeter, int azimuth_angle,
		int error_azimuth_angle, int altitude_angle,
		int error_altitude_angle, uint8_t method) {
		std::shared_lock<std::shared_mutex> lock(callbacks_mutex);
		CallbackEnv sCallbackEnv(__func__);
		if (!sCallbackEnv.valid() \|\| !mDistanceMeasurementCallbacksObj) return;
		ScopedLocalRef<jstring> addr(sCallbackEnv.get(),
		bdaddr2newjstr(sCallbackEnv.get(), &address));
		sCallbackEnv->CallVoidMethod(
		mDistanceMeasurementCallbacksObj, method_onDistanceMeasurementResult,
		addr.get(), centimeter, error_centimeter, azimuth_angle,
		error_azimuth_angle, altitude_angle, error_altitude_angle, method);
		}
		};

		/**
		* Native function definitions
		*/
		@@ -1309,6 +1375,8 @@ static void initializeNative(JNIEnv* env, jobject object) {
		sGattIf->advertiser->RegisterCallbacks(
		JniAdvertisingCallbacks::GetInstance());
		sGattIf->scanner->RegisterCallbacks(JniScanningCallbacks::GetInstance());
		sGattIf->distance_measurement_manager->RegisterDistanceMeasurementCallbacks(
		JniDistanceMeasurementCallbacks::GetInstance());

		mCallbacksObj = env->NewGlobalRef(object);

		@@ -2514,6 +2582,51 @@ static void gattTestNative(JNIEnv* env, jobject object, jint command,
		sGattIf->client->test_command(command, params);
		}

		static void distanceMeasurementClassInitNative(JNIEnv* env, jclass clazz) {
		method_onDistanceMeasurementStarted = env->GetMethodID(
		clazz, "onDistanceMeasurementStarted", "(Ljava/lang/String;I)V");
		method_onDistanceMeasurementStartFail = env->GetMethodID(
		clazz, "onDistanceMeasurementStartFail", "(Ljava/lang/String;II)V");
		method_onDistanceMeasurementStopped = env->GetMethodID(
		clazz, "onDistanceMeasurementStopped", "(Ljava/lang/String;II)V");
		method_onDistanceMeasurementResult = env->GetMethodID(
		clazz, "onDistanceMeasurementResult", "(Ljava/lang/String;IIIIIII)V");
		}

		static void distanceMeasurementInitializeNative(JNIEnv* env, jobject object) {
		std::unique_lock<std::shared_mutex> lock(callbacks_mutex);
		if (mDistanceMeasurementCallbacksObj != NULL) {
		ALOGW("Cleaning up Advertise callback object");
		env->DeleteGlobalRef(mDistanceMeasurementCallbacksObj);
		mDistanceMeasurementCallbacksObj = NULL;
		}

		mDistanceMeasurementCallbacksObj = env->NewGlobalRef(object);
		}

		static void distanceMeasurementCleanupNative(JNIEnv* env, jobject object) {
		std::unique_lock<std::shared_mutex> lock(callbacks_mutex);
		if (mDistanceMeasurementCallbacksObj != NULL) {
		env->DeleteGlobalRef(mDistanceMeasurementCallbacksObj);
		mDistanceMeasurementCallbacksObj = NULL;
		}
		}

		static void startDistanceMeasurementNative(JNIEnv* env, jobject object,
		jstring address, jint frequency,
		jint method) {
		if (!sGattIf) return;
		sGattIf->distance_measurement_manager->StartDistanceMeasurement(
		str2addr(env, address), frequency, method);
		}

		static void stopDistanceMeasurementNative(JNIEnv* env, jobject object,
		jstring address, jint method) {
		if (!sGattIf) return;
		sGattIf->distance_measurement_manager->StopDistanceMeasurement(
		str2addr(env, address), method);
		}

		/**
		* JNI function definitinos
		*/
		@@ -2592,6 +2705,17 @@ static JNINativeMethod sScanMethods[] = {
		(void*)gattSetScanParametersNative},
		};

