| /* |
| * 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 com.android.server.accessibility; |
| |
| import android.accessibilityservice.FingerprintGestureController; |
| import android.content.res.Resources; |
| import android.hardware.fingerprint.IFingerprintClientActiveCallback; |
| import android.hardware.fingerprint.IFingerprintService; |
| import android.os.Binder; |
| import android.os.Handler; |
| import android.os.Message; |
| import android.os.RemoteException; |
| import android.util.Slog; |
| import android.view.KeyEvent; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Encapsulate fingerprint gesture logic |
| */ |
| public class FingerprintGestureDispatcher extends IFingerprintClientActiveCallback.Stub |
| implements Handler.Callback{ |
| private static final int MSG_REGISTER = 1; |
| private static final int MSG_UNREGISTER = 2; |
| private static final String LOG_TAG = "FingerprintGestureDispatcher"; |
| |
| private final List<FingerprintGestureClient> mCapturingClients = new ArrayList<>(0); |
| private final Object mLock; |
| private final IFingerprintService mFingerprintService; |
| private final Handler mHandler; |
| private final boolean mHardwareSupportsGestures; |
| |
| // This field is ground truth for whether or not we are registered. Only write to it in handler. |
| private boolean mRegisteredReadOnlyExceptInHandler; |
| |
| /** |
| * @param fingerprintService The system's fingerprint service |
| * @param lock A lock to use when managing internal state |
| */ |
| public FingerprintGestureDispatcher(IFingerprintService fingerprintService, |
| Resources resources, Object lock) { |
| mFingerprintService = fingerprintService; |
| mHardwareSupportsGestures = resources.getBoolean( |
| com.android.internal.R.bool.config_fingerprintSupportsGestures); |
| mLock = lock; |
| mHandler = new Handler(this); |
| } |
| |
| /** |
| * @param fingerprintService The system's fingerprint service |
| * @param lock A lock to use when managing internal state |
| * @param handler A handler to use internally. Used for testing. |
| */ |
| public FingerprintGestureDispatcher(IFingerprintService fingerprintService, |
| Resources resources, Object lock, Handler handler) { |
| mFingerprintService = fingerprintService; |
| mHardwareSupportsGestures = resources.getBoolean( |
| com.android.internal.R.bool.config_fingerprintSupportsGestures); |
| mLock = lock; |
| mHandler = handler; |
| } |
| |
| /** |
| * Update the list of clients that are interested in fingerprint gestures. |
| * |
| * @param clientList The list of potential clients. |
| */ |
| public void updateClientList(List<? extends FingerprintGestureClient> clientList) { |
| if (!mHardwareSupportsGestures) return; |
| |
| synchronized (mLock) { |
| mCapturingClients.clear(); |
| for (int i = 0; i < clientList.size(); i++) { |
| FingerprintGestureClient client = clientList.get(i); |
| if (client.isCapturingFingerprintGestures()) { |
| mCapturingClients.add(client); |
| } |
| } |
| if (mCapturingClients.isEmpty()) { |
| if (mRegisteredReadOnlyExceptInHandler) { |
| mHandler.obtainMessage(MSG_UNREGISTER).sendToTarget(); |
| } |
| } else { |
| if(!mRegisteredReadOnlyExceptInHandler) { |
| mHandler.obtainMessage(MSG_REGISTER).sendToTarget(); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public void onClientActiveChanged(boolean nonGestureFingerprintClientActive) { |
| if (!mHardwareSupportsGestures) return; |
| |
| synchronized (mLock) { |
| for (int i = 0; i < mCapturingClients.size(); i++) { |
