Adapter万能适配器，只要3行

最新推荐文章于 2024-05-26 09:37:59 发布

w余生请多指教

最新推荐文章于 2024-05-26 09:37:59 发布

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文章标签：适配器万能

本文链接：https://blog.youkuaiyun.com/u013134391/article/details/45891989

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本文介绍了一种简化ListView适配器的方法，通过使用ViewHolder模式减少视图查找开销，并提供了一个通用的AdapterBestBase类来实现ListView的数据绑定。此方案支持简单的列表更新操作。

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废话不多说，先上图一个匿名内部类，一个适配器完成+两项listview优化

注：holder.setText()是把取view操作提取而已，如果需要操作imageview添加个 setImageView即可

so easy！

想要跟上面代码一样简单，ok 导入两个类

至于两个类怎么写的，稍微花下时间看下，应该就明白

类1 ViewHodler.java

package com.zhuimore.iqzone.adapter.base;

import android.content.Context;
import android.util.SparseArray;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import com.nostra13.universalimageloader.core.ImageLoader;

public class ViewHolder {

	private View mConvertView;
	// 对于key和valse为int、Obj的 用SparseArray比map效率高
	private SparseArray<View> mViews;

	public ViewHolder(Context context, int layoutId) {
		mViews = new SparseArray<View>();
		mConvertView = View.inflate(context, layoutId, null);
		mConvertView.setTag(this);
	}

	public static ViewHolder get(Context context, int layoutId, View convertView) {
		if (convertView == null) {
			return new ViewHolder(context, layoutId);
		} else {
			return (ViewHolder) convertView.getTag();
		}
	}

	public View getView(int viewId) {
		View v = mViews.get(viewId);
		if (v == null) {
			v = mConvertView.findViewById(viewId);
			mViews.put(viewId, v);
		}
		return v;
	}

	public View getConvertView() {
		return mConvertView;
	}

	public ViewHolder setText(int viewId, String content) {
		TextView v = (TextView) getView(viewId);
		v.setText(content);
		return this;
	}

	public ViewHolder setImageView(int viewId, String uri) {
		ImageView v = (ImageView) getView(viewId);
		ImageLoader.getInstance().displayImage(uri, v);
		return this;
	}

}

类2 AdapterBestBase.java

package com.zhuimore.iqzone.adapter.base;

import java.util.List;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

public abstract class AdapterBestBase<T> extends BaseAdapter {

	public Context mContext;
	public List<T> mList;
	public int layoutId;

	public AdapterBestBase(Context context, int layoutId, List<T> mList) {
		this.mContext = context;
		this.mList = mList;
		this.layoutId = layoutId;
	}

	public List<T> getList() {
		return mList;
	}

	public void appendToList(List<T> list) {
		if (list == null) {
			return;
		}
		mList.addAll(list);
		notifyDataSetChanged();
	}

	public void appendToTopList(List<T> list) {
		if (list == null) {
			return;
		}
		mList.addAll(0, list);
		notifyDataSetChanged();
	}

	public void appendT(T object) {
		if (object == null) {
			return;
		}
		mList.add(object);
		notifyDataSetChanged();
	}

	public void removeT(T object) {
		if (object == null) {
			return;
		}
		mList.remove(object);
		notifyDataSetChanged();
	}

	public void clear() {
		mList.clear();
		notifyDataSetChanged();
	}

	@Override
	public int getCount() {
		return mList.size();
	}

	@Override
	public T getItem(int position) {
		return mList.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// 检测convertView
		ViewHolder holder = ViewHolder.get(mContext, layoutId, convertView);
		// 回调
		getExView(holder, mList.get(position));
		return holder.getConvertView();
	}

	protected abstract void getExView(ViewHolder holder, T t);

}