com.nus.cs4222.isbtracker.ActivityRecognitionIntentService.java Source code

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Here is the source code for com.nus.cs4222.isbtracker.ActivityRecognitionIntentService.java

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/*
 * Copyright (C) 2013 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.nus.cs4222.isbtracker;

import android.support.v4.content.LocalBroadcastManager;
import com.google.android.gms.location.ActivityRecognitionResult;
import com.google.android.gms.location.DetectedActivity;

import android.app.IntentService;
import android.content.Intent;
import android.util.Log;

/**
 * Service that receives ActivityRecognition updates. It receives updates
 * in the background, even if the main Activity is not visible.
 */
public class ActivityRecognitionIntentService extends IntentService {
    public ActivityRecognitionIntentService() {
        // Set the label for the service's background thread
        super("ActivityRecognitionIntentService");
    }

    /**
     * Called when a new activity detection update is available.
     */
    @Override
    protected void onHandleIntent(Intent intent) {

        // If the incoming intent contains an update
        if (ActivityRecognitionResult.hasResult(intent)) {
            // Get the update
            ActivityRecognitionResult result = ActivityRecognitionResult.extractResult(intent);
            // Get the most probable activity
            DetectedActivity mostProbableActivity = result.getMostProbableActivity();
            /*
             * Get the probability that this activity is the
             * the user's actual activity
             */
            int confidence = mostProbableActivity.getConfidence();
            /*
             * Get an integer describing the type of activity
             */
            int activityType = mostProbableActivity.getType();
            String activityName = getNameFromType(activityType);
            /*
             * At this point, you have retrieved all the information
             * for the current update. You can display this
             * information to the user in a notification, or
             * send it to an Activity or Service in a broadcast
             * Intent.
             */
            Log.v("ActivityRecognitionResult", String.format("%s %d", activityName, confidence));

            // Broadcast the result back to ScannerService
            // XXX: This class can probably be skipped entirely
            reportNewActivity(result);
        } else {
            /*
             * This implementation ignores intents that don't contain
             * an activity update. If you wish, you can report them as
             * errors.
             */
        }
    }

    /**
     * Map detected activity types to strings
     *
     * @param activityType The detected activity type
     * @return A user-readable name for the type
     */
    private String getNameFromType(int activityType) {
        switch (activityType) {
        case DetectedActivity.IN_VEHICLE:
            return "in_vehicle";
        case DetectedActivity.ON_BICYCLE:
            return "on_bicycle";
        case DetectedActivity.ON_FOOT:
            return "on_foot";
        case DetectedActivity.STILL:
            return "still";
        case DetectedActivity.UNKNOWN:
            return "unknown";
        case DetectedActivity.TILTING:
            return "tilting";
        }
        return "unknown";
    }

    private void reportNewActivity(ActivityRecognitionResult result) {
        Intent intent = new Intent(ScannerService.UPDATE_TOPIC);
        intent.putExtra(Intent.EXTRA_SUBJECT, ActivityRecognitionHelper.ACTIVITY_RECOGNITION_EXTRA_SUBJECT);
        intent.putExtra(ActivityRecognitionHelper.ACTIVITY_RECOGNITION_RESULT, result);
        LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
    }
}