title: getPackageName() returns null
body: <p>I have a method in my android app that returns the <strong>drawable id</strong> according to it's name, this method works so well in the normal cases, but when running it from a separate thread it returns <code>Null</code>, even when running this thread on the <code>UIThread</code>. </p>
  
  <p><em>This method is :</em></p>
  
  <pre><code>public int get_drawable(int status){
       int res;
       res = getResources().getIdentifier("something"+ Integer.toString(status) , "drawable", getPackageName()); // this is the line which throws the Exception
       return res;
  }
  </code></pre>
  
  <p><em>And the Exception:</em></p>
  
  <pre><code>02-04 13:43:14.644: WARN/System.err(594): java.lang.NullPointerException
  02-04 13:43:14.664: WARN/System.err(594):     at android.content.ContextWrapper.getResources(ContextWrapper.java:81)
  02-04 13:43:14.664: WARN/System.err(594):     at com.example.solaceap.HomeView.get_drawable(HomeView.java:525)
  02-04 13:43:14.674: WARN/System.err(594):     at com.example.solaceap.JSONParsing.alter_light(JSONParsing.java:689)
  02-04 13:43:14.674: WARN/System.err(594):     at com.example.solaceap.JSONParsing.parse_hmm_response(JSONParsing.java:297)
  02-04 13:43:14.674: WARN/System.err(594):     at com.example.solaceap.JSONParsing.check_hmm_type(JSONParsing.java:218)
  02-04 13:43:14.684: WARN/System.err(594):     at com.example.solaceap.JSONParsing.parse_hmm_response(JSONParsing.java:170)
  02-04 13:43:14.684: WARN/System.err(594):     at com.example.solaceap.Login.parse_response(Login.java:143)
  02-04 13:43:14.704: WARN/System.err(594):     at com.example.solaceap.Login.response_received(Login.java:129)
  02-04 13:43:14.704: WARN/System.err(594):     at com.example.solaceap.Login$2$1.run(Login.java:106)
  02-04 13:43:14.714: WARN/System.err(594):     at android.os.Handler.handleCallback(Handler.java:605)
  02-04 13:43:14.724: WARN/System.err(594):     at android.os.Handler.dispatchMessage(Handler.java:92)
  02-04 13:43:14.724: WARN/System.err(594):     at android.os.Looper.loop(Looper.java:137)
  02-04 13:43:14.724: WARN/System.err(594):     at android.app.ActivityThread.main(ActivityThread.java:4340)
  02-04 13:43:14.724: WARN/System.err(594):     at java.lang.reflect.Method.invokeNative(Native Method)
  02-04 13:43:14.724: WARN/System.err(594):     at java.lang.reflect.Method.invoke(Method.java:511)
  02-04 13:43:14.724: WARN/System.err(594):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  02-04 13:43:14.734: WARN/System.err(594):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  02-04 13:43:14.734: WARN/System.err(594):     at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p><strong>UPDATE:</strong> </p>
  
  <p>after doing some tries i found that the <code>getPackageName()</code> is the one which throws that Exception, even when tried to statically provide my resources package name it gives me the same result. </p>
  
  <p><code>HomeView</code> is an Activity class in my android app, but the <code>JSONParsing</code> class is a normal java class which calls this method from the <code>HomeView</code>.</p>