Develop Reference

Progress Dialog not displaying using Context in Android

I have a dialog fragment Java class which showing a dialog box it works so fine but the only problem is that the progressDialog is not showing while waiting for the response, this is different from the dialog box, this progressDialog works in AsyncTask while getting the response from the http.
here is my code:
package com.example.kapoyei.hatidtubigan.helper;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Looper;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatDialogFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.example.kapoyei.hatidtubigan.R;
import com.example.kapoyei.hatidtubigan.other.Http;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import static android.content.Context.CONNECTIVITY_SERVICE;
public class AddStation extends AppCompatDialogFragment implements View.OnClickListener {
public static String jsonObject; // THIS WILL BE THE HANDLER OF JSON LATER
Button btnCreate; // GET THE BUTTON
EditText etStationName, etAddress, etContact; // GET THE INPUT TEXT
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// CREATE A DIALOG BOX
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
// GET THE LAYOUT
LayoutInflater inflater = getActivity().getLayoutInflater();
View view = inflater.inflate(R.layout.layout_addstation, null);
builder.setView(view);
builder.setCancelable(true);
// GET THE VALUES
etStationName = (EditText) view.findViewById(R.id.etStationName);
etAddress = (EditText) view.findViewById(R.id.etAddress);
etContact = (EditText) view.findViewById(R.id.etContact);
btnCreate = (Button) view.findViewById(R.id.btnCreate);
// SET CLICK LISTENER OF THE BUTTON
btnCreate.setOnClickListener(this);
return builder.create();
}
#Override
public void onClick(View view) {
if(view.getId() == R.id.btnCreate) {
if(etStationName.getText().toString().isEmpty() || etAddress.getText().toString().isEmpty() || etContact.getText().toString().isEmpty()) {
Toast.makeText(getActivity(), "All inputs are required!", Toast.LENGTH_LONG).show();
} else {
if(isNetworkAvailable()) {
Thread stationThread = new Thread() {
#Override
public void run() {
Looper.prepare();
String param = "n=" + etStationName.getText().toString() + "&a=" + etAddress.getText().toString() + "&c=" + etContact.getText().toString();
String endpoint = Http.url + "?type=addstation&" + param;
endpoint = endpoint.replace(" ", "%20");
new AddStation.StoreStation(getActivity()).execute(endpoint);
}
};
stationThread.start();
} else {
Toast.makeText(getActivity(), "Network unavailable", Toast.LENGTH_LONG).show();
}
}
}
}
public class StoreStation extends AsyncTask<String, Void, String> {
ProgressDialog pd;
private Context mContext;
public StoreStation(Context c) {
mContext = c;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
pd = new ProgressDialog(mContext);
pd.setMessage("Adding station ...");
pd.setCancelable(false);
pd.show();
}
#Override
protected void onPostExecute(String result) {
pd.cancel();
getResponse(result);
}
#Override
protected String doInBackground(String... url) {
String data = "";
jsonObject = "";
try {
String link = (String) url[0];
URL getURL = new URL(link);
HttpURLConnection huc = (HttpURLConnection) getURL.openConnection();
huc.setReadTimeout(10000);
huc.setConnectTimeout(15000);
huc.setRequestMethod("GET");
huc.setDoInput(true);
huc.connect();
InputStream is = huc.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
while((data = reader.readLine()) != null) {
jsonObject += data;
}
Log.i("", jsonObject);
return jsonObject;
} catch(Exception e) {
e.printStackTrace();
}
return null;
}
private void getResponse(String json) {
if(json != null) {
try {
JSONObject jobj = new JSONObject(json);
JSONArray jarray = jobj.getJSONArray("station");
String result = "";
for(int i = 0; i < jarray.length(); i++) {
JSONObject obj = jarray.getJSONObject(i);
result = obj.getString("result");
}
if(result.equalsIgnoreCase("done")) {
Toast.makeText(mContext, "Successfully save!", Toast.LENGTH_LONG).show();
}
if(result.equalsIgnoreCase("exists")) {
Toast.makeText(mContext, "Station is already exists!", Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Toast.makeText(mContext, "Connection problem", Toast.LENGTH_LONG).show();
}
}
}
private boolean isNetworkAvailable() {
ConnectivityManager cm = (ConnectivityManager) getActivity().getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo ni = cm.getActiveNetworkInfo();
return ni != null && ni.isConnected();
}
}

