/*
* 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.content.ContentProvider;
import android.content.Intent;
import android.net.Uri;
import android.nfc.NfcAdapter.ReaderCallback;
import android.os.Binder;
import android.os.Bundle;
import android.os.RemoteException;
import android.os.UserHandle;
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;
final NfcAdapter mAdapter;
final NfcEvent mDefaultEvent; // cached NfcEvent (its currently always the same)
// 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;
NdefMessage ndefMessage = null; // static NDEF message
NfcAdapter.CreateNdefMessageCallback ndefMessageCallback = null;
NfcAdapter.OnNdefPushCompleteCallback onNdefPushCompleteCallback = null;
NfcAdapter.CreateBeamUrisCallback uriCallback = null;
Uri[] uris = null;
int flags = 0;
int readerModeFlags = 0;
NfcAdapter.ReaderCallback readerCallback = null;
Bundle readerModeExtras = null;
Binder token;
public NfcActivityState(Activity activity) {
if (activity.getWindow().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;
ndefMessage = null;
ndefMessageCallback = null;
onNdefPushCompleteCallback = null;
uriCallback = null;
uris = null;
readerModeFlags = 0;
token = null;
}
@Override
public String toString() {
StringBuilder s = new StringBuilder("[").append(" ");
s.append(ndefMessage).append(" ").append(ndefMessageCallback).append(" ");
s.append(uriCallback).append(" ");
if (uris != null) {
for (Uri uri : uris) {
s.append(onNdefPushCompleteCallback).append(" ").append(uri).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
mDefaultEvent = new NfcEvent(mAdapter);
}
public void enableReaderMode(Activity activity, ReaderCallback callback, int flags,
Bundle extras) {
boolean isResumed;
Binder token;
synchronized (NfcActivityManager.this) {
NfcActivityState state = getActivityState(activity);
state.readerCallback = callback;
state.readerModeFlags = flags;
state.readerModeExtras = extras;
token = state.token;
isResumed = state.resumed;
}
if (isResumed) {
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);
}
}
public void setNdefPushContentUri(Activity activity, Uri[] uris) {
boolean isResumed;
synchronized (NfcActivityManager.this) {
NfcActivityState state = getActivityState(activity);
state.uris = uris;
isResumed = state.resumed;
}
if (isResumed) {
// requestNfcServiceCallback() verifies permission also
requestNfcServiceCallback();
} else {
// Crash API calls early in case NFC permission is missing
verifyNfcPermission();
}
}
public void setNdefPushContentUriCallback(Activity activity,
NfcAdapter.CreateBeamUrisCallback callback) {
boolean isResumed;
synchronized (NfcActivityManager.this) {
NfcActivityState state = getActivityState(activity);
state.uriCallback = callback;
isResumed = state.resumed;
}
if (isResumed) {
// requestNfcServiceCallback() verifies permission also
requestNfcServiceCallback();
} else {
// Crash API calls early in case NFC permission is missing
verifyNfcPermission();
}
}
public void setNdefPushMessage(Activity activity, NdefMessage message, int flags) {
boolean isResumed;
synchronized (NfcActivityManager.this) {
NfcActivityState state = getActivityState(activity);
state.ndefMessage = message;
state.flags = flags;
isResumed = state.resumed;
}
if (isResumed) {
// requestNfcServiceCallback() verifies permission also
requestNfcServiceCallback();
} else {
// Crash API calls early in case NFC permission is missing
verifyNfcPermission();
}
}
public void setNdefPushMessageCallback(Activity activity,
NfcAdapter.CreateNdefMessageCallback callback, int flags) {
boolean isResumed;
synchronized (NfcActivityManager.this) {
NfcActivityState state = getActivityState(activity);
state.ndefMessageCallback = callback;
state.flags = flags;
isResumed = state.resumed;
}
if (isResumed) {
// requestNfcServiceCallback() verifies permission also
requestNfcServiceCallback();
} else {
// Crash API calls early in case NFC permission is missing
verifyNfcPermission();
}
}
public void setOnNdefPushCompleteCallback(Activity activity,
NfcAdapter.OnNdefPushCompleteCallback callback) {
boolean isResumed;
synchronized (NfcActivityManager.this) {
NfcActivityState state = getActivityState(activity);
state.onNdefPushCompleteCallback = callback;
isResumed = state.resumed;
}
if (isResumed) {
// requestNfcServiceCallback() verifies permission also
requestNfcServiceCallback();
} else {
// Crash API calls early in case NFC permission is missing
verifyNfcPermission();
}
}
/**
* 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);
}
}
/** Callback from NFC service, usually on binder thread */
@Override
public BeamShareData createBeamShareData() {
NfcAdapter.CreateNdefMessageCallback ndefCallback;
NfcAdapter.CreateBeamUrisCallback urisCallback;
NdefMessage message;
Activity activity;
Uri[] uris;
int flags;
synchronized (NfcActivityManager.this) {
NfcActivityState state = findResumedActivityState();
if (state == null) return null;
ndefCallback = state.ndefMessageCallback;
urisCallback = state.uriCallback;
message = state.ndefMessage;
uris = state.uris;
flags = state.flags;
activity = state.activity;
}
// Make callbacks without lock
if (ndefCallback != null) {
message = ndefCallback.createNdefMessage(mDefaultEvent);
}
if (urisCallback != null) {
uris = urisCallback.createBeamUris(mDefaultEvent);
if (uris != null) {
ArrayList<Uri> validUris = new ArrayList<Uri>();
for (Uri uri : uris) {
if (uri == null) {
Log.e(TAG, "Uri not allowed to be null.");
continue;
}
String scheme = uri.getScheme();
if (scheme == null || (!scheme.equalsIgnoreCase("file") &&
!scheme.equalsIgnoreCase("content"))) {
Log.e(TAG, "Uri needs to have " +
"either scheme file or scheme content");
continue;
}
uri = ContentProvider.maybeAddUserId(uri, UserHandle.myUserId());
validUris.add(uri);
}
uris = validUris.toArray(new Uri[validUris.size()]);
}
}
if (uris != null && uris.length > 0) {
for (Uri uri : uris) {
// Grant the NFC process permission to read these URIs
activity.grantUriPermission("com.android.nfc", uri,
Intent.FLAG_GRANT_READ_URI_PERMISSION);
}
}
return new BeamShareData(message, uris, UserHandle.CURRENT, flags);
}
/** Callback from NFC service, usually on binder thread */
@Override
public void onNdefPushComplete() {
NfcAdapter.OnNdefPushCompleteCallback callback;
synchronized (NfcActivityManager.this) {
NfcActivityState state = findResumedActivityState();
if (state == null) return;
callback = state.onNdefPushCompleteCallback;
}
// Make callback without lock
if (callback != null) {
callback.onNdefPushComplete(mDefaultEvent);
}
}
@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;
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;
}
if (readerModeFlags != 0) {
setReaderMode(token, readerModeFlags, readerModeExtras);
}
requestNfcServiceCallback();
}
/** Callback from Activity life-cycle, on main thread */
@Override
public void onActivityPaused(Activity activity) {
boolean readerModeFlagsSet;
Binder token;
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;
}
if (readerModeFlagsSet) {
// Restore default p2p modes
setReaderMode(token, 0, null);
}
}
/** 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);
}
}
}
}
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