| /* |
| * Copyright (C) 2017 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.companion; |
| |
| |
| import static com.android.internal.util.Preconditions.checkNotNull; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.annotation.SystemService; |
| import android.app.Activity; |
| import android.app.Application; |
| import android.app.PendingIntent; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.IntentSender; |
| import android.content.pm.PackageManager; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.RemoteException; |
| import android.service.notification.NotificationListenerService; |
| import android.util.Log; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.function.BiConsumer; |
| |
| /** |
| * System level service for managing companion devices |
| * |
| * <p>To obtain an instance call {@link Context#getSystemService}({@link |
| * Context#COMPANION_DEVICE_SERVICE}) Then, call {@link #associate(AssociationRequest, |
| * Callback, Handler)} to initiate the flow of associating current package with a |
| * device selected by user.</p> |
| * |
| * @see AssociationRequest |
| */ |
| @SystemService(Context.COMPANION_DEVICE_SERVICE) |
| public final class CompanionDeviceManager { |
| |
| private static final boolean DEBUG = false; |
| private static final String LOG_TAG = "CompanionDeviceManager"; |
| |
| /** |
| * A device, returned in the activity result of the {@link IntentSender} received in |
| * {@link Callback#onDeviceFound} |
| */ |
| public static final String EXTRA_DEVICE = "android.companion.extra.DEVICE"; |
| |
| /** |
| * The package name of the companion device discovery component. |
| * |
| * @hide |
| */ |
| public static final String COMPANION_DEVICE_DISCOVERY_PACKAGE_NAME = |
| "com.android.companiondevicemanager"; |
| |
| /** |
| * A callback to receive once at least one suitable device is found, or the search failed |
| * (e.g. timed out) |
| */ |
| public abstract static class Callback { |
| |
| /** |
| * Called once at least one suitable device is found |
| * |
| * @param chooserLauncher a {@link IntentSender} to launch the UI for user to select a |
| * device |
| */ |
| public abstract void onDeviceFound(IntentSender chooserLauncher); |
| |
| /** |
| * Called if there was an error looking for device(s) |
| * |
| * @param error the cause of the error |
| */ |
| public abstract void onFailure(CharSequence error); |
| } |
| |
| private final ICompanionDeviceManager mService; |
| private final Context mContext; |
| |
| /** @hide */ |
| public CompanionDeviceManager( |
| @Nullable ICompanionDeviceManager service, @NonNull Context context) { |
| mService = service; |
| mContext = context; |
| } |
| |
| /** |
| * Associate this app with a companion device, selected by user |
| * |
| * <p>Once at least one appropriate device is found, {@code callback} will be called with a |
| * {@link PendingIntent} that can be used to show the list of available devices for the user |
| * to select. |
| * It should be started for result (i.e. using |
| * {@link android.app.Activity#startIntentSenderForResult}), as the resulting |
| * {@link android.content.Intent} will contain extra {@link #EXTRA_DEVICE}, with the selected |
| * device. (e.g. {@link android.bluetooth.BluetoothDevice})</p> |
| * |
| * <p>If your app needs to be excluded from battery optimizations (run in the background) |
| * or to have unrestricted data access (use data in the background) you can declare that |
| * you use the {@link android.Manifest.permission#REQUEST_COMPANION_RUN_IN_BACKGROUND} and {@link |
| * android.Manifest.permission#REQUEST_COMPANION_USE_DATA_IN_BACKGROUND} respectively. Note that these |
| * special capabilities have a negative effect on the device's battery and user's data |
| * usage, therefore you should requested them when absolutely necessary.</p> |
| * |
| * <p>You can call {@link #getAssociations} to get the list of currently associated |
| * devices, and {@link #disassociate} to remove an association. Consider doing so when the |
| * association is no longer relevant to avoid unnecessary battery and/or data drain resulting |
| * from special privileges that the association provides</p> |
| * |
| * <p>Calling this API requires a uses-feature |
| * {@link PackageManager#FEATURE_COMPANION_DEVICE_SETUP} declaration in the manifest</p> |
| * |
| * @param request specific details about this request |
| * @param callback will be called once there's at least one device found for user to choose from |
| * @param handler A handler to control which thread the callback will be delivered on, or null, |
| * to deliver it on main thread |
| * |
| * @see AssociationRequest |
| */ |
| public void associate( |
| @NonNull AssociationRequest request, |
| @NonNull Callback callback, |
| @Nullable Handler handler) { |
| if (!checkFeaturePresent()) { |
| return; |
| } |
| checkNotNull(request, "Request cannot be null"); |
| checkNotNull(callback, "Callback cannot be null"); |
| try { |
| mService.associate( |
| request, |
| new CallbackProxy(request, callback, Handler.mainIfNull(handler)), |
| getCallingPackage()); |
| } catch (RemoteException e) { |
| throw e.rethrowFromSystemServer(); |
| } |
| } |
| |
| /** |
| * <p>Calling this API requires a uses-feature |
| * {@link PackageManager#FEATURE_COMPANION_DEVICE_SETUP} declaration in the manifest</p> |
| * |
| * @return a list of MAC addresses of devices that have been previously associated with the |
| * current app. You can use these with {@link #disassociate} |
