Develop Reference

How can I connect my app to MS SQL database?

I am trying to create app that can connect to a MS SQL database when the user enters his username and password, I have tried multiple times and just cannot succeed. What would be the best way to connect my app?
This is the code that I have tried below.
public class LoginActivity extends AppCompatActivity {
private static String ip = "myip";
private static String port = "myportnum";
private static String Class = "net.sourceforge.jtds.jtbc.Driver";
private static String database = "name";
private static String username = "name";
private static String password = "password";
private static String url = "jdbc:jtds:sqlserver://"+ip+":"+port+"/"+database;
private Connection connection = null;
private EditText userNameET, passwordEt;
private Button loginBTN;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
userNameET = findViewById(R.id.userNameEditText);
passwordEt = findViewById(R.id.passEditText);
loginBTN = findViewById(R.id.loginBtn);
StrictMode.ThreadPolicy policy = null;
policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
// #android.support.annotation.RequiresApi(api = Build.VERSION_CODES.CUPCAKE)
private class DoLoginForUser extends AsyncTask<String, Void, String> {
String emailId, password;
#Override
protected void onPreExecute() {
super.onPreExecute();
emailId = userNameET.getText().toString();
password = passwordEt.getText().toString();
// progressBar.setVisibility(View.VISIBLE);
loginBTN.setVisibility(View.GONE);
}
#Override
protected String doInBackground(String... params) {
try {
ConnectionHelper con = new ConnectionHelper();
Connection connect = ConnectionHelper.CONN();
String query = "Select * from testDatabase where UserId='" + emailId + "'";
PreparedStatement ps = connect.prepareStatement(query);
Log.e("query",query);
ResultSet rs = ps.executeQuery();
if (rs.next()) {
String passcode = rs.getString("password");
connect.close();
rs.close();
ps.close();
if (passcode != null && !passcode.trim().equals("") && passcode.equals(password))
return "success";
else
return "Invalid Credentials";
} else
return "User does not exists.";
} catch (Exception e) {
return "Error:" + e.getMessage();
}
}
#Override
protected void onPostExecute(String result) {
//Toast.makeText(signup.this, result, Toast.LENGTH_SHORT).show();
// ShowSnackBar(result);
// progressBar.setVisibility(View.GONE);
loginBTN.setVisibility(View.VISIBLE);
if (result.equals("success")) {
SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences("userdetails",0);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("email",userNameET.getText().toString());
editor.commit();
Intent i = new Intent(LoginActivity.this, MainActivity.class);
startActivity(i);
} else {
//ShowSnackBar(result);
}
}
}
//public void ShowSnackBar(String message) {
// Snackbar.make(lvparent, message, Snackbar.LENGTH_LONG)
// .setAction("CLOSE", new View.OnClickListener() {
// #Override
// public void onClick(View view) {
//// }
// })
// .setActionTextColor(getResources().getColor(android.R.color.holo_red_light))
// .show();
// }
public void DoLogin(View v)
{
DoLoginForUser login = null;
login = new DoLoginForUser();
login.execute("");
}
I am expecting it to connect and then take me to the next screen.

