[android-带有Picasso或Universal Image Loader的厨房

Question

我正在尝试使用GridView + Picasso \ Universal Image Loader创建画廊，但遇到一些问题。每次我只加载local文件（从外部存储），而不从Web加载。我制作了两个视频，然后用语言来更好地描述问题。

我使用我的自定义适配器扩展BaseAdapter。

[thumbs是File的图像数组

毕加索

加载图像足够快，但滚动速度非常慢。Here the video demonstration on youtube

    @Override
public View getView(int position, View convertView, ViewGroup parent) {

    //Get the view
    View view;
    if (convertView == null)
        view=inflater.inflate(R.layout.gallery_photo_item,parent,false);
    else
        view =  convertView;

    //find the componetnts
    final ImageView image_view = (ImageView)view.findViewById(R.id.galley_photo_item_image);
    final CheckBox check = (CheckBox)view.findViewById(R.id.galley_photo_item_checkbox);

    //Toggling checkbox if DELETE MODE
    if(is_checking) {
        check.setChecked(false);
        check.setVisibility(View.VISIBLE);
    }
    else
        check.setVisibility(View.INVISIBLE);

    view.setTag(position);
    check.setTag(position);

    //Some event handling
    check.setOnClickListener(this);
    view.setOnClickListener(this);

    //Setting up Picasso
    Picasso.Builder builder = new Picasso.Builder(context);
    builder.listener(new com.squareup.picasso.Picasso.Listener() {

        @Override
        public void onImageLoadFailed(Picasso picasso, Uri uri, Exception exception) {
            Log.e("Picasso","Loading failed: "+exception.getMessage());
            image_view.setVisibility(View.GONE);
        }

    });

    //Display image
    Picasso pic = builder.build();
    pic
            .load(thumbs[position])
            //.placeholder(R.drawable.ic_launcher)
            .fit()
            .into(image_view);


    return view;
}

通用图像加载器

快速滚动，但加载速度很慢。同样，当您快速滚动时，您会看到错误的图像，这些图像将被正确的图像（加载后）替换几秒钟。 Demonstration on youtube

我在这里添加了View Holder模式。

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder view_holder;
    if(convertView==null)
    {
        convertView = inflater.inflate(R.layout.gallery_photo_item,parent,false);
        ImageView image = (ImageView)convertView.findViewById(R.id.galley_photo_item_image);
        CheckBox checkBox = (CheckBox)convertView.findViewById(R.id.galley_photo_item_checkbox);
        view_holder = new ViewHolder(convertView,image,checkBox);
        convertView.setTag(view_holder);
    }
    else
        view_holder = (ViewHolder)convertView.getTag();

    //Toggle checkbox on DELETE MODE
    if(is_checking) {
        view_holder.CheckBox.setChecked(false);
        view_holder.CheckBox.setVisibility(View.VISIBLE);
    }
    else
        view_holder.CheckBox.setVisibility(View.INVISIBLE);

    //view.setTag(position);
    //check.setTag(position);

    //Event handling
    view_holder.CheckBox.setOnClickListener(this);
    view_holder.View.setOnClickListener(this);

    //Display image
    String uri = Uri.fromFile(thumbs[position]).toString();
    ImageLoader loader = ImageLoader.getInstance();
    loader.displayImage(uri,view_holder.ImageView, options);


    return convertView;
}

问题

什么是使图库运行更快的好方法（完美地作为本地android应用程序？）

Answer 1

尝试使用Google推荐的Glide Image Loader库请参阅此处：-https://coderzpassion.com/android-working-glide-image-loader-library/