In Android, only Main thread /UI thread can update UI
Other thread cannot update UI but your code is trying to run asynch task(which is a thread which run off/on UI accordingly, awesome!) in a worker thread which is causing the issues.
Solution: Execute Asynch task on UI thread
public void onClick(View view) {
if(view.getId() == R.id.btnCreate) {
if(etStationName.getText().toString().isEmpty() || etAddress.getText().toString().isEmpty() || etContact.getText().toString().isEmpty()) {
Toast.makeText(getActivity(), "All inputs are required!", Toast.LENGTH_LONG).show();
} else {
if(isNetworkAvailable()) {
String param = "n=" + etStationName.getText().toString() + "&a=" + etAddress.getText().toString() + "&c=" + etContact.getText().toString();
String endpoint = Http.url + "?type=addstation&" + param;
endpoint = endpoint.replace(" ", "%20");
new AddStation.StoreStation(getActivity()).execute(endpoint);
} else {
Toast.makeText(getActivity(), "Network unavailable", Toast.LENGTH_LONG).show();
}
}
}
}

I have to add edittext input at city position and add it to url

/* Here the last parameter is taken from edittext but it is not adding input from
edittext */ Please check:
http://103.75.33.98/BPService/GetAllBPService.svc/GetSalesPersonNo/CBS/NOIDA/ADMIN
package com.example.administrator.spinnerval;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
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 SalesActivity extends AppCompatActivity {
StringBuffer buffer = new StringBuffer();
List<String> salesPeName = new ArrayList<String>();
HttpURLConnection connection;
BufferedReader reader;
ProgressDialog pdLoading;
String username = "CBS";
String password = "NOIDA";
String city="" ;
String myurl;
ArrayAdapter adapter;
URL url;
AutoCompleteTextView acTextView;
//String url="http://103.75.33.98/BPService/GetAllBPService.svc/GetSalesPersonNo/";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sales);
acTextView = (AutoCompleteTextView) findViewById(R.id.autoComplete2);
acTextView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String selection = (String)parent.getItemAtPosition(position);
// city=(String)parent.getItemAtPosition(position);
city=acTextView.getText().toString();
}
});
myurl="http://103.75.33.98/BPService/GetAllBPService.svc/GetSalesPersonNo";
String res = new StringBuilder(14).append(myurl).append("/").append(username).append("/").append(password).toString();
String result=new StringBuilder(14).append(res).append("/").append(city).toString();
try {
url=new URL(result);
Log.d("url",url.toString());
} catch (MalformedURLException e) {
e.printStackTrace();
}
adapter = new
ArrayAdapter(this, android.R.layout.simple_list_item_1, salesPeName);
//acTextView.setAdapter(adapter);
new SalesTask().execute(city);
}
private class SalesTask extends AsyncTask<String,String,String> {
#Override
protected String doInBackground(String... params) {
try {
//url = new URL("http://103.75.33.98/BPService/GetAllBPService.svc/GetSalesPersonNo/"+username+"/"+password+"/"+city);
connection = (HttpURLConnection) url.openConnection();
Log.e("url reference value",url.toString());
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
String line = "";
Log.d("bufferData", buffer.toString());
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
String jsonString = buffer.toString();
// Log.e("Final Json that we have", jsonString);
JSONObject obj = null;
try {
obj = new JSONObject(jsonString);
JSONObject obj1 = obj.getJSONObject("GetBPSalesPersonResult");
JSONArray jArray = obj1.getJSONArray("BPResult");
for (int i = 0; i <= jArray.length(); i++) {
salesPeName.add(jArray.getJSONObject(i).getString("SALES_PERSON_NO"));
Log.e("Location",salesPeName.toString());
acTextView.setAdapter(adapter);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
Logcat is printing url as :
url: http://103.75.33.98/BPService/GetAllBPService.svc/GetSalesPersonNo/CBS/NOIDA/

Not sure if I understood your question correctly, but you are adding undeclared variables to the url. I think it should be:
URL url = new URL("http://103.75.33.98/BPService/GetAllBPService.svc/GetSalesPersonNo/"+cbs+"/"+city+"/"+saleP);

The problem is that you create the Url on in onCreate, at witch time city="", and you change the city in onItemClick: city=acTextView.getText().toString(), you need to generate the URL in onItemClick and call new SalesTask().execute(city); not right away
acTextView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String selection = (String)parent.getItemAtPosition(position);
city = acTextView.getText().toString();
url = new URL(new StringBuilder(myurl).append("/").append(username).append("/").append(password).append("/").append(city).toString());
new SalesTask().execute(city);
}
});

