[REFACTOR] Added support for blog URL by removing hard coded logic for youtube preview.

app/src/main/java/com/hossainkhan/android/demo/data/ResourceInfo.kt

@@ -16,8 +16,9 @@
 
 package com.hossainkhan.android.demo.data
 
+import android.net.Uri
 import com.google.firebase.Timestamp
-import java.util.*
+import java.util.Date
 
 
 /**
@@ -50,4 +51,13 @@ data class ResourceInfo(
             val date = publish_date?.toDate() ?: Date()
             return FirestoreDateFormatter.date(date)
         }
+
+    val isYouTubeUrl: Boolean = url.contains("youtube.com/watch?v=", ignoreCase = true)
+
+    /**
+     * Provides [Uri] for directly invoking youtube app via Android Intent.
+     * @throws IllegalStateException if the URL is not for youtube. Check [isYouTubeUrl] first.
+     */
+    val youtubeIntentUri: String
+        get() = if (isYouTubeUrl) ("vnd.youtube:" + url.split("=")[1]) else throw IllegalStateException("Not a YouTube URL.")
 }

app/src/main/java/com/hossainkhan/android/demo/ui/resource/LearningResourceActivity.kt

@@ -85,15 +85,18 @@ class LearningResourceActivity : AppCompatActivity() {
     }
 
     private fun openContent(resourceInfo: ResourceInfo) {
-        // TODO: Update logic later when the URL is not only youtube.
-        val intentApp = Intent(Intent.ACTION_VIEW,
-                Uri.parse("vnd.youtube:" + resourceInfo.url.split("=")[1]))
+        val urlPreviewUri = Uri.parse(resourceInfo.url) // Generic URL preview using any supported app.
+
+        val previewContentIntent = if (resourceInfo.isYouTubeUrl) {
+            Intent(Intent.ACTION_VIEW, Uri.parse(resourceInfo.youtubeIntentUri))
+        } else {
+            Intent(Intent.ACTION_VIEW, urlPreviewUri)
+        }
 
-        val intentBrowser = Intent(Intent.ACTION_VIEW, Uri.parse(resourceInfo.url))
         try {
-            startActivity(intentApp)
+            startActivity(previewContentIntent)
         } catch (ex: ActivityNotFoundException) {
-            startActivity(intentBrowser)
+            startActivity(Intent(Intent.ACTION_VIEW, urlPreviewUri))
         }
     }
 }

app/src/test/java/com/hossainkhan/android/demo/data/ResourceInfoTest.kt

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2019 Hossain Khan
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hossainkhan.android.demo.data
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+/**
+ * Tests [ResourceInfo].
+ */
+class ResourceInfoTest {
+
+    @Test
+    fun isYouTubeUrl_givenValidUrl_returnsTrue() {
+        val resourceInfoYoutube = ResourceInfo(url = "https://www.youtube.com/watch?v=29gLA90m6Gk")
+
+        assertTrue(resourceInfoYoutube.isYouTubeUrl)
+    }
+
+    @Test
+    fun isYouTubeUrl_givenInvalidUrl_returnsFalse() {
+        val resourceInfoYoutube = ResourceInfo(url = "https://hossainkhan.com/watch?v=29gLA90m6Gk")
+
+        assertFalse(resourceInfoYoutube.isYouTubeUrl)
+    }
+
+    @Test
+    fun getYoutubeIntentUri_givenValidUrl_providesYoutubeIntentUri() {
+        val resourceInfoYoutube = ResourceInfo(url = "https://www.youtube.com/watch?v=29gLA90m6Gk")
+
+        assertEquals("vnd.youtube:29gLA90m6Gk", resourceInfoYoutube.youtubeIntentUri)
+    }
+
+    @Test(expected = IllegalStateException::class)
+    fun getYoutubeIntentUri_givenInvalidUrl_throwsException() {
+        val resourceInfoYoutube = ResourceInfo(url = "https://hossainkhan.com")
+
+        resourceInfoYoutube.youtubeIntentUri
+    }
+}