I think we have authentication working - need to test to make sure it saves the token and not a load of extra http response stuff though.

app/src/main/java/uk/org/openseizuredetector/AuthCallbackInterface.java

@@ -0,0 +1,6 @@
+package uk.org.openseizuredetector;
+
+// Interface used by the authentication part of WebApi to send back the authentication token
+public interface AuthCallbackInterface {
+        void authCallback(boolean success, String tokenStr);
+}

app/src/main/java/uk/org/openseizuredetector/AuthenticateActivity.java

@@ -13,7 +13,7 @@ import android.widget.Button;
 import android.widget.EditText;
 import android.widget.LinearLayout;
 
-public class AuthenticateActivity extends AppCompatActivity {
+public class AuthenticateActivity extends AppCompatActivity implements AuthCallbackInterface {
     private String TAG = "AuthenticateActivity";
     private Context mContext;
     private EditText mUnameEt;
@@ -34,7 +34,7 @@ public class AuthenticateActivity extends AppCompatActivity {
 
         mUnameEt = (EditText) findViewById(R.id.username);
         mPasswdEt = (EditText) findViewById(R.id.password);
-        mWac = new WebApiConnection(this);
+        mWac = new WebApiConnection(this, this);
     }
 
     @Override
@@ -43,6 +43,11 @@ public class AuthenticateActivity extends AppCompatActivity {
         switchUi();
     }
 
+    public void authCallback(boolean authSuccess, String tokenStr) {
+        Log.v(TAG,"authCallback");
+        switchUi();
+    }
+
     private void switchUi() {
         SharedPreferences prefs;
         String storedAuthToken;

app/src/main/java/uk/org/openseizuredetector/WebApiConnection.java

@@ -1,6 +1,9 @@
 package uk.org.openseizuredetector;
 
 import android.content.Context;
+import android.content.SharedPreferences;
+import android.icu.text.RelativeDateTimeFormatter;
+import android.preference.PreferenceManager;
 import android.util.Log;
 
 
@@ -15,50 +18,66 @@ import com.android.volley.toolbox.Volley;
 import org.json.JSONException;
 import org.json.JSONObject;
 
+import java.util.HashMap;
+import java.util.Map;
+
+
 // This class is intended to handle all interactions with the OSD WebAPI
 public class WebApiConnection {
     public String retVal;
     public int retCode;
     private String mUrlBase = "https://osdApi.ddns.net";
     private String TAG = "WebApiConnection";
+    private AuthCallbackInterface mAuthCallback;
+    private Context mContext;
     RequestQueue mQueue;
 
-    public WebApiConnection(Context context) {
+    public WebApiConnection(Context context, AuthCallbackInterface authCallback) {
+        mContext = context;
+        mAuthCallback = authCallback;
         mQueue = Volley.newRequestQueue(context);
     }
 
-    public boolean authenticate(String uname, String passwd) {
+    public boolean authenticate(final String uname, final String passwd) {
+        // NOTE:  the 'final' keyword is necessary for uname and passwd to be accessible to getParams below - I don't know why!
         // We know that this command works, so we just need the Java equivalent:
         // curl -X POST -d 'login=graham4&password=testpwd1' https://osdapi.ddns.net/api/accounts/login/
+        // sending the credentials as a JSONObject postData did not work, so try the method from:
+        //    https://protocoderspoint.com/login-and-registration-form-in-android-using-volley-keeping-user-logged-in/#Login_Registration_form_in_android_using_volley_library
         String urlStr = mUrlBase + "/api/accounts/login/";
         Log.v(TAG, "urlStr=" + urlStr);
 
-        JSONObject postData = new JSONObject();
+        StringRequest req = new StringRequest(Request.Method.POST, urlStr,
-        try {
+                new Response.Listener<String>() {
-            postData.put("login", uname);
-            postData.put("password", passwd);
-
-        } catch (JSONException e) {
-            Log.e(TAG,e.getMessage());
-        }
-
-        Log.v(TAG,postData.toString());
-        JsonObjectRequest req = new JsonObjectRequest(Request.Method.POST, urlStr, postData,
-                new Response.Listener<JSONObject>() {
                     @Override
-                    public void onResponse(JSONObject response) {
+                    public void onResponse(String response) {
-                        // Display the first 500 characters of the response string.
                         Log.v(TAG, "Response is: " + response);
+                        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mContext);
+                        prefs.edit().putString("webApiAuthToken", response).commit();
+                        mAuthCallback.authCallback(true, response);
                     }
                 },
                 new Response.ErrorListener() {
                     @Override
                     public void onErrorResponse(VolleyError error) {
                         String responseBody = new String(error.networkResponse.data);
-                        Log.v(TAG, "Login Error" + error.toString()+","+error.getMessage()+error.networkResponse.statusCode+","+responseBody);
+                        Log.v(TAG, "Login Error: " + error.toString() + ", message:" + error.getMessage()+", Response Code:" + error.networkResponse.statusCode + ", Response: " + responseBody);
+                        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mContext);
+                        prefs.edit().putString("webApiAuthToken", null).commit();
+                        mAuthCallback.authCallback(false,new String(error.networkResponse.data));
                     }
-                }
+                }) {
-        );
+            // Note, this is overriding part of StringRequest, not one of the sub-classes above!
+            @Override
+            protected Map<String, String> getParams() {
+                Map<String, String> params = new HashMap<>();
+                // params.put("name",sname); // passing parameters to server
+                params.put("login", uname);
+                params.put("password", passwd);
+                return params;
+            }
+        };
+
         mQueue.add(req);
         return (true);
     }