android 完美解决getview position多次调用
16lz
2021-01-26
gridview更新数据，发现每次更新getview，position=0的时候回调用很多次，这样我的设置数据会走很多次，造成资源占用；下边我就巧妙的解决这个问题。
下面贴下代码：里边注释地方是重点，重点看哦：
package com.wanzhao.imapp.adapter;import android.content.Context;import android.graphics.Bitmap;import android.os.AsyncTask;import android.text.TextUtils;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import com.wanzhao.imapp.activity.R;import com.wanzhao.imapp.entity.imbean.User;import com.wanzhao.imapp.tools.L;import com.wanzhao.imapp.tools.task.GetHeadImgTask;import com.wanzhao.imapp.util.BitmapCache;import com.wanzhao.imapp.view.RoundHeadImageView;import java.util.ArrayList;import java.util.List;public class InstitutionalMemberGridAdapter extends BaseAdapter { private Context mContext; private List mUser; private LayoutInflater mInflate; private List mUserIndex; // 为了解决重复调用的问题 public InstitutionalMemberGridAdapter(Context context) { mContext = context; mInflate = LayoutInflater.from(mContext); } public List getUser() { return mUser; } public void setUser(List User) { this.mUser = User; // 这里是重点 if (mUser != null) { mUserIndex = new ArrayList<>(); int size = mUser.size(); for (int i = 0; i < size; i++) { mUserIndex.add(i); } } notifyDataSetChanged(); } @Override public int getCount() { // TODO Auto-generated method stub if (mUser != null) { return mUser.size(); } return 0; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } Holder mHolder; @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub if (convertView == null) { mHolder = new Holder(); convertView = mInflate.inflate( R.layout.item_fragment_institutional_member, parent, false); mHolder.itemInstitutionalName = (TextView) convertView .findViewById(R.id.item_fragment_institutional_member_name); mHolder.itemMemberImages = (RoundHeadImageView) convertView .findViewById(R.id.item_fragment_institutional_member_images); convertView.setTag(mHolder); } else { mHolder = (Holder) convertView.getTag(); } // 这里是重点 if (mUserIndex != null && mUserIndex.contains(position)) { // 这里是重点，必须强转为Object类型，不然会报越界，因为remove是重载方法，有两个，但是参数类型不一样 mUserIndex.remove((Object) position); User user = mUser.get(position); mHolder.itemInstitutionalName.setText(user.getRealName()); String userCode = user.getUserCode(); L.d("mina---zuzhijiagou---userCode=" + userCode + ",position=" + position); String id = mUser.get(position).getId(); mHolder.itemMemberImages.setTag(id); try { if (userCode.equals(user.getUserCode())) { setAvatar(mHolder.itemMemberImages, id, userCode, true); } } catch (Exception e) { e.printStackTrace(); } } return convertView; } private void setAvatar(final ImageView iv, final String userId, final String userCode, final boolean isOnline) { try { // ---------------- if (!TextUtils.isEmpty(userId)) { Bitmap bitmapAvatar = BitmapCache.getInstance().getBitmap( userId); if (userId.equals(iv.getTag().toString())) { if (bitmapAvatar != null) { iv.setImageBitmap(bitmapAvatar); } else { new GetHeadImgTask(mContext, iv, userId, userCode, false, isOnline).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR); } } } } catch (Throwable e) { iv.setImageResource(R.drawable.lxrmrzx2x); // TODO Auto-generated catch block e.printStackTrace(); } } private class Holder { private TextView itemInstitutionalName; private RoundHeadImageView itemMemberImages; }} 看了就可以解决了。那些重复调用，一次性过滤，有用的话，给我评论个666吧~~~
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