nfc/java/android/nfc/NfcActivityManager.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2011 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 android.nfc;

 import android.app.Activity;
 import android.app.Application;
 import android.compat.annotation.UnsupportedAppUsage;
 import android.nfc.NfcAdapter.ReaderCallback;
 import android.os.Binder;
 import android.os.Bundle;
 import android.os.RemoteException;
 import android.util.Log;

 import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;

 /**
  * Manages NFC API's that are coupled to the life-cycle of an Activity.
  *
  * <p>Uses {@link Application#registerActivityLifecycleCallbacks} to hook
  * into activity life-cycle events such as onPause() and onResume().
  *
  * @hide
  */
 public final class NfcActivityManager extends IAppCallback.Stub
         implements Application.ActivityLifecycleCallbacks {
     static final String TAG = NfcAdapter.TAG;
     static final Boolean DBG = false;

     @UnsupportedAppUsage
     final NfcAdapter mAdapter;

     // All objects in the lists are protected by this
     final List<NfcApplicationState> mApps;  // Application(s) that have NFC state. Usually one
     final List<NfcActivityState> mActivities;  // Activities that have NFC state

     /**
      * NFC State associated with an {@link Application}.
      */
     class NfcApplicationState {
         int refCount = 0;
         final Application app;
         public NfcApplicationState(Application app) {
             this.app = app;
         }
         public void register() {
             refCount++;
             if (refCount == 1) {
                 this.app.registerActivityLifecycleCallbacks(NfcActivityManager.this);
             }
         }
         public void unregister() {
             refCount--;
             if (refCount == 0) {
                 this.app.unregisterActivityLifecycleCallbacks(NfcActivityManager.this);
             } else if (refCount < 0) {
                 Log.e(TAG, "-ve refcount for " + app);
             }
         }
     }

     NfcApplicationState findAppState(Application app) {
         for (NfcApplicationState appState : mApps) {
             if (appState.app == app) {
                 return appState;
             }
         }
         return null;
     }

     void registerApplication(Application app) {
         NfcApplicationState appState = findAppState(app);
         if (appState == null) {
             appState = new NfcApplicationState(app);
             mApps.add(appState);
         }
         appState.register();
     }

     void unregisterApplication(Application app) {
         NfcApplicationState appState = findAppState(app);
         if (appState == null) {
             Log.e(TAG, "app was not registered " + app);
             return;
         }
         appState.unregister();
     }

     /**
      * NFC state associated with an {@link Activity}
      */
     class NfcActivityState {
         boolean resumed = false;
         Activity activity;
         NfcAdapter.ReaderCallback readerCallback = null;
         int readerModeFlags = 0;
         Bundle readerModeExtras = null;
         Binder token;

         int mPollTech = NfcAdapter.FLAG_USE_ALL_TECH;
         int mListenTech = NfcAdapter.FLAG_USE_ALL_TECH;

         public NfcActivityState(Activity activity) {
             if (activity.isDestroyed()) {
                 throw new IllegalStateException("activity is already destroyed");
             }
             // Check if activity is resumed right now, as we will not
             // immediately get a callback for that.
             resumed = activity.isResumed();

             this.activity = activity;
             this.token = new Binder();
             registerApplication(activity.getApplication());
         }
         public void destroy() {
             unregisterApplication(activity.getApplication());
             resumed = false;
             activity = null;
             readerCallback = null;
             readerModeFlags = 0;
             readerModeExtras = null;
             token = null;

             mPollTech = NfcAdapter.FLAG_USE_ALL_TECH;
             mListenTech = NfcAdapter.FLAG_USE_ALL_TECH;
         }
         @Override
         public String toString() {
             StringBuilder s = new StringBuilder("[");
             s.append(readerCallback);
             s.append("]");
             return s.toString();
         }
     }

     /** find activity state from mActivities */
     synchronized NfcActivityState findActivityState(Activity activity) {
         for (NfcActivityState state : mActivities) {
             if (state.activity == activity) {
                 return state;
             }
         }
         return null;
     }

