Gostaria de usar oAsyncTask para gerenciar alguma lógica comercial no meu aplicativo. Qual é o melhor padrão para usar oonProgressUpdate(...) método deAsyncTask definido em arquivos separados (não como a classe innter deActivity) Eu tenho duas idéias:
1. A maneira mais simples: criarProgressDialog dentroActivity (usandoonCreateDialog(...) método) e passe a referência à minha subclasse deAsyncTask pelo construtor (substituironProgressUpdate(...) dentro do meuAsyncTask subclasse). A desvantagem desta solução é o uso de componentes da interface do usuário no código da lógica de negócio

FooTask1.java:

public class FooTask1 extends AsyncTask<Void, Integer, Void> {
private ProgressDialog mProgressDialog;

public FooTask1(ProgressDialog progressDialog) {
    super();
    mProgressDialog = progressDialog;
}

@Override
protected Void doInBackground(Void... unused) {
    // time consuming operation
    for (int i=0; i<=100; i++) {
        this.publishProgress(i);
        try {
            Thread.sleep(100);
        } catch (Exception e) {}
    }
    return null;
}

@Override
protected void onProgressUpdate(Integer... progress) {
    mProgressDialog.setProgress(progress[0]);
}

@Override
protected void onPostExecute(Void result) {
    mProgressDialog.dismiss();
}
}

FooActivity1.java:

public class FooActivity1 extends Activity {

  private static final int DIALOG_PROGRESS_ID = 0;
  private ProgressDialog mProgressDialog;

  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);

      showDialog(DIALOG_PROGRESS_ID);
      new FooTask(mProgressDialog).execute();
  }

  @Override
  protected Dialog onCreateDialog(int id) {
      switch(id) {
          case DIALOG_PROGRESS_ID:
             mProgressDialog = new ProgressDialog(this);
             mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
             mProgressDialog.setMessage("Loading...");
             mProgressDialog.setCancelable(false);
             return mProgressDialog;
          default:
             return null;
      }
  }
}

2.A maneira mais sofisticada: substituir oonProgressUpdate(...) método deAsyncTask dentro deActivity classe

FooTask2.java:

public class FooTask2 extends AsyncTask<Void, Integer, Void> {
@Override
protected Void doInBackground(Void... unused) {
    // time consuming operation
    for (int i=0; i<=100; i++) {
        this.publishProgress(i);
        try {
            Thread.sleep(100);
        } catch (Exception e) {}
    }
    return null;
}
}

FooActivity2.java

public class FooActivity2 extends Activity {

private static final int DIALOG_PROGRESS_ID = 0;
private ProgressDialog mProgressDialog;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    showDialog(DIALOG_PROGRESS_ID);
    new FooTaskLoader().execute();
}

@Override
protected Dialog onCreateDialog(int id) {
    switch(id) {
        case DIALOG_PROGRESS_ID:
            mProgressDialog = new ProgressDialog(this);
            mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setCancelable(false);
            return mProgressDialog;
        default:
            return null;
    }
}

private class FooTaskLoader extends FooTask2 {
    @Override
    protected void onProgressUpdate(Integer... progress) {
        mProgressDialog.setProgress(progress[0]);
    }

    @Override
    protected void onPostExecute(Void result) {
        dismissDialog(DIALOG_PROGRESS_ID);
    }
}
}