I am currently populating a RrecyclerView from a remote database but wish to only query the database for dates based on a users ID. I have the userID assigned as a global variable on the LoginActivty of the app but I'm not sure where to pass that information to the php page from my DateActivity.
My Code for the DateActivity is as follows:
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
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 DateActivity extends AppCompatActivity {
public static String globex_num;
// CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
private RecyclerView mRVDateList;
private AdapterDate mAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_date);
//Make call to AsyncTask
new AsyncFetch().execute();
}
private class AsyncFetch extends AsyncTask<String, String, String> {
ProgressDialog pdLoading = new ProgressDialog(DateActivity.this);
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 {
url = new URL("thephpfile.com");
} 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<DataDate> data=new ArrayList<>();
pdLoading.dismiss();
try {
JSONArray jsonArray = new JSONArray(result);
// Extract data from json and store into ArrayList as class objects
for(int i=0;i<jsonArray.length();i++){
JSONObject json_data = jsonArray.getJSONObject(i);
DataDate dateData = new DataDate();
dateData.date= json_data.getString("date");
data.add(dateData);
}
// Setup and Handover data to recyclerview
mRVDateList = (RecyclerView)findViewById(R.id.dateList);
mAdapter = new AdapterDate(DateActivity.this, data);
mRVDateList.setAdapter(mAdapter);
mRVDateList.setLayoutManager(new LinearLayoutManager(DateActivity.this));
} catch (JSONException e) {
Toast.makeText(DateActivity.this, e.toString(), Toast.LENGTH_LONG).show();
}
}
}
}
I solved the problem by passing it though the link.
url = new URL(www.thephpfile.php?userID=" + LoginActivity.userID);
At the start of the php file I did the following:
$userID = $_GET['userID'];
Related
package com.example.webcontentdownload;
import androidx.appcompat.app.AppCompatActivity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
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.concurrent.ExecutionException;
public class MainActivity extends AppCompatActivity {
public class DownloadTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... strings) {
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(strings[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
int data = reader.read();
while(data != -1) {
char current = (char) data;
result += result;
data = reader.read();
}
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
return "Failed Malformed";
} catch (IOException e) {
e.printStackTrace();
return "Failed IOException";
}
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DownloadTask task = new DownloadTask();
String result = null;
try {
result = task.execute("https://www.google.com/").get();
Log.i("Contents of URL" , result);
} catch (ExecutionException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
**This is my code, I am trying to get the html code of any URL.
I have tried the url connection method. I tried to re-install the avd also, sometimes i get
Emulator: socketTcpLoopbackClientFor: error: fd 35124 above FD_SETSIZE (32768)
Emulator: emulator: ERROR: AdbHostServer.cpp:102: Unable to connect to adb daemon on port: 5037.
This is displayed in my EVENT LOG.
I would very much like your help **
The log I am getting is here.
I am writing a currency exchange android app however when the app is run I do not seem to get a response from the API.
API LINK 1) https://restcountries.eu/rest/v2/all
API LINK 2) http://api.fixer.io/latest
MainActivity Code:
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.Button;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
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 static java.lang.reflect.Modifier.FINAL;
public class MainActivity extends AppCompatActivity {
//Fill spinner with values from this URL - https://restcountries.eu/rest/v2/all
final String CURRENCY_DATA = "https://restcountries.eu/rest/v2/all";
ArrayList<String> currency_list = new ArrayList();
Button btn;
//The amount entered x's by the curreny exchange rate..
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new downloadData().execute();
new downloadExchangeRate().execute();
}
});
}
public class downloadData extends AsyncTask<String, Void, String> {
String result = "";
#Override
protected String doInBackground(String... strings) {
try {
URL url = new URL(CURRENCY_DATA);
HttpURLConnection httpURLConnection= (HttpURLConnection) url.openConnection();
httpURLConnection.connect();
InputStream inputStream = httpURLConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
int data = inputStreamReader.read();
while (data != -1) {
char current = (char) data;
result += current;
data = inputStreamReader.read();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
#Override
protected void onPostExecute(String s) {
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray jsonArray = jsonObject.getJSONArray("currencies");
for (int i =0; i<jsonArray.length(); i++){
currency_list.add(jsonArray.getJSONObject(i).optString("code"));
Log.d("list", currency_list.toString());
}
} catch (JSONException e) {
e.printStackTrace();
}
super.onPostExecute(s);
}
}
}
downloadExchangeRate.java code:
import android.os.AsyncTask;
import android.util.Log;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
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;
public class downloadExchangeRate extends AsyncTask<String,Void,String> {
String result = "";
#Override
protected String doInBackground(String... strings) {
final String EXCHANGE_RATE = "http://api.fixer.io/latest";
try {
URL url = new URL(EXCHANGE_RATE);
HttpURLConnection httpURLConnection= (HttpURLConnection) url.openConnection();
httpURLConnection.connect();
InputStream inputStream = httpURLConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
int data = inputStreamReader.read();
while (data != -1) {
char current = (char) data;
result += current;
data = inputStreamReader.read();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
#Override
protected void onPostExecute(String s) {
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(result);
for (int i = 0; i<jsonObject.length(); i++){
ArrayList<String> rates = new ArrayList<>();
rates.add(jsonObject.optString("rates"));
Log.d("list", rates.toString());
}
} catch (JSONException e) {
e.printStackTrace();
}
super.onPostExecute(s);
}
}
Any help is appreciated, I think I am calling the JSON wrong.
