androidhandlertimertaskquitlocalbroadcastmanager

How to implement the timer to run inside Alarm Receiver even after the app quits?


I have used Alarm Service. I have implemented the the alarm to run on every 1 minute. So the broadcast receiver onReceive method gets called even after the app quits. I want to implement a timer inside of this onReceive method. I have to start location tracking and wait for 20 Seconds after that I need to stop the location tracking.

I have tried the below,

TimerTask
Handler
Local Broadcast Receiver

But all the above not capable of running once the app quits.

Inside the alarm receiver I want to implement timer to wait for 20 seconds.
How can I achieve this when the app is in quit state?

My AlaramReceiver onReceive Method:

 @Override
public void onReceive(Context context, Intent intent) {
    mContext = context;
    mSharedPrefManager = SharedPrefManager.getInstance(mContext);

    mAppUtilInstance.logDebugMessage(TAG, "Track interval alarm receiver.");

    // // Check the preference having any current activity
    if (mSharedPrefManager.checkForCurrentActivityPref()) {
        userActivity = mSharedPrefManager.getCurrentUserActivityPref();

        if (mSharedPrefManager.getIsUserMovedPref()) {
            // User MOVED
            // Call the location service
            LocationUpdateTimer locationUpdateTimer = new LocationUpdateTimer(
            mContext, userActivity, true);
                locationUpdateTimer.initialize();
            mSharedPrefManager.setIsUserMovedPref(false);
        } else {
            // User not MOVED in between the track interval period. He is
            // IDLE
            // Check whether the location information is returned by the
            // google API
            if (mSharedPrefManager.checkForLocationEntityPref()
                    && mSharedPrefManager.getLocationEntityPref()
                            .getLatitude().length() > 0) {
                // Send the packet information to the Fleetilla server
                StoreAndSendLocationInformation storeAndSendLocationInformation = new StoreAndSendLocationInformation(
                        mContext,
                        mSharedPrefManager.getLocationEntityPref(),
                        userActivity);
                storeAndSendLocationInformation.storeAndSend();
            } else {
                // If the location information is not available
                mAppUtilInstance
                        .logDebugMessage(TAG,
                                "Location information is not generated to store and send.");
            }
        }
    }
}

Location Update Timer Class:

/**
 * LocationUpdateTimer Constructor
 */
public LocationUpdateTimer(Context context, String userActivity,
        boolean isTosend) {
    // Save the context
    mContext = context;
    mUserCurrentActivity = userActivity;
    isToSendLocationInfo = isTosend;
}

/**
 * To start the location reporting
 */
private void startLocationReporting() {
    if (mLocationProviderStatusListener != null) {
        mLocationProviderStatusListener
                .requestLocationProvidersToUpdateStatus(mConstants.EMPTY_STRING);
        scheduleTimerTask();
    }
}

/**
 * To schedule the 20 seconds timer task to get the best location
 * information and send it to Fleetilla server.
 */
private void scheduleTimerTask() {
    bestGPSInfoTimerHandler = new Handler();
    bestGPSInfoTimerHandler.postDelayed(bestGPSInfoRunnable,
            Constants.TIMER_TASK_DELAY);
    mAppUtilInstance.logDebugMessage(TAG,
            "20 Sec Location Update TimerTask Scheduled");
}

/**
 * To cancel the timer tack which was scheduled for 30sec location update
 */
private void cancelTimerTask() {
    if (bestGPSInfoTimerHandler != null) {
        mAppUtilInstance.logDebugMessage(TAG, "20 sec TimerTask canceled");
        bestGPSInfoTimerHandler.removeCallbacks(bestGPSInfoRunnable);
        bestGPSInfoTimerHandler = null;
    }
}
/**
 * A runnable will be called after the 20 sec time interval
 */
Runnable bestGPSInfoRunnable = new Runnable() {
    @Override
    public void run() {
        // Called after 20 seconds
        mAppUtilInstance.logDebugMessage(TAG,
                "TimerTask running after 20 sec interval.");
        stopLocationReporting();
        cancelTimerTask();

        if (isToSendLocationInfo) {
            // Check whether the location information is returned by the
            // google api
            if (mSharedPrefManager.checkForLocationEntityPref()
                    && mSharedPrefManager.getLocationEntityPref()
                            .getLatitude().length() > 0) {
                // Send the packet information to the server
                StoreAndSendLocationInformation storeAndSendLocationInformation = new StoreAndSendLocationInformation(
                        mContext,
                        mSharedPrefManager.getLocationEntityPref(),
                        mUserCurrentActivity);
                storeAndSendLocationInformation.storeAndSend();
            } else {
                // If the location information is not available
                mAppUtilInstance
                        .logDebugMessage(TAG,
                                "Location information is not generated to store and send.");
                mAppUtilInstance
                        .broadcastStatusMessage(
                                mContext,
                                Constants.STATUS_MSG_127
                                        + "Location information is not generated to store and send.",
                                Constants.STATUS_CODE_127);
            }
        }

    }
};

Solution

  • Since Android API 11 you can call the goAsync() in onReceive() method. This method returns an object of the PendingResult type. The Android system considers the receiver as alive until you call the PendingResult.finish() on this object. With this option you can trigger asynchronous processing in a receiver. As soon as that thread has completed, its task calls finish() to indicate to the Android system that this component can be recycled.

    Here is one Sample Project to demonstrate goAsync() on BroadcastReceiver.