I tried to connect my android app to SQL DB using JDBC connector. If I try it in Netbeans, so it's OK and the connection is working. I am using connector: mssql-jdbc-8.2.2.jre13
package sql_server;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class Sql_server {
public static void main(String[] args) {
String url = "jdbc:sqlserver://localhost\\MSSQLSERVER19;databaseName=Helios002";
String user = "user";
String password = "password";
String query = "select top 1 skupzbo, regcis, nazev1 from Tabkmenzbozi order by id desc";
try ( Connection con = DriverManager.getConnection(url, user, password); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(query)) {
if (rs.next()) {
System.out.println(rs.getString(1) + rs.getString(2) + rs.getString(3));
}
} catch (SQLException ex) {
System.out.println("An error occurred while connecting MySQL databse");
ex.printStackTrace();
}
}
}
But in android studio it's not working.I am using connector:mssql-jdbc-8.2.2.jre11, because mssql-jdbc-8.2.2.jre13 is not supported by android studio.
package com.example.hepopr.ui.gallery;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;
import com.example.hepopr.R;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Objects;
import java.util.Timer;
import java.util.TimerTask;
public class GalleryFragment extends Fragment {
private TextView test;
public static String url = "jdbc:sqlserver://localhost\\MSSQLSERVER19;databaseName=Helios002";
public static final String user = "user";
public static final String pass = "password";
private GalleryViewModel galleryViewModel;
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
galleryViewModel =
ViewModelProviders.of( this ).get( GalleryViewModel.class );
View root = inflater.inflate( R.layout.fragment_gallery, container, false );
final TextView textView = root.findViewById( R.id.text_gallery );
galleryViewModel.getText().observe( getViewLifecycleOwner(), new Observer<String>() {
#Override
public void onChanged(#Nullable String s) {
textView.setText( s );
}
} );
test=root.findViewById( R.id.textView2 );
return root;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate( savedInstanceState );
Timer timer = new Timer();
//Set the schedule function
timer.scheduleAtFixedRate( new TimerTask() {
#Override
public void run() {
new MyTask().execute();
}
},0, 30000 ); // 1000 Millisecond = 1 second
}
private class MyTask extends AsyncTask<Void, Void, Void> {
private String STvody = "", STvzduchu = "", SVlhkost = "", SCerpadlo = "", SHladina = "", SSvetlo = "", SDate = "", STlak = "";
#Override
protected Void doInBackground(Void... arg0) {
try {
Class.forName( "com.microsoft.sqlserver.jdbc.SQLServerDriver" );
Connection con = DriverManager.getConnection( url, user,pass);
if (con == null) {
Toast.makeText( getActivity(), "Nepřipojeno", Toast.LENGTH_SHORT ).show();
} else {
Statement st = con.createStatement();
String sql = "select top 1 regcis from Tabkmenzbozi order by id desc ";
final ResultSet rs = st.executeQuery( sql );
if (rs == null) {
Toast.makeText( getActivity(), "Bez dat", Toast.LENGTH_SHORT ).show();
}
Objects.requireNonNull( rs ).next();
SDate = rs.getString( 1 );
String pattern = "HH:mm:ss";
DateFormat df = new SimpleDateFormat(pattern);
Date today = Calendar.getInstance().getTime();
// todayAsString = df.format( today );
con.close();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
test.setText( SDate );
super.onPostExecute( result );
}
}
}
And studio returns an error:
W/System.err: com.microsoft.sqlserver.jdbc.SQLServerException: The connection to the host localhost, named instance mssqlserver19 failed. Error: "java.net.SocketTimeoutException: Poll timed out". Verify the server and instance names and check that no firewall is blocking UDP traffic to port 1434. For SQL Server 2005 or later, verify that the SQL Server Browser Service is running on the host.
W/System.err: at com.microsoft.sqlserver.jdbc.SQLServerConnection.getInstancePort(SQLServerConnection.java:6068)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.primaryPermissionCheck(SQLServerConnection.java:2457)
W/System.err: at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:2200)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectInternal(SQLServerConnection.java:2067)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:1204)
W/System.err: at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:825)
at java.sql.DriverManager.getConnection(DriverManager.java:569)
at java.sql.DriverManager.getConnection(DriverManager.java:219)
W/System.err: at com.example.hepopr.ui.gallery.GalleryFragment$MyTask.doInBackground(GalleryFragment.java:84)
at com.example.hepopr.ui.gallery.GalleryFragment$MyTask.doInBackground(GalleryFragment.java:76)
W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:764)
Can you help me, what wrong is?
Thank you.