     /** find or create activity state from mActivities */
     synchronized NfcActivityState getActivityState(Activity activity) {
         NfcActivityState state = findActivityState(activity);
         if (state == null) {
             state = new NfcActivityState(activity);
             mActivities.add(state);
         }
         return state;
     }

     synchronized NfcActivityState findResumedActivityState() {
         for (NfcActivityState state : mActivities) {
             if (state.resumed) {
                 return state;
             }
         }
         return null;
     }

     synchronized void destroyActivityState(Activity activity) {
         NfcActivityState activityState = findActivityState(activity);
         if (activityState != null) {
             activityState.destroy();
             mActivities.remove(activityState);
         }
     }

     public NfcActivityManager(NfcAdapter adapter) {
         mAdapter = adapter;
         mActivities = new LinkedList<NfcActivityState>();
         mApps = new ArrayList<NfcApplicationState>(1);  // Android VM usually has 1 app
     }

     public void enableReaderMode(Activity activity, ReaderCallback callback, int flags,
             Bundle extras) {
         boolean isResumed;
         Binder token;
         int pollTech, listenTech;
         synchronized (NfcActivityManager.this) {
             NfcActivityState state = getActivityState(activity);
             state.readerCallback = callback;
             state.readerModeFlags = flags;
             state.readerModeExtras = extras;
             pollTech = state.mPollTech;
             listenTech = state.mListenTech;
             token = state.token;
             isResumed = state.resumed;
         }
         if (isResumed) {
             if (listenTech != NfcAdapter.FLAG_USE_ALL_TECH
                     || pollTech != NfcAdapter.FLAG_USE_ALL_TECH) {
                 throw new IllegalStateException(
                     "Cannot be used when alternative DiscoveryTechnology is set");
             } else {
                 setReaderMode(token, flags, extras);
             }
         }
     }

     public void disableReaderMode(Activity activity) {
         boolean isResumed;
         Binder token;
         synchronized (NfcActivityManager.this) {
             NfcActivityState state = getActivityState(activity);
             state.readerCallback = null;
             state.readerModeFlags = 0;
             state.readerModeExtras = null;
             token = state.token;
             isResumed = state.resumed;
         }
         if (isResumed) {
             setReaderMode(token, 0, null);
         }

     }

     public void setReaderMode(Binder token, int flags, Bundle extras) {
         if (DBG) Log.d(TAG, "Setting reader mode");
         try {
             NfcAdapter.sService.setReaderMode(token, this, flags, extras);
         } catch (RemoteException e) {
             mAdapter.attemptDeadServiceRecovery(e);
         }
     }

     /**
      * Request or unrequest NFC service callbacks.
      * Makes IPC call - do not hold lock.
      */
     void requestNfcServiceCallback() {
         try {
             NfcAdapter.sService.setAppCallback(this);
         } catch (RemoteException e) {
             mAdapter.attemptDeadServiceRecovery(e);
         }
     }

     void verifyNfcPermission() {
         try {
             NfcAdapter.sService.verifyNfcPermission();
         } catch (RemoteException e) {
             mAdapter.attemptDeadServiceRecovery(e);
         }
     }

     @Override
     public void onTagDiscovered(Tag tag) throws RemoteException {
         NfcAdapter.ReaderCallback callback;
         synchronized (NfcActivityManager.this) {
             NfcActivityState state = findResumedActivityState();
             if (state == null) return;

             callback = state.readerCallback;
         }

         // Make callback without lock
         if (callback != null) {
             callback.onTagDiscovered(tag);
         }

     }
     /** Callback from Activity life-cycle, on main thread */
     @Override
     public void onActivityCreated(Activity activity, Bundle savedInstanceState) { /* NO-OP */ }

     /** Callback from Activity life-cycle, on main thread */
     @Override
     public void onActivityStarted(Activity activity) { /* NO-OP */ }

