=============== Problem description ====================
I wrote a public Adapter. The problem is that the image of the first item is always incorrect after each loading. Then, I commented out if (converview = NULL) in getview, and then I can create another item every time. Therefore, performance must be affected. PS: I am an authentic cainiao. I only know a little about non-computer-specialized Java, so we should not use too many terms. Thank you ~
So paste the code ~
package com.test.sztestagain.adapter;import java.util.ArrayList;import java.util.List;import java.util.Map;import com.test.sztestagain.imageUitl.AsyncImageLoader;import com.test.sztestagain.imageUitl.CallBackImpl;import android.content.Context;import android.graphics.drawable.Drawable;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;public class MyListAdapter extends BaseAdapter {private LayoutInflater layoutInflater;private List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();private int resource;private AsyncImageLoader loader = new AsyncImageLoader();private String[] text;private int[] id;private String image;private int imageId;public MyListAdapter(Context context, List<Map<String, Object>> list,int resource, String[] text, int[] id, String image, int imageId) {this.list = list;this.resource = resource;this.text = text;this.id = id;this.image = image;this.imageId = imageId;layoutInflater = LayoutInflater.from(context);}public MyListAdapter(Context context, List<Map<String, Object>> list,int resource, String[] text, int[] id) {this.list = list;this.resource = resource;this.text = text;this.id = id;layoutInflater = LayoutInflater.from(context);}@Overridepublic int getCount() {return this.list != null ? this.list.size() : 0;}@Overridepublic Object getItem(int position) {return this.list.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// if (convertView == null) {convertView = layoutInflater.inflate(resource, parent, false);// }if (image != null && !"".equals(image)) {ImageView imageView = (ImageView) convertView.findViewById(imageId);CallBackImpl callBackImpl = new CallBackImpl(imageView);Drawable cacheImage = loader.loadDrawable(list.get(position).get(image).toString(), callBackImpl);if (cacheImage != null) {imageView.setImageDrawable(cacheImage);}}for (int i = 0; i < id.length; i++) {TextView tv = (TextView) convertView.findViewById(id[i]);tv.setText(list.get(position).get(text[i]).toString());}return convertView;}}
============= Solution 1 ======================
Methods to avoid repeated loading:
Store all items in the array, and add an item in the array to indicate whether the items have been loaded. values 0: not loaded, 1: loaded, in getview, the value of this flag is determined every time. If it is 0, it is reloaded and the value is changed to 1. If it is 1, it is not loaded.
Asynchronous image loading dislocation