add unsubscribe to feed context menu

res/menu/feed_menu.xml

@@ -20,4 +20,8 @@
         android:id="@+id/create_shortcut"
         android:title="@string/place_shortcut"/>
 
+    <item
+     	android:id="@+id/unsubscribe_feed"
+        android:title="@string/unsubscribe"/>
+    
 </menu>

res/values/strings.xml

@@ -212,4 +212,7 @@
     <string name="prefs_compatible_article_layout">Compatible article layout</string>
     <string name="prefs_compatible_layout_summary">Enable if you see glitches in article content</string>
     <string name="font_size_dialog_suffix">sp</string>
+    <string name="server_function_not_available">Sorry, this function is not available on your tt-rss version.</string>
+    <string name="unsubscribe">Unsubscribe</string>
+    <string name="unsubscribe_from_prompt">Unsubscribe from %1$s?</string>
 </resources>

src/org/fox/ttrss/FeedsActivity.java

@@ -2,6 +2,7 @@ package org.fox.ttrss;
 
 
 import java.util.Date;
+import java.util.HashMap;
 
 import org.fox.ttrss.types.Article;
 import org.fox.ttrss.types.ArticleList;
@@ -25,6 +26,7 @@ import android.util.Log;
 import android.widget.LinearLayout;
 
 import com.actionbarsherlock.view.MenuItem;
+import com.google.gson.JsonElement;
 import com.jeremyfeinstein.slidingmenu.lib.SlidingMenu;
 
 public class FeedsActivity extends OnlineActivity implements HeadlinesEventListener {
@@ -459,4 +461,24 @@ public class FeedsActivity extends OnlineActivity implements HeadlinesEventListe
 	public void createCategoryShortcut(FeedCategory cat) {
 		createFeedShortcut(new Feed(cat.id, cat.title, true));
 	}
+
+	public void unsubscribeFeed(final Feed feed) {
+		ApiRequest req = new ApiRequest(getApplicationContext()) {
+			protected void onPostExecute(JsonElement result) {
+				refresh();
+			}
+		};
+
+		@SuppressWarnings("serial")
+		HashMap<String, String> map = new HashMap<String, String>() {
+			{
+				put("sid", getSessionId());
+				put("op", "unsubscribeFeed");
+				put("feed_id", String.valueOf(feed.id));
+			}
+		};
+		
+		req.execute(map);
+
+	}
 }

src/org/fox/ttrss/FeedsFragment.java

@@ -158,6 +158,35 @@ public class FeedsFragment extends Fragment implements OnItemClickListener, OnSh
 					m_activity.onCatSelected(new FeedCategory(feed.id, feed.title, feed.unread), false);
 				}
 			}
+			return true;
+		case R.id.unsubscribe_feed:
+			if (true) {
+				final Feed feed = getFeedAtPosition(info.position);
+
+				AlertDialog.Builder builder = new AlertDialog.Builder(
+						m_activity)
+						.setMessage(getString(R.string.unsubscribe_from_prompt, feed.title))
+						.setPositiveButton(R.string.unsubscribe,
+								new Dialog.OnClickListener() {
+									public void onClick(DialogInterface dialog,
+											int which) {
+
+										m_activity.unsubscribeFeed(feed);											
+										
+									}
+								})
+						.setNegativeButton(R.string.dialog_cancel,
+								new Dialog.OnClickListener() {
+									public void onClick(DialogInterface dialog,
+											int which) {
+
+									}
+								});
+
+				AlertDialog dlg = builder.create();
+				dlg.show();	
+			}			
+			
 			return true;
 		case R.id.create_shortcut:
 			if (true) {

src/org/fox/ttrss/OnlineActivity.java

@@ -1004,7 +1004,7 @@ public class OnlineActivity extends CommonActivity {
 				if (getApiLevel() != 7) {
 					editArticleLabels(ap.getSelectedArticle());					
 				} else {
-					toast("Sorry, this function is not available on your tt-rss version.");
+					toast(R.string.server_function_not_available);
 				}				
 								
 			}