Unable to get user id from JSON using shared preferences

JSON DATA
{
VerifiedMember: [{ user_id: "23", first_name: "karan", phone: "" }],
success: 1,
message: "success"
}
Login Activity Class
public class NewLogin extends AppCompatActivity {
private static final String PREFER_NAME = "Reg";
Button btnLogin;
private EditText editTextUserName;
private EditText editTextPassword;
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
SharedPreferences sharedPreferences;
// User Session Manager Class
UserSessionManager session;
String username;
String password;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_login);
// User Session Manager
session = new UserSessionManager(getApplicationContext());
sharedPreferences = getApplication().getSharedPreferences("KEY", Context.MODE_PRIVATE);
sharedPreferences = getSharedPreferences(PREFER_NAME, Context.MODE_PRIVATE);
editTextUserName = (EditText) findViewById(R.id.et_email);
editTextPassword = (EditText) findViewById(R.id.et_password);
Toast.makeText(getApplicationContext(),
"User Login Status: " + session.isUserLoggedIn(),
Toast.LENGTH_LONG).show();
}
public void invokeLogin(View view) {
new loginAccess().execute();
}
private class loginAccess extends AsyncTask<String, String, String> {
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(NewLogin.this);
pDialog.setMessage("Login...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
username = editTextUserName.getText().toString();
password = editTextPassword.getText().toString();
}
#Override
protected String doInBackground(String... arg0) {
List<NameValuePair> params = new ArrayList<>();
// Get username, password from EditText
String username = editTextUserName.getText().toString();
String password = editTextPassword.getText().toString();
String url = "xxxx.xxx";
JSONObject json;
int successValue = 0;
try {
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));
json = jsonParser.makeHttpRequest(url, "POST", params);
// Validate if username, password is filled
if(username.trim().length() > 0 && password.trim().length() > 0){
String uName = null;
String uPassword =null;
if (sharedPreferences.contains("username")) {
uName = sharedPreferences.getString("username", "");
}
if (sharedPreferences.contains("password")) {
uPassword = sharedPreferences.getString("password", "");
}
if (username.equals(uName) && password.equals(uPassword)) {
session.createUserLoginSession("username", "password");
} else {
}
}else{
}
Log.d("TESS :: ", json.toString());
successValue = json.getInt("success");
Log.d("Success Response :: ", String.valueOf(successValue));
} catch (Exception e1) {
// TODO Auto-generated catch block flag=1;
e1.printStackTrace();
}
return String.valueOf(successValue);
}
protected void onPostExecute(String jsonstring) {
pDialog.dismiss();
if (jsonstring.equals("1")) {
Intent i = new Intent(NewLogin.this, Sample.class);
startActivity(i);
finish();
} else {
Toast.makeText(NewLogin.this, "Please enter the correct details!!", Toast.LENGTH_LONG).show();
}
}
}
}
Sample activity:
public class Sample extends AppCompatActivity {
private static final String URL_DATA = "xxx.xxx";
// User Session Manager Class
UserSessionManager session;
LinearLayout linearLayout;
private RecyclerView recyclerView;
private RecyclerView.Adapter adapter;
private SwipeRefreshLayout swipeRefreshLayout;
private List<Data_SAerver> data_sAervers;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recyclerview);
// Session class instance
session = new UserSessionManager(getApplicationContext());
swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
loadRecyclerViewData();
swipeRefreshLayout.setRefreshing(false);
}
});
swipeRefreshLayout.setColorScheme(
android.R.color.holo_blue_bright,
android.R.color.holo_green_light,
android.R.color.holo_orange_light,
android.R.color.holo_red_light);
linearLayout = (LinearLayout) findViewById(R.id.linaralayout1);
linearLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(Sample.this, Post_data_Activity.class);
startActivity(i);
}
});
recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
data_sAervers = new ArrayList<>();
loadRecyclerViewData();
}
private void loadRecyclerViewData() {
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading...");
progressDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL_DATA, new Response.Listener<String>() {
#Override
public void onResponse(String s) {
progressDialog.dismiss();
String filename = "";
String filetype = "";
try {
JSONObject jsonObject = new JSONObject(s);
JSONArray posts = jsonObject.getJSONArray("posts");
if (posts != null && posts.length() > 0) {
for (int i = 0; i < posts.length(); i++) {
JSONObject fileObj = posts.getJSONObject(i);
String fName = fileObj.getString("firstname");
String created_at = fileObj.getString("created_at");
String post_desc = fileObj.getString("post_desc");
Log.e("Details", fName + "" + created_at + "" + post_desc);
JSONArray files = fileObj.getJSONArray("files");
if (files != null && files.length() > 0) {
for (int j = 0; j < files.length(); j++) {
JSONObject Jsonfilename = files.getJSONObject(j);
filename = Jsonfilename.getString("file_name");
filetype = Jsonfilename.getString("file_type");
if (filetype.equalsIgnoreCase("2")) {
filename = "xxx.xxx" + filename;
} else if(filetype.equalsIgnoreCase("1")) {
filename = "xxx.xxx" + filename;
}
Log.e("Files", "" + filename);
}
} else {
filename = "";
filetype = "";
}
Data_SAerver item = new Data_SAerver(fName, created_at, post_desc, filename, filetype);
data_sAervers.add(item);
}
}
adapter = new MyAdapter(data_sAervers, getApplicationContext());
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
swipeRefreshLayout.setRefreshing(false);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
progressDialog.dismiss();
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
// stopping swipe refresh
