Android Error Writing Location Data to SQLite Database from LocationListener Class

I have an application wherein I have a service class that implements a locationlistener. I want to be able to pass the location received in onLocationChanged() back to my main activity. I've been trying to implement this so far by writing to a SQLite Database, but have been getting errors when trying to open to database to be writeable. I believe it has something to do with not having the write context, but I haven't been able to figure it out. However, writing to the database works perfectly fine when I do it in onCreate(). I initially just tried doing it as: ``` @Override public void onLocationChanged(Location loc) {//Spits out single location for current disconnect System.out.println("location equals "+loc); latitude=Double.toString(loc.getLatitude()); longitude=Double.toString(loc.getLongitude()); writeToDb(MyLocListener.this,latitude,longitude); man.removeUpdates(listener);//Stops location manager from listening for updates listener=null; man=null; } public void writeToDb(Context context,String latitude,String longitude){ db=new DbAdapter(context); db.openToWrite(); db.deleteAll(); db.insert(latitude); db.insert(longitude); db.close(); } ``` But that was no use, and would give me a nullPointerException on the db.openToWrite() line everytime. getApplicationContext() does not work here either. I've now modified it to write to the DB in a thread as: ``` @Override public void onLocationChanged(Location loc) {//Spits out single location for current disconnect System.out.println("location equals "+loc); latitude=Double.toString(loc.getLatitude()); longitude=Double.toString(loc.getLongitude()); Runnable runner=new SaveLocation(latitude,longitude); new Thread(runner).start(); man.removeUpdates(listener);//Stops location manager from listening for updates listener=null; man=null; } public class SaveLocation implements Runnable{ String latitude; String longitude; // DbAdapter db; public SaveLocation(String latitude,String longitude){ this.latitude=latitude; this.longitude=longitude; } @Override public void run() { db.openToWrite(); db.deleteAll(); db.insert(latitude); db.insert(longitude); db.close(); } } ``` And I initialized the Database in the onCreate() method as: ``` public class MyLocListener extends Service implements LocationListener{ static LocationManager man; static LocationListener listener; static Location location; public DbAdapter db; @Override public void onCreate() { super.onCreate(); this.db=new DbAdapter(MyLocListener.this); } ``` But now, this second attempt keeps giving me a much more condensed error, but it still faults on the line where i attempt to open the database to be writeable. The line MyLocListener.java:92 refers to the line db.openToWrite(); The error is: ``` 05-30 15:35:19.698: W/dalvikvm(4557): threadid=9: thread exiting with uncaught exception (group=0x4001d7e0) 05-30 15:35:19.706: E/AndroidRuntime(4557): FATAL EXCEPTION: Thread-10 05-30 15:35:19.706: E/AndroidRuntime(4557): java.lang.NullPointerException 05-30 15:35:19.706: E/AndroidRuntime(4557): at com.phonehalo.proto.MyLocListener$SaveLocation.run(MyLocListener.java:92) 05-30 15:35:19.706: E/AndroidRuntime(4557): at java.lang.Thread.run(Thread.java:1096) ```