Don't do this. Ever. Your db password is in your code, which is going out to devices. That means with 30 minutes of effort anyone can get your db password and screw with your data. You should only ever interact with a remote db through a webservice, so only the webservice (on your hardware) has the keys to your database. Anything else is incredibly insecure.
JDBC can be used server side securely because its only run on your server. But it should never be used on devices you don't physically control.
Related
package com.example.workdb;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.os.AsyncTask;
import android.os.StrictMode;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.os.Bundle;
import android.widget.TextView;
import org.w3c.dom.Text;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import net.sourceforge.jtds.jdbc.*;
public class MainActivity extends AppCompatActivity {
public Button run;
public TextView message;
public TextView txtvw;
public Connection con;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
run= (Button) findViewById(R.id.button);
run.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
CheckLogin checkLogin= new CheckLogin();
checkLogin.execute("");
Log.d("CREATION","ON CREATE WORKS");
// Log.d("txtvw", connection);
//System.out.println("Yes");
// txtvw.setText("hello");
}
});
} public class CheckLogin extends AsyncTask<String,String,String>
{
String z="";
Boolean IsSuccess= false;
String name1="";
// Log.d("txtvw","step 1 done");
protected void onPostExecute(String r){
if (IsSuccess){
message=(TextView)findViewById(R.id.textView);
message.setText(name1);
Log.d("TAG", "STEP 1 DONE");
}
}
#Override
protected String doInBackground(String... strings) {
try
{
Connection con = connectionClass();
if(con==null){
z="Check interent";
//Log.d("txtvw", z);
}
else
{
String query= "select * from Value";
Statement stmt= con.createStatement();
ResultSet rs= stmt.executeQuery(query);
if (rs.next())
{
name1=rs.getString("KneeAngle");
Log.d("MYTAG", "name 1 works");
z="Query success";
IsSuccess=true;
con.close();
}
else{
z="Invalid query";
IsSuccess=false;
}
}
} catch (SQLException e) {
e.printStackTrace();
}
return z;
}
}
public Connection connectionClass(){
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
Connection connection = null;
String ConnectionURL ;
try{
Class.forName("net.sourceforge.jtds.jdbs.Driver");
ConnectionURL="jdbc:jtds:sqlserver://havvasemserv3.database.windows.net:1433;DatbaseName=Newfin;user=;password=;encrypt=true;trustServerCertificate=false;hostNameInCertificate=*.database.windows.net;loginTimeout=30";
connection= DriverManager.getConnection(ConnectionURL);
} catch(ClassNotFoundException e){
Log.e("Error here 2 ",e.getMessage());
}
catch (Exception e) {
Log.e("error here 3:",e.getMessage());
}
//Log.d("txtvw", connection);
return connection;
}
}
I am trying to connect azure sql database to android studio. I have added all the permissions in the manifest file and I have also added a jtds module 1.3.1 in the project and implemented it in the gradle module app. My code exits with 0 errors but data is not displayed on the emulator. Expected output is the first value from my database which is "8".
Thanks.,
Add this at the end of you current connection url after timeout=30
;ssl=request
Also make sure in your firewall settings of your azure server!/database your current device ip is allowed to access as by default all access is blocked,
To allow all devices to access server go to the firewall settings and in the insert ip section add this ip range
0,0,0,0 and 255,255,255,255
i am currently developping an application for my third year project, it's an android app (i used android studio) that will access a database that i created on my wamp server, the connection works perfectly from the application when i debug it on my android phone( i used in my code the "HttpURLConnection" with the url being my pc ip adress that i got from (cmd/ipconfig) ) .
The problem is that once i disconnect my phone from my pc and try to run the application from the phone, the connection with the database won't work, and also if i connect my pc to another modem, my pc ip changes, which is pretty much normal, but i don't think supposed to change the ip everytime the modem i connect to change ( although i'm not really sure, server connexions are clearly not something i'm an expert at ) , so i tried to use the ip of my pc on the internet that i got from "ipaddress.com" but it won't work, not even if i debug the application directly from android studio,
i don't have much time left to present the application , so i need a quick answer, thank you in advance
P.S : i guess i gotta mention that i need to acces the database to read AND write on it from the phone since it's an app that permits login/registration and will get the data that the user will enter and store it in the database .