swipeRefreshLayout.setRefreshing(false);
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.menuLogout:
session.logoutUser();
/*startActivity(new Intent(this, NewLogin.class));
break;*/
}
return true;
}
}
MyAdapter class:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private List<Data_SAerver> data_sAervers;
private Context context;
public MyAdapter(List<Data_SAerver> data_sAervers, Context context) {
this.data_sAervers = data_sAervers;
this.context = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.sample, parent, false);
return new ViewHolder(v, context);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
final Data_SAerver data_sAerver = data_sAervers.get(position);
holder.firstname.setText(data_sAerver.getFirstname());
holder.created_at.setText(data_sAerver.getCreated_at());
holder.post_desc.setText(data_sAerver.getPost_desc());
holder.filepathurl.setText(data_sAerver.getfilepath());
if (data_sAerver.getFiletype().equals("1")) {
holder.files.setVisibility(View.VISIBLE);
Picasso.with(context).load(data_sAerver.getfilepath()).resize(736, 1128).onlyScaleDown().into(holder.files);
holder.playvideo.setVisibility(View.GONE);
} else {
if (data_sAerver.getFiletype().equals("2")) {
holder.playvideo.setVisibility(View.VISIBLE);
holder.files.setVisibility(View.GONE);
holder.playvideo.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent play = new Intent(context, PlayVideo.class);
play.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
play.putExtra("url", data_sAerver.getfilepath());
context.startActivity(play);
}
});
}
}
}
#Override
public int getItemCount() {
return data_sAervers.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
// User Session Manager Class
UserSessionManager session;
public TextView firstname, commenttext;
public TextView created_at;
public TextView post_desc;
public ImageView files;
public LinearLayout comment_linear_layout;
public TextView comment_btn;
public TextView filepathurl;
public TextView playvideo;
// private TextView editTextUserName;
public TextView onlinefirstname;
Context con;
public ViewHolder(View itemView, Context context) {
super(itemView);
filepathurl = (TextView) itemView.findViewById(R.id.filepathurl);
filepathurl.setVisibility(View.GONE);
// editTextUserName = (TextView) itemView.findViewById(R.id.editTextUserrName);
playvideo = (TextView) itemView.findViewById(R.id.playvideo);
firstname = (TextView) itemView.findViewById(R.id.firstname);
created_at = (TextView) itemView.findViewById(R.id.created_at);
post_desc = (TextView) itemView.findViewById(R.id.post_desc);
files = (ImageView) itemView.findViewById(R.id.image_files);
con = context;
// onlinefirstname = (TextView)itemView.findViewById(R.id.online_user_firstname);
SparkButton sparkButton = (SparkButton) itemView.findViewById(R.id.star_button1);
sparkButton.setChecked(false);
comment_btn = (TextView) itemView.findViewById(R.id.comment_btn);
comment_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(con, Popup_layout.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
con.startActivity(i);
}
});
}
}
}
UserSessionManager:
public class UserSessionManager {
// Shared Preferences reference
SharedPreferences pref;
// Editor reference for Shared preferences
Editor editor;
// Context
Context _context;
// Shared preferences mode
int PRIVATE_MODE = 0;
// Shared preferences file name
public static final String PREFER_NAME = "Reg";
// All Shared Preferences Keys
public static final String IS_USER_LOGIN = "IsUserLoggedIn";
// User name (make variable public to access from outside)
public static final String KEY_NAME = "username";
// Email address (make variable public to access from outside)
public static final String KEY_EMAIL = "firstname";
// password
public static final String KEY_PASSWORD = "password";
// Constructor
public UserSessionManager(Context context){
this._context = context;
pref = _context.getSharedPreferences(PREFER_NAME, PRIVATE_MODE);
editor = pref.edit();
}
//Create login session
public void createUserLoginSession(String uName, String uPassord){
// Storing login value as TRUE
editor.putBoolean(IS_USER_LOGIN, true);
// Storing name in pref
editor.putString(KEY_NAME, uName);
// Storing email in pref
editor.putString(KEY_PASSWORD, uPassord);
// commit changes
editor.commit();
}
/**
* Check login method will check user login status
* If false it will redirect user to login page
* Else do anything
* */
public boolean checkLogin() {
// Check login status
if (!this.isUserLoggedIn()) {
// user is not logged in redirect him to Login Activity
Intent i = new Intent(_context, Sample.class);
// Closing all the Activities from stack
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Add new Flag to start new Activity
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Staring Login Activity
_context.startActivity(i);
return true;
}
return false;
}
/**
* Get stored session data
* */
public HashMap<String, String> getUserDetails() {
//Use hashmap to store user credentials
HashMap<String, String> user = new HashMap<String, String>();
// user name
user.put(KEY_NAME, pref.getString(KEY_NAME, null));
// user email id
user.put(KEY_EMAIL, pref.getString(KEY_EMAIL, null));
// return user
return user;
}
/**
* Clear session details
* */
public void logoutUser() {
// Clearing all user data from Shared Preferences
editor.clear();
editor.commit();
// After logout redirect user to Login Activity
Intent i = new Intent(_context, NewLogin.class);
// Closing all the Activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Add new Flag to start new Activity
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Staring Login Activity
_context.startActivity(i);
}
// Check for login
public boolean isUserLoggedIn(){
return pref.getBoolean(IS_USER_LOGIN, false);
}
}
Here I am not able to get user_id using shared preference. Please help me how to get it.

