Added search functionality to "add apps to swap" screen.

This was present in the old local repo implementation, and the skeleton
code for implementing it was copied to the swap fragment. The only change
neccesary was to add a search button to the menu and make it have a
SearchView as its action view.

F-Droid/res/menu/swap_next_search.xml

@@ -0,0 +1,14 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android" >
+
+    <item
+        android:id="@+id/action_next"
+        android:title="Next"
+        android:titleCondensed="Next"/>
+
+    <item
+        android:id="@+id/action_search"
+        android:icon="@android:drawable/ic_menu_search"
+        android:title="Search"
+        android:titleCondensed="Search"/>
+
+</menu>

F-Droid/src/org/fdroid/fdroid/views/swap/SelectAppsFragment.java

@@ -10,6 +10,7 @@ import android.support.v4.content.CursorLoader;
 import android.support.v4.content.Loader;
 import android.support.v4.view.MenuItemCompat;
 import android.support.v4.widget.SimpleCursorAdapter;
+import android.support.v7.widget.SearchView;
 import android.text.TextUtils;
 import android.view.ActionMode;
 import android.view.ContextThemeWrapper;
@@ -20,7 +21,6 @@ import android.view.View;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.ListView;
-import android.widget.SearchView;
 import android.widget.TextView;
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.R;
@@ -36,7 +36,6 @@ public class SelectAppsFragment extends ThemeableListFragment
 
     private PackageManager packageManager;
     private Drawable defaultAppIcon;
-    private ActionMode mActionMode = null;
     private String mCurrentFilterString;
     private Set<String> previouslySelectedApps = new HashSet<String>();
 
@@ -52,10 +51,18 @@ public class SelectAppsFragment extends ThemeableListFragment
 
     @Override
     public void onCreateOptionsMenu(Menu menu, MenuInflater menuInflater) {
-        menuInflater.inflate(R.menu.swap_next, menu);
+        menuInflater.inflate(R.menu.swap_next_search, menu);
         MenuItem nextMenuItem = menu.findItem(R.id.action_next);
         int flags = MenuItemCompat.SHOW_AS_ACTION_ALWAYS | MenuItemCompat.SHOW_AS_ACTION_WITH_TEXT;
         MenuItemCompat.setShowAsAction(nextMenuItem, flags);
+
+        SearchView searchView = new SearchView(getActivity());
+
+        MenuItem searchMenuItem = menu.findItem(R.id.action_search);
+        MenuItemCompat.setActionView(searchMenuItem, searchView);
+        MenuItemCompat.setShowAsAction(searchMenuItem, MenuItemCompat.SHOW_AS_ACTION_IF_ROOM);
+
+        searchView.setOnQueryTextListener(this);
     }
 
     @Override