     /** Callback from Activity life-cycle, on main thread */
     @Override
     public void onActivityResumed(Activity activity) {
         int readerModeFlags = 0;
         Bundle readerModeExtras = null;
         Binder token;
         int pollTech;
         int listenTech;

         synchronized (NfcActivityManager.this) {
             NfcActivityState state = findActivityState(activity);
             if (DBG) Log.d(TAG, "onResume() for " + activity + " " + state);
             if (state == null) return;
             state.resumed = true;
             token = state.token;
             readerModeFlags = state.readerModeFlags;
             readerModeExtras = state.readerModeExtras;

             pollTech = state.mPollTech;
             listenTech = state.mListenTech;
         }
         if (readerModeFlags != 0) {
             setReaderMode(token, readerModeFlags, readerModeExtras);
         } else if (listenTech != NfcAdapter.FLAG_USE_ALL_TECH
                 || pollTech != NfcAdapter.FLAG_USE_ALL_TECH) {
             changeDiscoveryTech(token, pollTech, listenTech);
         }
         requestNfcServiceCallback();
     }

     /** Callback from Activity life-cycle, on main thread */
     @Override
     public void onActivityPaused(Activity activity) {
         boolean readerModeFlagsSet;
         Binder token;
         int pollTech;
         int listenTech;

         synchronized (NfcActivityManager.this) {
             NfcActivityState state = findActivityState(activity);
             if (DBG) Log.d(TAG, "onPause() for " + activity + " " + state);
             if (state == null) return;
             state.resumed = false;
             token = state.token;
             readerModeFlagsSet = state.readerModeFlags != 0;

             pollTech = state.mPollTech;
             listenTech = state.mListenTech;
         }
         if (readerModeFlagsSet) {
             // Restore default p2p modes
             setReaderMode(token, 0, null);
         } else if (listenTech != NfcAdapter.FLAG_USE_ALL_TECH
                 || pollTech != NfcAdapter.FLAG_USE_ALL_TECH) {
             changeDiscoveryTech(token,
                     NfcAdapter.FLAG_USE_ALL_TECH, NfcAdapter.FLAG_USE_ALL_TECH);
         }
     }

     /** Callback from Activity life-cycle, on main thread */
     @Override
     public void onActivityStopped(Activity activity) { /* NO-OP */ }

     /** Callback from Activity life-cycle, on main thread */
     @Override
     public void onActivitySaveInstanceState(Activity activity, Bundle outState) { /* NO-OP */ }

     /** Callback from Activity life-cycle, on main thread */
     @Override
     public void onActivityDestroyed(Activity activity) {
         synchronized (NfcActivityManager.this) {
             NfcActivityState state = findActivityState(activity);
             if (DBG) Log.d(TAG, "onDestroy() for " + activity + " " + state);
             if (state != null) {
                 // release all associated references
                 destroyActivityState(activity);
             }
         }
     }

     /** setDiscoveryTechnology() implementation */
     public void setDiscoveryTech(Activity activity, int pollTech, int listenTech) {
         boolean isResumed;
         Binder token;
         boolean readerModeFlagsSet;
         synchronized (NfcActivityManager.this) {
             NfcActivityState state = getActivityState(activity);
             readerModeFlagsSet = state.readerModeFlags != 0;
             state.mListenTech = listenTech;
             state.mPollTech = pollTech;
             token = state.token;
             isResumed = state.resumed;
         }
         if (!readerModeFlagsSet && isResumed) {
             changeDiscoveryTech(token, pollTech, listenTech);
         } else if (readerModeFlagsSet) {
             throw new IllegalStateException("Cannot be used when the Reader Mode is enabled");
         }
     }

     /** resetDiscoveryTechnology() implementation */
     public void resetDiscoveryTech(Activity activity) {
         boolean isResumed;
         Binder token;
         boolean readerModeFlagsSet;
         synchronized (NfcActivityManager.this) {
             NfcActivityState state = getActivityState(activity);
             state.mListenTech = NfcAdapter.FLAG_USE_ALL_TECH;
             state.mPollTech = NfcAdapter.FLAG_USE_ALL_TECH;
             token = state.token;
             isResumed = state.resumed;
         }
         if (isResumed) {
             changeDiscoveryTech(token, NfcAdapter.FLAG_USE_ALL_TECH, NfcAdapter.FLAG_USE_ALL_TECH);
         }

     }

     private void changeDiscoveryTech(Binder token, int pollTech, int listenTech) {
         try {
             NfcAdapter.sService.updateDiscoveryTechnology(token, pollTech, listenTech);
         } catch (RemoteException e) {
             mAdapter.attemptDeadServiceRecovery(e);
         }
     }