In onPostExecute try this you will get User ID
try {
String userid;
JSONObject ob = new JSONObject(jsonstring);
JSONArray arr = ob.getJSONArray("VerifiedMember");
for (int i = 0; i < arr.length(); i++) {
JSONObject obj = arr.getJSONObject(i);
userid=obj.getString("user_id");
}
} catch (Exception e) {
}

You can use this pojo generator
http://www.jsonschema2pojo.org/
For parsing you can use google's gson library or jackson parser is also good.
http://www.vogella.com/tutorials/JavaLibrary-Gson/article.html

AsyncTask not working inside ViewPager

I am having problem with AsyncTask class inside ViewPager's Fragment.
I have added code like below inside ViewPager's 3rd Fragment:
private View.OnClickListener finishClickListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
UserIdAsyncTask userIdAsyncTask = new UserIdAsyncTask( getActivity(), "URL", "Test", "Value" );
userIdAsyncTask.execute();
Her is my UserIdAsyncTask class:
private class UserIdAsyncTask extends AsyncTask<Void, Void, String> {
String url = "";
String oldpass = "";
String newpass = "";
private Context mContext = null;
private ProgressDialog dialog;
public UserIdAsyncTask( Context context, String url, String oldPass, String newPass ) {
this.mContext = context;
this.url = url;
this.oldpass = oldPass;
this.newpass = newPass;
}
#Override
protected void onPreExecute() {
dialog = ProgressDialog.show(this.mContext, "", "Please wait...");
dialog.setCanceledOnTouchOutside(false);
dialog.show();
}
#Override
protected String doInBackground(Void... params) {
String str = "";
try {
return str;
} catch (Exception e) {
Log.e(ThirdFrag.class.toString(), e.getMessage(), e);
}
return str;
}
#Override
protected void onPostExecute(String response) {
dialog.dismiss();
Intent i = new Intent(getActivity(), ABC.class);
startActivity(i);
getActivity().finish();
}
}
In the given code, onPreExecute() called but doInBackground() never called.
Any ideas anyone? I'm really struggling with this one.

