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POAsyncTask always throw NullPointerException
 

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    <p>I am developing LBS based app in 1.6 version and it is running absolutely fine in it. Earlier its also run fine in updated version like 2.2 &amp; 2.3.3. But now suddenly it starts giving me null pointer exception in AsyncTask class which i have used for background processes. Here is my code snippet with Error Log.</p> <pre><code>public class AndroidLocationActivity extends Activity { public String provider; public double latitude, longitude = 0; public LocationListener locationListener = new MyLocationListener(); public LocationManager locationManager; public CurrentPositionTask getCurrentLocation; public long time=0; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); setCriteria(); runAsyncTask(); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); time = 0; locationManager.removeUpdates(locationListener); } public void setCriteria() { Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); criteria.setAltitudeRequired(false); criteria.setBearingRequired(false); criteria.setCostAllowed(true); criteria.setPowerRequirement(Criteria.POWER_MEDIUM); provider = locationManager.getBestProvider(criteria, true); //Toast.makeText(getApplicationContext(), "Provider - " + provider, Toast.LENGTH_SHORT).show(); if (provider == null) { provider = LocationManager.GPS_PROVIDER; } } public void runAsyncTask() { // TODO Auto-generated method stub if (getCurrentLocation == null) { getCurrentLocation = new CurrentPositionTask(AndroidLocationActivity.this); } if (getCurrentLocation != null) { getCurrentLocation.execute("Searching for Location"); } } public boolean checkConnection() { //ARE WE CONNECTED TO THE NET ConnectivityManager conMgr = (ConnectivityManager) getSystemService (Context.CONNECTIVITY_SERVICE); if (conMgr.getActiveNetworkInfo() != null &amp;&amp; conMgr.getActiveNetworkInfo().isAvailable()&amp;&amp; conMgr.getActiveNetworkInfo().isConnected()) { return true; } else { return false; } } class CurrentPositionTask extends AsyncTask&lt;String, Void, Void&gt; { private ProgressDialog Dialog = new ProgressDialog(AndroidLocationActivity.this); Location location = new Location(locationManager.getLastKnownLocation(provider)); Context context; public CurrentPositionTask(Context mContext) { this.context = mContext; } @Override protected void onPreExecute() { // TODO Auto-generated method stub super.onPreExecute(); time = location.getTime(); Toast.makeText(AndroidLocationActivity.this, String.valueOf(time), Toast.LENGTH_LONG).show(); if (checkConnection()) { //Toast.makeText(getApplicationContext(), "Internet", Toast.LENGTH_LONG).show(); Dialog.setTitle("Loading"); Dialog.setMessage("Searching for Location"); Dialog.show(); locationManager.requestLocationUpdates(provider, 0, 0, locationListener); } else { Toast.makeText(getApplicationContext(), "Internet is Not Available", Toast.LENGTH_LONG).show(); } } @Override protected Void doInBackground(String... params) { // TODO Auto-generated method stub latitude = location.getLatitude(); longitude = location.getLongitude(); if (time &gt;= 100000) { latitude = 0; longitude = 0; } while (latitude == 0 &amp;&amp; longitude == 0) { /*latitude = (float) (location.getLatitude()); longitude = (float) (location.getLongitude());*/ } return null; } @Override protected void onPostExecute(Void result) { // TODO Auto-generated method stub Toast.makeText(AndroidLocationActivity.this, "Location Floats:- " + latitude + "," + longitude, Toast.LENGTH_LONG).show(); super.onPostExecute(result); if (Dialog != null &amp;&amp; Dialog.isShowing()) { Dialog.dismiss(); time=0; Intent homeIntent = new Intent(AndroidLocationActivity.this.getApplicationContext(), HomeMenuActivity.class); homeIntent.putExtra("lat", latitude); homeIntent.putExtra("lng", longitude); startActivity(homeIntent); } locationManager.removeUpdates(locationListener); } } class MyLocationListener implements LocationListener { @Override public void onLocationChanged(Location location) { // TODO Auto-generated method stub latitude = location.getLatitude(); longitude = location.getLongitude(); } @Override public void onProviderDisabled(String arg0) { // TODO Auto-generated method stub Toast.makeText( getApplicationContext(),"Gps Disabled",Toast.LENGTH_SHORT).show(); } @Override public void onProviderEnabled(String arg0) { // TODO Auto-generated method stub Toast.makeText( getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show(); } @Override public void onStatusChanged(String arg0, int arg1, Bundle arg2) { // TODO Auto-generated method stub } } </code></pre> <p>}</p> <p><strong>Error Log:-</strong></p> <pre><code>12-04 16:59:04.848: E/AndroidRuntime(4165): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidlocation/com.androidlocation.AndroidLocationActivity}: java.lang.NullPointerException 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1659) 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675) 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.app.ActivityThread.access$1500(ActivityThread.java:121) 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:943) 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.os.Handler.dispatchMessage(Handler.java:99) 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.os.Looper.loop(Looper.java:123) 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.app.ActivityThread.main(ActivityThread.java:3701) 12-04 16:59:04.848: E/AndroidRuntime(4165): at java.lang.reflect.Method.invokeNative(Native Method) 12-04 16:59:04.848: E/AndroidRuntime(4165): at java.lang.reflect.Method.invoke(Method.java:507) 12-04 16:59:04.848: E/AndroidRuntime(4165): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:862) 12-04 16:59:04.848: E/AndroidRuntime(4165): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620) 12-04 16:59:04.848: E/AndroidRuntime(4165): at dalvik.system.NativeStart.main(Native Method) 12-04 16:59:04.848: E/AndroidRuntime(4165): Caused by: java.lang.NullPointerException 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.location.Location.set(Location.java:119) 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.location.Location.&lt;init&gt;(Location.java:112) **12-04 16:59:04.848: E/AndroidRuntime(4165): at com.androidlocation.AndroidLocationActivity$CurrentPositionTask.&lt;init&gt;(AndroidLocationActivity.java:84)** 12-04 16:59:04.848: E/AndroidRuntime(4165): at com.androidlocation.AndroidLocationActivity.runAsyncTask(AndroidLocationActivity.java:60) 12-04 16:59:04.848: E/AndroidRuntime(4165): at com.androidlocation.AndroidLocationActivity.onCreate(AndroidLocationActivity.java:31) 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 12-04 16:59:04.848: E/AndroidRuntime(4165): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1623) </code></pre> <p>3error which i got from log, 1 in calling the runAsyncTask() method, 2 at the time of creating object of async task class and 3rd at the time of initializing the location variable in asynctask class.</p> <p>Please if anybody has any idea about this please help me to solved it out. Thanks...</p>
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    1. COdoInBackGround is supposed to do the heavy tasks. As far as I see most of the heavy tasks are in preExecute. doinBackGround runs in a worker thread. Is it supposed to update the members defined on the UI thread directly?
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    2. CONo i am not updating UI thread directly....And i am calling requestUpdates method in preExecute as if i call it from doInBackground it gives me error.
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    3. COAnyone has any idea about this error? Please kindly help me if anyone knows anything about this. Thanks
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