| */ |
| @NonNull |
| public List<String> getAssociations() { |
| if (!checkFeaturePresent()) { |
| return Collections.emptyList(); |
| } |
| try { |
| return mService.getAssociations(getCallingPackage(), mContext.getUserId()); |
| } catch (RemoteException e) { |
| throw e.rethrowFromSystemServer(); |
| } |
| } |
| |
| /** |
| * Remove the association between this app and the device with the given mac address. |
| * |
| * <p>Any privileges provided via being associated with a given device will be revoked</p> |
| * |
| * <p>Consider doing so when the |
| * association is no longer relevant to avoid unnecessary battery and/or data drain resulting |
| * from special privileges that the association provides</p> |
| * |
| * <p>Calling this API requires a uses-feature |
| * {@link PackageManager#FEATURE_COMPANION_DEVICE_SETUP} declaration in the manifest</p> |
| * |
| * @param deviceMacAddress the MAC address of device to disassociate from this app |
| */ |
| public void disassociate(@NonNull String deviceMacAddress) { |
| if (!checkFeaturePresent()) { |
| return; |
| } |
| try { |
| mService.disassociate(deviceMacAddress, getCallingPackage()); |
| } catch (RemoteException e) { |
| throw e.rethrowFromSystemServer(); |
| } |
| } |
| |
| /** |
| * Request notification access for the given component. |
| * |
| * The given component must follow the protocol specified in {@link NotificationListenerService} |
| * |
| * Only components from the same {@link ComponentName#getPackageName package} as the calling app |
| * are allowed. |
| * |
| * Your app must have an association with a device before calling this API |
| * |
| * <p>Calling this API requires a uses-feature |
| * {@link PackageManager#FEATURE_COMPANION_DEVICE_SETUP} declaration in the manifest</p> |
| */ |
| public void requestNotificationAccess(ComponentName component) { |
| if (!checkFeaturePresent()) { |
| return; |
| } |
| try { |
| IntentSender intentSender = mService.requestNotificationAccess(component) |
| .getIntentSender(); |
| mContext.startIntentSender(intentSender, null, 0, 0, 0); |
| } catch (RemoteException e) { |
| throw e.rethrowFromSystemServer(); |
| } catch (IntentSender.SendIntentException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| /** |
| * Check whether the given component can access the notifications via a |
| * {@link NotificationListenerService} |
| * |
| * Your app must have an association with a device before calling this API |
| * |
| * <p>Calling this API requires a uses-feature |
| * {@link PackageManager#FEATURE_COMPANION_DEVICE_SETUP} declaration in the manifest</p> |
| * |
| * @param component the name of the component |
| * @return whether the given component has the notification listener permission |
| */ |
| public boolean hasNotificationAccess(ComponentName component) { |
| if (!checkFeaturePresent()) { |
| return false; |
| } |
| try { |
| return mService.hasNotificationAccess(component); |
| } catch (RemoteException e) { |
| throw e.rethrowFromSystemServer(); |
| } |
| } |
| |
| private boolean checkFeaturePresent() { |
| boolean featurePresent = mService != null; |
| if (!featurePresent && DEBUG) { |
| Log.d(LOG_TAG, "Feature " + PackageManager.FEATURE_COMPANION_DEVICE_SETUP |
| + " not available"); |
| } |
| return featurePresent; |
| } |
| |
| private Activity getActivity() { |
| return (Activity) mContext; |
| } |
| |
| private String getCallingPackage() { |
| return mContext.getPackageName(); |
| } |
| |
| private class CallbackProxy extends IFindDeviceCallback.Stub |
| implements Application.ActivityLifecycleCallbacks { |
| |
| private Callback mCallback; |
| private Handler mHandler; |
| private AssociationRequest mRequest; |
| |
| final Object mLock = new Object(); |
| |
| private CallbackProxy(AssociationRequest request, Callback callback, Handler handler) { |
| mCallback = callback; |
| mHandler = handler; |
| mRequest = request; |
| getActivity().getApplication().registerActivityLifecycleCallbacks(this); |
| } |
| |
| @Override |
| public void onSuccess(PendingIntent launcher) { |
| lockAndPost(Callback::onDeviceFound, launcher.getIntentSender()); |
| } |
| |
| @Override |
| public void onFailure(CharSequence reason) { |
| lockAndPost(Callback::onFailure, reason); |
| } |
| |
| <T> void lockAndPost(BiConsumer<Callback, T> action, T payload) { |
| synchronized (mLock) { |
| if (mHandler != null) { |
| mHandler.post(() -> { |
| Callback callback = null; |
| synchronized (mLock) { |
| callback = mCallback; |
| } |
| if (callback != null) { |
| action.accept(callback, payload); |
| } |
| }); |
| } |
| } |
| } |
| |
| @Override |
| public void onActivityDestroyed(Activity activity) { |
| synchronized (mLock) { |
| if (activity != getActivity()) return; |
| try { |
| mService.stopScan(mRequest, this, getCallingPackage()); |
| } catch (RemoteException e) { |
| e.rethrowFromSystemServer(); |
| } |
| getActivity().getApplication().unregisterActivityLifecycleCallbacks(this); |
| mCallback = null; |
| mHandler = null; |
| mRequest = null; |
| } |
| } |
| |
| @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) {} |
| @Override public void onActivityStarted(Activity activity) {} |
| @Override public void onActivityResumed(Activity activity) {} |
| @Override public void onActivityPaused(Activity activity) {} |
| @Override public void onActivityStopped(Activity activity) {} |
| @Override public void onActivitySaveInstanceState(Activity activity, Bundle outState) {} |
| } |
| } |