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package android.net.wifi.rtt;
import static android.Manifest.permission.ACCESS_COARSE_LOCATION;
import static android.Manifest.permission.ACCESS_WIFI_STATE;
import static android.Manifest.permission.CHANGE_WIFI_STATE;
import android.annotation.Nullable;
import android.annotation.RequiresPermission;
import android.annotation.SystemService;
import android.content.Context;
import android.os.Binder;
import android.os.Handler;
import android.os.Looper;
import android.os.RemoteException;
import android.util.Log;
import java.util.List;
/**
* 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.
* <p>
* The devices which can be ranged include:
* <li>Access Points (APs)
* <p>
* Ranging requests are triggered using
* {@link #startRanging(RangingRequest, RangingResultCallback, Handler)}. Results (in case of
* successful operation) are returned in the {@link RangingResultCallback#onRangingResults(List)}
* callback.
*
* @hide RTT_API
*/
@SystemService(Context.WIFI_RTT2_SERVICE)
public class WifiRttManager {
private static final String TAG = "WifiRttManager";
private static final boolean VDBG = true;
private final Context mContext;
private final IWifiRttManager mService;
/** @hide */
public WifiRttManager(Context context, IWifiRttManager service) {
mContext = context;
mService = service;
}
/**
* Initiate a request to range to a set of devices specified in the {@link RangingRequest}.
* Results will be returned in the {@link RangingResultCallback} set of callbacks.
*
* @param request A request specifying a set of devices whose distance measurements are
* requested.
* @param callback A callback for the result of the ranging request.
* @param handler The Handler on whose thread to execute the callbacks of the {@code
* callback} object. If a null is provided then the application's main thread
* will be used.
*/
@RequiresPermission(allOf = {ACCESS_COARSE_LOCATION, CHANGE_WIFI_STATE, ACCESS_WIFI_STATE})
public void startRanging(RangingRequest request, RangingResultCallback callback,
@Nullable Handler handler) {
if (VDBG) {
Log.v(TAG, "startRanging: request=" + request + ", callback=" + callback + ", handler="
+ handler);
}
Looper looper = (handler == null) ? Looper.getMainLooper() : handler.getLooper();
Binder binder = new Binder();
try {
mService.startRanging(binder, mContext.getOpPackageName(), request,
new RttCallbackProxy(looper, callback));
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
private static class RttCallbackProxy extends IRttCallback.Stub {
private final Handler mHandler;
private final RangingResultCallback mCallback;
RttCallbackProxy(Looper looper, RangingResultCallback callback) {
mHandler = new Handler(looper);
mCallback = callback;
}
@Override
public void onRangingResults(int status, List<RangingResult> results) throws RemoteException {
if (VDBG) {
Log.v(TAG, "RttCallbackProxy: onRanginResults: status=" + status + ", results="
+ results);
}
mHandler.post(() -> {
if (status == RangingResultCallback.STATUS_SUCCESS) {
mCallback.onRangingResults(results);
} else {
mCallback.onRangingFailure();
}
});
}
}
}
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