I don't know wheter understanded, when you disconnect your phone from your pc, the app dead? or simplely it don't connect with db. Regard router, you need an account in "no-ip" and configure forguard's router on port 80 to redirect your computer's static IP. i need more details and information to help you. Regards
Try to connect the Phone and Mobile in same network.
your connection Url would be Like this 192.10.20.2 which is your ip or computer. as your get it form cmd using ipconfig command.
but whenever your networks changes your have to decompile to change the ip. or provide ip via textview.
take a Editview to take ip. and the concat it to your url. this will work. as it worked for me.
i'm working on an external server
The php code (for the connection to the db)
<?php
$db_name="pfe";
$mysql_username="root";
$mysql_password="";
$server_name="localhost";
$conn = mysqli_connect($server_name,$mysql_username,$mysql_password,$db_name);
?>
then i got another php file which handles the login part
<?php
require "connexion.php";
$user_email =$_POST["user-email"];
$user_pass =$_POST["password"];
$mysql_qry = "select id from donateur where email like '$user_email' and
password like '$user_pass'";
$result = mysqli_query($conn , $mysql_qry);
if(($row=mysqli_fetch_assoc($result))!=null){
$a = array('myarray' => array("donateur", $row["id"]));
echo json_encode($a);}
else {
$mysql_qry2 = "select id, username from association where email like
'$user_email' and password like '$user_pass'";
$result2 = mysqli_query($conn , $mysql_qry2);
if(($row=mysqli_fetch_assoc($result2))!=null) { $a = array('myarray' =>
array("association", $row["id"]));
echo json_encode($a);
}
else { echo "rien";}}
$conn->close();
the java code :
package applis.pfe;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.CursorLoader;
import android.content.Loader;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static android.Manifest.permission.READ_CONTACTS;
public class LoginActivity extends AppCompatActivity implements
LoaderCallbacks<Cursor> {
/**
* Id to identity READ_CONTACTS permission request.
*/
private static final int REQUEST_READ_CONTACTS = 0;
DonateurDAO donateurdao= new DonateurDAO(this);
AssociationDAO associationdao=new AssociationDAO(this);
/**
* Keep track of the login task to ensure we can cancel it if requested.
*/
String ip="http://105.101.179.155/";
private UserLoginTask mAuthTask = null;
// UI references.
private AutoCompleteTextView mEmailView;
private EditText mPasswordView;
private View mProgressView;
private View mLoginFormView;
public static String qui;
public static int id;
public static String username;
SessionManager session;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
///////////////////// POUR AFFICHER LE MESSAGE DIINSCRIPTION REUSSIE /////////////////////////////////////
if(getIntent().getStringExtra("inscription")!=null &&
getIntent().getStringExtra("inscription").equals("oui"))
{ AlertDialog a= new AlertDialog.Builder(LoginActivity.this).create();
a.setTitle("Inscription réussie !");
a.setMessage("Votre inscription a été validé, veuillez vous connecter
pour pouvoir continuer");
a.show();}
session = new SessionManager(this);
// Set up the login form.
mEmailView = (AutoCompleteTextView) findViewById(R.id.email);
// populateAutoComplete();
mPasswordView = (EditText) findViewById(R.id.password);
mPasswordView.setOnEditorActionListener(new
TextView.OnEditorActionListener() {
#Override
public boolean onEditorAction(TextView textView, int id, KeyEvent
keyEvent) {
if (id == R.id.login || id == EditorInfo.IME_NULL) {
attemptLogin();
return true;
}
return false;
}
});
Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);
mEmailSignInButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {attemptLogin();
}
});
mLoginFormView = findViewById(R.id.login_form);
mProgressView = findViewById(R.id.login_progress);
ImageButton btn;
btn =(ImageButton)findViewById(R.id.InscriptionDonateurButton);
btn.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {Intent in= new
Intent(LoginActivity.this,InscriptionDonateurActivity.class);
startActivity(in);
}
});
ImageButton btn1;
btn1 =(ImageButton)findViewById(R.id.InscriptionAssociationButton);
btn1.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {Intent in= new
Intent(LoginActivity.this,InscriptionAssociationActivity.class);
startActivity(in);
}
});
}
private void attemptLogin() {
if (mAuthTask != null) {
return;
}
// Reset errors.
mEmailView.setError(null);
mPasswordView.setError(null);
// Store values at the time of the login attempt.
