Question

我正在将我的活动转换为片段，然后我收到一个错误，我认为我只需要添加一些代码，我应该添加什么

 private class AsyncLogin extends AsyncTask<String, String, String> {
    ProgressDialog pdLoading = new ProgressDialog(NotifMainActivity.this);
    HttpURLConnection conn;
    URL url = null;

错误来自“NotifMainActivity.this”，它说“正在进行的对话框无法应用”我已经为您提供了一个图片，以便您实际查看错误。Click here to see the image

更新。所以我已经按照先生Kashif Anwar的建议用getActivity更改了“NotifMainActivity.this”，但这样做使得片段的功能无法工作，也许你可以为我提供另一种解决方案。

以下是片段的整个代码（此片段是recyclerview的活动）

package com.capstone.jmilibraryapp;

import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class NotifMainActivity extends Fragment {

// CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
private RecyclerView mRVFishPrice;
private AdapterNotif mAdapter;

         /*@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_notifmainactivity);
    //Make call to AsyncTask
    new AsyncLogin().execute();
}*/
View myView;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    myView = inflater.inflate(R.layout.activity_notifmainactivity, container, false);
    return myView;
}

private class AsyncLogin extends AsyncTask<String, String, String> {
    ProgressDialog pdLoading = new ProgressDialog(getActivity());
    HttpURLConnection conn;
    URL url = null;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

        //this method will be running on UI thread
        pdLoading.setMessage("\tLoading...");
        pdLoading.setCancelable(false);
        pdLoading.show();

    }

    @Override
    protected String doInBackground(String... params) {
        try {

            // Enter URL address where your json file resides
            // Even you can make call to php file which returns json data
            url = new URL("http://192.168.1.101/notif.php");

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return e.toString();
        }
        try {

            // Setup HttpURLConnection class to send and receive data from php and mysql
            conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(READ_TIMEOUT);
            conn.setConnectTimeout(CONNECTION_TIMEOUT);
            conn.setRequestMethod("GET");

            // setDoOutput to true as we recieve data from json file
            conn.setDoOutput(true);

        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
            return e1.toString();
        }

        try {

            int response_code = conn.getResponseCode();

            // Check if successful connection made
            if (response_code == HttpURLConnection.HTTP_OK) {

                // Read data sent from server
                InputStream input = conn.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                StringBuilder result = new StringBuilder();
                String line;

                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }

                // Pass data to onPostExecute method
                return (result.toString());

            } else {

                return ("unsuccessful");
            }

        } catch (IOException e) {
            e.printStackTrace();
            return e.toString();
        } finally {
            conn.disconnect();
        }


    }

    @Override
    protected void onPostExecute(String result) {

        //this method will be running on UI thread

        pdLoading.dismiss();
        List<DataNotif> data=new ArrayList<>();

        pdLoading.dismiss();
        try {

            JSONArray jArray = new JSONArray(result);

            // Extract data from json and store into ArrayList as class objects
            for(int i=0;i<jArray.length();i++){
                JSONObject json_data = jArray.getJSONObject(i);
                DataNotif fishData = new DataNotif();

                fishData.NotifTitle= json_data.getString("notif_Title");
                fishData.NotifMessage= json_data.getString("notif_Message");
//                    fishData.sizeName= json_data.getString("size_name");
                fishData.Date= json_data.getString("notif_date");
                data.add(fishData);
            }

            // Setup and Handover data to recyclerview
            mRVFishPrice = (RecyclerView)myView.findViewById(R.id.fishPriceList);
            mAdapter = new AdapterNotif(getActivity(), data);
            mRVFishPrice.setAdapter(mAdapter);
            mRVFishPrice.setLayoutManager(new LinearLayoutManager(getActivity()));

        } catch (JSONException e) {
            Toast.makeText(getActivity(), e.toString(), Toast.LENGTH_LONG).show();
            Toast.makeText(getActivity(), "There maybe some error try again",Toast.LENGTH_LONG).show();
        }

    }

}

}

Answer 1

您应该使用getActivity（）而不是类名

像这样

ProgressDialog pd = new ProgressDialog( getActivity() );

希望它有所帮助！

如何将活动的代码转换为片段

1 个答案: