offer opening third party videos too with the gallery

app/src/main/AndroidManifest.xml

@@ -50,5 +50,18 @@
             </intent-filter>
         </activity>
 
+        <activity
+            android:name=".activities.VideoActivity"
+            android:theme="@style/FullScreenTheme">
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW"/>
+
+                <category android:name="android.intent.category.BROWSABLE"/>
+                <category android:name="android.intent.category.DEFAULT"/>
+
+                <data android:mimeType="video/*"/>
+            </intent-filter>
+        </activity>
+
     </application>
 </manifest>

app/src/main/java/com/simplemobiletools/gallery/activities/PhotoActivity.java

@@ -23,7 +23,7 @@ public class PhotoActivity extends AppCompatActivity implements ViewPagerFragmen
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        setContentView(R.layout.photo_layout);
+        setContentView(R.layout.fragment_holder);
 
         uri = getIntent().getData();
         if (uri == null)
@@ -39,7 +39,7 @@ public class PhotoActivity extends AppCompatActivity implements ViewPagerFragmen
         final ViewPagerFragment fragment = new PhotoFragment();
         fragment.setListener(this);
         fragment.setArguments(bundle);
-        getSupportFragmentManager().beginTransaction().replace(R.id.photo_holder, fragment).commit();
+        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_holder, fragment).commit();
         hideSystemUI();
         setTitle(Utils.getFilename(uri.toString()));
     }

app/src/main/java/com/simplemobiletools/gallery/activities/VideoActivity.java

@@ -0,0 +1,90 @@
+package com.simplemobiletools.gallery.activities;
+
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.v7.app.ActionBar;
+import android.support.v7.app.AppCompatActivity;
+import android.view.Menu;
+import android.view.MenuItem;
+
+import com.simplemobiletools.gallery.Constants;
+import com.simplemobiletools.gallery.R;
+import com.simplemobiletools.gallery.Utils;
+import com.simplemobiletools.gallery.fragments.VideoFragment;
+import com.simplemobiletools.gallery.fragments.ViewPagerFragment;
+import com.simplemobiletools.gallery.models.Medium;
+
+public class VideoActivity extends AppCompatActivity implements ViewPagerFragment.FragmentClickListener {
+    private ActionBar actionbar;
+    private boolean isFullScreen;
+    private Uri uri;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.fragment_holder);
+
+        uri = getIntent().getData();
+        if (uri == null)
+            return;
+
+        actionbar = getSupportActionBar();
+        isFullScreen = true;
+        hideSystemUI();
+
+        final Bundle bundle = new Bundle();
+        final Medium medium = new Medium(uri.toString(), true);
+        bundle.putSerializable(Constants.MEDIUM, medium);
+        final ViewPagerFragment fragment = new VideoFragment();
+        fragment.setListener(this);
+        fragment.setArguments(bundle);
+        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_holder, fragment).commit();
+        hideSystemUI();
+        setTitle(Utils.getFilename(uri.toString()));
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.photo_video_menu, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.menu_share:
+                shareMedium();
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+
+    private void shareMedium() {
+        final String shareTitle = getResources().getString(R.string.share_via);
+        final Intent sendIntent = new Intent();
+        sendIntent.setAction(Intent.ACTION_SEND);
+        sendIntent.putExtra(Intent.EXTRA_STREAM, uri);
+        sendIntent.setType("video/*");
+        startActivity(Intent.createChooser(sendIntent, shareTitle));
+    }
+
+    @Override
+    public void fragmentClicked() {
+        isFullScreen = !isFullScreen;
+        if (isFullScreen) {
+            hideSystemUI();
+        } else {
+            showSystemUI();
+        }
+    }
+
+    private void hideSystemUI() {
+        Utils.hideSystemUI(actionbar, getWindow());
+    }
+
+    private void showSystemUI() {
+        Utils.showSystemUI(actionbar, getWindow());
+    }
+}

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

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
-    android:id="@+id/photo_holder"
+    android:id="@+id/fragment_holder"
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"

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

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout
-    android:id="@+id/photo_holder"
+    android:id="@+id/fragment_holder"
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"