add a Share button to the menu

app/src/main/AndroidManifest.xml

@@ -27,7 +27,6 @@
 
         <activity
             android:name=".activities.ViewPagerActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar"/>
+            android:screenOrientation="portrait"/>
     </application>
 </manifest>

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

@@ -4,7 +4,10 @@ import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.MediaStore;
+import android.support.v7.app.ActionBar;
 import android.support.v7.app.AppCompatActivity;
+import android.view.Menu;
+import android.view.MenuItem;
 import android.view.View;
 
 import java.io.File;
@@ -20,6 +23,7 @@ import gallery.simplemobiletools.com.adapters.MyPagerAdapter;
 public class ViewPagerActivity extends AppCompatActivity {
     private int pos;
     private boolean isFullScreen;
+    private ActionBar actionbar;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -27,6 +31,7 @@ public class ViewPagerActivity extends AppCompatActivity {
         setContentView(R.layout.activity_photo);
 
         pos = 0;
+        actionbar = getSupportActionBar();
         isFullScreen = true;
         hideSystemUI();
 
@@ -46,6 +51,22 @@ public class ViewPagerActivity extends AppCompatActivity {
         });
     }
 
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.menu, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.menu_share:
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+
     private List<String> getPhotos() {
         final List<String> photos = new ArrayList<>();
         final String path = getIntent().getStringExtra(Constants.PHOTO);
@@ -87,6 +108,9 @@ public class ViewPagerActivity extends AppCompatActivity {
     }
 
     private void hideSystemUI() {
+        if (actionbar != null)
+            actionbar.hide();
+
         getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
                 View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
                 View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
@@ -96,6 +120,9 @@ public class ViewPagerActivity extends AppCompatActivity {
     }
 
     private void showSystemUI() {
+        if (actionbar != null)
+            actionbar.show();
+
         getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
                 View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
                 View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);

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

@@ -0,0 +1,10 @@
+<?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/menu_share"
+        app:showAsAction="always"
+        android:icon="@android:drawable/ic_menu_share"
+        android:title="Share"/>
+
+</menu>