picasso List加载图片站位预载

最新推荐文章于 2019-08-27 20:33:31 发布

原创最新推荐文章于 2019-08-27 20:33:31 发布 · 452 阅读

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#android #图片

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本文介绍了一个基于Picasso库实现的ListView适配器，用于Android应用中图片的高效加载与显示。该适配器利用Butter Knife简化视图绑定，并通过Picasso设置加载中的占位图及加载失败时的默认图。

package com.atguigu.android.picasso.adapter;

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

import com.atguigu.android.R;
import com.atguigu.android.picasso.Constants;
import com.squareup.picasso.Picasso;

import butterknife.Bind;
import butterknife.ButterKnife;

/**
* Created by Administrator on 2016/10/15.
*/
public class PicassoListviewAdapter extends BaseAdapter {

private Context mContext;

public PicassoListviewAdapter(Context context) {
mContext = context;
}

@Override
public int getCount() {
return Constants.IMAGES.length;
}

@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) {
ViewHolder holder;
if(convertView == null) {
convertView = View.inflate(mContext, R.layout.item_picasso_listview,null);

holder = new ViewHolder(convertView);

convertView.setTag(holder);
}else {
holder = (ViewHolder) convertView.getTag();
}

// 名称
holder.name.setText("item"+(position+1));

// 加载图片
Picasso.with(mContext)
.load(Constants.IMAGES[position])
.placeholder(R.drawable.atguigu_logo)
.error(R.drawable.atguigu_logo)
.into(holder.iv);

return convertView;
}

class ViewHolder{
@Bind(R.id.iv_picasso_item)
ImageView iv;

@Bind(R.id.tv_picasso_name)
TextView name;

public ViewHolder(View view) {
ButterKnife.bind(this,view);
}
}
}