 }
	/*
	* Copyright (C) 2011 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 android.nfc;

	import android.app.Activity;
	import android.app.Application;
	import android.compat.annotation.UnsupportedAppUsage;
	import android.nfc.NfcAdapter.ReaderCallback;
	import android.os.Binder;
	import android.os.Bundle;
	import android.os.RemoteException;
	import android.util.Log;

	import java.util.ArrayList;
	import java.util.LinkedList;
	import java.util.List;

	/**
	* Manages NFC API's that are coupled to the life-cycle of an Activity.
	*
	* <p>Uses {@link Application#registerActivityLifecycleCallbacks} to hook
	* into activity life-cycle events such as onPause() and onResume().
	*
	* @hide
	*/
	public final class NfcActivityManager extends IAppCallback.Stub
	implements Application.ActivityLifecycleCallbacks {
	static final String TAG = NfcAdapter.TAG;
	static final Boolean DBG = false;

	@UnsupportedAppUsage
	final NfcAdapter mAdapter;

	// All objects in the lists are protected by this
	final List<NfcApplicationState> mApps; // Application(s) that have NFC state. Usually one
	final List<NfcActivityState> mActivities; // Activities that have NFC state

	/**
	* NFC State associated with an {@link Application}.
	*/
	class NfcApplicationState {
	int refCount = 0;
	final Application app;
	public NfcApplicationState(Application app) {
	this.app = app;
	}
	public void register() {
	refCount++;
	if (refCount == 1) {
	this.app.registerActivityLifecycleCallbacks(NfcActivityManager.this);
	}
	}
	public void unregister() {
	refCount--;
	if (refCount == 0) {
	this.app.unregisterActivityLifecycleCallbacks(NfcActivityManager.this);
	} else if (refCount < 0) {
	Log.e(TAG, "-ve refcount for " + app);
	}
	}
	}

	NfcApplicationState findAppState(Application app) {
	for (NfcApplicationState appState : mApps) {
	if (appState.app == app) {
	return appState;
	}
	}
	return null;
	}

	void registerApplication(Application app) {
	NfcApplicationState appState = findAppState(app);
	if (appState == null) {
	appState = new NfcApplicationState(app);
	mApps.add(appState);
	}
	appState.register();
	}

	void unregisterApplication(Application app) {
	NfcApplicationState appState = findAppState(app);
	if (appState == null) {
	Log.e(TAG, "app was not registered " + app);
	return;
	}
	appState.unregister();
	}

	/**
	* NFC state associated with an {@link Activity}
	*/
	class NfcActivityState {
	boolean resumed = false;
	Activity activity;
	NfcAdapter.ReaderCallback readerCallback = null;
	int readerModeFlags = 0;
	Bundle readerModeExtras = null;
	Binder token;

	int mPollTech = NfcAdapter.FLAG_USE_ALL_TECH;
	int mListenTech = NfcAdapter.FLAG_USE_ALL_TECH;

	public NfcActivityState(Activity activity) {
	if (activity.isDestroyed()) {
	throw new IllegalStateException("activity is already destroyed");
	}
	// Check if activity is resumed right now, as we will not
	// immediately get a callback for that.
	resumed = activity.isResumed();

	this.activity = activity;
	this.token = new Binder();
	registerApplication(activity.getApplication());
	}
	public void destroy() {
	unregisterApplication(activity.getApplication());
	resumed = false;
	activity = null;
	readerCallback = null;
	readerModeFlags = 0;
	readerModeExtras = null;
	token = null;

	mPollTech = NfcAdapter.FLAG_USE_ALL_TECH;
	mListenTech = NfcAdapter.FLAG_USE_ALL_TECH;
	}
	@Override
	public String toString() {
	StringBuilder s = new StringBuilder("[");
	s.append(readerCallback);
	s.append("]");
	return s.toString();
	}
	}

	/** find activity state from mActivities */
	synchronized NfcActivityState findActivityState(Activity activity) {
	for (NfcActivityState state : mActivities) {
	if (state.activity == activity) {
	return state;
	}
	}
	return null;
	}

