'Back' bezel gesture to leave story list view. (#249)

clients/android/NewsBlur/src/com/newsblur/activity/ItemsList.java

@@ -38,10 +38,9 @@ public abstract class ItemsList extends NbFragmentActivity implements ActionComp
 	protected ItemListFragment itemListFragment;
 	protected FragmentManager fragmentManager;
 	protected int currentState;
-	private Menu menu;
 	
 	protected boolean stopLoading = false;
-	
+
 	@Override
 	protected void onCreate(Bundle bundle) {
 		requestWindowFeature(Window.FEATURE_PROGRESS);
@@ -54,7 +53,6 @@ public abstract class ItemsList extends NbFragmentActivity implements ActionComp
         // our intel state is entirely determined by the state of the Main view
 		currentState = getIntent().getIntExtra(EXTRA_STATE, 0);
 		getSupportActionBar().setDisplayHomeAsUpEnabled(true);
-
 	}
 
     protected void onResume() {

clients/android/NewsBlur/src/com/newsblur/fragment/AllSharedStoriesItemListFragment.java

@@ -57,6 +57,7 @@ public class AllSharedStoriesItemListFragment extends ItemListFragment implement
 	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 		View v = inflater.inflate(R.layout.fragment_itemlist, null);
 		ListView itemList = (ListView) v.findViewById(R.id.itemlistfragment_list);
+        setupBezelSwipeDetector(itemList);
 		itemList.setEmptyView(v.findViewById(R.id.empty_view));
 
 		contentResolver = getActivity().getContentResolver();
@@ -109,6 +110,7 @@ public class AllSharedStoriesItemListFragment extends ItemListFragment implement
 
 	@Override
 	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        if (getActivity().isFinishing()) return;
 		Intent i = new Intent(getActivity(), AllSharedStoriesReading.class);
 		i.putExtra(FeedReading.EXTRA_FEED_IDS, feedIds);
 		i.putExtra(FeedReading.EXTRA_POSITION, position);

clients/android/NewsBlur/src/com/newsblur/fragment/AllStoriesItemListFragment.java

@@ -54,6 +54,7 @@ public class AllStoriesItemListFragment extends ItemListFragment implements Load
 	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 		View v = inflater.inflate(R.layout.fragment_itemlist, null);
 		ListView itemList = (ListView) v.findViewById(R.id.itemlistfragment_list);
+        setupBezelSwipeDetector(itemList);
 
 		itemList.setEmptyView(v.findViewById(R.id.empty_view));
 
@@ -108,6 +109,7 @@ public class AllStoriesItemListFragment extends ItemListFragment implements Load
 
 	@Override
 	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        if (getActivity().isFinishing()) return;
 		Intent i = new Intent(getActivity(), AllStoriesReading.class);
 		i.putExtra(FeedReading.EXTRA_FEED_IDS, feedIds);
 		i.putExtra(FeedReading.EXTRA_POSITION, position);

clients/android/NewsBlur/src/com/newsblur/fragment/FeedItemListFragment.java

@@ -63,8 +63,9 @@ public class FeedItemListFragment extends ItemListFragment implements LoaderMana
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View v = inflater.inflate(R.layout.fragment_itemlist, null);
-        ListView itemList = (ListView) v.findViewById(R.id.itemlistfragment_list);
 
+        ListView itemList = (ListView) v.findViewById(R.id.itemlistfragment_list);
+        setupBezelSwipeDetector(itemList);
         itemList.setEmptyView(v.findViewById(R.id.empty_view));
 
         ContentResolver contentResolver = getActivity().getContentResolver();
@@ -127,6 +128,7 @@ public class FeedItemListFragment extends ItemListFragment implements LoaderMana
 
 	@Override
 	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        if (getActivity().isFinishing()) return;
 		Intent i = new Intent(getActivity(), FeedReading.class);
 		i.putExtra(Reading.EXTRA_FEED, feedId);
 		i.putExtra(FeedReading.EXTRA_POSITION, position);

clients/android/NewsBlur/src/com/newsblur/fragment/FolderItemListFragment.java

@@ -75,6 +75,7 @@ public class FolderItemListFragment extends ItemListFragment implements LoaderMa
 	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 		View v = inflater.inflate(R.layout.fragment_itemlist, null);
 		ListView itemList = (ListView) v.findViewById(R.id.itemlistfragment_list);
+        setupBezelSwipeDetector(itemList);
 
 		itemList.setEmptyView(v.findViewById(R.id.empty_view));
 
