ViewMediaActivity: add a button to open media file in external application just in case built-in fails

app/src/main/java/com/keylesspalace/tusky/ViewMediaActivity.kt

@@ -142,6 +142,7 @@ class ViewMediaActivity : BaseActivity(), ViewImageFragment.PhotoActionsListener
         toolbar.setNavigationOnClickListener { supportFinishAfterTransition() }
         toolbar.setOnMenuItemClickListener { item: MenuItem ->
             when (item.itemId) {
+                R.id.action_open_in_external_app -> openInExternalApp()
                 R.id.action_download -> requestDownloadMedia()
                 R.id.action_open_status -> onOpenStatus()
                 R.id.action_share_media -> shareMedia()
@@ -269,6 +270,19 @@ class ViewMediaActivity : BaseActivity(), ViewImageFragment.PhotoActionsListener
         startActivity(Intent.createChooser(sendIntent, resources.getText(R.string.send_media_to)))
     }
 
+    private fun openInExternalApp() {
+        val url = attachments!![viewPager.currentItem].attachment.url
+        val intent = Intent(Intent.ACTION_VIEW)
+        val extension = MimeTypeMap.getFileExtensionFromUrl(url)
+        if(extension != null) {
+            intent.setDataAndType(Uri.parse(url), MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension))
+        } else {
+            intent.data = Uri.parse(url)
+        }
+
+        startActivity(intent)
+    }
+
 
     private var isCreating: Boolean = false
 

app/src/main/res/drawable/ic_exit_to_app_24px.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="#FFFFFFFF"
+      android:pathData="M10.09,15.59L11.5,17l5,-5 -5,-5 -1.41,1.41L12.67,11H3v2h9.67l-2.58,2.59zM19,3H5c-1.11,0 -2,0.9 -2,2v4h2V5h14v14H5v-4H3v4c0,1.1 0.89,2 2,2h14c1.1,0 2,-0.9 2,-2V5c0,-1.1 -0.9,-2 -2,-2z"/>
+</vector>

app/src/main/res/menu/view_media_toolbar.xml

@@ -1,6 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/action_open_in_external_app"
+        android:icon="@drawable/ic_exit_to_app_24px"
+        android:title="@string/action_open_in_external_app"
+        app:showAsAction="ifRoom" />
     <item
         android:id="@+id/action_download"
         android:icon="@drawable/ic_file_download_black_24dp"

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

@@ -9,6 +9,7 @@
     <string name="action_enable_formatting_syntax">Enable %s</string>
     <string name="action_disable_formatting_syntax">Disable %s</string>
     <string name="action_sticker">Stickers</string>
+    <string name="action_open_in_external_app">Open in external app</string>
     
     <string name="title_emoji_reacted_by">%s reacted by</string>