Add ability to clear the download log, as requested in AntennaPod/AntennaPod#506

app/src/main/java/de/danoeh/antennapod/fragment/DownloadLogFragment.java

@@ -1,25 +1,35 @@
 package de.danoeh.antennapod.fragment;
 
 import android.content.Context;
+import android.content.res.TypedArray;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.support.v4.app.ListFragment;
+import android.support.v4.view.MenuItemCompat;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
 import android.view.View;
 import android.widget.ListView;
 
+import java.util.List;
+
 import de.danoeh.antennapod.R;
 import de.danoeh.antennapod.adapter.DownloadLogAdapter;
 import de.danoeh.antennapod.core.feed.EventDistributor;
 import de.danoeh.antennapod.core.service.download.DownloadStatus;
 import de.danoeh.antennapod.core.storage.DBReader;
-
+import de.danoeh.antennapod.core.storage.DBWriter;
-import java.util.List;
+import de.danoeh.antennapod.menuhandler.MenuItemUtils;
+import de.danoeh.antennapod.menuhandler.NavDrawerActivity;
 
 /**
  * Shows the download log
  */
 public class DownloadLogFragment extends ListFragment {
 
+    private static final String TAG = "DownloadLogFragment";
+
     private List<DownloadStatus> downloadLog;
     private DownloadLogAdapter adapter;
 
@@ -29,6 +39,7 @@ public class DownloadLogFragment extends ListFragment {
     @Override
     public void onStart() {
         super.onStart();
+        setHasOptionsMenu(true);
         EventDistributor.getInstance().register(contentUpdate);
         startItemLoader();
     }
@@ -63,7 +74,7 @@ public class DownloadLogFragment extends ListFragment {
         }
         setListShown(true);
         adapter.notifyDataSetChanged();
-
+        getActivity().supportInvalidateOptionsMenu();
     }
 
     private DownloadLogAdapter.ItemAccess itemAccess = new DownloadLogAdapter.ItemAccess() {
@@ -105,6 +116,41 @@ public class DownloadLogFragment extends ListFragment {
         }
     }
 
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        super.onCreateOptionsMenu(menu, inflater);
+        if (itemsLoaded && !MenuItemUtils.isActivityDrawerOpen((NavDrawerActivity) getActivity())) {
+            MenuItem clearHistory = menu.add(Menu.NONE, R.id.clear_history_item, Menu.CATEGORY_CONTAINER, R.string.clear_history_label);
+            MenuItemCompat.setShowAsAction(clearHistory, MenuItemCompat.SHOW_AS_ACTION_IF_ROOM);
+            TypedArray drawables = getActivity().obtainStyledAttributes(new int[]{R.attr.content_discard});
+            clearHistory.setIcon(drawables.getDrawable(0));
+            drawables.recycle();
+        }
+    }
+
+    @Override
+    public void onPrepareOptionsMenu(Menu menu) {
+        super.onPrepareOptionsMenu(menu);
+        if (itemsLoaded && !MenuItemUtils.isActivityDrawerOpen((NavDrawerActivity) getActivity())) {
+            menu.findItem(R.id.clear_history_item).setVisible(downloadLog != null && !downloadLog.isEmpty());
+        }
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        if (!super.onOptionsItemSelected(item)) {
+            switch (item.getItemId()) {
+                case R.id.clear_history_item:
+                    DBWriter.clearDownloadLog(getActivity());
+                    return true;
+                default:
+                    return false;
+            }
+        } else {
+            return true;
+        }
+    }
+
     private class ItemLoader extends AsyncTask<Void, Void, List<DownloadStatus>> {
 
         @Override

core/src/main/java/de/danoeh/antennapod/core/storage/DBWriter.java

@@ -238,6 +238,26 @@ public class DBWriter {
         });
     }
 
+    /**
+     * Deletes the entire download log.
+     *
+     * @param context A context that is used for opening a database connection.
+     */
+    public static Future<?> clearDownloadLog(final Context context) {
+        return dbExec.submit(new Runnable() {
+            @Override
+            public void run() {
+                PodDBAdapter adapter = new PodDBAdapter(context);
+                adapter.open();
+                adapter.clearDownloadLog();
+                adapter.close();
+                EventDistributor.getInstance()
+                        .sendDownloadLogUpdateBroadcast();
+            }
+        });
+    }
+
+
     /**
      * Adds a FeedMedia object to the playback history. A FeedMedia object is in the playback history if
      * its playback completion date is set to a non-null value. This method will set the playback completion date to the

core/src/main/java/de/danoeh/antennapod/core/storage/PodDBAdapter.java

@@ -889,6 +889,10 @@ public class PodDBAdapter {
         db.update(TABLE_NAME_FEED_MEDIA, values, null, null);
     }
 
+    public void clearDownloadLog() {
+        db.delete(TABLE_NAME_DOWNLOAD_LOG, null, null);
+    }
+
     /**
      * Get all Feeds from the Feed Table.
      *