	/** find or create activity state from mActivities */
	synchronized NfcActivityState getActivityState(Activity activity) {
	NfcActivityState state = findActivityState(activity);
	if (state == null) {
	state = new NfcActivityState(activity);
	mActivities.add(state);
	}
	return state;
	}

	synchronized NfcActivityState findResumedActivityState() {
	for (NfcActivityState state : mActivities) {
	if (state.resumed) {
	return state;
	}
	}
	return null;
	}

	synchronized void destroyActivityState(Activity activity) {
	NfcActivityState activityState = findActivityState(activity);
	if (activityState != null) {
	activityState.destroy();
	mActivities.remove(activityState);
	}
	}

	public NfcActivityManager(NfcAdapter adapter) {
	mAdapter = adapter;
	mActivities = new LinkedList<NfcActivityState>();
	mApps = new ArrayList<NfcApplicationState>(1); // Android VM usually has 1 app
	}

	public void enableReaderMode(Activity activity, ReaderCallback callback, int flags,
	Bundle extras) {
	boolean isResumed;
	Binder token;
	int pollTech, listenTech;
	synchronized (NfcActivityManager.this) {
	NfcActivityState state = getActivityState(activity);
	state.readerCallback = callback;
	state.readerModeFlags = flags;
	state.readerModeExtras = extras;
	pollTech = state.mPollTech;
	listenTech = state.mListenTech;
	token = state.token;
	isResumed = state.resumed;
	}
	if (isResumed) {
	if (listenTech != NfcAdapter.FLAG_USE_ALL_TECH
	\|\| pollTech != NfcAdapter.FLAG_USE_ALL_TECH) {
	throw new IllegalStateException(
	"Cannot be used when alternative DiscoveryTechnology is set");
	} else {
	setReaderMode(token, flags, extras);
	}
	}
	}

	public void disableReaderMode(Activity activity) {
	boolean isResumed;
	Binder token;
	synchronized (NfcActivityManager.this) {
	NfcActivityState state = getActivityState(activity);
	state.readerCallback = null;
	state.readerModeFlags = 0;
	state.readerModeExtras = null;
	token = state.token;
	isResumed = state.resumed;
	}
	if (isResumed) {
	setReaderMode(token, 0, null);
	}

	}

	public void setReaderMode(Binder token, int flags, Bundle extras) {
	if (DBG) Log.d(TAG, "Setting reader mode");
	try {
	NfcAdapter.sService.setReaderMode(token, this, flags, extras);
	} catch (RemoteException e) {
	mAdapter.attemptDeadServiceRecovery(e);
	}
	}

	/**
	* Request or unrequest NFC service callbacks.
	* Makes IPC call - do not hold lock.
	*/
	void requestNfcServiceCallback() {
	try {
	NfcAdapter.sService.setAppCallback(this);
	} catch (RemoteException e) {
	mAdapter.attemptDeadServiceRecovery(e);
	}
	}

	void verifyNfcPermission() {
	try {
	NfcAdapter.sService.verifyNfcPermission();
	} catch (RemoteException e) {
	mAdapter.attemptDeadServiceRecovery(e);
	}
	}

	@Override
	public void onTagDiscovered(Tag tag) throws RemoteException {
	NfcAdapter.ReaderCallback callback;
	synchronized (NfcActivityManager.this) {
	NfcActivityState state = findResumedActivityState();
	if (state == null) return;

	callback = state.readerCallback;
	}

	// Make callback without lock
	if (callback != null) {
	callback.onTagDiscovered(tag);
	}

	}
	/** Callback from Activity life-cycle, on main thread */
	@Override
	public void onActivityCreated(Activity activity, Bundle savedInstanceState) { /* NO-OP */ }

	/** Callback from Activity life-cycle, on main thread */
	@Override
	public void onActivityStarted(Activity activity) { /* NO-OP */ }

