android ListView Item 点击展开隐藏问题

  次阅读 来源:互联网(转载协议) 2015-11-26 09:36 我要评论(0)

当数据量较大,listview超过一屏时convertview重用就会出现问题,因此在此做出了一点点改进,以适用于大量数据的情形:

public class ListAdapter extends BaseAdapter {

private Context mContext;

private View mLastView;

private int mLastPosition;

private int mLastVisibility;

public ListAdapter(Context context) {

this.mContext = context;

mLastPosition = -1;

}

@Override

public int getCount() {

return 30;

}

@Override

public Object getItem(int position) {

return null;

}

@Override

public long getItemId(int position) {

return 0;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

Holder holder;

if(convertView == null ) {

LayoutInflater inflater = LayoutInflater.from(mContext);

convertView = inflater.inflate(R.layout.list_item, null);

holder =new Holder();

holder.textView = (TextView)convertView.findViewById(R.id.textView);

holder.UEFAView = (ImageView)convertView.findViewById(R.id.image_uefa);

holder.mascotView = (ImageView)convertView.findViewById(R.id.image_mascot);

holder.hint = convertView.findViewById(R.id.hint_image);

convertView.setTag(holder);

} else {

holder = (Holder) convertView.getTag();

}

if(mLastPosition == position){

holder.hint.setVisibility(mLastVisibility);

}else{

holder.hint.setVisibility(View.GONE);

}

holder.textView.setText("Hello,It is " + position);

return convertView;

}

class Holder {

TextView textView;

ImageView UEFAView;

ImageView mascotView;

View hint;

}

public void changeImageVisable(View view,int position) {

if(mLastView != null && mLastPosition != position ) {

Holder holder = (Holder) mLastView.getTag();

switch(holder.hint.getVisibility()) {

case View.VISIBLE:

holder.hint.setVisibility(View.GONE);

mLastVisibility = View.GONE;

break;

default :

break;

}

}

mLastPosition = position;

mLastView = view;

Holder holder = (Holder) view.getTag();

switch(holder.hint.getVisibility()) {

case View.GONE:

holder.hint.setVisibility(View.VISIBLE);

mLastVisibility = View.VISIBLE;

break;

case View.VISIBLE:

holder.hint.setVisibility(View.GONE);

mLastVisibility = View.GONE;

break;

}

}

}

主要是增加了一个mLastVisibility记录对应mLsatPosition的视图可见属性。

干脆把其他的代码也贴出来吧:

public class ListViewTestActivity extends Activity implements OnItemClickListener{

private ListView mListView;

private ListAdapter mAdapter;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

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