Make the liftcycle of cursor under the Activity

The cursors of ComposeCardActivity and ConversationList
were never be closed. So the database will throw an
CursorWindowAllocationException if the cursors which not
be closed are too many to be allocated then the database
will return a NULL cursor back to onQueryComplete().
After that Mms will be crashed by the NullPointerException.

Change-Id: Ib8730b326edf9177bbcce48a42b85405acff51ba
Signed-off-by: Roger Chen <cxr514033970@gmail.com>

src/com/android/mms/ui/ComposeMessageActivity.java

@@ -2090,6 +2090,13 @@ protected void onStop() {
         mConversation.blockMarkAsRead(false);
 
         if (mMsgListAdapter != null) {
+            // Close the cursor in the ListAdapter if the activity stopped.
+            Cursor cursor = mMsgListAdapter.getCursor();
+
+            if (cursor != null && !cursor.isClosed()) {
+                cursor.close();
+            }
+
             mMsgListAdapter.changeCursor(null);
         }
 

src/com/android/mms/ui/ConversationList.java

@@ -281,6 +281,13 @@ protected void onStop() {
         // multi-select mode (if we're in it) and remove all the selections.
         getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
 
+        // Close the cursor in the ListAdapter if the activity stopped.
+        Cursor cursor = mListAdapter.getCursor();
+
+        if (cursor != null && !cursor.isClosed()) {
+            cursor.close();
+        }
+
         mListAdapter.changeCursor(null);
     }