Show post gallery comment error

app/src/main/java/com/hippo/ehviewer/client/EhEngine.java

@@ -55,6 +55,7 @@ import org.json.JSONArray;
 import org.json.JSONObject;
 import org.jsoup.Jsoup;
 import org.jsoup.nodes.Document;
+import org.jsoup.select.Elements;
 
 import java.io.File;
 import java.util.ArrayList;
@@ -391,6 +392,12 @@ public class EhEngine {
             headers = response.headers();
             body = response.body().string();
             Document document = Jsoup.parse(body);
+
+            Elements elements = document.select("#chd + p");
+            if (elements.size() > 0) {
+                throw new EhException(elements.get(0).text());
+            }
+
             return GalleryDetailParser.parseComments(document);
         } catch (Exception e) {
             throwException(call, code, headers, body, e);

app/src/main/java/com/hippo/ehviewer/ui/scene/EhCallback.java

@@ -40,6 +40,14 @@ public abstract class EhCallback<E extends SceneFragment, T> implements EhClient
 
     public abstract boolean isInstance(SceneFragment scene);
 
+    public Context getContent() {
+        Context context = getStageActivity();
+        if (context == null) {
+            context = getApplication();
+        }
+        return context;
+    }
+
     public EhApplication getApplication() {
         return mApplication;
     }
@@ -71,4 +79,14 @@ public abstract class EhCallback<E extends SceneFragment, T> implements EhClient
                     length == BaseScene.LENGTH_LONG ? Toast.LENGTH_LONG : Toast.LENGTH_SHORT).show();
         }
     }
+
+    public void showTip(String tip, int length) {
+        StageActivity activity = getStageActivity();
+        if (activity instanceof MainActivity) {
+            ((MainActivity) activity).showTip(tip, length);
+        } else {
+            Toast.makeText(getApplication(), tip,
+                    length == BaseScene.LENGTH_LONG ? Toast.LENGTH_LONG : Toast.LENGTH_SHORT).show();
+        }
+    }
 }

app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryCommentsScene.java

@@ -69,6 +69,7 @@ import com.hippo.scene.SceneFragment;
 import com.hippo.text.Html;
 import com.hippo.text.URLImageGetter;
 import com.hippo.util.DrawableManager;
+import com.hippo.util.ExceptionUtils;
 import com.hippo.util.ReadableTime;
 import com.hippo.util.TextUrl;
 import com.hippo.view.ViewTransition;
@@ -737,7 +738,7 @@ public final class GalleryCommentsScene extends ToolbarScene
 
         @Override
         public void onFailure(Exception e) {
-            showTip(R.string.comment_failed, LENGTH_SHORT);
+            showTip(getContent().getString(R.string.comment_failed) + "\n" + ExceptionUtils.getReadableString(e), LENGTH_SHORT);
         }
 
         @Override