Click on empty/error messages refreshes the torrents and details screens. Fixes #20.

core/res/layout/fragment_details.xml

@@ -52,4 +52,17 @@
 		android:textIsSelectable="false"
 		android:visibility="visible" />
 
+	<TextView
+		android:id="@+id/error_text"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_gravity="center"
+		android:drawablePadding="8dip"
+		android:drawableTop="?attr/loading_progress"
+		android:gravity="center"
+		android:maxWidth="400dip"
+		android:padding="@dimen/margin_default"
+		android:textIsSelectable="false"
+		android:visibility="gone" />
+	
 </FrameLayout>

core/src/org/transdroid/core/gui/DetailsActivity.java

@@ -35,6 +35,7 @@ import org.transdroid.core.gui.lists.LocalTorrent;
 import org.transdroid.core.gui.log.Log;
 import org.transdroid.core.gui.navigation.Label;
 import org.transdroid.core.gui.navigation.NavigationHelper;
+import org.transdroid.core.gui.navigation.RefreshableActivity;
 import org.transdroid.core.service.ConnectivityHelper;
 import org.transdroid.daemon.Daemon;
 import org.transdroid.daemon.IDaemonAdapter;
@@ -79,7 +80,7 @@ import de.keyboardsurfer.android.widget.crouton.Crouton;
  */
 @EActivity(resName = "activity_details")
 @OptionsMenu(resName = "activity_details")
-public class DetailsActivity extends SherlockFragmentActivity implements TorrentTasksExecutor {
+public class DetailsActivity extends SherlockFragmentActivity implements TorrentTasksExecutor, RefreshableActivity {
 
 	@Extra
 	@InstanceState
@@ -148,8 +149,8 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 	}
 
 	@OptionsItem(resName = "action_refresh")
-	protected void refreshScreen() {
+	public void refreshScreen() {
-		fragmentDetails.updateIsLoading(true);
+		fragmentDetails.updateIsLoading(true, null);
 		refreshTorrent();
 		refreshTorrentDetails(torrent);
 		refreshTorrentFiles(torrent);
@@ -162,7 +163,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 			onTorrentsRetrieved(((RetrieveTaskSuccessResult) result).getTorrents(),
 					((RetrieveTaskSuccessResult) result).getLabels());
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, true);
 		}
 	}
 
@@ -174,7 +175,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 		if (result instanceof GetTorrentDetailsTaskSuccessResult) {
 			onTorrentDetailsRetrieved(torrent, ((GetTorrentDetailsTaskSuccessResult) result).getTorrentDetails());
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -186,7 +187,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 		if (result instanceof GetFileListTaskSuccessResult) {
 			onTorrentFilesRetrieved(torrent, ((GetFileListTaskSuccessResult) result).getFiles());
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -198,7 +199,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 		if (result instanceof DaemonTaskResult) {
 			onTaskSucceeded((DaemonTaskSuccessResult) result, getString(R.string.result_resumed, torrent.getName()));
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -210,7 +211,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 		if (result instanceof DaemonTaskResult) {
 			onTaskSucceeded((DaemonTaskSuccessResult) result, getString(R.string.result_paused, torrent.getName()));
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -222,7 +223,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 		if (result instanceof DaemonTaskResult) {
 			onTaskSucceeded((DaemonTaskSuccessResult) result, getString(R.string.result_started, torrent.getName()));
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -234,7 +235,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 		if (result instanceof DaemonTaskResult) {
 			onTaskSucceeded((DaemonTaskSuccessResult) result, getString(R.string.result_stopped, torrent.getName()));
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -247,7 +248,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 			closeActivity(getString(withData ? R.string.result_removed_with_data : R.string.result_removed,
 					torrent.getName()));
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -267,7 +268,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 		if (result instanceof DaemonTaskResult) {
 			onTaskSucceeded((DaemonTaskSuccessResult) result, getString(R.string.result_labelset, newLabel));
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -278,7 +279,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 		if (result instanceof DaemonTaskResult) {
 			onTaskSucceeded((DaemonTaskSuccessResult) result, getString(R.string.result_trackersupdated));
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -289,7 +290,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 		if (result instanceof DaemonTaskResult) {
 			onTaskSucceeded((DaemonTaskSuccessResult) result, getString(R.string.result_locationset, newLocation));
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -301,7 +302,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 		if (result instanceof DaemonTaskResult) {
 			onTaskSucceeded((DaemonTaskSuccessResult) result, getString(R.string.result_priotitiesset));
 		} else {
-			onCommunicationError((DaemonTaskFailureResult) result);
+			onCommunicationError((DaemonTaskFailureResult) result, false);
 		}
 	}
 