String email = mEmailView.getText().toString();
String password = mPasswordView.getText().toString();
boolean cancel = false;
View focusView = null;
// Check for a valid password, if the user entered one.
if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {
mPasswordView.setError(getString(R.string.error_invalid_password));
focusView = mPasswordView;
cancel = true;
}
// Check for a valid email address.
if (TextUtils.isEmpty(email)) {
mEmailView.setError(getString(R.string.error_field_required));
focusView = mEmailView;
cancel = true;
} else if (!isEmailValid(email)) {
mEmailView.setError(getString(R.string.error_invalid_email));
focusView = mEmailView;
cancel = true;
}
if (cancel) {
// There was an error; don't attempt login and focus the first
// form field with an error.
focusView.requestFocus();
} else {
// Show a progress spinner, and kick off a background task to
// perform the user login attempt.
showProgress(true);
mAuthTask = new UserLoginTask(email, password);
mAuthTask.execute((Void) null);
}
}
private boolean isEmailValid(String email) {
//TODO: Replace this with your own logic
return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches();
}
private boolean isPasswordValid(String password) {
//TODO: Replace this with your own logic
return password.length() > 4;
}
/**
* Shows the progress UI and hides the login form.
*/
#TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
private void showProgress(final boolean show) {
// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
// for very easy animations. If available, use these APIs to fade-in
// the progress spinner.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
mLoginFormView.animate().setDuration(shortAnimTime).alpha(
show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
}
});
mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
mProgressView.animate().setDuration(shortAnimTime).alpha(
show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
}
});
} else {
// The ViewPropertyAnimator APIs are not available, so simply show
// and hide the relevant UI components.
mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
}
}
#Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
return new CursorLoader(this,
// Retrieve data rows for the device user's 'profile' contact.
Uri.withAppendedPath(ContactsContract.Profile.CONTENT_URI,
ContactsContract.Contacts.Data.CONTENT_DIRECTORY), ProfileQuery.PROJECTION,
// Select only email addresses.
ContactsContract.Contacts.Data.MIMETYPE +
" = ?", new String[]{ContactsContract.CommonDataKinds.Email
.CONTENT_ITEM_TYPE},
// Show primary email addresses first. Note that there won't be
// a primary email address if the user hasn't specified one.
ContactsContract.Contacts.Data.IS_PRIMARY + " DESC");
}
#Override
public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
List<String> emails = new ArrayList<>();
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
emails.add(cursor.getString(ProfileQuery.ADDRESS));
cursor.moveToNext();
}
addEmailsToAutoComplete(emails);
}
#Override
public void onLoaderReset(Loader<Cursor> cursorLoader) {
}
private void addEmailsToAutoComplete(List<String> emailAddressCollection) {
//Create adapter to tell the AutoCompleteTextView what to show in its dropdown list.
ArrayAdapter<String> adapter =
new ArrayAdapter<>(LoginActivity.this,
android.R.layout.simple_dropdown_item_1line, emailAddressCollection);
mEmailView.setAdapter(adapter);
}
private interface ProfileQuery {
String[] PROJECTION = {
ContactsContract.CommonDataKinds.Email.ADDRESS,
ContactsContract.CommonDataKinds.Email.IS_PRIMARY,
};
int ADDRESS = 0;
int IS_PRIMARY = 1;
}
/**
* Represents an asynchronous login/registration task used to authenticate
* the user.
*/
public class UserLoginTask extends AsyncTask<Void, Void, String> {
private final String mEmail;
private final String mPassword;
UserLoginTask(String email, String password) {
mEmail = email;
mPassword = password;
}
#Override
protected String doInBackground(Void... params) {
// TODO: attempt authentication against a network service.
String login_url= ip.concat("login.php");
try {
URL url= new URL(login_url);
HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
OutputStream outputStream= httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter= new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
String Post_data= URLEncoder.encode("user-email","UTF-8")+"="+URLEncoder.encode(mEmail,"UTF-8")+"&"
+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(mPassword,"UTF-8");
bufferedWriter.write(Post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream=httpURLConnection.getInputStream();
qui=null;
id=0;
BufferedReader bufferedReader= new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
String resultat="";
String ligne="";
while((ligne=bufferedReader.readLine())!=null)
resultat += ligne;
if (resultat.equals("rien")) return resultat; else {
JSONObject jsonObject = new JSONObject(resultat);
JSONArray json_data = jsonObject.getJSONArray("myarray");
qui=json_data.getString(0);
id=json_data.getInt(1);
username= json_data.getString(2);}
/* for(int i=0;i<json_data.length();i++)
{
k++;
qui= json_data.getString(1);
id= json_data.getInt(2);
//r.add(json_data.getString("categorie"));
}*/
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return resultat;
} catch (MalformedURLException e) {
e.printStackTrace();return e.toString();
} catch (IOException e) {
e.printStackTrace();return e.toString();
} catch (JSONException e) {
e.printStackTrace(); return e.toString();
}
}
/* for (String credential : DUMMY_CREDENTIALS) {
String[] pieces = credential.split(":");
if (pieces[0].equals(mEmail)) {
// Account exists, return true if the password matches.
return pieces[1].equals(mPassword);
}
}*/
// TODO: register the new account here.
