Adding url field verification to add feed dialog (still lacks other http errors)

app/src/main/java/com/readrops/app/AddFeedDialog.java

@@ -11,6 +11,7 @@ import android.support.design.widget.TextInputEditText;
 import android.support.v7.widget.DividerItemDecoration;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
+import android.util.Patterns;
 import android.view.View;
 import android.widget.Button;
 import android.widget.ProgressBar;
@@ -18,6 +19,8 @@ import android.widget.ProgressBar;
 import com.readrops.readropslibrary.HtmlParser;
 import com.readrops.readropslibrary.ParsingResult;
 
+import java.io.IOException;
+import java.nio.charset.MalformedInputException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.Executors;
@@ -53,19 +56,49 @@ public class AddFeedDialog extends Dialog implements View.OnClickListener {
 
     @Override
     public void onClick(View view) {
+        if (isValidUrl()) {
             if (recyclerView != null && recyclerView.getVisibility() == View.VISIBLE)
                 recyclerView.setVisibility(View.GONE);
             progressBar.setVisibility(View.VISIBLE);
 
-        parseUrl(textInputEditText.getText().toString());
+            parseUrl();
+        }
     }
 
-    private void parseUrl(String url) {
+    private boolean isValidUrl() {
+        String url = textInputEditText.getText().toString().trim();
+
+        if (url.isEmpty()) {
+            textInputEditText.setError(getContext().getString(R.string.add_feed_empty_field));
+            return false;
+        } else if (!Patterns.WEB_URL.matcher(url).matches()) {
+            textInputEditText.setError(getContext().getString(R.string.add_feed_wrong_url));
+            return false;
+        } else
+            return true;
+    }
+
+    private void parseUrl() {
+        String url = textInputEditText.getText().toString().trim();
+
+        final String finalUrl;
+        if (!(url.contains(Utils.HTTP_PREFIX) || url.contains(Utils.HTTPS_PREFIX)))
+            finalUrl = Utils.HTTPS_PREFIX + url;
+        else
+            finalUrl = url;
+
+
         Executors.newSingleThreadExecutor().execute(() -> {
-            List<ParsingResult> results = HtmlParser.getFeedLink(url);
+            try {
+                List<ParsingResult> results = HtmlParser.getFeedLink(finalUrl);
 
                 Handler handler = new Handler(Looper.getMainLooper());
                 handler.post(() -> displayResults(results));
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+
+
         });
     }
 

app/src/main/java/com/readrops/app/Utils.java

@@ -0,0 +1,25 @@
+package com.readrops.app;
+
+import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+import android.widget.Toast;
+
+public final class Utils {
+
+    public static final String HTTP_PREFIX = "http://";
+
+    public static final String HTTPS_PREFIX = "https://";
+
+    public static void displayErrorInMainThread(Context context, String message) {
+        Toast toast = Toast.makeText(context, message, Toast.LENGTH_LONG);
+
+        if (!(Looper.myLooper() == Looper.getMainLooper())) {
+            Handler handler = new Handler(Looper.getMainLooper());
+            Looper.prepare();
+            handler.post(toast::show);
+        } else
+            toast.show();
+
+    }
+}

app/src/main/res/layout/add_feed_layout.xml

@@ -15,6 +15,9 @@
         android:layout_marginEnd="10dp"
         android:text="@string/add_feed_title"
         android:textAlignment="center"
+        android:textSize="22sp"
+        android:textColor="#FF3D3A3A"
+        android:textStyle="bold"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />

app/src/main/res/values-fr-rFR/strings.xml

@@ -11,5 +11,7 @@
     <string name="add_feed_title">Ajouter un flux</string>
     <string name="add_feed_url">Adresse du flux</string>
     <string name="add_feed_validate">Valider</string>
+    <string name="add_feed_empty_field">Le champ ne peut pas être vide</string>
+    <string name="add_feed_wrong_url">La valeur n\'est pas une adresse web valide</string>
 
 </resources>

app/src/main/res/values/strings.xml

@@ -12,4 +12,6 @@
     <string name="add_feed_title">Add feed</string>
     <string name="add_feed_url">Feed url</string>
     <string name="add_feed_validate">Validate</string>
+    <string name="add_feed_empty_field">Field can\'t be empty</string>
+    <string name="add_feed_wrong_url">Input is not a valid URL</string>
 </resources>

readropslibrary/src/main/java/com/readrops/readropslibrary/HtmlParser.java

@@ -20,9 +20,9 @@ public final class HtmlParser {
      * @param url url to request
      * @return a list of rss urls with their title
      */
-    public static List<ParsingResult> getFeedLink(String url) {
+    public static List<ParsingResult> getFeedLink(String url) throws Exception {
         List<ParsingResult> results = new ArrayList<>();
-        try {
+
         Document document = Jsoup.connect(url).get();
 
         Elements elements = document.select("link");
@@ -39,11 +39,7 @@ public final class HtmlParser {
         }
 
         return results;
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
 
-        return null;
     }
 
     private static boolean isTypeRssFeed(String type) {