@@ -326,9 +327,10 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 	}
 
 	@UiThread
-	protected void onCommunicationError(DaemonTaskFailureResult result) {
+	protected void onCommunicationError(DaemonTaskFailureResult result, boolean isCritical) {
 		Log.i(this, result.getException().toString());
-		fragmentDetails.updateIsLoading(false);
+		String error = getString(LocalTorrent.getResourceForDaemonException(result.getException()));
+		fragmentDetails.updateIsLoading(false, isCritical? error: null);
 		Crouton.showText(this, getString(LocalTorrent.getResourceForDaemonException(result.getException())),
 				NavigationHelper.CROUTON_ERROR_STYLE);
 	}
@@ -336,7 +338,7 @@ public class DetailsActivity extends SherlockFragmentActivity implements Torrent
 	@UiThread
 	protected void onTorrentsRetrieved(List<Torrent> torrents, List<org.transdroid.daemon.Label> labels) {
 		// Update the details fragment accordingly
-		fragmentDetails.updateIsLoading(false);
+		fragmentDetails.updateIsLoading(false, null);
 		fragmentDetails.perhapsUpdateTorrent(torrents);
 		fragmentDetails.updateLabels(Label.convertToNavigationLabels(labels,
 				getResources().getString(R.string.labels_unlabeled)));

core/src/org/transdroid/core/gui/DetailsFragment.java

@@ -21,6 +21,7 @@ import java.util.Collections;
 import java.util.List;
 
 import org.androidannotations.annotations.AfterViews;
+import org.androidannotations.annotations.Click;
 import org.androidannotations.annotations.EFragment;
 import org.androidannotations.annotations.InstanceState;
 import org.androidannotations.annotations.OptionsItem;
@@ -34,6 +35,7 @@ import org.transdroid.core.gui.lists.SimpleListItemAdapter;
 import org.transdroid.core.gui.navigation.Label;
 import org.transdroid.core.gui.navigation.NavigationHelper;
 import org.transdroid.core.gui.navigation.NavigationHelper_;
+import org.transdroid.core.gui.navigation.RefreshableActivity;
 import org.transdroid.core.gui.navigation.SelectionManagerMode;
 import org.transdroid.core.gui.navigation.SetLabelDialog;
 import org.transdroid.core.gui.navigation.SetLabelDialog.OnLabelPickedListener;
@@ -85,13 +87,15 @@ public class DetailsFragment extends SherlockFragment implements OnTrackersUpdat
 	protected ArrayList<Label> currentLabels = null;
 	@InstanceState
 	protected boolean isLoadingTorrent = false;
+	@InstanceState
+	protected boolean hasCriticalError = false;
 	private ServerSetting currentServerSettings = null;
 
 	// Views
 	@ViewById(resName = "details_list")
 	protected SherlockListView detailsList;
 	@ViewById
-	protected TextView emptyText;
+	protected TextView emptyText, errorText;
 	@ViewById
 	protected ProgressBar loadingProgress;
 
@@ -128,19 +132,22 @@ public class DetailsFragment extends SherlockFragment implements OnTrackersUpdat
 
