core/java/android/app/timedetector/TimeDetector.java

/*
 * Copyright (C) 2018 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.app.timedetector;

import android.annotation.NonNull;
import android.annotation.RequiresPermission;
import android.annotation.SystemService;
import android.content.Context;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.ServiceManager.ServiceNotFoundException;
import android.os.SystemClock;
import android.util.Log;
import android.util.TimestampedValue;

/**
 * The interface through which system components can send signals to the TimeDetectorService.
 * @hide
 */
@SystemService(Context.TIME_DETECTOR_SERVICE)
public class TimeDetector {
    private static final String TAG = "timedetector.TimeDetector";
    private static final boolean DEBUG = false;

    private final ITimeDetectorService mITimeDetectorService;

    public TimeDetector() throws ServiceNotFoundException {
        mITimeDetectorService = ITimeDetectorService.Stub.asInterface(
                ServiceManager.getServiceOrThrow(Context.TIME_DETECTOR_SERVICE));
    }

    /**
     * Suggests the current phone-signal derived time to the detector. The detector may ignore the
     * signal if better signals are available such as those that come from more reliable sources or
     * were determined more recently.
     */
    @RequiresPermission(android.Manifest.permission.SET_TIME)
    public void suggestPhoneTime(@NonNull PhoneTimeSuggestion timeSuggestion) {
        if (DEBUG) {
            Log.d(TAG, "suggestPhoneTime called: " + timeSuggestion);
        }
        try {
            mITimeDetectorService.suggestPhoneTime(timeSuggestion);
        } catch (RemoteException e) {
            throw e.rethrowFromSystemServer();
        }
    }

    /**
     * Suggests the user's manually entered current time to the detector.
     */
    @RequiresPermission(android.Manifest.permission.SET_TIME)
    public void suggestManualTime(@NonNull ManualTimeSuggestion timeSuggestion) {
        if (DEBUG) {
            Log.d(TAG, "suggestManualTime called: " + timeSuggestion);
        }
        try {
            mITimeDetectorService.suggestManualTime(timeSuggestion);
        } catch (RemoteException e) {
            throw e.rethrowFromSystemServer();
        }
    }

    /**
     * A shared utility method to create a {@link ManualTimeSuggestion}.
     */
    public static ManualTimeSuggestion createManualTimeSuggestion(long when, String why) {
        TimestampedValue<Long> utcTime =
                new TimestampedValue<>(SystemClock.elapsedRealtime(), when);
        ManualTimeSuggestion manualTimeSuggestion = new ManualTimeSuggestion(utcTime);
        manualTimeSuggestion.addDebugInfo(why);
        return manualTimeSuggestion;
    }
}