Simple html parsing to get feed url

.idea/misc.xml

@@ -29,7 +29,7 @@
       </value>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

app/build.gradle

@@ -16,10 +16,16 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    compileOptions {
+        sourceCompatibility = '1.8'
+        targetCompatibility = '1.8'
+    }
 }
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation project(':readropslibrary')
+
     implementation 'com.android.support:appcompat-v7:28.0.0'
     implementation 'com.android.support.constraint:constraint-layout:1.1.3'
     testImplementation 'junit:junit:4.12'

app/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.readrops.app">
 
+    <uses-permission android:name="android.permission.INTERNET" />
+
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
@@ -9,6 +11,9 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
+
+
+
         <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -17,5 +22,4 @@
             </intent-filter>
         </activity>
     </application>
-
 </manifest>

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

@@ -2,12 +2,27 @@ package com.readrops.app;
 
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.util.Log;
+
+import com.readrops.readropslibrary.PageParser;
 
 public class MainActivity extends AppCompatActivity {
 
+    String url = "https://framablog.org/";
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        Thread thread = new Thread(()-> {
+            String feedUrl = PageParser.getFeedLink(url);
+
+            Log.d("", "");
+        });
+
+        thread.start();
     }
+
+
 }

readropslibrary/build.gradle

@@ -35,4 +35,6 @@ dependencies {
     implementation 'com.squareup.retrofit2:retrofit:2.4.0'
     implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
     implementation 'com.squareup.retrofit2:converter-simplexml:2.4.0'
+
+    implementation 'org.jsoup:jsoup:1.11.3'
 }

readropslibrary/src/main/AndroidManifest.xml

@@ -1,2 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.readrops.readropslibrary" />
+    package="com.readrops.readropslibrary">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+</manifest>

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

@@ -0,0 +1,41 @@
+package com.readrops.readropslibrary;
+
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+import org.jsoup.select.Elements;
+
+import java.io.IOException;
+
+public final class PageParser {
+
+    public static String getFeedLink(String url) {
+        String feedUrl = null;
+
+        try {
+            Document document = Jsoup.connect(url).get();
+
+            Elements elements = document.select("link");
+
+            for (Element element : elements) {
+                String type = element.attributes().get("type");
+
+                if (isTypeRssFeed(type)) {
+                    feedUrl = element.attributes().get("href");
+                    break;
+                }
+            }
+
+            return feedUrl;
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    private static boolean isTypeRssFeed(String type) {
+        return type.equals("application/rss+xml") || type.equals("application/atom+xml") || type.equals("application/json");
+    }
+
+}

readropslibrary/src/main/java/com/readrops/readropslibrary/services/NextCloudNewsAPI.java

@@ -2,11 +2,10 @@ package com.readrops.readropslibrary.services;
 
 import com.readrops.readropslibrary.services.nextcloudnews.Folders;
 
-import io.reactivex.Observable;
 import retrofit2.http.GET;
 
 public interface NextCloudNewsAPI {
 
     @GET("folders")
-    Observable<Folders> getFolders();
+    Folders getFolders();
 }