		// JNI functions defined in DistanceMeasurementManager class.
		static JNINativeMethod sDistanceMeasurementMethods[] = {
		{"classInitNative", "()V", (void*)distanceMeasurementClassInitNative},
		{"initializeNative", "()V", (void*)distanceMeasurementInitializeNative},
		{"cleanupNative", "()V", (void*)distanceMeasurementCleanupNative},
		{"startDistanceMeasurementNative", "(Ljava/lang/String;II)V",
		(void*)startDistanceMeasurementNative},
		{"stopDistanceMeasurementNative", "(Ljava/lang/String;I)V",
		(void*)stopDistanceMeasurementNative},
		};

		// JNI functions defined in GattNativeInterface class.
		static JNINativeMethod sMethods[] = {
		{"classInitNative", "()V", (void*)classInitNative},
		@@ -2678,6 +2802,9 @@ int register_com_android_bluetooth_gatt(JNIEnv* env) {
		register_success &= jniRegisterNativeMethods(
		env, "com/android/bluetooth/gatt/PeriodicScanManager",
		sPeriodicScanMethods, NELEM(sPeriodicScanMethods));
		register_success &= jniRegisterNativeMethods(
		env, "com/android/bluetooth/gatt/DistanceMeasurementNativeInterface",
		sDistanceMeasurementMethods, NELEM(sDistanceMeasurementMethods));
		return register_success &
		jniRegisterNativeMethods(
		env, "com/android/bluetooth/gatt/GattNativeInterface", sMethods,

android/app/src/com/android/bluetooth/gatt/DistanceMeasurementManager.java

0 → 100644

+344 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright 2022 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.bluetooth.gatt;

		import android.bluetooth.BluetoothDevice;
		import android.bluetooth.BluetoothStatusCodes;
		import android.bluetooth.BluetoothUtils;
		import android.bluetooth.le.DistanceMeasurementMethod;
		import android.bluetooth.le.DistanceMeasurementParams;
		import android.bluetooth.le.DistanceMeasurementResult;
		import android.bluetooth.le.IDistanceMeasurementCallback;
		import android.os.HandlerThread;
		import android.os.RemoteException;
		import android.util.Log;

		import com.android.bluetooth.btservice.AdapterService;
		import com.android.internal.annotations.VisibleForTesting;

		import java.util.HashSet;
		import java.util.UUID;
		import java.util.concurrent.ConcurrentHashMap;

		/**
		* Manages distnace measurement operations and interacts with Gabeldorsche stack.
		*
		* @hide
		*/
		@VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
		public class DistanceMeasurementManager {
		private static final boolean DBG = GattServiceConfig.DBG;
		private static final String TAG = "DistanceMeasurementManager";

		private static final int RSSI_FREQUENCY_LOW = 3000;
		private static final int RSSI_FREQUENCY_MEDIUM = 1000;
		private static final int RSSI_FREQUENCY_HIGH = 500;

		private final AdapterService mAdapterService;
		private HandlerThread mHandlerThread;
		DistanceMeasurementNativeInterface mDistanceMeasurementNativeInterface;
		private ConcurrentHashMap<String, HashSet<DistanceMeasurementTracker>> mRssiTrackers =
		new ConcurrentHashMap<>();

		/**
		* Constructor of {@link DistanceMeasurementManager}.
		*/
		DistanceMeasurementManager(AdapterService adapterService) {
		mAdapterService = adapterService;
		}

		/**
		* Start a {@link HandlerThread} that handles distnace measurement operations.
		*/
		void start() {
		mHandlerThread = new HandlerThread("DistanceMeasurementManager");
		mHandlerThread.start();
		mDistanceMeasurementNativeInterface = DistanceMeasurementNativeInterface.getInstance();
		mDistanceMeasurementNativeInterface.init(this);
		}

		void cleanup() {
		mDistanceMeasurementNativeInterface.cleanup();
		}

		DistanceMeasurementMethod[] getSupportedDistanceMeasurementMethods() {
		DistanceMeasurementMethod rssi = new DistanceMeasurementMethod.Builder(
		DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_RSSI).build();
		DistanceMeasurementMethod[] methods = {rssi};
		return methods;
		}


