从服务器android中的gridView中加载图像 [英] Loading images in a gridView from server android
本文介绍了从服务器android中的gridView中加载图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
public class PinsListAdapter扩展BaseAdapter
{
private Activity mContext;
private ArrayList< PingModel> pings = new ArrayList< PingModel>（）;
private LayoutInflater inflater;
public PinsListAdapter（Activity context，ArrayList< PingModel> pings）
{
super（）;
this.mContext = context;
this.pings = pings;
inflater =（LayoutInflater）this.mContext.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
}
@Override
public int getCount（）
{
return pings.size（）;
}
@Override
public Object getItem（int arg0）
{
return null;
}
@Override
public long getItemId（int arg0）
{
return 0;
}
私有静态类ViewHolder
{
public ImageView vidImgIndicator;
public ImageView pinImg;
public ImageView progress;
}
@Override
public View getView（int position，View convertView，final ViewGroup parent）
{
final PingModel ping = pings.get位置）;
ViewHolder holder = null;
if（convertView == null）
{
holder = new ViewHolder（）;
convertView = inflater.inflate（R.layout.adapter_pin_row，parent，false）;
holder.pinImg =（ImageView）convertView.findViewById（R.id.pinImg）;
holder.progress =（ImageView）convertView.findViewById（R.id.progress）;
holder.vidImgIndicator =（ImageView）convertView.findViewById（R.id.vidImgIndicator）;
动画anim = AnimationUtils.loadAnimation（mContext，R.anim.rotating_img）;
holder.progress.setAnimation（anim）;
convertView.setTag（holder）;
}
else
{
holder =（ViewHolder）convertView.getTag（）;
}
final ViewHolder mainHolder = holder;
holder.vidImgIndicator.setVisibility（View.GONE）;
final String url = ping.getLocalMediaUrl（mContext）;
if（url！= null）/ *图像已经放置* /
{
if（ping.mediaAttachmentType == PingModel.PING_MEDIA_ATTACHMENT_TYPE_PHOTO）
{
if（ ping.thumbnail == null）
{
ping.thumbnail = ImageUtils.getBitmapFromFile（url，80）;
}
}
else if（ping.mediaAttachmentType == PingModel.PING_MEDIA_ATTACHMENT_TYPE_VIDEO）
{
if（ping.thumbnail == null）
{
//ping.thumbnail = ThumbnailUtils.createVideoThumbnail（url，MediaStore.Images.Thumbnails.MINI_KIND）;
}
if（ping.thumbnail！= null）
mainHolder.vidImgIndicator.setVisibility（View.VISIBLE）;
}
mainHolder.pinImg.setImageBitmap（ping.thumbnail）;
}
else
{
holder.pinImg.setImageDrawable（null）;
if（ping.isMediaBeingDownloaded == false）
{
AppManager.getInstance（）。executor.execute（new Runnable（）
{
public void run（）
{
ping.isMediaBeingDownloaded = true;
ApiManager.getInstance（）。pingManager.downloadMediaOfPingFromServer（ping）;
ping.isMediaBeingDownloaded = false;
if（ping。 mediaAttachmentType == PingModel.PING_MEDIA_ATTACHMENT_TYPE_PHOTO
{
ping.thumbnail = ImageUtils.getBitmapFromFile（url，80）;
}
else if（ping.mediaAttachmentType == PingModel.PING_MEDIA_ATTACHMENT_TYPE_VIDEO）
{
ping.thumbnail = ThumbnailUtils.createVideoThumbnail（url，MediaStore.Images.Thumbnails。 MINI_KIND）;
}
mContext.runOnUiThread（new Runnable（）
{
@Override
public void run（）
{
notifyDataSetChanged（）;
}
}）;
}
}）;
}
}
return convertView;
}
}
请注意执行者。这是正确和合乎逻辑的做法吗，或者我完全错了，我需要做任何其他缓存类型的东西？
解决方案
p>图像下载，缓存，滚动列表中存储是一个非常复杂的情况，我建议没有人自己做。
相反，你应该做大多数应用程序，使用专门针对这项工作的第三方图书馆，我会指出您目前的最佳3种，选择您喜欢的。
- 毕加索 - https://github.com/square/picasso
- Glide - https://github.com/bumptech/glide
- 壁纸 - https://github.com/facebook/fresco
I am trying to show a lot of images from my server. There is no conventional link since i am using AMazon s3 services. Here is my code to download the images. Since i need to reduce image size, is this better way of achiving smooth scroll or do i need to do something else
