title: classnotfoundException getting if i start activity which is in dynamic module after successful download
body: <p>From internal test i could download the dynamic feature module. After successful download i am opening activity which is in dynamic module using package name but i got class not found exception. And i checked APK size but size is not increased. below is my code. Please Help</p>
  
  <p>below is my code for download the module. i used from internal testing which is available in playstore.</p>
  
  <pre><code>     public void loadFeatureTwo() {
      // Builds a request to install the feature1 module
      SplitInstallRequest request =
              SplitInstallRequest
                      .newBuilder()
                      // You can download multiple on demand modules per
                      // request by invoking the following method for each
                      // module you want to install.
                      .addModule("feature2")
                      .build();
  
      // Begin the installation of the feature1 module and handle success/failure
      splitInstallManager
              .startInstall(request)
              .addOnSuccessListener(new OnSuccessListener&lt;Integer&gt;() {
                  @Override
                  public void onSuccess(Integer integer) {
                      // Module download successful
                     /* Intent intent = new Intent().setClassName(getPackageName(), "com.bapspatil.feature2.FeatureTwoActivity");
                      startActivity(intent);*/
  
                      Toast.makeText(getApplicationContext(), "successfully download feature2: ", Toast.LENGTH_LONG).show();
                      try {
                          Intent myIntent = new Intent(MainActivity.this, Class.forName("com.bapspatil.feature2.FeatureTwoActivity"));
                          startActivity(myIntent);
                      } catch (Exception e) {
                          e.printStackTrace();
                      }
                  }
              })
              .addOnFailureListener(new OnFailureListener() {
                  @Override
                  public void onFailure(Exception e) {
                      // Module download failed; handle the error here
                      Toast.makeText(getApplicationContext(), "Couldn't download feature: " + e.getMessage(), Toast.LENGTH_LONG).show();
                  }
              });
  }
  </code></pre>