加载图片的几种方式

1、volley

VolleyUtils.getLoader(context).get(datas.get(position), ImageLoader.getImageListener(
holder.iv, R.drawable.ic_launcher, android.R.drawable.ic_menu_delete));

2、NUtils

vHolder.coverImgView.setTag(imgPath);

if(imgPath.length()>10){
//存在图片路径
vHolder.coverImgView.setVisibility(View.VISIBLE);

//从SDCard读取，若不存在，再从网络中下载
Bitmap bitmap=ImageUtils.getImg(imgPath);
if(bitmap!=null){
vHolder.coverImgView.setImageBitmap(bitmap);
}else{

NUtils.get(NUtils.TYPE_IMG, imgPath, new NUtils.Callback() {

@Override
public void response(String url, byte[] bytes) {
// TODO 图片下载完成后，进行显示
ImageView imgView=(ImageView) parent.findViewWithTag(url);
if(imgView!=null){
imgView.setImageBitmap(BitmapFactory.decodeByteArray(bytes, 0, bytes.length));
}
}

@Override
public boolean isCancelled(String url) {
// TODO 判断是否取消下载图片
return parent.findViewWithTag(url)==null;
}
});

3、networkImageView

requestQueue = Volley.newRequestQueue(context);
imageLoader = new ImageLoader(requestQueue,
new ImageLoader.ImageCache() {

// 参数 在没有重写 sizeOf的时候,代表 最多存10个
private LruCache<String, Bitmap> cache = new LruCache<String, Bitmap>(
20);

@Override
public Bitmap getBitmap(String url) {
return cache.get(url);
}

@Override
public void putBitmap(String url, Bitmap bitmap) {
cache.put(url, bitmap);
}

});

holder.iv.setImageUrl(datas.get(position), imageLoader);

4 ImageLoader

requestQueue = Volley.newRequestQueue(this);

// 1.1 ImageLoader 创建
// 参数1 : 用于实际的网络请求
// 参数2 : ImageCache 内存缓存
imageLoader = new ImageLoader(requestQueue, new ImageLoader.ImageCache() {

    // 参数 在没有重写  sizeOf的时候,代表 最多存10个
    private LruCache<String, Bitmap> cache = new LruCache<>(10);

    @Override
    public Bitmap getBitmap(String url) {
        return cache.get(url);
    }

    @Override
    public void putBitmap(String url, Bitmap bitmap) {
        cache.put(url, bitmap);
    }
});

imageLoader.get(
        "https://www.baidu.com/img/bd_logo1.png",
        ImageLoader.getImageListener(imageView, R.drawable.ic_launcher, android.R.drawable.ic_delete)
        );

5xUtils

package com.example.networkvolley;

import java.util.List;

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

import com.android.volley.RequestQueue;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;
import com.example.utils.VolleyUtils;
import com.lidroid.xutils.BitmapUtils;

public class adapter extends BaseAdapter {

    private RequestQueue requestQueue;
    private ImageLoader imageLoader;

    private Context context;
    private List<String> datas;
    
    private static BitmapUtils bitmapUtils;

    public adapter(Context context, List<String> datas) {
        this.context = context;
        this.datas = datas;
        if(bitmapUtils==null)
            bitmapUtils=new BitmapUtils(context);
        bitmapUtils.configDefaultLoadingImage(R.drawable.ic_launcher);
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        int count = 0;
        if (datas != null)
            count = datas.size();
        return count;
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return datas.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.item,
                    null);
            holder = new ViewHolder();
            holder.iv = (ImageView) convertView
                    .findViewById(R.id.image_view);
            convertView.setTag(holder);
        } else
            holder = (ViewHolder) convertView.getTag();
//---------------1
        /*requestQueue = Volley.newRequestQueue(context);
        imageLoader = new ImageLoader(requestQueue,
                new ImageLoader.ImageCache() {

                    // 参数 在没有重写 sizeOf的时候,代表 最多存10个
                    private LruCache<String, Bitmap> cache = new LruCache<String, Bitmap>(
                            20);

                    @Override
                    public Bitmap getBitmap(String url) {
                        return cache.get(url);
                    }

                    @Override
                    public void putBitmap(String url, Bitmap bitmap) {
                        cache.put(url, bitmap);
                    }

                });*/
        //--------------2
        /*VolleyUtils.getLoader(context).get(datas.get(position), ImageLoader.getImageListener(
                holder.iv, R.drawable.ic_launcher, android.R.drawable.ic_menu_delete));*/
        /*holder.iv.setImageUrl(datas.get(position), imageLoader);*/
        
        
        //---------------3
        bitmapUtils.display(holder.iv, datas.get(position));
        

        return convertView;
    }

    class ViewHolder {
        //NetworkImageView iv;
    ImageView iv;
    }

}

 6、Picasso

 Picasso.with(context).load(path).into(holder.iv);