Android Login Activity

I have an application android with login activity. my application work perfectly but after I login and I close my application and than I open it again I always must login first. I don't know how to make my program just login once time.
My code like this
public class MainActivity extends Activity {
TextView btnForgot;
Button btnLogin;
EditText inputEmail;
EditText inputPassword;
private TextView loginErrorMsg;
private TextView macmac, macmac1;
private ProgressDialog pDialog;
private static String KEY_SUCCESS = "success";
private static String KEY_UID = "uid";
private static String KEY_USERNAME = "uname";
private static String KEY_FIRSTNAME = "fname";
private static String KEY_LASTNAME = "lname";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";
private static String MAC = "mac_0";
JSONParser jParser = new JSONParser();
JSONArray products = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnForgot = (TextView) findViewById(R.id.textView);
inputEmail = (EditText) findViewById(R.id.email);
inputPassword = (EditText) findViewById(R.id.password);
btnLogin = (Button) findViewById(R.id.btnLogin);
loginErrorMsg = (TextView) findViewById(R.id.loginErrorMsg);
TypedValue typedValueColorPrimaryDark = new TypedValue();
MainActivity.this.getTheme().resolveAttribute(R.attr.colorPrimary, typedValueColorPrimaryDark, true);
final int colorPrimaryDark = typedValueColorPrimaryDark.data;
if (Build.VERSION.SDK_INT >= 21) {
getWindow().setStatusBarColor(colorPrimaryDark);
}
/** Button Forgot Password **/
btnForgot.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), PasswordResetActivity.class);
startActivityForResult(myIntent, 0);
finish();
}});
/** Button Login **/
btnLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
if ( ( !inputEmail.getText().toString().equals("")) && ( !inputPassword.getText().toString().equals("")) )
{
NetAsync(view);
}
else if ( ( !inputEmail.getText().toString().equals("")) )
{
Toast.makeText(getApplicationContext(), "Password field empty", Toast.LENGTH_SHORT).show();
}
else if ( ( !inputPassword.getText().toString().equals("")) )
{
Toast.makeText(getApplicationContext(), "Email field empty", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(getApplicationContext(), "Email and Password field are empty", Toast.LENGTH_SHORT).show();
}
}
});
}
private class NetCheck extends AsyncTask<String,String,Boolean>
{
private ProgressDialog nDialog;
#Override
protected void onPreExecute(){
super.onPreExecute();
nDialog = new ProgressDialog(MainActivity.this);
nDialog.setTitle("Checking Network");
nDialog.setMessage("Loading..");
nDialog.setIndeterminate(false);
nDialog.setCancelable(true);
nDialog.show();
}
/** Gets current device state and checks for working internet connection by trying Google **/
#Override
protected Boolean doInBackground(String... args){
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnected()) {
try {
URL url = new URL("http://www.google.com");
HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
urlc.setConnectTimeout(3000);
urlc.connect();
if (urlc.getResponseCode() == 200) {
return true;
}
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return false;
}
#Override
protected void onPostExecute(Boolean th){
if(th == true){
nDialog.dismiss();
new ProcessLogin().execute();
}
else{
nDialog.dismiss();
loginErrorMsg.setText("Error in Network Connection");
}
}
}
/** Async Task to get and send data to My Sql database through JSON respone **/
private class ProcessLogin extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
String email,password,mac1;
#Override
protected void onPreExecute() {
super.onPreExecute();
inputEmail = (EditText) findViewById(R.id.email);
inputPassword = (EditText) findViewById(R.id.password);
email = inputEmail.getText().toString();
password = inputPassword.getText().toString();
//mac1 = macmac.getText().toString();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setTitle("Contacting Servers");
pDialog.setMessage("Logging in ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args) {
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.loginUser(email, password);
return json;
}
#Override
protected void onPostExecute(JSONObject json) {
try {
if (json.getString(KEY_SUCCESS) != null) {
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
pDialog.setMessage("Loading User Space");
pDialog.setTitle("Getting Data");
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
/** Clear all previous data in SQlite database **/
UserFunctions logout = new UserFunctions();
logout.logoutUser(getApplicationContext());
db.addUser(json_user.getString(KEY_FIRSTNAME),json_user.getString(KEY_LASTNAME),json_user.getString(KEY_EMAIL),json_user.getString(KEY_USERNAME),json_user.getString(KEY_UID),json_user.getString(KEY_CREATED_AT));
/** If JSON array details are stored in SQlite it launches the User Panel **/
Intent upanel = new Intent(getApplicationContext(), HomeActivity.class);
upanel.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
pDialog.dismiss();
new status_login().execute();
startActivity(upanel);
/** Close Login Screen **/
finish();
}else{
pDialog.dismiss();
loginErrorMsg.setText("Incorrect username or password");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
public void NetAsync(View view){
new NetCheck().execute();
}
}
anyone can help me to make my application just one time login?
thanks before

You must store the values within shared preference so that, untill the app data is cleared or no session destroyed by the user, user will be logged in within application, and the login screen will appear only once.

in you post execute, you know that your user has logged in successfully or not. so it would not so bad to set a preference to set that login is true, so in another activity you can check the value of that shared preference value and if it true then he was logged in successfully otherwise not. so write something the following way
// in this method where you find your user either to be logged in or failed
#Override
protected void onPostExecute(JSONObject json) {
try {
if (json.getString(KEY_SUCCESS) != null) {
if (login == true) {
SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putBoolean(getString(R.string.login), true);
editor.commit();
}
}
}
and your main activity check for it as shown below
SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
boolean login = getResources().getBoolean(R.string.login);
if (login) {
// do what you want to do
} else {
// prompt for login again
}
know more about SharedPreference

