FooterPreference directs summary to title of preference

To compatible with preference controller design,
we override implementation of setSummary() which
directs summary to title of preference.

So, footer preference can be simply created in xml
and controlled by BasePreferenceController.

Test: visual, robotest
Bug: 124129485
Change-Id: I453ffc35761ecf24f2ac1415e0d674ac73c9c475

packages/SettingsLib/src/com/android/settingslib/widget/FooterPreference.java

@@ -17,6 +17,7 @@
 package com.android.settingslib.widget;
 
 import android.content.Context;
+import android.text.TextUtils;
 import android.text.method.LinkMovementMethod;
 import android.util.AttributeSet;
 import android.widget.TextView;
@@ -55,9 +56,26 @@ public class FooterPreference extends Preference {
         title.setLongClickable(false);
     }
 
+    @Override
+    public void setSummary(CharSequence summary) {
+        setTitle(summary);
+    }
+
+    @Override
+    public void setSummary(int summaryResId) {
+        setTitle(summaryResId);
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return getTitle();
+    }
+
     private void init() {
         setIcon(R.drawable.ic_info_outline_24);
-        setKey(KEY_FOOTER);
         setOrder(ORDER_FOOTER);
+        if (TextUtils.isEmpty(getKey())) {
+            setKey(KEY_FOOTER);
+        }
     }
 }

packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/FooterPreferenceTest.java

@@ -37,28 +37,29 @@ import org.robolectric.RuntimeEnvironment;
 public class FooterPreferenceTest {
 
     private Context mContext;
+    private FooterPreference mFooterPreference;
 
     @Before
     public void setUp() {
         mContext = RuntimeEnvironment.application;
-    }
-
-    @Test
-    public void createNewPreference_shouldSetKeyAndOrder() {
-        final FooterPreference preference = new FooterPreference(mContext);
-
-        assertThat(preference.getKey()).isEqualTo(FooterPreference.KEY_FOOTER);
-        assertThat(preference.getOrder()).isEqualTo(FooterPreference.ORDER_FOOTER);
+        mFooterPreference = new FooterPreference(mContext);
     }
 
     @Test
     public void bindPreference_shouldLinkifyContent() {
-        final FooterPreference preference = new FooterPreference(mContext);
         final PreferenceViewHolder holder = PreferenceViewHolder.createInstanceForTests(
                 LayoutInflater.from(mContext).inflate(R.layout.preference_footer, null));
 
-        preference.onBindViewHolder(holder);
+        mFooterPreference.onBindViewHolder(holder);
+
         assertThat(((TextView) holder.findViewById(android.R.id.title)).getMovementMethod())
                 .isInstanceOf(LinkMovementMethod.class);
     }
+
+    @Test
+    public void setSummary_summarySet_shouldSetAsTitle() {
+        mFooterPreference.setSummary("summary");
+
+        assertThat(mFooterPreference.getTitle()).isEqualTo("summary");
+    }
 }