Store JWT token in shared preference? And retrieve value in whole app?

Question

So far I made an app for my customer and now I integrate laravel API I don't understand the way how JWT tokens store in session and retrieve into other activities. Basically, on successful login API create JWT token and response I want to save it in session. I am able to retrieve the token from the JSON object in the result variable and I display it into logs but I don't find the way how I can store the token into session and then retrieve into all my app. Below my code :

public class LoginActivity extends Activity {
    private static final String TAG = RegisterActivity.class.getSimpleName();
    private Button btnLogin;
    private Button btnLinkToRegister;
    private EditText inputEmail;
    private EditText inputPassword;
    private ProgressDialog pDialog;
    private SessionManager session;
    private SQLiteHandler db;
    String  result;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        inputEmail = (EditText) findViewById(R.id.email);
        inputPassword = (EditText) findViewById(R.id.password);
        btnLogin = (Button) findViewById(R.id.btnLogin);


        // Progress dialog
        pDialog = new ProgressDialog(this);
        pDialog.setCancelable(false);



        // Session manager
        session = new SessionManager(getApplicationContext());

        // Check if user is already logged in or not
        if (session.isLoggedIn()) {
            // User is already logged in. Take him to main activity
            Intent intent = new Intent(LoginActivity.this, MainActivity.class);
            startActivity(intent);
            finish();
        }


        btnLogin.setOnClickListener(new View.OnClickListener() {

            public void onClick(View view) {
                String email = inputEmail.getText().toString().trim();
                String password = inputPassword.getText().toString().trim();

                // Check for empty data in the form
                if (!email.isEmpty() && !password.isEmpty()) {
                    // login user
                    checkLogin(email, password);
                } else {
                    // Prompt user to enter credentials
                    Toast.makeText(getApplicationContext(),
                            "Please enter the credentials!", Toast.LENGTH_LONG)
                            .show();
                }
            }

        });


    }

    /**
     * function to verify login details in mysql db
     * */
    private void checkLogin(final String email, final String password) {
        // Tag used to cancel the request
        String tag_string_req = "req_login";

        pDialog.setMessage("Logging in ...");
        showDialog();

        StringRequest strReq = new StringRequest(Method.POST,
                AppConfig.URL_LOGIN, new Response.Listener<String>() {

            @Override
            public void onResponse(String response) {

                Log.e(TAG, "Login Response: " + response.toString());


                hideDialog();

                try {
                    JSONObject jObj = new JSONObject(response);
                    boolean error = jObj.getBoolean("error");

                    // Check for error node in json
                    if (!error) {
                        // user successfully logged in
                        // Create login session
                        session.setLogin(true);

                        //This is status api returned e.g 200 etc
                        Integer status = jObj.getInt("status");
                        
                        //this is my token variable in this variable jwt is stored but how to store this variable in shared preferances.
                        String  result = jObj.getString("result");

                        Log.d(TAG, "Login Response: " + status.toString());
                        Log.e(TAG,"Token "+result.toString());
                        if(status == 200) {


                           
                            Intent intent = new Intent(LoginActivity.this,
                                    MainActivity.class);
                            //intent.putExtra("full_name", name);
                            intent.putExtra("result", result.toString());
                            startActivity(intent);
                            finish();
                        }
                    } else {
                        // Error in login. Get the error message
                        String errorMsg = jObj.getString("error_msg");
                        Toast.makeText(getApplicationContext(),
                                errorMsg, Toast.LENGTH_LONG).show();
                    }
                } catch (JSONException e) {
                    // JSON error
                    e.printStackTrace();
                    Toast.makeText(getApplicationContext(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
                }

            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e(TAG, "Login Error: " + error.getMessage());
                Toast.makeText(getApplicationContext(),
                        error.getMessage(), Toast.LENGTH_LONG).show();
                hideDialog();
            }
        }) {

            @Override
            protected Map<String, String > getParams() {
                // Posting parameters to login url
                Map<String, String> params = new HashMap<String, String>();
                params.put("email", email);
                params.put("password", password);
                //params.put("result", result);

                return params;
            }

        };

        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
    }

    private void showDialog() {
        if (!pDialog.isShowing())
            pDialog.show();
    }

    private void hideDialog() {
        if (pDialog.isShowing())
            pDialog.dismiss();
    }
}

This is my shared preferences class code :

public class SessionManager {
    // LogCat tag
    private static String TAG = SessionManager.class.getSimpleName();

    // Shared Preferences
    SharedPreferences pref;

    Editor editor;
    Context _context;

    // Shared pref mode
    int PRIVATE_MODE = 0;

    // Shared preferences file name
    private static final String PREF_NAME = "AndroidHiveLogin";
    
    private static final String KEY_IS_LOGGED_IN = "isLoggedIn";

    public SessionManager(Context context) {
        this._context = context;
        pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
        editor = pref.edit();
    }

    public void setLogin(boolean isLoggedIn) {

        editor.putBoolean(KEY_IS_LOGGED_IN, isLoggedIn);

        // commit changes
        editor.commit();

        Log.d(TAG, "User login session modified!");
    }
    
    public boolean isLoggedIn(){
        return pref.getBoolean(KEY_IS_LOGGED_IN, false);
    }
}

Answer 1

Add below methods in SessionManager class

 //Save String data to Shared Prefs
    public boolean saveStringData(String key, String value) {
        SharedPreferences.Editor editor=mSharedPref.edit ();
        editor.putString (key, value);
        return editor.commit ();
    }

    public String getStringData(String key) {
        String value=mSharedPref.getString (key, "");
        return value;
    }

Now on saving token call saveStringData method and pass a unique key (Remember on getting token this key will be used) and in value parameter pass token.

For getting token call getStringData method and pass that key which you passed when you saved token.

According to your query after adding above methods just write

1- For saving token :

session.saveStringData ("jwtToken", jObj.getString("result"));

2- For getting token anywhere in your application first initialize Session manager object and than call getStringData method like below.

private SessionManager session; 
session = new SessionManager(getApplicationContext()); 
String token = session.getStringData("jwtToken");