This is Your Answer
public class MainActivity extends Activity {
TextView btnForgot;
Button btnLogin;
EditText inputEmail;
EditText inputPassword;
private TextView loginErrorMsg;
private TextView macmac, macmac1;
private ProgressDialog pDialog;
private static String KEY_SUCCESS = "success";
private static String KEY_UID = "uid";
private static String KEY_USERNAME = "uname";
private static String KEY_FIRSTNAME = "fname";
private static String KEY_LASTNAME = "lname";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";
private static String MAC = "mac_0";
JSONParser jParser = new JSONParser();
JSONArray products = null;
SharedPreferences sharedPref;
SharedPreferences.Editor editor;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sharedPref = getSharedPreferences("MysharePrefrence", MODE_PRIVATE);
editor = sharedPref.edit();
boolean login = sharedPref.getBoolean("isLogin",false);
if (login)
{
Intent upanel = new Intent(getApplicationContext(), HomeActivity.class);
upanel.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(upanel);
finish();
}
btnForgot = (TextView) findViewById(R.id.textView);
inputEmail = (EditText) findViewById(R.id.email);
inputPassword = (EditText) findViewById(R.id.password);
btnLogin = (Button) findViewById(R.id.btnLogin);
loginErrorMsg = (TextView) findViewById(R.id.loginErrorMsg);
TypedValue typedValueColorPrimaryDark = new TypedValue();
MainActivity.this.getTheme().resolveAttribute(R.attr.colorPrimary, typedValueColorPrimaryDark, true);
final int colorPrimaryDark = typedValueColorPrimaryDark.data;
if (Build.VERSION.SDK_INT >= 21) {
getWindow().setStatusBarColor(colorPrimaryDark);
}
/** Button Forgot Password **/
btnForgot.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), PasswordResetActivity.class);
startActivityForResult(myIntent, 0);
finish();
}});
/** Button Login **/
btnLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
if ( ( !inputEmail.getText().toString().equals("")) && ( !inputPassword.getText().toString().equals("")) )
{
NetAsync(view);
}
else if ( ( !inputEmail.getText().toString().equals("")) )
{
Toast.makeText(getApplicationContext(), "Password field empty", Toast.LENGTH_SHORT).show();
}
else if ( ( !inputPassword.getText().toString().equals("")) )
{
Toast.makeText(getApplicationContext(), "Email field empty", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(getApplicationContext(), "Email and Password field are empty", Toast.LENGTH_SHORT).show();
}
}
});
}
private class NetCheck extends AsyncTask<String,String,Boolean>
{
private ProgressDialog nDialog;
#Override
protected void onPreExecute(){
super.onPreExecute();
nDialog = new ProgressDialog(MainActivity.this);
nDialog.setTitle("Checking Network");
nDialog.setMessage("Loading..");
nDialog.setIndeterminate(false);
nDialog.setCancelable(true);
nDialog.show();
}
/** Gets current device state and checks for working internet connection by trying Google **/
#Override
protected Boolean doInBackground(String... args){
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnected()) {
try {
URL url = new URL("http://www.google.com");
HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
urlc.setConnectTimeout(3000);
urlc.connect();
if (urlc.getResponseCode() == 200) {
return true;
}
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return false;
}
#Override
protected void onPostExecute(Boolean th){
if(th == true){
nDialog.dismiss();
new ProcessLogin().execute();
}
else{
nDialog.dismiss();
loginErrorMsg.setText("Error in Network Connection");
}
}
}
/** Async Task to get and send data to My Sql database through JSON respone **/
private class ProcessLogin extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
String email,password,mac1;
#Override
protected void onPreExecute() {
super.onPreExecute();
inputEmail = (EditText) findViewById(R.id.email);
inputPassword = (EditText) findViewById(R.id.password);
email = inputEmail.getText().toString();
password = inputPassword.getText().toString();
//mac1 = macmac.getText().toString();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setTitle("Contacting Servers");
pDialog.setMessage("Logging in ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args) {
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.loginUser(email, password);
return json;
}
#Override
protected void onPostExecute(JSONObject json) {
try {
if (json.getString(KEY_SUCCESS) != null) {
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
pDialog.setMessage("Loading User Space");
pDialog.setTitle("Getting Data");
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
/** Clear all previous data in SQlite database **/
UserFunctions logout = new UserFunctions();
logout.logoutUser(getApplicationContext());
db.addUser(json_user.getString(KEY_FIRSTNAME),json_user.getString(KEY_LASTNAME),json_user.getString(KEY_EMAIL),json_user.getString(KEY_USERNAME),json_user.getString(KEY_UID),json_user.getString(KEY_CREATED_AT));
/** If JSON array details are stored in SQlite it launches the User Panel **/
editor.putBoolean("isLogin",true);
editor.commit();
Intent upanel = new Intent(getApplicationContext(), HomeActivity.class);
upanel.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
pDialog.dismiss();
new status_login().execute();
startActivity(upanel);
/** Close Login Screen **/
finish();
}else{
pDialog.dismiss();
loginErrorMsg.setText("Incorrect username or password");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
public void NetAsync(View view){
new NetCheck().execute();
}
}

