Support multiple columns in select widgets

collect_app/src/main/java/org/odk/collect/android/widgets/SelectWidget.java

@@ -18,6 +18,7 @@
 
 import android.content.Context;
 import android.support.v7.widget.DividerItemDecoration;
+import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.util.DisplayMetrics;
 import android.view.LayoutInflater;
@@ -39,6 +40,8 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import timber.log.Timber;
+
 public abstract class SelectWidget extends QuestionWidget {
 
     /**
@@ -165,6 +168,7 @@ public void addMediaFromChoice(MediaLayout mediaLayout, int index, TextView text
     protected RecyclerView setUpRecyclerView() {
         RecyclerView recyclerView = (RecyclerView) LayoutInflater.from(getContext()).inflate(R.layout.recycler_view, null); // keep in an xml file to enable the vertical scrollbar
         recyclerView.addItemDecoration(new DividerItemDecoration(getContext(), DividerItemDecoration.VERTICAL));
+        recyclerView.setLayoutManager(new GridLayoutManager(getContext(), getNumberOfColumns()));
 
         return recyclerView;
     }
@@ -179,4 +183,25 @@ void adjustRecyclerViewSize(AbstractSelectListAdapter adapter, RecyclerView recy
             recyclerView.setNestedScrollingEnabled(false);
         }
     }
+
+    private int getNumberOfColumns() {
+        String columnsAppearance = "columns";
+
+        int numberOfColumns = 1;
+        String appearance = WidgetFactory.getAppearance(getFormEntryPrompt());
+        if (appearance.contains(columnsAppearance)) {
+            try {
+                appearance =
+                        appearance.substring(appearance.indexOf(columnsAppearance), appearance.length());
+                int idx = appearance.indexOf('-');
+                if (idx != -1) {
+                    numberOfColumns = Integer.parseInt(appearance.substring(idx + 1));
+                }
+            } catch (Exception e) {
+                Timber.e("Exception parsing columns");
+            }
+        }
+
+        return numberOfColumns;
+    }
 }

collect_app/src/main/java/org/odk/collect/android/widgets/WidgetFactory.java

@@ -34,6 +34,7 @@
 import java.util.List;
 import java.util.Locale;
 
+import io.reactivex.annotations.NonNull;
 import timber.log.Timber;
 
 /**
@@ -47,6 +48,25 @@ private WidgetFactory() {
 
     }
 
+    // Get appearance hint and clean it up so it is lower case, without the search function and never null.
+    @NonNull
+    static String getAppearance(FormEntryPrompt fep) {
+        String appearance = fep.getAppearanceHint();
+        if (appearance == null) {
+            appearance = "";
+        } else {
+            // For now, all appearance tags are in English.
+            appearance = appearance.toLowerCase(Locale.ENGLISH);
+
+            // Strip out the search() appearance/function which is handled in ExternalDataUtil so that
+            // it is not considered when matching other appearances. For example, a file named list.csv
+            // used as a parameter to search() should not be interpreted as a list appearance.
+            appearance = ExternalDataUtil.SEARCH_FUNCTION_REGEX.matcher(appearance).replaceAll("");
+        }
+
+        return appearance;
+    }
+
     /**
      * Returns the appropriate QuestionWidget for the given FormEntryPrompt.
      *
@@ -57,18 +77,7 @@ private WidgetFactory() {
     public static QuestionWidget createWidgetFromPrompt(FormEntryPrompt fep, Context context,
                                                         boolean readOnlyOverride) {
 
-        // Get appearance hint and clean it up so it is lower case and never null.
-        String appearance = fep.getAppearanceHint();
-        if (appearance == null) {
-            appearance = "";
-        }
-        // For now, all appearance tags are in English.
-        appearance = appearance.toLowerCase(Locale.ENGLISH);
-
-        // Strip out the search() appearance/function which is handled in ExternalDataUtil so that
-        // it is not considered when matching other appearances. For example, a file named list.csv
-        // used as a parameter to search() should not be interpreted as a list appearance.
-        appearance = ExternalDataUtil.SEARCH_FUNCTION_REGEX.matcher(appearance).replaceAll("");
+        String appearance = getAppearance(fep);
 
         final QuestionWidget questionWidget;
         switch (fep.getControlType()) {

collect_app/src/main/res/layout/recycler_view.xml

@@ -15,10 +15,8 @@ limitations under the License.
 -->
 <android.support.v7.widget.RecyclerView
     xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:scrollbars="vertical"
     android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    app:layoutManager="android.support.v7.widget.LinearLayoutManager">
+    android:layout_height="wrap_content">
 
 </android.support.v7.widget.RecyclerView>