		void startDistanceMeasurement(UUID uuid, DistanceMeasurementParams params,
		IDistanceMeasurementCallback callback) {
		Log.i(TAG, "startDistanceMeasurement device:" + params.getDevice().getAnonymizedAddress()
		+ ", method: " + params.getMethod());
		String identityAddress = mAdapterService.getIdentityAddress(
		params.getDevice().getAddress());
		logd("Get identityAddress: " + params.getDevice().getAnonymizedAddress() + " => "
		+ BluetoothUtils.toAnonymizedAddress(identityAddress));

		int frequencyValue = getFrequencyValue(params.getFrequency(), params.getMethod());
		if (frequencyValue == -1) {
		invokeStartFail(callback, params.getDevice(),
		BluetoothStatusCodes.ERROR_BAD_PARAMETERS);
		return;
		}

		DistanceMeasurementTracker tracker = new DistanceMeasurementTracker(
		this, params, identityAddress, uuid, frequencyValue, callback);

		switch (params.getMethod()) {
		case DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_AUTO:
		case DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_RSSI:
		startRssiTracker(tracker);
		break;
		default:
		invokeStartFail(callback, params.getDevice(),
		BluetoothStatusCodes.ERROR_BAD_PARAMETERS);
		}
		}

		private synchronized void startRssiTracker(DistanceMeasurementTracker tracker) {
		mRssiTrackers.putIfAbsent(tracker.mIdentityAddress,
		new HashSet<DistanceMeasurementTracker>());
		HashSet<DistanceMeasurementTracker> set = mRssiTrackers.get(tracker.mIdentityAddress);
		if (set.contains(tracker)) {
		Log.w(TAG, "Already registered");
		return;
		}
		set.add(tracker);
		mDistanceMeasurementNativeInterface.startDistanceMeasurement(tracker.mIdentityAddress,
		tracker.mFrequency, DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_RSSI);
		}

		int stopDistanceMeasurement(UUID uuid, BluetoothDevice device, int method,
		boolean timeout) {
		Log.i(TAG, "stopDistanceMeasurement device:" + device.getAnonymizedAddress()
		+ ", method: " + method + " timeout " + timeout);
		String identityAddress = mAdapterService.getIdentityAddress(device.getAddress());
		logd("Get identityAddress: " + device.getAnonymizedAddress() + " => "
		+ BluetoothUtils.toAnonymizedAddress(identityAddress));

		switch (method) {
		case DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_AUTO:
		case DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_RSSI:
		return stopRssiTracker(uuid, identityAddress, timeout);
		default:
		Log.w(TAG, "stopDistanceMeasurement with invalid method:" + method);
		return BluetoothStatusCodes.DISTANCE_MEASUREMENT_ERROR_INTERNAL;
		}
		}

		private synchronized int stopRssiTracker(UUID uuid, String identityAddress,
		boolean timeout) {
		HashSet<DistanceMeasurementTracker> set = mRssiTrackers.get(identityAddress);
		if (set == null) {
		Log.w(TAG, "Can't find rssi tracker");
		return BluetoothStatusCodes.DISTANCE_MEASUREMENT_ERROR_INTERNAL;
		}

		for (DistanceMeasurementTracker tracker : set) {
		if (tracker.equals(uuid, identityAddress)) {
		int reason = timeout ? BluetoothStatusCodes.ERROR_TIMEOUT :
		BluetoothStatusCodes.REASON_LOCAL_APP_REQUEST;
		invokeOnStopped(tracker.mCallback, tracker.mDevice, reason);
		tracker.cancelTimer();
		set.remove(tracker);
		break;
		}
		}

		if (set.isEmpty()) {
		logd("no rssi tracker");
		mRssiTrackers.remove(identityAddress);
		mDistanceMeasurementNativeInterface.stopDistanceMeasurement(identityAddress,
		DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_RSSI);
		}
		return BluetoothStatusCodes.SUCCESS;
		}

		private void invokeStartFail(IDistanceMeasurementCallback callback, BluetoothDevice device,
		int reason) {
		try {
		callback.onStartFail(device, reason);
		} catch (RemoteException e) {
		Log.e(TAG, "Exception: " + e);
		}
		}

		private void invokeOnStopped(IDistanceMeasurementCallback callback, BluetoothDevice device,
		int reason) {
		try {
		callback.onStopped(device, reason);
		} catch (RemoteException e) {
		Log.e(TAG, "Exception: " + e);
		}
		}