You can use a SharedPreferences object to save the login status. Once a user is successfully login you store a boolean flag, for example:
SharedPreferences sharedPref = getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putBoolean("signed_in", true);
editor.commit();
Next time you will just check this value.
SharedPreferences sharedPref = getPreferences(Context.MODE_PRIVATE);
if (sharedPref.getBoolean("signed_in", false) == true){
//user is login
}else{
//user not login
}

How to return Object which is inside anonymous inner class?

I've created this code to access user from my database for Login purpose. I can access the object 'st' when I'm inside OnResponse method but when I try to return return the object, it gives me null. Also when I try to access this st object before returning, it gives NullPointerException. What is the exact problem?
public class ServerRequests {
ProgressDialog progressDialog;
public static user_Student st;
public static final int CONNECTION_TIMEOUT = 1000 * 15;
public static final String SERVER_ADDRESS = "http://prem-pc:8989/";
Context ct;
public ServerRequests(Context context) {
ct = context;
progressDialog = new ProgressDialog(context);
progressDialog.setCancelable(false);
progressDialog.setTitle("Processing");
progressDialog.setMessage("Please Wait....");
}
public ServerRequests() {
}
public user_Student fetchUserDataInBackground(user_Student user) {
progressDialog.show();
Toast.makeText(ct, "Data in background: ", Toast.LENGTH_SHORT).show();
user_Student ust = doInBackground(user);
progressDialog.dismiss();
return ust;
}
public user_Student doInBackground(user_Student user) {
String URL = SERVER_ADDRESS + "connect.php?prn=" + user.prn + "&password=" + user.password;
RequestQueue req = Volley.newRequestQueue(ct);
Toast.makeText(ct, "Do in Background", Toast.LENGTH_SHORT).show();
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.GET, URL, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject jObject) {
try {
// Parsing json object response
// response will be a json object
if (jObject.length() == 0) {
st = null;
Toast.makeText(ct, "Null JSON Object", Toast.LENGTH_SHORT).show();
} else {
String prn = jObject.getString("prn");
String fname = jObject.getString("fname");
String mname = jObject.getString("mname");
String lname = jObject.getString("lname");
String clas = jObject.getString("clas");
String dept = jObject.getString("dept");
String batch = jObject.getString("batch");
String scontact = jObject.getString("scontact");
String pcontact = jObject.getString("pcontact");
String email = jObject.getString("email");
String password = jObject.getString("password");
String dob = jObject.getString("dob");
st = new user_Student(prn, fname, mname, lname, clas, dept, batch, scontact, pcontact, email, password, dob);
Toast.makeText(ct, "JSON Object:" + st.fname, Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(ct, "Error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(ct, error.getMessage(), Toast.LENGTH_SHORT).show(); // hide the progress dialog
}
});
req.add(jsonObjReq);
//Toast.makeText(ct,"DO in back End"+st.fname,Toast.LENGTH_SHORT).show();
return st;
}
}

You can't return from anonymous inner classes, but you could create a method inside ServerRequests that takes a user_Student as a parameter and call that method from within onResponse. This method could then do whatever you need.

You must use AsyncTask to do funtion doInBackground(user_Student user)
You can view this post to understand AsyncTask:
How to use AsyncTask correctly in Android