#Override
protected void onPostExecute(String resultat) {
mAuthTask = null;
showProgress(false);
/////////////////////////////////////////////////////////////////////////////////
Intent i;
AlertDialog a;
if (resultat.equals("rien")){i= new Intent(LoginActivity.this,LoginActivity.class);
a= new AlertDialog.Builder(LoginActivity.this).create();
a.setTitle("Erreur");
a.setMessage(" Email et/ou mot de passe erroné(s)");
a.show();} else {
try {
session.createLoginSession(mEmail,username,qui,id);
session.checkLogin();
if (qui.equals("donateur")) {
i = new Intent(LoginActivity.this, Suite_Inscription_Donateur.class);
i.putExtra("id", id);
startActivity(i);
} else if (qui.equals("association")) {
session.createLoginSession(mEmail,username,qui,id);
i = new Intent(LoginActivity.this, Suite_Inscription_Association.class);
i.putExtra("id", id);
startActivity(i);
}
} catch (Exception e) {
e.printStackTrace();
a= new AlertDialog.Builder(LoginActivity.this).create();
a.setTitle("Erreur");
a.setMessage("Erreur :".concat(e.toString()));
a.show();
}
}
#Override
protected void onCancelled() {
mAuthTask = null;
showProgress(false);
}
}
}
I am getting x and y values from a JSON and creating graph using GraphView. How to implement X-axis as Dates.I am sharing my code, please see what is the mistake?
Here's my code :
import android.graphics.Color;
import android.icu.text.SimpleDateFormat;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.w3c.dom.Text;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import android.view.Menu;
import android.view.MenuItem;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.appindexing.Thing;
import com.google.android.gms.common.api.GoogleApiClient;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.Viewport;
import com.jjoe64.graphview.helper.DateAsXAxisLabelFormatter;
import com.jjoe64.graphview.helper.StaticLabelsFormatter;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.DataPointInterface;
import com.jjoe64.graphview.series.LineGraphSeries;
import com.jjoe64.graphview.series.OnDataPointTapListener;
import com.jjoe64.graphview.series.Series;
import java.security.Timestamp;
import java.sql.Time;
import java.text.ParseException;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.HashMap;
import java.util.ArrayList;
import java.lang.Double;
import java.util.Map;
import java.util.Random;
import garima.asynctask.library.HttpHandler;
import static com.example.garima.bitcoingraph.sortedHashMap.sortByValues;
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
//URL to get JSON Array
private static String url = "https://api.blockchain.info/charts/market-price?format=json";
HashMap<String, String> valueslist;
//JSON Node Names
private static final String TAG_STATUS = "status";
private static final String TAG_NAME = "name";
private static final String TAG_UNIT = "unit";
private static final String TAG_PERIOD = "period";
private static final String TAG_DESCRIPTION = "description";
private LineGraphSeries<DataPoint> series;
//On the click of this Get Data Button we receive information from json
Button Btngetdata;
JSONArray user = null;
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GraphView graph = (GraphView) findViewById(R.id.graph);
series = new LineGraphSeries<DataPoint>();
graph.addSeries(series);
series.setThickness(8);
series.setDrawDataPoints(true);
series.setOnDataPointTapListener(new OnDataPointTapListener() {
#Override
public void onTap(Series series, DataPointInterface dataPoint) {
Toast.makeText(MainActivity.this,"On Data Point clicked:"+dataPoint, Toast.LENGTH_SHORT).show();
}
});
//StaticLabelsFormatter staticLabelsFormatter = new StaticLabelsFormatter(graph);
//staticLabelsFormatter.setHorizontalLabels(new String[] { "Feb'16", "Mar'16","April'16","May'16","June'16","July'16","Aug'16","Sep'16","Oct'16","Nov'16","Dec'16","Jan'17"});
//graph.getGridLabelRenderer().setLabelFormatter(staticLabelsFormatter);
graph.getGridLabelRenderer().setLabelFormatter(new DateAsXAxisLabelFormatter(MainActivity.this));
//graph.getGridLabelRenderer().setNumHorizontalLabels(30); // only 4 because of the space
graph.getGridLabelRenderer().setHumanRounding(false);
Viewport viewport = graph.getViewport();
viewport.setYAxisBoundsManual(true);
viewport.setMinY(0);
viewport.setMaxY(1200);
viewport.setScalable(true);
viewport.setScrollable(true);
viewport.setScalableY(true);
viewport.setScrollableY(true);
//viewport.setXAxisBoundsManual(true);
valueslist = new HashMap<>();
Btngetdata = (Button) findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new JSONParse().execute();
}
});
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
#RequiresApi(api = Build.VERSION_CODES.N)
private void addEntry(String Xax, String Yax) {
//int Xaxis_val = Integer.parseInt(Xax);
//Log.i(TAG, "addEntry: value of Xaxis val is" + Xaxis_val);
float Yaxis_val = Float.parseFloat(Yax);
Log.i(TAG, "addEntry: value of Y axis is " + Yaxis_val);
Date date= new Date();
SimpleDateFormat fmtOut = new SimpleDateFormat("dd/MM/yyyy");
try {
date=fmtOut.parse(Xax);
} catch (ParseException e) {
e.printStackTrace();
}
Log.i(TAG, "addEntry: date as x is"+date);
series.appendData(new DataPoint(date, Yaxis_val), true, 200);
}
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
public Action getIndexApiAction() {
Thing object = new Thing.Builder()
.setName("Main Page") // TODO: Define a title for the content shown.
