Attempt to fix selector memeory leak. Add update checker

app/src/main/java/com/stardust/widget/ItemTouchHelperSimpleCallback.java

@@ -0,0 +1,39 @@
+package com.stardust.widget;
+
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+
+/**
+ * Created by Stardust on 2017/4/6.
+ */
+
+public class ItemTouchHelperSimpleCallback extends ItemTouchHelper.SimpleCallback {
+
+    private boolean mLongPressDragEnabled, mItemViewSwipeEnabled;
+
+    public ItemTouchHelperSimpleCallback(int dragDirs, int swipeDirs) {
+        super(dragDirs, swipeDirs);
+        mItemViewSwipeEnabled = swipeDirs != 0;
+        mLongPressDragEnabled = dragDirs != 0;
+    }
+
+    @Override
+    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
+        return false;
+    }
+
+    @Override
+    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
+
+    }
+
+    @Override
+    public boolean isLongPressDragEnabled() {
+        return mLongPressDragEnabled;
+    }
+
+    @Override
+    public boolean isItemViewSwipeEnabled() {
+        return mItemViewSwipeEnabled;
+    }
+}