Null Pointer Exception Causing Force Close While Trying To Run Multiple Threads

I'm trying to run a service in the background that sends texts messages of the location of the phone. In the service I use a Timer. The code that sends the messages runs correctly

Solution 1:

You need to replace

coordinates.equals(null)  

with

coordinates == null

since the first one will never evaluate to true, it will throw a NullPointerException() every time coordinates is null.

Solution 2:

If your coordinates is null then the very first condition oordinates.equals(null) will result into NullPointerException.

In addition, I have one more observation. The comparison coordinates == "" is of no use as you are already using it in right way i.e. coordinates.equals("").

Change your if from

if (coordinates.equals(null) || coordinates.equals("") || 
                                    coordinates == null || coordinates == ""){
    coordinates = "Could Not Receive Location";
}

to

if (coordinates == null || coordinates.equals("")){
    coordinates = "Could Not Receive Location";
}