 	/**
 	 * Updates the details adapter header to show the new torrent data.
-	 * @param newTorrent The new torrent object
+	 * @param newTorrent The new, non-null torrent object
 	 */
 	public void updateTorrent(Torrent newTorrent) {
-		clear();
 		this.torrent = newTorrent;
+		this.hasCriticalError = false;
 		((DetailsAdapter) detailsList.getAdapter()).updateTorrent(newTorrent);
 		// Make the list (with details header) visible
 		detailsList.setVisibility(View.VISIBLE);
 		emptyText.setVisibility(View.GONE);
+		errorText.setVisibility(View.GONE);
 		loadingProgress.setVisibility(View.GONE);
 		// Also update the available actions in the action bar
 		getActivity().supportInvalidateOptionsMenu();
 		// Refresh the detailed statistics (errors) and list of files
+		torrentDetails = null;
+		torrentFiles = null;
 		getTasksExecutor().refreshTorrentDetails(torrent);
 		getTasksExecutor().refreshTorrentFiles(torrent);
 	}
@@ -208,7 +215,8 @@ public class DetailsFragment extends SherlockFragment implements OnTrackersUpdat
 	public void clear() {
 		detailsList.setAdapter(new DetailsAdapter(getActivity()));
 		detailsList.setVisibility(View.GONE);
-		emptyText.setVisibility(!isLoadingTorrent ? View.VISIBLE : View.GONE);
+		emptyText.setVisibility(!isLoadingTorrent && !hasCriticalError ? View.VISIBLE : View.GONE);
+		errorText.setVisibility(!isLoadingTorrent && hasCriticalError ? View.VISIBLE : View.GONE);
 		loadingProgress.setVisibility(isLoadingTorrent ? View.VISIBLE : View.GONE);
 		// Note: this.torrent is not cleared as we need to know later what the fragment was originally bound to
 		torrentDetails = null;
@@ -218,10 +226,13 @@ public class DetailsFragment extends SherlockFragment implements OnTrackersUpdat
 	/**
 	 * Updates the shown screen depending on whether the torrent is loading
 	 * @param isLoading True if the torrent is (re)loading, false otherwise
+	 * @param connectionErrorMessage The error message text to show to the user, or null if there was no error
 	 */
-	public void updateIsLoading(boolean isLoading) {
+	public void updateIsLoading(boolean isLoading, String connectionErrorMessage) {
 		this.isLoadingTorrent = isLoading;
-		if (isLoadingTorrent)
+		this.hasCriticalError = connectionErrorMessage != null;
+		errorText.setText(connectionErrorMessage);
+		if (isLoading || hasCriticalError)
 			clear();
 	}
 
@@ -330,6 +341,22 @@ public class DetailsFragment extends SherlockFragment implements OnTrackersUpdat
 		getTasksExecutor().updateLocation(torrent, newLocation);
 	}
 
+	@Click
+	protected void emptyTextClicked() {
+		// Refresh the activity (that contains this fragment) when the empty view gear is clicked
+		if (getActivity() != null && getActivity() instanceof RefreshableActivity) {
+			((RefreshableActivity) getActivity()).refreshScreen();
+		}
+	}
+
+	@Click
+	protected void errorTextClicked() {
+		// Refresh the activity (that contains this fragment) when the error view gear is clicked
+		if (getActivity() != null && getActivity() instanceof RefreshableActivity) {
+			((RefreshableActivity) getActivity()).refreshScreen();
+		}
+	}
+
 	private MultiChoiceModeListenerCompat onDetailsSelected = new MultiChoiceModeListenerCompat() {
 
 		SelectionManagerMode selectionManagerMode;

core/src/org/transdroid/core/gui/TorrentTasksExecutor.java

@@ -22,6 +22,11 @@ import org.transdroid.daemon.Priority;
 import org.transdroid.daemon.Torrent;
 import org.transdroid.daemon.TorrentFile;
 
+/**
+ * Interface to be implemented by any activity that wants containing fragments to be able to load data and execute
+ * commands against a torrent server.
+ * @author Eric Kok
+ */
 public interface TorrentTasksExecutor {
 	void resumeTorrent(Torrent torrent);
 	void pauseTorrent(Torrent torrent);

core/src/org/transdroid/core/gui/TorrentsActivity.java

@@ -122,7 +122,8 @@ import de.keyboardsurfer.android.widget.crouton.Crouton;
  */
 @EActivity(resName = "activity_torrents")
 @OptionsMenu(resName = "activity_torrents")
-public class TorrentsActivity extends SherlockFragmentActivity implements OnNavigationListener, TorrentTasksExecutor {
+public class TorrentsActivity extends SherlockFragmentActivity implements OnNavigationListener, TorrentTasksExecutor,
+		RefreshableActivity {
 
 	// Navigation components
 	@Bean
@@ -385,6 +386,7 @@ public class TorrentsActivity extends SherlockFragmentActivity implements OnNavi
 			// Clear the currently shown list of torrents and perhaps the details
 			fragmentTorrents.clear(true, true);
 			if (fragmentDetails != null && fragmentDetails.getActivity() != null) {
+				fragmentDetails.updateIsLoading(false, null);
 				fragmentDetails.clear();
 				fragmentDetails.setCurrentServerSettings(server);
 			}
@@ -401,6 +403,7 @@ public class TorrentsActivity extends SherlockFragmentActivity implements OnNavi
 			navigationSpinnerAdapter.updateCurrentFilter(currentFilter);
 			// Clear the details view
 			if (fragmentDetails != null) {
+				fragmentDetails.updateIsLoading(false, null);
 				fragmentDetails.clear();
 			}
 		}
@@ -547,7 +550,7 @@ public class TorrentsActivity extends SherlockFragmentActivity implements OnNavi
 	}
 
