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PONullpointerException when I try to set a EditText with information from another class
 

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  1. PONullpointerException when I try to set a EditText with information from another class
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    <p>i´ve read a lot of post that had almost the same question but it doesn´t help me with my problem, the thing is that I am trying to create an app to constantly update the information in 2 EditTexts for Latitude and Longitude using the GPS of the device. In tutorials I had seen they create the classes inside the MainActivity so I try to do almost the same but creating a new class file. When I send the information to the MainActivity it reach the EditText but it seems that those cannot be filled with the information I don't know why... Thinking that It could be the threads I try to implement a AsynkTask (but my android skills are not to high) and i am having the same error... If some one could help me I whould be really Greatfull! I post the code next...</p> <p>This is the <strong>MainActivity</strong></p> <pre><code>public class MainActivity extends Activity { public EditText edTLatitud; public EditText edTLongitud; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); edTLatitud = (EditText)this.findViewById(R.id.edTxtLatitud); edTLongitud = (EditText)this.findViewById(R.id.edTxtLongitud); ConfigGps(); } private void ConfigGps() { LocationManager mLocationManager; LocationListener mLocationListener; mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); mLocationListener = new MyLocationListener(); mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,5000, 1, mLocationListener); } </code></pre> <p>This is the <strong>new file class</strong></p> <pre><code>public class MyLocationListener implements LocationListener{ private MainActivity mainActivity = new MainActivity(); private GPSBackground gpsBackground = new GPSBackground(); private String Latitud,Longitud; @Override public void onLocationChanged(Location location) { gpsBackground.execute(location); } @Override public void onStatusChanged(String provider, int status, Bundle extras) { } @Override public void onProviderEnabled(String provider) { } @Override public void onProviderDisabled(String provider) { } private class GPSBackground extends AsyncTask&lt;Location, Void,Void&gt; { @Override protected Void doInBackground(Location... params) { Location location = params[0]; try{ mainActivity.edTLatitud.setText(String.valueOf(location.getLatitude())); mainActivity.edTLongitud.setText(String.valueOf(location.getLongitude())); } catch (Exception e) { e.printStackTrace(); } return null; } } } </code></pre> <p>The error I catch is this one:</p> <pre> 563-572/com.apps3d.logixuexapp W/System.err: java.lang.NullPointerException 08-22 18:57:40.745 563-572/com.apps3d.logixuexapp W/System.err: at com.apps3d.logixuexapp.MyLocationListener$GPSBackground.doInBackground(MyLocationListener.java:50) 08-22 18:57:40.745 563-572/com.apps3d.logixuexapp W/System.err: at com.apps3d.logixuexapp.MyLocationListener$GPSBackground.doInBackground(MyLocationListener.java:42) 08-22 18:57:40.755 563-572/com.apps3d.logixuexapp W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:185) 08-22 18:57:40.755 563-572/com.apps3d.logixuexapp W/System.err: at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 08-22 18:57:40.755 563-572/com.apps3d.logixuexapp W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:138) 08-22 18:57:40.755 563-572/com.apps3d.logixuexapp W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 08-22 18:57:40.755 563-572/com.apps3d.logixuexapp W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 08-22 18:57:40.755 563-572/com.apps3d.logixuexapp W/System.err: at java.lang.Thread.run(Thread.java:1019) </pre> <p>Well if i am doing something wrong please give me a hand, I am new on this of android development jejej Thanks !!</p>
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    1. COWhere is line 50 of MyLocationListener.java?
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    2. CO`private MainActivity mainActivity = new MainActivity();` This line looks suspicious. What are the reasons for manually creating a new `Activity`?
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    3. COwell I though That this way I was referencing the MainActivity to use the EditTexts
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