added custom toast for the connection errors

APED/.idea/gradle.xml

@@ -10,8 +10,8 @@
         <option name="gradleJvm" value="1.8" />
         <option name="modules">
           <set>
-            <option value="$PROJECT_DIR$" />
+            <option value="$USER_HOME$/Storage/Programs/TH/MO_Mobile_Systeme/aped_app/APED" />
-            <option value="$PROJECT_DIR$/app" />
+            <option value="$USER_HOME$/Storage/Programs/TH/MO_Mobile_Systeme/aped_app/APED/app" />
           </set>
         </option>
         <option name="resolveModulePerSourceSet" value="false" />

APED/app/src/main/java/com/example/aped/communication/Communicator.java

@@ -1,13 +1,24 @@
 package com.example.aped.communication;
 
 import android.content.Context;
+import android.graphics.Color;
 import android.util.Log;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+import android.widget.Toast;
 
+import com.android.volley.NoConnectionError;
 import com.android.volley.Request;
 import com.android.volley.RequestQueue;
 import com.android.volley.Response;
+import com.android.volley.ServerError;
+import com.android.volley.TimeoutError;
+import com.android.volley.VolleyError;
 import com.android.volley.toolbox.JsonObjectRequest;
 import com.android.volley.toolbox.Volley;
+import com.example.aped.MainActivity;
+import com.example.aped.R;
 import com.example.aped.utils.ExternalStorageHandler;
 
 import org.json.JSONObject;
@@ -29,21 +40,21 @@ public class Communicator {
     /** Request queue used for asynchronous requests. **/
     private final RequestQueue requestQueue;
     /**The context of the application.**/
-    private final Context context;
+    private final MainActivity mainActivity;
 
     /**
      * Constructor of the Communicator.
      * @param pAddress the ipv4 address of the raspberry
      * @param pPort the port of the raspberry
-     * @param pContext the context of the application
+     * @param pMainActivity the main activity
      */
     public Communicator(final String pAddress,
                         final int pPort,
-                        final Context pContext) {
+                        final MainActivity pMainActivity) {
         this.address = pAddress;
         this.port = pPort;
-        requestQueue = Volley.newRequestQueue(pContext);
+        requestQueue = Volley.newRequestQueue(pMainActivity);
-        this.context = pContext;
+        this.mainActivity = pMainActivity;
     }
 
     /**
@@ -62,8 +73,7 @@ public class Communicator {
                 url,
                 null,
                 responseListener,
-                error -> Log.e("Communicator",
+                error -> handleError(error, "READ")
-                        "Error during READ: " + error.getMessage())
         );
         requestQueue.add(request);
     }
@@ -86,8 +96,7 @@ public class Communicator {
                 url,
                 message,
                 responseListener,
-                error -> Log.e("Communicator",
+                error -> handleError(error, "WRITE")
-                        "Error during WRITE: " + error.getMessage())
         );
         requestQueue.add(request);
     }
@@ -97,15 +106,14 @@ public class Communicator {
      */
     public void uploadXML() throws FileNotFoundException {
         File xmlFile = new File(ExternalStorageHandler
-                .getExternalPrivateStorageDir(context), "config.xml");
+                .getExternalPrivateStorageDir(mainActivity), "config.xml");
         String url = "http://" + address + ":" + port + "/XML/";
         FileOutputVolleyRequest request = new FileOutputVolleyRequest(
                 Request.Method.POST,
                 url,
                 xmlFile,
                 response -> System.out.println(response.toString()),
-                error -> Log.e("Communicator",
+                error -> handleError(error, "UPLOAD XML")
-                        "Error during XML UPLOAD" + error.getMessage())
         );
         requestQueue.add(request);
     }
@@ -122,10 +130,8 @@ public class Communicator {
                     try {
                         if (response != null) {
                             String xmlPath = ExternalStorageHandler
-                                    .getExternalPrivateStorageDir(context);
+                                    .getExternalPrivateStorageDir(mainActivity);
                             File xmlFile = new File(xmlPath, "config.xml");
-                            /*create the default XML config by using the
-                            default.xml from the assets folder*/
                             if (xmlFile.exists()) {
                                 xmlFile.delete();
                             }
@@ -141,9 +147,30 @@ public class Communicator {
                                         + e.getMessage());
                     }
                 },
-                error -> Log.e("Communicator",
+                error -> handleError(error,"XML DOWNLOAD")
-                        "Error during XML DOWNLOAD: " + error.getMessage())
         );
         requestQueue.add(request);
     }
+
+    private void handleError(VolleyError error, String method){
+        if (error instanceof ServerError){
+            Log.e("Communicator","server error during " + method + ": " + error.getMessage());
+        } else if (error instanceof NoConnectionError) {
+            makeToast("NO CONNECTION");
+        } else if (error instanceof TimeoutError) {
+            makeToast("CONNECTION TIMEOUT");
+        } else {
+            Log.e("Communicator","error during " + method + ": " + error.getMessage());
+        }
+    }
+
+    private void makeToast(String message){
+       Toast toast = new Toast(mainActivity);
+       View toastView = mainActivity.getLayoutInflater().inflate(R.layout.volley_toast, (ViewGroup) mainActivity.findViewById(R.id.volleyToastContainer));
+       TextView textView = toastView.findViewById(R.id.text);
+       textView.setText(message);
+       toast.setDuration(Toast.LENGTH_LONG);
+       toast.setView(toastView);
+       toast.show();
+    }
 }

APED/app/src/main/res/layout/volley_toast.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/volleyToastContainer"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <androidx.cardview.widget.CardView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:cardBackgroundColor="@color/red"
+        app:cardCornerRadius="10dp">
+
+        <TextView
+            android:id="@+id/text"
+            android:textColor="@color/white"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="bottom|center_horizontal"
+            android:padding="10dp"
+            android:textStyle="bold"
+            android:textSize="20dp"/>
+    </androidx.cardview.widget.CardView>
+
+
+
+</RelativeLayout>