<NME> IAbstractActivity.java
<BEF> package cgeo.geocaching.activity;


public interface IAbstractActivity {

    void showToast(String text);

    public void showShortToast(String text);

    public void invalidateOptionsMenuCompatible();
}

<MSG> fix #4213: showcase for cache list activity
<DFF> @@ -8,4 +8,18 @@ public interface IAbstractActivity {
     public void showShortToast(String text);
 
     public void invalidateOptionsMenuCompatible();
+
+    /**
+     * Override this method to create a showcase view highlighting the most important UI element.
+     *
+     */
+    public ShowcaseViewBuilder getShowcase();
+
+    /**
+     * Call this method to actually present a showcase. The right time to invoke this method depends on the showcase
+     * target. I.e. if the showcase target is an action bar item, this method can only be invoked after that item has
+     * been created in onCreateOptionsMenu.
+     */
+    public void presentShowcase();
+
 }

fix #4213: showcase for cache list activity