		/**
		* Convert frequency into value in ms
		*/
		private int getFrequencyValue(int frequency, int method) {
		switch (method) {
		case DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_AUTO:
		case DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_RSSI:
		switch (frequency) {
		case DistanceMeasurementParams.REPORT_FREQUENCY_LOW:
		return RSSI_FREQUENCY_LOW;
		case DistanceMeasurementParams.REPORT_FREQUENCY_MEDIUM:
		return RSSI_FREQUENCY_MEDIUM;
		case DistanceMeasurementParams.REPORT_FREQUENCY_HIGH:
		return RSSI_FREQUENCY_HIGH;
		}
		break;
		default:

		}
		Log.w(TAG, "getFrequencyValue fail frequency:" + frequency + ", method:" + method);
		return -1;
		}

		void onDistanceMeasurementStarted(String address, int method) {
		logd("onDistanceMeasurementStarted address:" + BluetoothUtils.toAnonymizedAddress(address)
		+ ", method:" + method);
		switch (method) {
		case DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_RSSI:
		handleRssiStarted(address);
		break;
		default:
		Log.w(TAG, "onDistanceMeasurementResult: invalid method " + method);
		}
		}

		void handleRssiStarted(String address) {
		HashSet<DistanceMeasurementTracker> set = mRssiTrackers.get(address);
		if (set == null) {
		Log.w(TAG, "Can't find rssi tracker");
		return;
		}
		for (DistanceMeasurementTracker tracker : set) {
		try {
		if (!tracker.mStarted) {
		tracker.mStarted = true;
		tracker.mCallback.onStarted(tracker.mDevice);
		tracker.startTimer(mHandlerThread.getLooper());
		}
		} catch (RemoteException e) {
		Log.e(TAG, "Exception: " + e);
		}
		}
		}

		void onDistanceMeasurementStartFail(String address, int reason, int method) {
		logd("onDistanceMeasurementStartFail address:" + BluetoothUtils.toAnonymizedAddress(address)
		+ ", method:" + method);
		switch (method) {
		case DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_RSSI:
		handleRssiStartFail(address, reason);
		break;
		default:
		Log.w(TAG, "onDistanceMeasurementStartFail: invalid method " + method);
		}
		}

		void handleRssiStartFail(String address, int reason) {
		HashSet<DistanceMeasurementTracker> set = mRssiTrackers.get(address);
		if (set == null) {
		Log.w(TAG, "Can't find rssi tracker");
		return;
		}
		for (DistanceMeasurementTracker tracker : set) {
		if (!tracker.mStarted) {
		invokeStartFail(tracker.mCallback, tracker.mDevice, reason);
		}
		}
		synchronized (set) {
		set.removeIf(tracker -> !tracker.mStarted);
		}
		}

		void onDistanceMeasurementStopped(String address, int reason, int method) {
		logd("onDistanceMeasurementStopped address:" + BluetoothUtils.toAnonymizedAddress(address)
		+ ", reason:" + reason + ", method:" + method);
		switch (method) {
		case DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_RSSI:
		handleRssiStopped(address, reason);
		break;
		default:
		Log.w(TAG, "onDistanceMeasurementStopped: invalid method " + method);
		}
		}

		void handleRssiStopped(String address, int reason) {
		HashSet<DistanceMeasurementTracker> set = mRssiTrackers.get(address);
		if (set == null) {
		Log.w(TAG, "Can't find rssi tracker");
		return;
		}
		for (DistanceMeasurementTracker tracker : set) {
		if (tracker.mStarted) {
		tracker.cancelTimer();
		invokeOnStopped(tracker.mCallback, tracker.mDevice, reason);
		}
		}
		synchronized (set) {
		set.removeIf(tracker -> tracker.mStarted);
		}
		}

