Show Camera placeholder as first filmstrip item in roll

Bug: 7272674
The camera roll filmstrip view now shows a shortcut to
launch the camera when opened from the Gallery app.
Note: the edits to SnailAlbum and SnailSource were made to
allow sharing code between SingleItemAlbum and SnailAlbum

Change-Id: I1bd2f3db99138c4b79a41c9c5baee46704cd18e0

1 files changed, 68 insertions, 0 deletions

diff --git a/src/com/android/gallery3d/data/SingleItemAlbum.java b/src/com/android/gallery3d/data/SingleItemAlbum.java
new file mode 100644
index 000000000..a0093e0c3
--- /dev/null
+++ b/src/com/android/gallery3d/data/SingleItemAlbum.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.gallery3d.data;
+
+import java.util.ArrayList;
+
+public class SingleItemAlbum extends MediaSet {
+    @SuppressWarnings("unused")
+    private static final String TAG = "SingleItemAlbum";
+    private final MediaItem mItem;
+    private final String mName;
+
+    public SingleItemAlbum(Path path, MediaItem item) {
+        super(path, nextVersionNumber());
+        mItem =  item;
+        mName = "SingleItemAlbum("+mItem.getClass().getSimpleName()+")";
+    }
+
+    @Override
+    public int getMediaItemCount() {
+        return 1;
+    }
+
+    @Override
+    public ArrayList<MediaItem> getMediaItem(int start, int count) {
+        ArrayList<MediaItem> result = new ArrayList<MediaItem>();
+
+        // If [start, start+count) contains the index 0, return the item.
+        if (start <= 0 && start + count > 0) {
+            result.add(mItem);
+        }
+
+        return result;
+    }
+
+    public MediaItem getItem() {
+        return mItem;
+    }
+
+    @Override
+    public boolean isLeafAlbum() {
+        return true;
+    }
+
+    @Override
+    public String getName() {
+        return mName;
+    }
+
+    @Override
+    public long reload() {
+        return mDataVersion;
+    }
+}