// TODO: Make sure this auto-generated URL is correct.
.setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]"))
.build();
return new Action.Builder(Action.TYPE_VIEW)
.setObject(object)
.setActionStatus(Action.STATUS_TYPE_COMPLETED)
.build();
}
#Override
public void onStart() {
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client.connect();
AppIndex.AppIndexApi.start(client, getIndexApiAction());
}
#Override
public void onStop() {
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
AppIndex.AppIndexApi.end(client, getIndexApiAction());
client.disconnect();
}
private class JSONParse extends AsyncTask<Void, Void, Void> {
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
String Status_Value = jsonObj.getString(TAG_STATUS);
String Name_Value = jsonObj.getString(TAG_NAME);
String Unit_Value = jsonObj.getString(TAG_UNIT);
String Period_Value = jsonObj.getString(TAG_PERIOD);
String Description_Value = jsonObj.getString(TAG_DESCRIPTION);
// Getting JSON Array node
JSONArray values = jsonObj.getJSONArray("values");
// looping through All Values
for (int i = 0; i < values.length(); i++) {
JSONObject c = values.getJSONObject(i);
String x_val = c.getString("x");
String y_val = c.getString("y");
// tmp hash map for single value
HashMap<String, String> val = new HashMap<>();
// adding each child node to HashMap key => value
val.put("x", x_val);
val.put("y", y_val);
// adding values to values list
valueslist.put(x_val, y_val);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
#RequiresApi(api = Build.VERSION_CODES.N)
#Override
protected void onPostExecute(Void Result) {
pDialog.dismiss();
/* ListAdapter adapter = new SimpleAdapter(
MainActivity.this, valueslist,
R.layout.list_item, new String[]{"x", "y",
}, new int[]{R.id.x_var,
R.id.y_var});
lv.setAdapter(adapter); */
Log.i(TAG, "onPostExecute: value of list is" + valueslist);
ArrayList<String> xVals = new ArrayList<>();
/*ArrayList<Entry> yVals = new ArrayList<Entry>();
/*for(Map<String,String> map:valueslist){
String tagName = map.get(TAG_VALUEx);
Log.i(TAG, "onPostExecute: value is"+ tagName);
String tagNameY=map.get(TAG_VALUEy);
Log.i(TAG, "onPostExecute: value of y is"+tagNameY);
addEntry(tagName,tagNameY);
}*/
HashMap<String,String> sortedList=sortByValues(valueslist);
Log.i(TAG,"sorted hash map is "+sortedList);
for (Map.Entry<String, String> entry : sortedList.entrySet()) {
System.out.println(entry.getKey() + " " + entry.getValue());
String tagName = entry.getKey();
long timestampString = Long.parseLong(tagName);
String value = new java.text.SimpleDateFormat("dd/MM/yyyy").
format(new java.util.Date(timestampString * 1000));
/*// String newval=value.substring(0, value.indexOf(' '));
Date date= new Date();
SimpleDateFormat fmtOut = new SimpleDateFormat("dd/MM/yyyy");
try {
date=fmtOut.parse(value);
} catch (ParseException e) {
e.printStackTrace();
}*/
String tagNameY=entry.getValue();
//Log.i(TAG, "onPostExecute: value of date is"+date);
addEntry(value,tagNameY);
}
}
}
}
Here's the error:
I/MainActivity: addEntry: date as x isTue Jan 03 00:00:00 GMT+01:00 2017
I/System.out: 1483488000 1126.7633375
I/MainActivity: addEntry: value of Y axis is 1126.7633
I/MainActivity: addEntry: date as x isWed Jan 04 00:00:00 GMT+01:00 2017
I/System.out: 1454457600 368.38
I/MainActivity: addEntry: value of Y axis is 368.38
I/MainActivity: addEntry: date as x isWed Feb 03 00:00:00 GMT+01:00 2016
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.garima.bitcoingraph, PID: 3095
java.lang.IllegalArgumentException: new x-value must be greater then the last value. x-values has to be ordered in ASC.