		void onDistanceMeasurementResult(String address, int centimeter, int errorCentimeter,
		int azimuthAngle, int errorAzimuthAngle, int altitudeAngle, int errorAltitudeAngle,
		int method) {
		logd("onDistanceMeasurementResult " + BluetoothUtils.toAnonymizedAddress(address)
		+ ", centimeter " + centimeter);
		switch (method) {
		case DistanceMeasurementMethod.DISTANCE_MEASUREMENT_METHOD_RSSI:
		DistanceMeasurementResult result = new DistanceMeasurementResult.Builder(
		centimeter / 100.0, errorCentimeter / 100.0).build();
		handleRssiResult(address, result);
		break;
		default:
		Log.w(TAG, "onDistanceMeasurementResult: invalid method " + method);
		}
		}

		void handleRssiResult(String address, DistanceMeasurementResult result) {
		HashSet<DistanceMeasurementTracker> set = mRssiTrackers.get(address);
		if (set == null) {
		Log.w(TAG, "Can't find rssi tracker");
		return;
		}
		for (DistanceMeasurementTracker tracker : set) {
		try {
		if (!tracker.mStarted) {
		continue;
		}
		tracker.mCallback.onResult(tracker.mDevice, result);
		} catch (RemoteException e) {
		Log.e(TAG, "Exception: " + e);
		}
		}
		}

		/** Logs the message in debug ROM. */
		private static void logd(String msg) {
		if (DBG) {
		Log.d(TAG, msg);
		}
		}
		}

android/app/src/com/android/bluetooth/gatt/DistanceMeasurementNativeInterface.java

0 → 100644

+98 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright 2023 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.bluetooth.gatt;

		import com.android.internal.annotations.VisibleForTesting;

		/**
		* Distance Measurement Native Interface to/from JNI.
		*
		* @hide
		*/
		@VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
		public class DistanceMeasurementNativeInterface {
		private static DistanceMeasurementNativeInterface sInterface;
		private static final Object INSTANCE_LOCK = new Object();
		private DistanceMeasurementManager mDistanceMeasurementManager;

		private DistanceMeasurementNativeInterface() {}

		/**
		* This class is a singleton because native library should only be loaded once
		*
		* @return default instance
		*/
		public static DistanceMeasurementNativeInterface getInstance() {
		synchronized (INSTANCE_LOCK) {
		if (sInterface == null) {
		sInterface = new DistanceMeasurementNativeInterface();
		}
		}
		return sInterface;
		}

		void init(DistanceMeasurementManager manager) {
		mDistanceMeasurementManager = manager;
		initializeNative();
		}

		void cleanup() {
		cleanupNative();
		}

		void startDistanceMeasurement(String address, int frequency, int method) {
		startDistanceMeasurementNative(address, frequency, method);
		}

		void stopDistanceMeasurement(String address, int method) {
		stopDistanceMeasurementNative(address, method);
		}

		void onDistanceMeasurementStarted(String address, int method) {
		mDistanceMeasurementManager.onDistanceMeasurementStarted(address, method);
		}

		void onDistanceMeasurementStartFail(String address, int reason, int method) {
		mDistanceMeasurementManager.onDistanceMeasurementStartFail(address, reason, method);
		}

		void onDistanceMeasurementStopped(String address, int reason, int method) {
		mDistanceMeasurementManager.onDistanceMeasurementStopped(address, reason, method);
		}

		void onDistanceMeasurementResult(String address, int centimeter, int errorCentimeter,
		int azimuthAngle, int errorAzimuthAngle, int altitudeAngle, int errorAltitudeAngle,
		int method) {
		mDistanceMeasurementManager.onDistanceMeasurementResult(address, centimeter,
		errorCentimeter, azimuthAngle, errorAzimuthAngle, altitudeAngle, errorAltitudeAngle,
		method);
		}

		static {
		classInitNative();
		}

		private static native void classInitNative();

		private native void initializeNative();

		private native void cleanupNative();

		private native void startDistanceMeasurementNative(String address, int frequency, int method);

		private native void stopDistanceMeasurementNative(String address, int method);
		}

android/app/src/com/android/bluetooth/gatt/DistanceMeasurementTracker.java

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+108 −0

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android/app/src/com/android/bluetooth/gatt/GattService.java

+18 −14

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