how can I run to background process at once

I' working on an app which among other things preforms a port scan. My problem is that I'm trying to implement a progress bar as the scan takes place. Right now I use AsynTask to perform the scan. But how can I update the progress bar while the scan is performing? Can I use the same AsynTask for both task or I need to implement a separate one. Any help appreciate!
PortScanActivity
package com.example.android.droidscanner;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Adapter;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.net.ConnectException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.SocketTimeoutException;
import java.net.UnknownHostException;
import java.util.ArrayList;
/**
* Created by jlvaz on 3/7/2017.
*/
public class PortScanActivity extends AppCompatActivity{
String ipAddress;
ArrayList<String> openPorts;
ArrayAdapter<String> portAdapter;
int startPort = 0;
int endPort = 1023;
TextView statusMsg;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.scan_list);
Intent portIntent = getIntent();
ipAddress = portIntent.getStringExtra("host");
statusMsg = (TextView) findViewById(R.id.status_msg);
//setting the adapter
ListView portList = (ListView) findViewById(R.id.scan_list);
openPorts = new ArrayList<>();
portAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, openPorts);
portList.setAdapter(portAdapter);
//scanning ports
PortScanTask portScan = new PortScanActivity.PortScanTask();
portScan.execute();
}
private class PortScanTask extends AsyncTask<Void, String, Void> {
int timeOut = 1000; //for how long try connection in ms
#Override
protected void onPreExecute() {
openPorts.clear();
statusMsg.setText("Scanning " + ipAddress + " ports..");
}
#Override
protected Void doInBackground(Void... params) {
for (int i = startPort; i <= endPort; i++) {
try {
//establishing connection to every port
Socket socket = new Socket();
SocketAddress address = new InetSocketAddress(ipAddress, i);
socket.connect(address, timeOut);
Log.v("Connecting to: ", ipAddress + i);
if (socket.isConnected()) {
socket.close();
publishProgress(ipAddress + ": " + i);
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketTimeoutException e) {
e.printStackTrace();
} catch (ConnectException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onProgressUpdate(String... values) {
openPorts.add(values[0]);
portAdapter.notifyDataSetInvalidated();
Toast.makeText(getApplicationContext(), values[0].toString() + " open!", Toast.LENGTH_SHORT).show();
}
#Override
protected void onPostExecute(Void aVoid) {
statusMsg.setText("Scan Complete!");
}
}
}

On progress update pass your custom class object which contains both, the string and the progress integer.
class ProgressStep {
int progress;
String address;
}
private class PortScanTask extends AsyncTask<Void, ProgressStep, Void> {
int timeOut = 1000; //for how long try connection in ms
#Override
protected void onPreExecute() {
openPorts.clear();
statusMsg.setText("Scanning " + ipAddress + " ports..");
}
#Override
protected Void doInBackground(Void... params) {
for (int i = startPort; i <= endPort; i++) {
try {
//establishing connection to every port
Socket socket = new Socket();
SocketAddress address = new InetSocketAddress(ipAddress, i);
socket.connect(address, timeOut);
Log.v("Connecting to: ", ipAddress + i);
int progress = count_your_progress;
ProgressStep step = new ProgressStep();
step.progress = progress;
if (socket.isConnected()) {
socket.close();
String address = ipAddress + ": " + i;
step.address = address;
}
publishProgress(step);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketTimeoutException e) {
e.printStackTrace();
} catch (ConnectException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onProgressUpdate(ProgressStep... values) {
ProgressStep step = values[0];
if (step.address != null) {
openPorts.add(step.address);
portAdapter.notifyDataSetInvalidated();
Toast.makeText(getApplicationContext(), step.address + " open!", Toast.LENGTH_SHORT).show();
}
progressBar.setProgress(step.progress);
}
#Override
protected void onPostExecute(Void aVoid) {
statusMsg.setText("Scan Complete!");
}
}

