java - android: 如何在 MainActivity 中显示 ProgressDialogFragment

Question

我在下面的代码中遇到了一些问题，当我构建应用程序时，它在 MainActivity 端显示错误。下面是代码:ProgressDialogFragment.java

public class ProgressDialogFragment extends DialogFragment
{

    public static ProgressDialogFragment newInstance() {
        ProgressDialogFragment frag = new ProgressDialogFragment ();
        return frag;
    }

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setCancelable(false);
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        ProgressDialog dialog = new ProgressDialog(getActivity(), getTheme());
        dialog.setTitle(getString(R.string.updatename_loading_title));
        dialog.setMessage(getString(R.string.updatename_loading_message));
        dialog.setIndeterminate(true);
        dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        return dialog;
    }

}

主 Activity .java

public void doPositiveClick(DialogFragment dialog) {
                Dialog dialogView = dialog.getDialog();
                EditText editName = (EditText) dialogView.findViewById(R.id.editName);
                String updateName = editName.getText().toString().trim();
                    login.setName(updateName);
                    new HttpAsyncTask().execute(uNameUrl);
                    dialogView.dismiss();
            }

        private class HttpAsyncTask extends AsyncTask<String, Void, String> {

                @Override
                protected void onPreExecute() {
                    super.onPreExecute();
                   progressDialog.show(MainActivity.getFragmentManager(),"loading");
                }

                @Override
                protected String doInBackground(String... urls) {

                    // Do Action Here
                }
    }

我想在提交后显示加载，但在下面一行出现错误:

progressDialog.show(MainActivity.getFragmentManager(),"loading"); 

在我构建应用程序后显示以下错误消息。

Error:(216, 45) error: non-static method getFragmentManager() cannot be referenced from a static context

我该如何解决这个问题？谢谢

@编辑我修复了第一个错误，我只是忘了在 ProgressDialogFragment.java 上添加它

@Override
    public void show(FragmentManager manager, String tag) {
        if (manager.findFragmentByTag(tag) == null) {
            super.show(manager, tag);
        }
    }

防止旋转手机时出现重复对话框。现在出现第二个错误

Error:(40, 5) error: method does not override or implement a method from a supertype
Error:(43, 18) error: no suitable method found for show(android.app.FragmentManager,String)
        method DialogFragment.show(android.support.v4.app.FragmentManager,String) is not applicable
        (argument mismatch; android.app.FragmentManager cannot be converted to android.support.v4.app.FragmentManager)
        method DialogFragment.show(FragmentTransaction,String) is not applicable
        (argument mismatch; android.app.FragmentManager cannot be converted to FragmentTransaction)

Answer 1

你是在内部类中调用外部类方法，你应该把MainActivity.getFragmentManager()改成MainActivity.this.getFragmentManager()