Custom actionbar to indicate swipe down effect

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/KeyListFragment.java

@@ -36,6 +36,7 @@ import android.support.v4.content.Loader;
 import android.support.v4.view.MenuItemCompat;
 import android.support.v4.widget.CursorAdapter;
 import android.support.v4.widget.SwipeRefreshLayout;
+import android.support.v7.app.ActionBar;
 import android.support.v7.app.ActionBarActivity;
 import android.support.v7.widget.SearchView;
 import android.view.ActionMode;
@@ -43,6 +44,7 @@ import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
@@ -94,6 +96,8 @@ public class KeyListFragment extends LoaderFragment
     private Button mButtonEmptyCreate;
     private Button mButtonEmptyImport;
 
+    boolean hideMenu = false;
+
     /**
      * Load custom layout with StickyListView from library
      */
@@ -134,10 +138,50 @@ public class KeyListFragment extends LoaderFragment
                 R.color.android_purple_dark,
                 R.color.android_purple_light);
         mSwipeRefreshLayout.setStickyListHeadersListView(mStickyList);
+        mSwipeRefreshLayout.setOnTouchListener(new View.OnTouchListener() {
+            @Override
+            public boolean onTouch(View v, MotionEvent event) {
+                if (event.getAction() == MotionEvent.ACTION_MOVE) {
+                    updateActionbarForSwipe(true);
+                } else {
+                    updateActionbarForSwipe(false);
+                }
+                return false;
+            }
+        });
 
         return root;
     }
 
+    private void updateActionbarForSwipe(boolean show) {
+        ActionBarActivity activity = (ActionBarActivity) getActivity();
+        ActionBar bar = activity.getSupportActionBar();
+
+        if (show) {
+            bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
+            bar.setDisplayUseLogoEnabled(false);
+            bar.setCustomView(R.layout.custom_actionbar);
+            TextView title = (TextView) getActivity().findViewById(R.id.custom_actionbar_text);
+            title.setText(R.string.swipe_to_update);
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
+                hideMenu = true;
+                activity.invalidateOptionsMenu();
+            }
+        } else {
+            bar.setTitle(getActivity().getTitle());
+            bar.setDisplayHomeAsUpEnabled(true);
+            bar.setDisplayShowTitleEnabled(true);
+            bar.setDisplayUseLogoEnabled(true);
+            bar.setDisplayShowHomeEnabled(true);
+            bar.setDisplayShowCustomEnabled(false);
+
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
+                hideMenu = false;
+                activity.invalidateOptionsMenu();
+            }
+        }
+    }
+
     @Override
     public void onResume() {
         String[] servers = Preferences.getPreferences(getActivity()).getKeyServers();
@@ -421,6 +465,12 @@ public class KeyListFragment extends LoaderFragment
             }
         });
 
+        if (hideMenu) {
+            for (int i = 0; i < menu.size(); i++) {
+                menu.getItem(i).setVisible(false);
+            }
+        }
+
         super.onCreateOptionsMenu(menu, inflater);
     }
 
@@ -723,5 +773,6 @@ public class KeyListFragment extends LoaderFragment
             }
         };
         updateHelper.updateAllKeys(getActivity(), finishedHandler);
+        updateActionbarForSwipe(false);
     }
 }

OpenKeychain/src/main/res/layout/custom_actionbar.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical">
+
+    <TextView
+        android:id="@+id/custom_actionbar_text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text=""
+        android:textSize="18sp" />
+</LinearLayout>

OpenKeychain/src/main/res/values/strings.xml

@@ -834,6 +834,7 @@
     <string name="error_no_encrypt_subkey">"No encryption subkey available!"</string>
     <string name="info_no_manual_account_creation">"Do not create OpenKeychain-Accounts manually.\nFor more information, see Help."</string>
     <string name="contact_show_key">"Show key (%s)"</string>
+    <string name="swipe_to_update">"Swipe down to update from keyserver"</string>
 
     <!-- First Time -->
     <string name="first_time_text1">"Take back your privacy with OpenKeychain!"</string>