Add suwFooter attribute to GlifLayout

Add the suwFooter attribute so custom footer layouts can be easily
added, in conjunction with <aapt:attr> tag.

Test: ./gradlew connectedAndroidTest test
Bug: 36009807
Change-Id: Id7d937486451e34bdc30775a0f5f3dfcde47598f

library/main/res/values/attrs.xml

@@ -88,9 +88,10 @@
     </declare-styleable>
 
     <declare-styleable name="SuwGlifLayout">
-        <attr name="suwColorPrimary" />
         <attr name="suwBackgroundPatterned" format="boolean" />
         <attr name="suwBackgroundBaseColor" format="color" />
+        <attr name="suwColorPrimary" />
+        <attr name="suwFooter" format="reference" />
     </declare-styleable>
 
     <declare-styleable name="SuwStatusBarBackgroundLayout">

library/main/src/com/android/setupwizardlib/GlifLayout.java

@@ -31,6 +31,7 @@ import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.ViewStub;
 import android.widget.ProgressBar;
 import android.widget.ScrollView;
 import android.widget.TextView;
@@ -123,6 +124,11 @@ public class GlifLayout extends TemplateLayout {
                 a.getBoolean(R.styleable.SuwGlifLayout_suwBackgroundPatterned, true);
         setBackgroundPatterned(backgroundPatterned);
 
+        final int footer = a.getResourceId(R.styleable.SuwGlifLayout_suwFooter, 0);
+        if (footer != 0) {
+            inflateFooter(footer);
+        }
+
         a.recycle();
     }
 
@@ -142,6 +148,19 @@ public class GlifLayout extends TemplateLayout {
         return super.findContainer(containerId);
     }
 
+    /**
+     * Sets the footer of the layout, which is at the bottom of the content area outside the
+     * scrolling container. The footer can only be inflated once per layout.
+     *
+     * @param footer The layout to be inflated as footer.
+     * @return The root of the inflated footer view.
+     */
+    public View inflateFooter(@LayoutRes int footer) {
+        ViewStub footerStub = (ViewStub) findManagedViewById(R.id.suw_layout_footer);
+        footerStub.setLayoutResource(footer);
+        return footerStub.inflate();
+    }
+
     public ScrollView getScrollView() {
         final View view = findManagedViewById(R.id.suw_scroll_view);
         return view instanceof ScrollView ? (ScrollView) view : null;

library/test/robotest/src/com/android/setupwizardlib/GlifLayoutTest.java

@@ -49,6 +49,7 @@ import com.android.setupwizardlib.view.StatusBarBackgroundLayout;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
 import org.robolectric.annotation.Config;
 
 @RunWith(SuwLibRobolectricTestRunner.class)
@@ -224,6 +225,32 @@ public class GlifLayoutTest {
                 layout.getMixin(ProgressBarMixin.class));
     }
 
+    @Test
+    public void testInflateFooter() {
+        GlifLayout layout = new GlifLayout(mContext);
+
+        final View view = layout.inflateFooter(android.R.layout.simple_list_item_1);
+        assertEquals(android.R.id.text1, view.getId());
+        assertNotNull(layout.findViewById(android.R.id.text1));
+    }
+
+    @Config(qualifiers = "sw600dp")
+    @Test
+    public void testInflateFooterTablet() {
+        testInflateFooter();
+    }
+
+    @Test
+    public void testFooterXml() {
+        GlifLayout layout = new GlifLayout(
+                mContext,
+                Robolectric.buildAttributeSet()
+                        .addAttribute(R.attr.suwFooter, "@android:layout/simple_list_item_1")
+                        .build());
+
+        assertNotNull(layout.findViewById(android.R.id.text1));
+    }
+
     private Drawable getPhoneBackground(GlifLayout layout) {
         final StatusBarBackgroundLayout patternBg =
                 (StatusBarBackgroundLayout) layout.findManagedViewById(R.id.suw_pattern_bg);