从碎片中获取当前活动

Question

我有此类用于发送电子邮件和Android

    public class SendMailTask extends AsyncTask {
    private ProgressDialog statusDialog;
    private Activity sendMailActivity;
    public SendMailTask(Activity activity) {
        sendMailActivity = activity;
    }
    protected void onPreExecute() {
        statusDialog = new ProgressDialog(sendMailActivity);
        statusDialog.setMessage("Getting ready...");
        statusDialog.setIndeterminate(false);
        statusDialog.setCancelable(false);
        statusDialog.show();
    }
    @Override
    protected Object doInBackground(Object... args) {
        try {
            Log.i("SendMailTask", "About to instantiate GMail...");
            publishProgress("Processing input....");
            GMail androidEmail = new GMail(args[0].toString(),
                    args[1].toString(), (List) args[2], args[3].toString(),
                    args[4].toString());
            publishProgress("Preparing mail message....");
            androidEmail.createEmailMessage();
            publishProgress("Invio email in corso, sarai ricontattato da un nostro operatore per la conferma");
            androidEmail.sendEmail();
            publishProgress("Email Sent.");
            Log.i("SendMailTask", "Mail Sent.");
        } catch (Exception e) {
            publishProgress(e.getMessage());
            Log.e("SendMailTask", e.getMessage(), e);
        }
        return null;
    }
    @Override
    public void onProgressUpdate(Object... values) {
        statusDialog.setMessage(values[0].toString());
    }
    @Override
    public void onPostExecute(Object result) {
        statusDialog.dismiss();
    }
}

不使用片段，我在主动脉中使用以下代码发送邮件

new SendMailTask(MainActivity.this).execute(fromEmail,
                   fromPassword, toEmailList, emailSubject, emailBody);

，但是现在我需要使用片段，此时我会遇到错误：" MainAttivity，这不是一个封闭的类"

如何解决此错误？

P.S。：对不起，我的英语不好：D

Answer 1

在代码下方更改

new SendMailTask(MainActivity.this).execute(fromEmail,
                   fromPassword, toEmailList, emailSubject, emailBody);

to

new SendMailTask(getActivity()).execute(fromEmail,
                   fromPassword, toEmailList, emailSubject, emailBody);

有关更多详细信息，您可以在下面查看链接。

从片段访问活动

Answer 2

从片段到活动使用以下方式：

((YourActivityName)getActivity()).yourPublicMethod();

从活动到片段使用以下方式：

FragmentManager fragmentManager = getSupportFragmentManager();
//include fragment via layout xml
YourFragmentClass fragment = (YourFragmentClass)fragmentManager.findFragmentById(R.id.your_fragment_id);
fragment.yourPublicMethod();