Update Code as:
Use StringBuilder for result (Why? See this https://stackoverflow.com/a/14927864/5227589):
StringBuilder result=new StringBuilder();
...
......
result.append(current);
When using String it will take very long time to complete while loop due to use of result += current;: .
When using StringBuilder:
In onPostExecute
JSONArray jsonArray = new JSONArray(result.toString());
for (int i =0; i<jsonArray.length(); i++){
currency_list.add(jsonArray.getJSONObject(i).getJSONArray("currencies").getJSONObject(0).optString("code"));
//Log.d("list", currency_list.toString());
}
Full Code:
public class downloadData extends AsyncTask<String, Void, String> {
StringBuilder result=new StringBuilder();
#Override
protected String doInBackground(String... strings) {
try {
URL url = new URL(CURRENCY_DATA);
HttpURLConnection httpURLConnection= (HttpURLConnection) url.openConnection();
httpURLConnection.connect();
InputStream inputStream = httpURLConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
int data = inputStreamReader.read();
char current = (char) data;
Log.i("data",current+"");
while (data != -1) {
current = (char) data;
result.append(current);
data = inputStreamReader.read();
// Log.i("data",current+"");
}
//Log.i("data",result+"");
} catch (IOException e) {
e.printStackTrace();
}
return result.toString();
}
#Override
protected void onPostExecute(String s) {
try {
JSONArray jsonArray = new JSONArray(result.toString());
for (int i =0; i<jsonArray.length(); i++){
currency_list.add(jsonArray.getJSONObject(i).getJSONArray("currencies").getJSONObject(0).optString("code"));
//Log.d("list", currency_list.toString());
}
Log.d("list", currency_list.toString());
} catch (JSONException e) {
e.printStackTrace();
}
super.onPostExecute(s);
}
}
I have the following code working for any sample URL with a JSON
package com.example.carlos.jsoninputurl;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.example.carlos.jsoninputurl.R;
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;
public class MainActivity extends AppCompatActivity {
Button btnHit;
TextView txtJson;
ProgressDialog pd;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnHit = (Button) findViewById(R.id.btnHit);
txtJson = (TextView) findViewById(R.id.tvJsonItem);
btnHit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new JsonTask().execute("https://10.109.143.88:8443/getsensorvalues/2741025");
//working url: http://validate.jsontest.com/?json=%7B%22key%22:%22value%22%7D
//not working url: https://10.109.143.88:8443/getsensorvalues/2741025
}
});
}
private class JsonTask extends AsyncTask<String, String, String> {
protected void onPreExecute() {
super.onPreExecute();
pd = new ProgressDialog(MainActivity.this);
pd.setMessage("Please wait");
pd.setCancelable(false);
pd.show();
}
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuilder buffer = new StringBuilder();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line).append("\n");
Log.d("Response: ", "> " + line); //here u ll get whole response...... :-)
}
return buffer.toString();
} catch (MalformedURLException e) {
Log.e("JSON Parser", "Error due to a malformed URL " + e.toString());
e.printStackTrace();
} catch (IOException e) {
Log.e("JSON Parser", "IO error " + e.toString());
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
Log.e("JSON Parser", "IO error " + e.toString());
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (pd.isShowing()){
pd.dismiss();
}
txtJson.setText(result);
}
}
}
the URL from JSON placeholder website works as I want, it shows the the following output on a textview.
{
"object_or_array": "object",
"empty": false,
"parse_time_nanoseconds": 13932,
"validate": true,
"size": 1
}
But when I try the other website, it doesn't show anything.
Since it is a private IP I am connected to the VPN.
Going to the URL in web browser gives the following output:
{"requestResult":"SUCCESS","values":[{"variableName":"Temperature","value":{"value":99.0,"timeStamp":"10.06.2017 11:10 PM"}},{"variableName":"Pressure","value":{"value":99.0,"timeStamp":"10.06.2017 11:03 PM"}},{"variableName":"Humidity","value":null}],"pantherId":2741025}
Accessing the website through the VPN does give a certificate error, but it is a trusted school URL for testing a sensor app.