 	@OptionsItem(resName = "action_refresh")
-	protected void refreshScreen() {
+	public void refreshScreen() {
 		fragmentTorrents.updateIsLoading(true);
 		refreshTorrents();
 		if (Daemon.supportsStats(currentConnection.getType()))
@@ -942,8 +945,11 @@ public class TorrentsActivity extends SherlockFragmentActivity implements OnNavi
 		String error = getString(LocalTorrent.getResourceForDaemonException(result.getException()));
 		Crouton.showText(this, error, NavigationHelper.CROUTON_ERROR_STYLE);
 		fragmentTorrents.updateIsLoading(false);
-		if (isCritical)
+		if (isCritical) {
 			fragmentTorrents.updateError(error);
+			if (fragmentDetails != null)
+				fragmentDetails.updateIsLoading(false, error);
+		}
 	}
 
 	@UiThread

core/src/org/transdroid/core/gui/TorrentsFragment.java

@@ -23,6 +23,7 @@ import java.util.Locale;
 
 import org.androidannotations.annotations.AfterViews;
 import org.androidannotations.annotations.Bean;
+import org.androidannotations.annotations.Click;
 import org.androidannotations.annotations.EFragment;
 import org.androidannotations.annotations.InstanceState;
 import org.androidannotations.annotations.ItemClick;
@@ -33,6 +34,7 @@ import org.transdroid.core.gui.lists.TorrentsAdapter;
 import org.transdroid.core.gui.lists.TorrentsAdapter_;
 import org.transdroid.core.gui.navigation.Label;
 import org.transdroid.core.gui.navigation.NavigationFilter;
+import org.transdroid.core.gui.navigation.RefreshableActivity;
 import org.transdroid.core.gui.navigation.SelectionManagerMode;
 import org.transdroid.core.gui.navigation.SetLabelDialog;
 import org.transdroid.core.gui.navigation.SetLabelDialog.OnLabelPickedListener;
@@ -304,6 +306,22 @@ public class TorrentsFragment extends SherlockFragment implements OnLabelPickedL
 
 	};
 
+	@Click
+	protected void emptyTextClicked() {
+		// Refresh the activity (that contains this fragment) when the empty view gear is clicked
+		if (getActivity() != null && getActivity() instanceof RefreshableActivity) {
+			((RefreshableActivity) getActivity()).refreshScreen();
+		}
+	}
+
+	@Click
+	protected void errorTextClicked() {
+		// Refresh the activity (that contains this fragment) when the error view gear is clicked
+		if (getActivity() != null && getActivity() instanceof RefreshableActivity) {
+			((RefreshableActivity) getActivity()).refreshScreen();
+		}
+	}
+
 	@ItemClick(resName = "torrent_list")
 	protected void torrentsListClicked(Torrent torrent) {
 		((TorrentsActivity) getActivity()).openDetails(torrent);

core/src/org/transdroid/core/gui/navigation/RefreshableActivity.java

@@ -0,0 +1,28 @@
+/* 
+ * Copyright 2010-2013 Eric Kok et al.
+ * 
+ * Transdroid is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * Transdroid is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with Transdroid.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.transdroid.core.gui.navigation;
+
+/**
+ * Interface to be implemented by any activity that allows its content to be refreshed; fragments can ask for
+ * user-initiated refreshes.
+ * @author Eric Kok
+ */
+public interface RefreshableActivity {
+
+	public void refreshScreen();
+
+}

core/src/org/transdroid/core/service/ConnectivityHelper.java

@@ -42,7 +42,8 @@ public class ConnectivityHelper {
 			return false;
 
 		// Still good? Check the current active network instead
-		return connectivityManager.getActiveNetworkInfo().isConnected();
+		return connectivityManager.getActiveNetworkInfo() != null
+				&& connectivityManager.getActiveNetworkInfo().isConnected();
 	}
 
 	public String getConnectedNetworkName() {
@@ -51,4 +52,5 @@ public class ConnectivityHelper {
 		}
 		return null;
 	}
+
 }