| mCapturingClients.get(i).onFingerprintGestureDetectionActiveChanged( |
| !nonGestureFingerprintClientActive); |
| } |
| } |
| } |
| |
| public boolean isFingerprintGestureDetectionAvailable() { |
| if (!mHardwareSupportsGestures) return false; |
| |
| final long identity = Binder.clearCallingIdentity(); |
| try { |
| return !mFingerprintService.isClientActive(); |
| } catch (RemoteException re) { |
| return false; |
| } finally { |
| Binder.restoreCallingIdentity(identity); |
| } |
| } |
| |
| /** |
| * Called when the fingerprint sensor detects a gesture |
| * |
| * @param fingerprintKeyCode |
| * @return {@code true} if the gesture is consumed. {@code false} otherwise. |
| */ |
| public boolean onFingerprintGesture(int fingerprintKeyCode) { |
| int idForFingerprintGestureManager; |
| |
| final List<FingerprintGestureClient> clientList; |
| synchronized (mLock) { |
| if (mCapturingClients.isEmpty()) { |
| return false; |
| } |
| switch (fingerprintKeyCode) { |
| case KeyEvent.KEYCODE_SYSTEM_NAVIGATION_UP: |
| idForFingerprintGestureManager = |
| FingerprintGestureController.FINGERPRINT_GESTURE_SWIPE_UP; |
| break; |
| case KeyEvent.KEYCODE_SYSTEM_NAVIGATION_DOWN: |
| idForFingerprintGestureManager = |
| FingerprintGestureController.FINGERPRINT_GESTURE_SWIPE_DOWN; |
| break; |
| case KeyEvent.KEYCODE_SYSTEM_NAVIGATION_RIGHT: |
| idForFingerprintGestureManager = |
| FingerprintGestureController.FINGERPRINT_GESTURE_SWIPE_RIGHT; |
| break; |
| case KeyEvent.KEYCODE_SYSTEM_NAVIGATION_LEFT: |
| idForFingerprintGestureManager = |
| FingerprintGestureController.FINGERPRINT_GESTURE_SWIPE_LEFT; |
| break; |
| default: |
| return false; |
| } |
| clientList = new ArrayList<>(mCapturingClients); |
| } |
| for (int i = 0; i < clientList.size(); i++) { |
| clientList.get(i).onFingerprintGesture(idForFingerprintGestureManager); |
| } |
| return true; |
| } |
| |
| @Override |
| public boolean handleMessage(Message message) { |
| if (message.what == MSG_REGISTER) { |
| final long identity = Binder.clearCallingIdentity(); |
| try { |
| mFingerprintService.addClientActiveCallback(this); |
| mRegisteredReadOnlyExceptInHandler = true; |
| } catch (RemoteException re) { |
| Slog.e(LOG_TAG, "Failed to register for fingerprint activity callbacks"); |
| } finally { |
| Binder.restoreCallingIdentity(identity); |
| } |
| return false; |
| } else if (message.what == MSG_UNREGISTER) { |
| final long identity = Binder.clearCallingIdentity(); |
| try { |
| mFingerprintService.removeClientActiveCallback(this); |
| } catch (RemoteException re) { |
| Slog.e(LOG_TAG, "Failed to unregister for fingerprint activity callbacks"); |
| } finally { |
| Binder.restoreCallingIdentity(identity); |
| } |
| mRegisteredReadOnlyExceptInHandler = false; |
| } else { |
| Slog.e(LOG_TAG, "Unknown message: " + message.what); |
| return false; |
| } |
| return true; |
| } |
| |
| // Interface for potential clients. |
| public interface FingerprintGestureClient { |
| /** |
| * @return {@code true} if the client is capturing fingerprint gestures |
| */ |
| boolean isCapturingFingerprintGestures(); |
| |
| /** |
| * Callback when gesture detection becomes active or inactive. |
| * |
| * @param active {@code true} when detection is active |
| */ |
| void onFingerprintGestureDetectionActiveChanged(boolean active); |
| |
| /** |
| * Callback when gesture is detected |
| * |
| * @param gesture The identifier for the gesture. For example, |
| * {@link FingerprintGestureController#FINGERPRINT_GESTURE_SWIPE_LEFT} |
| */ |
| void onFingerprintGesture(int gesture); |
| } |
| } |