allow opening other photos with the Gallery

app/src/main/AndroidManifest.xml

@@ -36,5 +36,19 @@
             android:name=".activities.LicenseActivity"
             android:label="@string/third_party_licences"
             android:screenOrientation="portrait"/>
+
+        <activity
+            android:name=".activities.PhotoActivity"
+            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="image/*"/>
+            </intent-filter>
+        </activity>
+
     </application>
 </manifest>

app/src/main/java/com/simplemobiletools/gallery/Utils.java

@@ -5,6 +5,9 @@ import android.content.Context;
 import android.content.pm.PackageManager;
 import android.content.res.Resources;
 import android.support.v4.content.ContextCompat;
+import android.support.v7.app.ActionBar;
+import android.view.View;
+import android.view.Window;
 import android.widget.Toast;
 
 public class Utils {
@@ -28,4 +31,25 @@ public class Utils {
     public static boolean hasStoragePermission(Context cxt) {
         return ContextCompat.checkSelfPermission(cxt, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED;
     }
+
+    public static void showSystemUI(ActionBar actionbar, Window window) {
+        if (actionbar != null)
+            actionbar.show();
+
+        window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
+                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
+                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+    }
+
+    public static void hideSystemUI(ActionBar actionbar, Window window) {
+        if (actionbar != null)
+            actionbar.hide();
+
+        window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
+                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
+                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
+                View.SYSTEM_UI_FLAG_LOW_PROFILE |
+                View.SYSTEM_UI_FLAG_FULLSCREEN |
+                View.SYSTEM_UI_FLAG_IMMERSIVE);
+    }
 }

app/src/main/java/com/simplemobiletools/gallery/activities/PhotoActivity.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.PhotoFragment;
+import com.simplemobiletools.gallery.fragments.ViewPagerFragment;
+import com.simplemobiletools.gallery.models.Medium;
+
+public class PhotoActivity 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.photo_layout);
+
+        uri = getIntent().getData();
+        if (uri == null)
+            return;
+
+        actionbar = getSupportActionBar();
+        isFullScreen = true;
+        hideSystemUI();
+
+        final Bundle bundle = new Bundle();
+        final Medium medium = new Medium(uri.toString(), false);
+        bundle.putSerializable(Constants.MEDIUM, medium);
+        final ViewPagerFragment fragment = new PhotoFragment();
+        fragment.setListener(this);
+        fragment.setArguments(bundle);
+        getSupportFragmentManager().beginTransaction().replace(R.id.photo_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("image/*");
+        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/java/com/simplemobiletools/gallery/activities/ViewPagerActivity.java

@@ -315,24 +315,11 @@ public class ViewPagerActivity extends AppCompatActivity
     }
 
     private void hideSystemUI() {
-        if (actionbar != null)
+        Utils.hideSystemUI(actionbar, getWindow());
-            actionbar.hide();
-
-        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
-                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
-                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
-                View.SYSTEM_UI_FLAG_LOW_PROFILE |
-                View.SYSTEM_UI_FLAG_FULLSCREEN |
-                View.SYSTEM_UI_FLAG_IMMERSIVE);
     }
 
     private void showSystemUI() {
-        if (actionbar != null)
+        Utils.showSystemUI(actionbar, getWindow());
-            actionbar.show();
-
-        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
-                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
-                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
     }
 
     private void updateActionbarTitle() {

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

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout
+    android:id="@+id/photo_holder"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@android:color/black"/>

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

@@ -0,0 +1,9 @@
+<?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"
+        android:icon="@mipmap/share"
+        android:title="@string/share"
+        app:showAsAction="ifRoom"/>
+</menu>