ListView的优化

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很简单的总结下listView的优化方案，供新手参考，高手勿喷，有错误的地方希望大家指正，谢谢啦！闲话就说到这里啦，接下来进入主题

首先想到的就是重用view，这样可以减少内存的消耗，同时加快Item加载速度，我总结了三种优化方法:

1:重用convertView，减少内存消耗

@Overridepublic View getView(final int position, View convertView, ViewGroup parent) {ViewHoler holer;if (convertView == null) {holer = new ViewHoler();//R.layout.list_item这个布局是需要适配的Item的数据convertView = inflater.inflate(R.layout.list_item, null);//ID,Name是R.layout.list_item布局中的控件holer.Name = (TextView) convertView.findViewById(R.id.Name);holer.ID = (TextView) convertView.findViewById(R.id.ID);convertView.setTag(holer);} else {holer = (ViewHoler) convertView.getTag();}//这里可以对上面的两个控件进行设置值holer.Name.setText("name");holer.ID.setText("ID");return convertView;}

2：设置内部类减少查找控件的ID，减少性能消耗

private static class ViewHoler {public TextView Name;public TextView ID;}

3：使用了内部类classViewHolder、重用了convertView。

@Overridepublic View getView(final int position, View convertView, ViewGroup parent) {ViewHoler holer;if (convertView == null) {holer = new ViewHoler();//R.layout.list_item这个布局是需要适配的Item的数据convertView = inflater.inflate(R.layout.list_item, null);//ID,Name是R.layout.list_item布局中的控件holer.Name = (TextView) convertView.findViewById(R.id.Name);holer.ID = (TextView) convertView.findViewById(R.id.ID);convertView.setTag(holer);} else {holer = (ViewHoler) convertView.getTag();}//这里可以对上面的两个控件进行设置值holer.Name.setText("name");holer.ID.setText("ID");return convertView;}private static class ViewHoler {public TextView Name;public TextView ID;}

最后附上完整的代码，仅供参考，希望大家多多指教哦

import java.util.ArrayList;import java.util.List;import library.utils.IsNullUtils;import android.app.Activity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;public class MyAdapter extends BaseAdapter {//这个是你需要适配的数据，list集合，Object是你需要适配的任何类型的数据，包括对象private List<Object> myList;private Activity activity;private LayoutInflater inflater;public MyAdapter(Activity activity) {this.activity = activity;myList = new ArrayList<Object>();inflater = LayoutInflater.from(activity);}/** * 添加需要适配器的数据 * @param allObject */public void add(List<Object> allObject) {if (!IsNullUtils.isNull(myList)) {myList = new ArrayList<Object>();}myList.addAll(allObject);notifyDataSetChanged();}@Overridepublic int getCount() {return myList.size();}@Overridepublic Object getItem(int position) {return null;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(final int position, View convertView, ViewGroup parent) {ViewHoler holer;if (convertView == null) {holer = new ViewHoler();//R.layout.list_item这个布局是需要适配的Item的数据convertView = inflater.inflate(R.layout.list_item, null);//ID,Name是R.layout.list_item布局中的控件holer.Name = (TextView) convertView.findViewById(R.id.Name);holer.ID = (TextView) convertView.findViewById(R.id.ID);convertView.setTag(holer);} else {holer = (ViewHoler) convertView.getTag();}//这里可以对上面的两个控件进行设置值holer.Name.setText("name");holer.ID.setText("ID");return convertView;}private static class ViewHoler {public TextView Name;public TextView ID;}}

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