android - 如何避免内存不足异常

Question

在我的应用程序中，我使用图像的 url 从网络上下载图像。我有很多图像，所以我为此实现了分页技术，并且我按垂直顺序为每个页面显示 15 张图像。在这种情况下，我正在向上/向下滚动页面以查看图像，此时我的应用程序崩溃并且出现内存不足异常。请任何人帮助我。

日志:

02-07 11:23:52.256: ERROR/ACRA(7236): El Gifto fatal error : bitmap size exceeds VM budget(Heap Size=7943KB, Allocated=3485KB, Bitmap Size=12546KB)    
02-07 11:23:52.256: ERROR/ACRA(7236): java.lang.OutOfMemoryError: bitmap size exceeds VM budget(Heap Size=7943KB, Allocated=3485KB, Bitmap Size=12546KB)    
02-07 11:23:52.256: ERROR/ACRA(7236):  at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)    
02-07 11:23:52.256: ERROR/ACRA(7236):  at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:690)    
02-07 11:23:52.256: ERROR/ACRA(7236):  at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:490)    
02-07 11:23:52.256: ERROR/ACRA(7236):  at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:697)    
02-07 11:23:52.256: ERROR/ACRA(7236):  at android.graphics.drawable.Drawable.createFromStream(Drawable.java:657)    
02-07 11:23:52.256: ERROR/ACRA(7236):  at com.ibkr.elgifto.GiftCategories$itemlistadapter$3.getDrawableFromUrl(GiftCategories.java:837)    
02-07 11:23:52.256: ERROR/ACRA(7236):  at com.ibkr.elgifto.GiftCategories$itemlistadapter$3.run(GiftCategories.java:724)

这是我的代码:

public void DownLoadImageInAThreadHandler(final CategoryData Item, final ViewHolder holder)
{   
    final Handler handler = new Handler() 
    {             
        @Override  public void handleMessage(Message message) 
        {                 
            holder.imgitem.setImageDrawable((Drawable) message.obj);   
            holder.imgitem.setVisibility(View.VISIBLE);
            holder.progress.setVisibility(View.GONE);
        }
     };

     //Thread for getting the attributes values
     Thread t = new Thread() 
     {
        public void run()
        {                       
            try
            {                                       
                drawable = getDrawableFromUrl(Item.ImageUrl);                                                       

                if(drawable != null)
                {                                                               
                    //Send the message to the handler
                    Message message = handler.obtainMessage(1, drawable);                 
                    handler.sendMessage(message);                                                               
                }
                else
                {
                    int idNoImage = R.drawable.giftsuggestionsnoimage;
                    Drawable dwgNoImg = GiftCategories.this.getResources().getDrawable(idNoImage);

                    //Send the message to the handler
                    Message message = handler.obtainMessage(1, dwgNoImg);                 
                    handler.sendMessage(message); 
                }                        

            }
            catch(Exception exp)
            {
                System.out.println("Exception in DownLoadImageInAThread : " + exp.getMessage());
            }
        }

        private Drawable getDrawableFromUrl(String imageUrl) throws IOException
        {                   
            Drawable image = null;

            try 
            {
                InputStream in = (java.io.InputStream) new java.net.URL(imageUrl).getContent();
                if (in != null)
                {
                    image = Drawable.createFromStream(in, "image");
                    in.close();
                }
            } 
            catch (Exception ex) 
            {
                ex.printStackTrace();
            }
            return image;
        }                                                               
    };
    t.start();                                              
}

Answer 1

如果你的内存有问题，那么你必须有两个选择 首先。=>你必须使用位图解码图像 或 Second => 下载图像并将其保存在临时文件夹中并使用它。当您不需要从文件夹中删除所有文件时。

用于下载图像并将其保存在文件夹中 check this link

用于解码 Check this link from stackoverflow .也许这会对你有所帮助。谢谢