android - 在 DialogFragment 中显示来自互联网的信息

Question

我想在一个 DialogFragment 中显示来自互联网的信息，我有一些疑问，如下:

1 - 为此，我在 DialogFragment 中实现了一个 AsynkTask，但我的 Activity 同时运行另一个 AsynkTask，因此 dialogfragment 需要等待 Activity 完成 AsynkTask。是否可以在 Activity 之前从 DialogFragment 执行 AsynkTask？

2 - 我尝试在 DialogFragment 中使用一个 DialogProgress，但它在 Activity 中显示，如何在 DialogFragment 中显示？

3 - 在没有AsyncTask的情况下DialogFragment是否可以从互联网上查询信息？

public class DialogFotoFragment extends DialogFragment {

private String latitude;
private String longitude;
private Handler hndl = new Handler();

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.dialog_foto_ponto, container);

    // Verifica se a latitude e lngitude foram informados
    if (latitude == null || latitude.trim().length() == 0) {
        Toast.makeText(this.getActivity(),
                "Não foi possível apresentar a foto", Toast.LENGTH_LONG)
                .show();
        this.dismiss();
    }

    if (longitude == null || longitude.trim().length() == 0) {
        Toast.makeText(this.getActivity(),
                "Não foi possível apresentar a foto", Toast.LENGTH_LONG)
                .show();
        this.dismiss();
    }

    ImageView img = (ImageView) view.findViewById(R.id.fotoPonto);
    Button btn = (Button) view.findViewById(R.id.btnOKDialogFoto);

    btn.setOnClickListener(buttonOk);

    ProgressDialog pDialog = ProgressDialog.show(getActivity(), "",
            "Wait...", true);

    // Apresenta tela de aguarde
    ConsultaFotoBackGround consultaFoto = new ConsultaFotoBackGround();
    Object[] objs = new Object[3];
    objs[0] = img;
    objs[1] = this;
    objs[2] = pDialog;
    consultaFoto.execute(objs);
    return view;
}

private OnClickListener buttonOk = new OnClickListener() {

    @Override
    public void onClick(View arg0) {
        DialogFotoFragment.this.dismiss();
    }
};

public String getLatitude() {
    return latitude;
}

public void setLatitude(String latitude) {
    this.latitude = latitude;
}

public String getLongitude() {
    return longitude;
}

public void setLongitude(String longitude) {
    this.longitude = longitude;
}

private class ConsultaFotoBackGround extends
        AsyncTask<Object, Void, Object[]> {

    private Handler hndl = new Handler();
    Drawable fotoInternet;
    ImageView img;
    ProgressDialog pDialog;

    @Override
    protected Object[] doInBackground(Object... objs) {
        img = (ImageView) objs[0];
        DialogFotoFragment classe = (DialogFotoFragment) objs[1];
        pDialog = (ProgressDialog)objs[2];

        try {
            fotoInternet = Utilities.LoadImagePonto(latitude,
                    longitude);
            showFoto();
        } catch (Exception e) {
            Toast.makeText(classe.getActivity(),
                    "Não foi possível apresentar a foto", Toast.LENGTH_LONG)
                    .show();
            classe.dismiss();
        }
        return objs;
    }

    @Override
    protected void onPostExecute(Object[] result) {
    }

    protected void showFoto() {
        hndl.post(new Runnable() {
            @Override
            public void run() {
                img.setImageDrawable(fotoInternet);
                pDialog.dismiss();
            }
        });
    }
}

}

Answer 1

你不能使用 AsyncTask 获取你需要的信息然后在它的 onPostExecute 中你可以用你的数据创建一个 DialogFragment刚刚得到。

按照官方文档了解如何正确创建对话框(即使使用自定义布局):http://developer.android.com/guide/topics/ui/dialogs.html