at com.jjoe64.graphview.series.BaseSeries.checkValueOrder(BaseSeries.java:486)
at com.jjoe64.graphview.series.BaseSeries.appendData(BaseSeries.java:408)
at com.jjoe64.graphview.series.LineGraphSeries.appendData(LineGraphSeries.java:646)
at com.jjoe64.graphview.series.BaseSeries.appendData(BaseSeries.java:464)
at com.example.garima.bitcoingraph.MainActivity.addEntry(MainActivity.java:177)
at com.example.garima.bitcoingraph.MainActivity.-wrap0(MainActivity.java)
at com.example.garima.bitcoingraph.MainActivity$JSONParse.onPostExecute(MainActivity.java:361)
at com.example.garima.bitcoingraph.MainActivity$JSONParse.onPostExecute(MainActivity.java:312)
at android.os.AsyncTask.finish(AsyncTask.java:660)
at android.os.AsyncTask.-wrap1(AsyncTask.java)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:677)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Application terminated.
java.lang.IllegalArgumentException: new x-value must be greater then
the last value. x-values has to be ordered in ASC.
I think you must order date in ascendant mode, then add to series of DataPoint.
Sorry if my english is not good.
I'm trying to pull all the data from a table using SELECT * from book, but I'm getting:
Attempt to invoke interface method 'java.sql.ResultSet java.sql.Statement.executeQuery(java.lang.String)' on a null object reference
I got it working when triggering the SQL statement in Eclipse. I'm trying to recreate it in Android Studio, but seems to throw this issue. Any help is appreciated.
SQL.java
package com.example.andy.loginapp;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
/**
* Created by Andy on 1/4/2017.
*/
public class SQL {
private Statement st;
private Connection con;
private ResultSet rs;
public SQL(){
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sqltest", "root", "");
st = con.createStatement();
}
catch(Exception e){
System.out.println(e);
}
}
public void getData(){
try{
String query = "SELECT * from book";
String queryInsert = "INSERT into Book " + "VALUE(authorField.getText(), titleField.getText(), yearField.getText())";
rs = st.executeQuery(query);
while(rs.next()){
String author = rs.getString("author");
String title = rs.getString("title");
System.out.println("Author: " + author + " " + "Title" + " " + title);
}
}
catch(Exception e){
System.out.println(e);
}
System.out.println("success");
}
}
MainActivity.java
package com.example.andy.loginapp;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutCompat;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import org.w3c.dom.Text;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
public class MainActivity extends AppCompatActivity {
private Statement st;
private Connection con;
private ResultSet rs;
TextView hi;
RelativeLayout background;
Button sqlButton;
SQL data = new SQL();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sqlButton = (Button) findViewById(R.id.sqlButton);
sqlButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
data.getData();
}
});
}
}
You would have to write a webservice to connect to any external databases such as MYSQL to connect android application to a database. It also involves writing a very basic PHP script.
See the following link for some examples.
https://www.b4x.com/android/forum/threads/connect-android-to-mysql-database-tutorial.8339/
http://www.androidhive.info/2012/05/how-to-connect-android-with-php-mysql/
So you're better off using SQLLite unless its absolutely necessary.
I need to show toast message when the server is not responding
when I press the login button, some parameters are passed to AgAppMenu screen which use url connection to server and get xml response in AgAppHelperMethods screen. The
probelm is when the server is busy or the network is not avaibale, I can't show toast message on catch block although it shows the log message.
