Add tip for clear memory cache

app/src/main/java/com/hippo/ehviewer/ui/fragment/AdvancedFragment.java

@@ -99,6 +99,7 @@ public class AdvancedFragment extends BaseSettingsFragment {
         } else if (KEY_CLEAR_MEMORY_CACHE.equals(key)) {
             ((EhApplication) getActivity().getApplication()).clearMemoryCache();
             Runtime.getRuntime().gc();
+            ((SettingsActivity) requireActivity()).showTip(R.string.settings_advanced_clear_memory_cache_done, BaseScene.LENGTH_SHORT);
         } else if (KEY_IMPORT_DATA.equals(key)) {
             Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
             intent.addCategory(Intent.CATEGORY_OPENABLE);

app/src/main/res/values-zh-rCN/strings.xml

@@ -740,4 +740,5 @@
     <string name="follow_app">跟随应用</string>
     <string name="settings_e_ink_mode_title">墨水屏模式</string>
     <string name="settings_e_ink_mode_summary">为墨水屏做一些优化</string>
+    <string name="settings_advanced_clear_memory_cache_done">完成内存缓存清理</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -804,4 +804,5 @@
     <string name="follow_app">Follow app</string>
     <string name="settings_e_ink_mode_title">E-Ink mode</string>
     <string name="settings_e_ink_mode_summary">Some optimizations for the ink screen.</string>
+    <string name="settings_advanced_clear_memory_cache_done">Memory cache cleaning completed</string>
 </resources>