Fix voice access problem on location page.

- Remove the seletcable attribute on footer preference so that
voice access can identify learn more.
- Apply latest footer preference API to set an action on learn more.
- Remove unuse string resource.

Test: Verify that talkback and voice access work well.
Fix: 189652942
Change-Id: I45fcd21d6a2d693d8b5eaa446aaccb769f1c0c7f

src/com/android/settings/location/LocationSettingsFooterPreferenceController.java

@@ -31,6 +31,7 @@ import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;
 
 import com.android.settings.R;
+import com.android.settingslib.HelpUtils;
 import com.android.settingslib.widget.FooterPreference;
 
 import java.util.ArrayList;
@@ -104,15 +105,22 @@ public class LocationSettingsFooterPreferenceController extends LocationBasePref
                     + footerString;
         }
         if (mFooterPreference != null) {
-            mFooterPreference.setTitle(Html.fromHtml(footerString
-                    + PARAGRAPH_SEPARATOR
-                    + mContext.getString(
-                    R.string.location_settings_footer_learn_more)));
-            mFooterPreference.setContentDescription(Html.fromHtml(footerString + mContext.getString(
-                    R.string.location_settings_footer_learn_more_content_description)));
+            mFooterPreference.setTitle(Html.fromHtml(footerString));
+            mFooterPreference.setLearnMoreAction(v -> openLocationLearnMoreLink());
+            mFooterPreference.setLearnMoreContentDescription(mContext.getString(
+                    R.string.location_settings_footer_learn_more_content_description));
         }
     }
 
+    private void openLocationLearnMoreLink() {
+        mFragment.startActivityForResult(
+                HelpUtils.getHelpIntent(
+                        mContext,
+                        mContext.getString(R.string.location_settings_footer_learn_more_link),
+                        /*backupContext=*/""),
+                /*requestCode=*/ 0);
+    }
+
     /**
      * Location footer preference group should always be displayed.
      */