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent ;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class LoginScreen extends Activity implements OnClickListener {
EditText mobile;
EditText pin;
Button btnLogin;
Button btnClear;
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.agapplogin);
TextView lblMobileNo = (TextView) findViewById(R.id.lblMobileNo);
lblMobileNo.setTextColor(getResources()
.getColor(R.color.text_color_red));
mobile = (EditText) findViewById(R.id.txtMobileNo);
TextView lblPinNo = (TextView) findViewById(R.id.lblPinNo);
lblPinNo.setTextColor(getResources().getColor(R.color.text_color_red));
pin = (EditText) findViewById(R.id.txtPinNo);
btnLogin = (Button) findViewById(R.id.btnLogin);
btnClear = (Button) findViewById(R.id.btnClear);
btnLogin.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
postLoginData();
}
});
btnClear.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
cleartext();
}
});
/*
*
* btnClear.setOnClickListener(new OnClickListener() { public void
* onClick(View arg0) {
*
* } });
*/
}
public void postLoginData()
{
if (pin.getTextSize() == 0 || mobile.getTextSize() == 0) {
AlertDialog.Builder altDialog = new AlertDialog.Builder(this);
altDialog.setMessage("Please Enter Complete Information!");
} else {
Intent i = new Intent(this.getApplicationContext(), AgAppMenu.class);
Bundle bundle = new Bundle();
bundle.putString("mno", mobile.getText().toString());
bundle.putString("pinno", pin.getText().toString());
i.putExtras(bundle);
startActivity(i);
}
}
#Override
public void onClick(View v) {
}
public void cleartext() {
{
pin.setText("");
mobile.setText("");
}
}
}
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class AgAppMenu extends Activity {
String mno, pinno;
private String[][] xmlRespone;
Button btnMiniStatement;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.agappmenu);
mno = getIntent().getExtras().getString("mno");
pinno = getIntent().getExtras().getString("pinno");
setTitle("Welcome to the Ag App Menu");
AgAppHelperMethods agapp =new AgAppHelperMethods();
// xmlRespone = AgAppHelperMethods.AgAppXMLParser("AG_IT_App/AgMainServlet?messageType=LOG&pin=" + pinno + "&mobile=" + mno + "&source=" + mno + "&channel=INTERNET");
xmlRespone = agapp.AgAppXMLParser("AG_IT_App/AgMainServlet?messageType=LOG&pin=" + pinno + "&mobile=" + mno + "&source=" + mno + "&channel=INTERNET");
import java.net.URL;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import android.view.View;
import android.view.View.OnKeyListener;
public class AgAppHelperMethods extends Activity {
private static final String LOG_TAG = null;
private static AgAppHelperMethods instance = null;
public static String varMobileNo;
public static String varPinNo;
String[][] xmlRespone = null;
boolean flag = true;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.agapphelpermethods);
}
protected AgAppHelperMethods() {
}
public static AgAppHelperMethods getInstance() {
if (instance == null) {
instance = new AgAppHelperMethods();
}
return instance;
}
public static String getUrl() {
String url = "https://demo.accessgroup.mobi/";
return url;
}
public String[][] AgAppXMLParser(String parUrl) {
String _node, _element;
String[][] xmlRespone = null;
try {
String url = AgAppHelperMethods.getUrl() + parUrl;
URL finalUrl = new URL(url);
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(finalUrl.openStream()));
doc.getDocumentElement().normalize();
NodeList list = doc.getElementsByTagName("*");
_node = new String();
_element = new String();
xmlRespone = new String[list.getLength()][2];
// this "for" loop is used to parse through the
// XML document and extract all elements and their
// value, so they can be displayed on the device
for (int i = 0; i < list.getLength(); i++) {
Node value = list.item(i).getChildNodes().item(0);
_node = list.item(i).getNodeName();
_element = value.getNodeValue();
xmlRespone[i][0] = _node;
xmlRespone[i][1] = _element;
}// end for
throw new ArrayIndexOutOfBoundsException();
}// end try
// will catch any exception thrown by the XML parser
catch (Exception e) {
Toast.makeText(AgAppHelperMethods.this,
"error server not responding " + e.getMessage(),
Toast.LENGTH_SHORT).show();
Log.e(LOG_TAG, "CONNECTION ERROR FUNDAMO SERVER NOT RESPONDING", e);
}
// Log.e(LOG_TAG, "CONNECTION ERROR FUNDAMO SERVER NOT RESPONDING", e);
return xmlRespone;
}
`
AgAppHelperMethods isn't really an Activity. You've derived this class from Activity, but then you've created Singleton management methods (getInstance()) and you are instantiating it yourself. This is bad. Don't do this.
Normally Android controls the instantiation of activities. You don't ever create one yourself (with new).
It looks to me like AgAppHelperMethods just needs to be a regular Java class. It doesn't need to inherit from anything. Remove also the lifecycle methods like onCreate().
Now you will have a problem with the toast, because you need a context for that and AgAppHelperMethods isn't a Context. To solve that you can add Context as a parameter to AgAppXMLParser() like this:
public String[][] AgAppXMLParser(Context context, String parUrl) {
...
// Now you can use "context" to create your toast.
}
When you call AgAppXMLParser() from AgAppMenu just pass "this" as the context parameter.