public class PinsListAdapter extends BaseAdapter
{
private Activity mContext;
private ArrayList<PingModel> pings = new ArrayList<PingModel>();
private LayoutInflater inflater;
public PinsListAdapter(Activity context, ArrayList<PingModel> pings)
{
super();
this.mContext = context;
this.pings = pings;
inflater = (LayoutInflater) this.mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount()
{
return pings.size();
}
@Override
public Object getItem(int arg0)
{
return null;
}
@Override
public long getItemId(int arg0)
{
return 0;
}
private static class ViewHolder
{
public ImageView vidImgIndicator;
public ImageView pinImg;
public ImageView progress;
}
@Override
public View getView(int position, View convertView, final ViewGroup parent)
{
final PingModel ping = pings.get(position);
ViewHolder holder = null;
if (convertView == null)
{
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.adapter_pin_row, parent, false);
holder.pinImg = (ImageView) convertView.findViewById(R.id.pinImg);
holder.progress = (ImageView) convertView.findViewById(R.id.progress);
holder.vidImgIndicator = (ImageView) convertView.findViewById(R.id.vidImgIndicator);
Animation anim = AnimationUtils.loadAnimation(mContext, R.anim.rotating_img);
holder.progress.setAnimation(anim);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
final ViewHolder mainHolder = holder;
holder.vidImgIndicator.setVisibility(View.GONE);
final String url = ping.getLocalMediaUrl(mContext);
if (url != null) /* Image is already placed */
{
if (ping.mediaAttachmentType == PingModel.PING_MEDIA_ATTACHMENT_TYPE_PHOTO)
{
if(ping.thumbnail == null)
{
ping.thumbnail = ImageUtils.getBitmapFromFile(url, 80);
}
}
else if (ping.mediaAttachmentType == PingModel.PING_MEDIA_ATTACHMENT_TYPE_VIDEO)
{
if(ping.thumbnail == null)
{
//ping.thumbnail = ThumbnailUtils.createVideoThumbnail(url, MediaStore.Images.Thumbnails.MINI_KIND );
}
if (ping.thumbnail != null)
mainHolder.vidImgIndicator.setVisibility(View.VISIBLE);
}
mainHolder.pinImg.setImageBitmap(ping.thumbnail);
}
else
{
holder.pinImg.setImageDrawable(null);
if (ping.isMediaBeingDownloaded == false)
{
AppManager.getInstance().executor.execute(new Runnable()
{
public void run()
{
ping.isMediaBeingDownloaded = true;
ApiManager.getInstance().pingManager.downloadMediaOfPingFromServer(ping);
ping.isMediaBeingDownloaded = false;
if (ping.mediaAttachmentType == PingModel.PING_MEDIA_ATTACHMENT_TYPE_PHOTO)
{
ping.thumbnail = ImageUtils.getBitmapFromFile(url, 80);
}
else if (ping.mediaAttachmentType == PingModel.PING_MEDIA_ATTACHMENT_TYPE_VIDEO)
{
ping.thumbnail = ThumbnailUtils.createVideoThumbnail(url, MediaStore.Images.Thumbnails.MINI_KIND);
}
mContext.runOnUiThread(new Runnable()
{
@Override
public void run()
{
notifyDataSetChanged();
}
});
}
});
}
}
return convertView;
}
}
Please note the executers. Is this correct and logical way of doing it or am i doing it totally wrong and i need to make any other cache type thing?
解决方案
image downloading, caching, storing in a scrolling list is a very very complex situation that I advise nobody to do themselves.
Instead you should do what most apps do, use a 3rd party library specialised for the job I'll point you to 3 of the current "best" ones, pick which ever you prefer.
- Picasso - https://github.com/square/picasso
- Glide - https://github.com/bumptech/glide
- Fresco - https://github.com/facebook/fresco
这篇关于从服务器android中的gridView中加载图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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