how can I implement the onProgressUpdate method in this AsynTask Class

I'm working on a network scanner, and for that I'm sending the scan to the background using an AsyncTask class. But I'm having problems implementing the onProgressUpdate() method. I'm passing an ArrayList of type string to the TaskScanNetwork class. This array will have a list of all life host on network. Any help appreciated. Thanks
package com.example.android.droidscanner;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.Array;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
Button btnRead;
Button btnScan;
TextView textResult;
ListView listViewNode;
ArrayList<Node> listNote;
ArrayList<String> listNetwork;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnRead = (Button)findViewById(R.id.readhost);
btnScan = (Button) findViewById(R.id.readnet);
textResult = (TextView)findViewById(R.id.result);
listViewNode = (ListView)findViewById(R.id.nodelist);
listNote = new ArrayList<>();
listNetwork = new ArrayList<>();
//initidating adapter for host only
ArrayAdapter<Node> adapterHost = new ArrayAdapter<Node>(
MainActivity.this,
android.R.layout.simple_list_item_1,
listNote);
listViewNode.setAdapter(adapterHost);
//initiating adapter for network scan
ArrayAdapter<String> adapterNetwork = new ArrayAdapter(
MainActivity.this,
android.R.layout.simple_list_item_1,
listNetwork);
listViewNode.setAdapter(adapterNetwork);
btnRead.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new TaskReadAddresses(listNote, listViewNode).execute();
}
});
btnRead.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new TaskScanNetwork(listNetwork, listViewNode).execute();
}
});
}
private class TaskReadAddresses extends AsyncTask<Void, Node, Void> {
ArrayList<Node> array;
ListView listView;
TaskReadAddresses(ArrayList<Node> array, ListView v){
listView = v;
this.array = array;
array.clear();
textResult.setText("querying...");
}
#Override
protected Void doInBackground(Void... params) {
readAddresses();
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
textResult.setText("Done");
}
#Override
protected void onProgressUpdate(Node... values) {
listNote.add(values[0]);
((ArrayAdapter)(listView.getAdapter())).notifyDataSetChanged();
}
private void readAddresses() {
BufferedReader bufferedReader = null;
try {
bufferedReader = new BufferedReader(new FileReader("/proc/net/arp"));
String line;
while ((line = bufferedReader.readLine()) != null) {
String[] splitted = line.split(" +");
if (splitted != null && splitted.length >= 4) {
String ip = splitted[0];
String mac = splitted[3];
if (mac.matches("..:..:..:..:..:..")) {
Node thisNode = new Node(ip, mac);
publishProgress(thisNode);
}
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally{
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/*
* Asynctask to scan the network
* */
private class TaskScanNetwork extends AsyncTask<Void, ArrayList<String>, Void> {
String network;
ListView listView;
String lowBoundIp;
ArrayList<String> allNetwork;
TaskScanNetwork(ArrayList<String> array, ListView v){
listView = v;
allNetwork = array;
textResult.setText("Scanning...");
}
#Override
protected Void doInBackground(Void... params) {
scanNetwork();
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
textResult.setText("Done");
}
#Override
protected void onProgressUpdate(ArrayList<String>... values) {
allNetwork.add(values);
((ArrayAdapter)(listView.getAdapter())).notifyDataSetChanged();
}
private void scanNetwork() {
try {
InetAddress localHost = InetAddress.getLocalHost();
lowBoundIp = localHost.getHostAddress();
int lastDot = lowBoundIp.lastIndexOf(".");
String host = lowBoundIp.substring(0, lastDot);
Process ping;
for(int i = 1; i < 255; i++) {
host = host + "." + Integer.toString(i);
try {
ping = Runtime.getRuntime().exec("ping -n 1 " + host);
int returnVal = ping.waitFor();
if(returnVal == 0) {
publishProgress(allNetwork);
}
}
catch(Exception ex) {
ex.printStackTrace();
}
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

my app doesn't add weather info to TextView (JSON)

I recently started learning JSON to use in my apps. I found a weather API (openweathermap.org) and used it on my app. the app runs fine but when I press Button, nothing happens. my source code:
import android.content.Context;
import android.hardware.input.InputManager;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import java.io.*;
import java.net.*;
import java.util.*;
import android.util.*;
import android.view.*;
import android.view.inputmethod.InputMethodManager;
import android.widget.*;
import org.json.*;
public class MainActivity extends AppCompatActivity {
EditText city;
TextView weather, description;
DownloadTask DownloadTask;
public void showWeather (View view)
{
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(city.getWindowToken(), 0);
try
{
String encodedCityName = URLEncoder.encode(city.getText().toString(), "UTF-8");
DownloadTask = new DownloadTask();
DownloadTask.execute("http://api.openweathermap.org/data/2.5/weather?q=" + encodedCityName + "&appid=812f300ec742971975bbde9a2e0ac0c1");
}
catch (UnsupportedEncodingException e)
{
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Error!", Toast.LENGTH_LONG).show();
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
city = (EditText) findViewById(R.id.city);
weather = (TextView) findViewById(R.id.weather);
description = (TextView) findViewById(R.id.description);
}
public class DownloadTask extends AsyncTask<String, Void, String>
{
#Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection connection = null;
try
{
url = new URL(urls[0]);
connection = (HttpURLConnection) url.openConnection();
InputStream in = connection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
int data = reader.read();
while (data != 1)
{
char current = (char) data;
result += current;
data = reader.read();
}
return result;
}
catch (Exception e)
{
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Error!", Toast.LENGTH_LONG);
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
Log.i("Weather content", result);
try
{
JSONObject jsonObject = new JSONObject(result);
String weatherInfo = jsonObject.getString("weather");
Log.i("Weather Content", weatherInfo);
JSONArray jsonArray = new JSONArray(weatherInfo);
String getMain = "";
String getDescription = "";
for (int i = 0; i < jsonArray.length(); i++)
{
JSONObject jsonPart = jsonArray.getJSONObject(i);
getMain = jsonPart.getString("main");
getDescription = jsonPart.getString("description");
Log.i("Main", getMain);
}
if (getMain != "" && getDescription != "")
{
weather.setText(getMain);
description.setText(getDescription);
}
}
catch (JSONException e)
{
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Error!", Toast.LENGTH_LONG);
}
}
}
}
none of Toasts and Logs work.

You have an error in reading the data. You should stop reading when getting -1 not 1.
while (data != -1)
{
char current = (char) data;
result += current;
data = reader.read();
}