	/** Callback from Activity life-cycle, on main thread */
	@Override
	public void onActivityResumed(Activity activity) {
	int readerModeFlags = 0;
	Bundle readerModeExtras = null;
	Binder token;
	int pollTech;
	int listenTech;

	synchronized (NfcActivityManager.this) {
	NfcActivityState state = findActivityState(activity);
	if (DBG) Log.d(TAG, "onResume() for " + activity + " " + state);
	if (state == null) return;
	state.resumed = true;
	token = state.token;
	readerModeFlags = state.readerModeFlags;
	readerModeExtras = state.readerModeExtras;

	pollTech = state.mPollTech;
	listenTech = state.mListenTech;
	}
	if (readerModeFlags != 0) {
	setReaderMode(token, readerModeFlags, readerModeExtras);
	} else if (listenTech != NfcAdapter.FLAG_USE_ALL_TECH
	\|\| pollTech != NfcAdapter.FLAG_USE_ALL_TECH) {
	changeDiscoveryTech(token, pollTech, listenTech);
	}
	requestNfcServiceCallback();
	}

	/** Callback from Activity life-cycle, on main thread */
	@Override
	public void onActivityPaused(Activity activity) {
	boolean readerModeFlagsSet;
	Binder token;
	int pollTech;
	int listenTech;

	synchronized (NfcActivityManager.this) {
	NfcActivityState state = findActivityState(activity);
	if (DBG) Log.d(TAG, "onPause() for " + activity + " " + state);
	if (state == null) return;
	state.resumed = false;
	token = state.token;
	readerModeFlagsSet = state.readerModeFlags != 0;

	pollTech = state.mPollTech;
	listenTech = state.mListenTech;
	}
	if (readerModeFlagsSet) {
	// Restore default p2p modes
	setReaderMode(token, 0, null);
	} else if (listenTech != NfcAdapter.FLAG_USE_ALL_TECH
	\|\| pollTech != NfcAdapter.FLAG_USE_ALL_TECH) {
	changeDiscoveryTech(token,
	NfcAdapter.FLAG_USE_ALL_TECH, NfcAdapter.FLAG_USE_ALL_TECH);
	}
	}

	/** Callback from Activity life-cycle, on main thread */
	@Override
	public void onActivityStopped(Activity activity) { /* NO-OP */ }

	/** Callback from Activity life-cycle, on main thread */
	@Override
	public void onActivitySaveInstanceState(Activity activity, Bundle outState) { /* NO-OP */ }

	/** Callback from Activity life-cycle, on main thread */
	@Override
	public void onActivityDestroyed(Activity activity) {
	synchronized (NfcActivityManager.this) {
	NfcActivityState state = findActivityState(activity);
	if (DBG) Log.d(TAG, "onDestroy() for " + activity + " " + state);
	if (state != null) {
	// release all associated references
	destroyActivityState(activity);
	}
	}
	}

	/** setDiscoveryTechnology() implementation */
	public void setDiscoveryTech(Activity activity, int pollTech, int listenTech) {
	boolean isResumed;
	Binder token;
	boolean readerModeFlagsSet;
	synchronized (NfcActivityManager.this) {
	NfcActivityState state = getActivityState(activity);
	readerModeFlagsSet = state.readerModeFlags != 0;
	state.mListenTech = listenTech;
	state.mPollTech = pollTech;
	token = state.token;
	isResumed = state.resumed;
	}
	if (!readerModeFlagsSet && isResumed) {
	changeDiscoveryTech(token, pollTech, listenTech);
	} else if (readerModeFlagsSet) {
	throw new IllegalStateException("Cannot be used when the Reader Mode is enabled");
	}
	}

	/** resetDiscoveryTechnology() implementation */
	public void resetDiscoveryTech(Activity activity) {
	boolean isResumed;
	Binder token;
	boolean readerModeFlagsSet;
	synchronized (NfcActivityManager.this) {
	NfcActivityState state = getActivityState(activity);
	state.mListenTech = NfcAdapter.FLAG_USE_ALL_TECH;
	state.mPollTech = NfcAdapter.FLAG_USE_ALL_TECH;
	token = state.token;
	isResumed = state.resumed;
	}
	if (isResumed) {
	changeDiscoveryTech(token, NfcAdapter.FLAG_USE_ALL_TECH, NfcAdapter.FLAG_USE_ALL_TECH);
	}

	}

	private void changeDiscoveryTech(Binder token, int pollTech, int listenTech) {
	try {
	NfcAdapter.sService.updateDiscoveryTechnology(token, pollTech, listenTech);
	} catch (RemoteException e) {
	mAdapter.attemptDeadServiceRecovery(e);
	}
	}

	}