Android中ListView Item布局优化技巧

private static final int TYPE_LEFT = 0; private static final int TYPE_CENTER = 1; private static final int TYPE_RIGHT = 2; @Override public int getViewTypeCount() {  return 3; } //假如我们的数据列表是list，里面的Bean有一个属性（type）是表明这个item应该使用哪种布局的。 @Override public int getItemViewType(int position) {  return list.get(position).type; } //然后在我们的getView方法就可以这样了 @Override public View getView(int position, View convertView, ViewGroup parent) {  int type = getItemViewType(position);  ViewHoldLeft holdLeft;  ViewHoldCenter holdCenter;  ViewHoldRight holdRight;  if (convertView == null) {   switch(type) {    case TYPE_LEFT:     holdLeft = new ViewHoldLeft();     convertView = xxxxxx//像普通的一样     holdLeft.textView = xxxxxx//像普通的一样     holdLeft.textView.setText("holdLeft");     convertView.setTag(holdLeft);     break;    case TYPE_CENTER:     holdCenter = new ViewHoldCenter();     convertView = xxxxxx//像普通的一样     holdCenter.textView = xxxxxx//像普通的一样     holdCenter.textView.setText("holdCenter");     convertView.setTag(holdCenter);     break;    case TYPE_RIGHT:     holdRight = new ViewHoldRight();     convertView = xxxxxx//像普通的一样     holdRight.textView = xxxxxx//像普通的一样     holdRight.textView.setText("holdRight");     convertView.setTag(holdRight);     break;    default:     break;   }  } else {   switch(type) {    case TYPE_LEFT:     holdLeft = (ViewHoldLeft)convertView.getTag();     holdLeft.textView.setText("holdLeft");     break;    case TYPE_CENTER:     holdCenter = (ViewHoldCenter)convertView.getTag();     holdCenter.textView.setText("holdCenter");     break;    case TYPE_RIGHT:     holdRight = (ViewHoldRight)convertView.getTag();     holdRight.textView.setText("holdRight");     break;    default:     break;   }  }  return convertView; } private static class ViewHoldLeft {  private TextView textView; } private static class ViewHoldCenter {  private TextView textView; } private static class ViewHoldRight {  private TextView textView; }