Any suggestion on how to modify the code to be able to get the json response working on the app?
i am just a beginner in developing android applications, i wanted to connect my application to a server so i could get data from MySQL. so i tried to make login part first but i have some problems. my code doesn't work for reading JSON.
my codes are as below:
LoginActivity(MainActivity) :
package ir.naserpour.sportclub;
import android.content.Context;
import android.graphics.Typeface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.UnsupportedEncodingException;
import uk.co.chrisjenx.calligraphy.CalligraphyContextWrapper;
public class LoginActivity extends AppCompatActivity {
String link;
String response;
//get values
String username,password;
#Override
protected void attachBaseContext (Context newBase){
super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}
#Override
protected void onCreate (Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
//define things
TextView menu = (TextView) findViewById(R.id.menu);
final EditText login_username = (EditText) findViewById(R.id.login_username);
final EditText login_password = (EditText) findViewById(R.id.login_password);
Button login_login = (Button) findViewById(R.id.login_login);
Button login_register = (Button)findViewById(R.id.login_register);
CheckBox rememberme = (CheckBox)findViewById(R.id.login_remeberme);
//set icon type face
Typeface fonticon = Typeface.createFromAsset(getAssets(), "fonts/icon.ttf");
menu.setTypeface(fonticon);
login_login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
username = login_username.getText().toString();
password = login_password.getText().toString();
//check values
if (username.length() <1 || password.length() < 1) {
Toast.makeText(getApplicationContext(), "fields cannot be empty", Toast.LENGTH_SHORT).show();
} else {
//generate link
link = "http://localhost:8080/login.php?username="+username+"&password="+password;
login();
if(response=="true"){
Toast.makeText(getApplicationContext(), "true", Toast.LENGTH_SHORT).show();
}else if(response=="false"){
Toast.makeText(getApplicationContext(), "false", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(getApplicationContext(), "response", Toast.LENGTH_SHORT).show();
}
}
}
});
}
#Override
protected void onPause () {
super.onPause();
finish();
}
public String login() {
new JSONParse().execute();
return response;
}
public class JSONParse extends AsyncTask<String, String, JSONObject> {
#Override
public void onPreExecute() {
super.onPreExecute();
Toast.makeText(getApplicationContext(),"getting data ...",Toast.LENGTH_SHORT).show();
}
#Override
public JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(link);
return json;
}
#Override
public void onPostExecute(JSONObject json) {
try {
JSONArray result = json.getJSONArray("result");
JSONObject c = result.getJSONObject(0);
try {
String res = new String(c.getString("response").getBytes("ISO-8859-1"), "UTF-8");
response = res;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
JSONParser.java:
package ir.naserpour.sportclub;
import android.util.Log;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
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.io.UnsupportedEncodingException;
/**
* Created by Mohammad Naserpour on 9/22/2016.
*/
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httppost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
and also my login.php script:
<?php
define("HOST","localhost");
define("USERNAME","root");
define("PASSWORD","");
define("NAME","users");
$con = mysqli_connect(HOST,USERNAME,PASSWORD,NAME);
$username = $_GET["username"];
$password = $_GET["password"];
$sql = "SELECT * FROM userinfo WHERE username ='$username' AND password='$password'";
$check = mysqli_fetch_array(mysqli_query($con,$sql));
if(isset($check)){
echo '{"result":[{"response":"true"}]}';
}else{
echo '{"result":[{"response":"false"}]}';
}
mysqli_close($con);
?>
i would be so happy if i find out the problem. thank you.
see this tutorial :
its a full tutorial about login process using google volley
First : On device side, Use volley, its simple and easy to use
Second : On server, what is {"result":[{"response":"true"}]}
any problem with {"result":true} ??
Last but not the least : Did you use JSON before or this code is trial and error copy paste from some tutorials?
I could retreive data from web with this code:
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
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;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onClick (View v){
new GetMethodDemo().execute("https://maps.googleapis.com/maps/api/directions/json?origin=Breclav&destination=Brno&sensor=false&units=metric&mode=driving");
}
public class GetMethodDemo extends AsyncTask<String , Void ,String> {
String server_response;
#Override
protected String doInBackground(String... strings) {
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(strings[0]);
urlConnection = (HttpURLConnection) url.openConnection();
int responseCode = urlConnection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
server_response = readStream(urlConnection.getInputStream());
Log.v("CatalogClient", server_response);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Log.e("Response", "" + server_response);
}
}
private String readStream(InputStream in) {
BufferedReader reader = null;
StringBuffer response = new StringBuffer();
try {
reader = new BufferedReader(new InputStreamReader(in));
String line = "";
while ((line = reader.readLine()) != null) {
response.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return response.toString();
} }
I am able to see in debug that I received data like in this link, but I found that I should use code below for selecting only distance from the data I received. Dont know how to combinate these codes together.. I would like to have in textView how far is the distance between two cities from url.
final JSONObject json = new JSONObject(response);
JSONArray routeArray = json.getJSONArray("routes");
JSONObject routes = routeArray.getJSONObject(0);
JSONArray newTempARr = routes.getJSONArray("legs");
JSONObject newDisTimeOb = newTempARr.getJSONObject(0);
JSONObject distOb = newDisTimeOb.getJSONObject("distance");
JSONObject timeOb = newDisTimeOb.getJSONObject("duration");
Log.i("Diatance :", distOb.getString("text"));
Log.i("Time :", timeOb.getString("text"));
I am not the author of these codes... Thank You