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;
    }

}

MainActivity.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");

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

上添加这个

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

用于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

您在内部 class 中调用了外部 class 方法，您应该将 MainActivity.getFragmentManager() 更改为 MainActivity.this.getFragmentManager()

Answer 2

我解决了这个问题： 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;
    }

}

MainActivity.java

private class HttpAsyncTask extends AsyncTask<String, Void, String> {
        ProgressDialogFragment progressDialog = new ProgressDialogFragment();

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

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

            return UpdateData(MainActivity.this, urls[0], login);
        }
        // onPostExecute displays the results of the AsyncTask.
        @Override
        protected void onPostExecute(String result) {
            progressDialog.dismiss();
            startActivity(new Intent(getApplicationContext(), MainActivity.class));
            finish();
              Log.d("posted", result);
            Toast.makeText(getBaseContext(), "Display Name Successful Changed!", Toast.LENGTH_LONG).show();
        }
    }

关于

的第一个问题

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

我由@Gennadii Saprykin 和 handrenliang 使用以下代码修复：

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

到

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

第二个错误：

Error:(216, 27) 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)

由@handrenliang 修复，如下所示：使用了 android-v4 DialogFragment，但您的 activity 不是 v4，您可以在 ProgressDialogFragment 中导入非 v4 DialogFragment。

import android.support.v4.app.DialogFragment;

到

import android.app.DialogFragment;

最后一个崩溃错误，我只是将对话框声明从 MainActivity Class 移动到 HttpAsyncTask Class.

内部

ProgressDialogFragment progressDialog = new ProgressDialogFragment();

感谢@Gennadii Saprykin 和@handrenliang 寻求帮助。

android: 如何在 MainActivity 中显示 ProgressDialogFragment

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