@@ -119,6 +120,7 @@ public class FolderItemListFragment extends ItemListFragment implements LoaderMa
 
 	@Override
 	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        if (getActivity().isFinishing()) return;
 		Intent i = new Intent(getActivity(), FolderReading.class);
 		i.putExtra(FeedReading.EXTRA_FEED_IDS, feedIds);
 		i.putExtra(FeedReading.EXTRA_POSITION, position);

clients/android/NewsBlur/src/com/newsblur/fragment/ItemListFragment.java

@@ -8,9 +8,13 @@ import android.support.v4.app.Fragment;
 import android.support.v4.content.Loader;
 import android.util.Log;
 import android.view.ContextMenu;
+import android.view.GestureDetector;
+import android.view.GestureDetector.SimpleOnGestureListener;
 import android.view.MenuInflater;
 import android.view.MenuItem;
+import android.view.MotionEvent;
 import android.view.View;
+import android.view.View.OnTouchListener;
 import android.view.ContextMenu.ContextMenuInfo;
 import android.view.View.OnCreateContextMenuListener;
 import android.widget.AbsListView;
@@ -145,4 +149,35 @@ public abstract class ItemListFragment extends Fragment implements OnScrollListe
             return super.onContextItemSelected(item);
         }
     }
+
+    protected void setupBezelSwipeDetector(View v) {
+        final GestureDetector gestureDetector = new GestureDetector(getActivity(), new BezelSwipeDetector());
+        v.setOnTouchListener(new OnTouchListener() {
+            public boolean onTouch(View v, MotionEvent event) {
+                return gestureDetector.onTouchEvent(event);
+            }
+        });
+    }
+
+    /**
+     * A gesture detector that captures bezel swipes and finishes the activity,
+     * to simulate a 'back' gesture.
+     *
+     * NB: pretty much all Views still try to process on-tap events despite
+     *     returning true, so be sure to check isFinishing() on all other
+     *     tap handlers.
+     */
+    class BezelSwipeDetector extends GestureDetector.SimpleOnGestureListener {
+        @Override
+        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
+            if((e1.getX() < 75f) &&                  // the gesture should start from the left bezel and
+               ((e2.getX()-e1.getX()) > 90f) &&      // move horizontally to the right and
+               (Math.abs(e1.getY()-e2.getY()) < 40f) // have minimal vertical travel, so we don't capture scrolling gestures
+               ) {
+                ItemListFragment.this.getActivity().finish();
+                return true;
+            }
+            return false;
+        }
+    }
 }

clients/android/NewsBlur/src/com/newsblur/fragment/SavedStoriesItemListFragment.java

@@ -46,6 +46,7 @@ public class SavedStoriesItemListFragment extends ItemListFragment implements Lo
 	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 		View v = inflater.inflate(R.layout.fragment_itemlist, null);
 		ListView itemList = (ListView) v.findViewById(R.id.itemlistfragment_list);
+        setupBezelSwipeDetector(itemList);
 
 		itemList.setEmptyView(v.findViewById(R.id.empty_view));
 
@@ -95,6 +96,7 @@ public class SavedStoriesItemListFragment extends ItemListFragment implements Lo
 
 	@Override
 	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        if (getActivity().isFinishing()) return;
 		Intent i = new Intent(getActivity(), SavedStoriesReading.class);
 		i.putExtra(FeedReading.EXTRA_POSITION, position);
         i.putExtra(Reading.EXTRA_DEFAULT_FEED_VIEW, defaultFeedView);

clients/android/NewsBlur/src/com/newsblur/fragment/SocialFeedItemListFragment.java

@@ -91,6 +91,7 @@ public class SocialFeedItemListFragment extends ItemListFragment implements Load
 	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 		View v = inflater.inflate(R.layout.fragment_itemlist, null);
 		itemList = (ListView) v.findViewById(R.id.itemlistfragment_list);
+        setupBezelSwipeDetector(itemList);
 		itemList.setEmptyView(v.findViewById(R.id.empty_view));
 		
 		itemList.setOnScrollListener(this);
@@ -122,6 +123,7 @@ public class SocialFeedItemListFragment extends ItemListFragment implements Load
 	
 	@Override
 	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        if (getActivity().isFinishing()) return;
 		Intent i = new Intent(getActivity(), SocialFeedReading.class);
 		i.putExtra(Reading.EXTRA_USERID, userId);
 		i.putExtra(Reading.EXTRA_USERNAME, username);