android - 防止后退按钮取消 DialogFragment

Question

我有一个可以创建和弹出 DialogFragment 的 Fragment，但是当我点击后退按钮时，即使我明确调用 setCancelable(false); 也会关闭该对话框；有什么方法可以让我的 DialogFragment 对后退按钮不敏感？

public class LoadingDialogFragment extends DialogFragment
{
    String title;
    String msg;

    public LoadingDialogFragment()
    {
        this.title = "Loading...";
        this.msg = "Please wait...";
    }
    public LoadingDialogFragment(String title, String msg)
    {
        this.title = title;
        this.msg = msg;
    }

    @Override
    public Dialog onCreateDialog(final Bundle savedInstanceState)
    {
        final ProgressDialog dialog = new ProgressDialog(getActivity());

        dialog.setTitle(title);
        dialog.setMessage(msg);
        dialog.setIndeterminate(true);
        dialog.setCanceledOnTouchOutside(false);
        dialog.setCancelable(false);

        return dialog;
    }

}

我从 AsyncTask 创建 DialogFragment:

private class GpsTask extends AsyncTask<String, Integer, Integer>
{
    //ProgressDialog dialog;
    @Override
    protected void onPreExecute()
    {
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        DialogFragment newFragment = new LoadingDialogFragment("Gathering Location", "Acquiring GPS lock...");
        ft.addToBackStack(null);
        newFragment.show(ft, "dialog");
    }

    @Override
    protected Integer doInBackground(String... params)
    {
        //acquire a GPS lock and grab a few position updates
    }

    @Override
    protected void onProgressUpdate(Integer... input) { }

    @Override
    protected void onPostExecute(Integer result)
    {
        getSupportFragmentManager().popBackStackImmediate();
    }
}

Answer 1

如何使用setCancelable ?你试过了吗？

来自文档:

Control whether the shown Dialog is cancelable. Use this instead ofdirectly calling Dialog.setCancelable(boolean), because DialogFragmentneeds to change its behavior based on this

用于自定义 DialogFragment

在 onCreateDialog

处添加 isCancelable = false