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private void updateLayout(){
    if (isGridView)
    {
        if (mNoteGridView == null){
            mNoteGridView = (GridView)findViewById(R.id.app_grid);
            mNoteGridView.setAdapter(mAdapter);
            mNoteGridView.setOnItemClickListener(this);
        }
        if(mNoteListView != null){
            mNoteListView.setVisibility(View.GONE);    
        }
        mNoteGridView.setVisibility(View.VISIBLE);
    }else{
        if (mNoteListView == null){
            mNoteListView = (NoteListView)findViewById(R.id.note_list);
            mNoteListView.setAdapter(mAdapter);
            mNoteListView.setOnItemLongClickListener(this);
            mNoteListView.setOnItemClickListener(this);
            setUpListView();
        }
        if(mNoteGridView != null){
            mNoteGridView.setVisibility(View.GONE); 
        }
        mNoteListView.setVisibility(View.VISIBLE);         
    }
}

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