title: Android assetManager getAsset() throwing nullPointer exception
body: <p>I have 2 classes, from class BinderData, which extends BaseAdapter (I can't extend this class to Activity as I have to extend to BaseAdapter) I am calling class AssetActivity by following code:</p>
  
  <pre><code>AssetActivity a = new AssetActivity();
  Drawable image=a.getImage(imageUri);
  </code></pre>
  
  <p>Here imageuri is a string and it is populated properly.In the AssetActivity class following code I am using.</p>
  
  <pre><code>public class AssetActivity extends Activity {
      private static final String TAG = "AssetActivity";
  
      public Drawable getImage(String imgName) {
  
          String nextImageName = imgName+ ".jpg";
          AssetManager assets = getAssets(); // get app's AssetManager
          InputStream stream; // used to read in Image images     
          Drawable flag=null;
          try {
              // get an InputStream to the asset representing the next Image
              stream = assets.open(nextImageName );
  
              // load the asset as a Drawable and display on the objImageView
               flag = Drawable.createFromStream(stream, nextImageName);
          } // end try
          catch (IOException e) {
              Log.e(TAG, "Error loading " + nextImageName, e);
          } // end catch
          return flag;
      }
  } 
  </code></pre>
  
  <p>When I am running the code I am getting NullPointerException at following line. </p>
  
  <pre><code>AssetManager assets = getAssets();
  </code></pre>
  
  <p>There are assets at the asset folder and I am able to fetch them in some other class which explicitly calls getAssets() method and that class extends Activity. Please help me with this. I am suspecting that I am doing something wrong in calling getImage method in BinderData class. Please help me. Thanks.</p>