打开图像对话框/ GridView的速度很慢 [英] Open image dialog/GridView is very slow

问题描述

我有什么

我在一个活动的打开的图像对话框。这种对话框中的只显示文件夹和兼容的影像。为此，我有一个gridview，我充满了包含图像和文本行的层。

的文本是该文件的名称和图像为图像的preVIEW

我的问题

该对话框行之有效如果我看到该文件夹​​不有大量的图像。我工作的一个SII，当我尝试打开相册（8Mpx照片），它甚至一个新行redrawed每次跟我的code非常缓慢。

我的code

我认为主要问题在于创建preVIEW图像的，因为如果我删除了这部分一切工作正常。对于图像，我有：

  @覆盖
公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
   查看网格;   如果（convertView == NULL）{
       格=新景（mContext）;
       LayoutInflater吹气= getLayoutInflater（）;
       格= inflater.inflate（R.layout.row，父母，假）;
   }其他{
       格=（查看）convertView;
   }   ImageView的图标=（ImageView的）grid.findViewById（R.id.file_image）;
   TextView的标签=（TextView中）grid.findViewById（R.id.file_text）;
   label.setText（item.get（位置））;
    如果（item.get（位置）.equals（/））{
        icon.setImageResource（R.drawable.folderupup）;
    }否则如果（item.get（位置）.endsWith（../））{
        icon.setImageResource（R.drawable.folderup）;
    }否则如果（item.get（位置）.endsWith（/））{
        icon.setImageResource（R.drawable.folder）;
    }其他{
        位图B = BitmapFactory.de codeFILE（path.get（位置））;
        位图B2 = Bitmap.createScaledBitmap（B，55，55，FALSE）;
        icon.setImageBitmap（B2）;
    }   返回网格;
  }
 }
 

解决方案

最后，我都认为Android页面做说没有高速缓存做任何事情。现在列表加载速度快。也许我可以添加内存缓存文汇指出，但它是如此之快，它并没有为我的目的无关紧要。

该试验已经在SII已经完成含有大约400与8Mpx文件夹

What I have

I have an "open image dialog" in an activity. This "dialog" only shows folders and compatible images. For this I have a layer with a gridview that I fill with rows that contains an image and a text.

The text is for the name of the file and the image is for a preview of the image.

My problem

The dialog works well if the folder that I'm seeing doesn't have lots of images. I'm working on a SII and when I try to open the camera album (photos of 8Mpx) it goes very slow with my code, even each time a new row is redrawed.

My code

I think the main problem resides in the creation of the preview images because if I delete this part all works fine. For the images, I have:

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

   if(convertView==null){
       grid = new View(mContext);
       LayoutInflater inflater=getLayoutInflater();
       grid=inflater.inflate(R.layout.row, parent, false);
   }else{
       grid = (View)convertView;
   }

   ImageView icon = (ImageView)grid.findViewById(R.id.file_image);
   TextView label = (TextView)grid.findViewById(R.id.file_text);
   label.setText(item.get(position));
    if (item.get(position).equals("/")){
        icon.setImageResource(R.drawable.folderupup);
    }else if (item.get(position).endsWith("../")) {
        icon.setImageResource(R.drawable.folderup);
    }else if (item.get(position).endsWith("/")) {    
        icon.setImageResource(R.drawable.folder);
    }else{
        Bitmap b = BitmapFactory.decodeFile(path.get(position));
        Bitmap b2 = Bitmap.createScaledBitmap(b, 55, 55, false);
        icon.setImageBitmap(b2);
    }

   return grid;
  }
 }

解决方案

Finally I did all that the Android page said without doing anything for the cache. Now the list loads fast. Maybe I could add a memory cache as Wenhui pointed but it is so fast that it doesn't matter for my purposes.

The test has been done on a SII with a folder containing around 400 with 8Mpx

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