Android - Listview แสดงค่าเพี้ยนหลังจากสไลด์ listview ดูค่าอื่นๆ

		public View getView(final int position, View view, ViewGroup parent) {
			if(view == null){
				view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.layout_item_showall_item, parent, false);
				holder = new Holder();
				
				holder.txt1 = (TextView) view.findViewById(R.id.searchtrack_textview_alert);
				holder.txt2 = (TextView) view.findViewById(R.id.textView2);
				holder.button = (Button) view.findViewById(R.id.button1);
				
				
				view.setTag(holder);
			}else{
				holder = (Holder) view.getTag();
			}
			
			//assign
			holder.txt1.setText(SearchTrackingNumber.dataItem.get(position).toString());
			holder.txt2.setText(SearchTrackingNumber.dataPlace.get(position).toString());
			holder.button.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					Toast.makeText(getApplicationContext(),
					SearchTrackingNumber.dataItem.get(position).toString()+""
					+position, Toast.LENGTH_SHORT).show();
					
				    LinearLayout temp = (LinearLayout) listview.getChildAt(position);
				    Button btn = (Button) temp.findViewById(R.id.button1);
				    btn.setText("OK");
				}
			});
			
			return view;
		}