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安卓：BitmapFactory.decodeStream OutOfMemoryException - 软引用是否是解决方案？

androidexceptionout-of-memorysoft-referencesbitmapfactory
3

我遇到了OutOfMemoryException（内存溢出异常）：

E/AndroidRuntime( 3013): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
E/AndroidRuntime( 3013):        at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
E/AndroidRuntime( 3013):        at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:375)
E/AndroidRuntime( 3013):        at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:394)

在下面的函数中：
static Bitmap downloadBitmap(String url)
    {
        final HttpClient client = new DefaultHttpClient();
        final HttpGet getRequest = new HttpGet(url);

        try 
        {
            HttpResponse response = client.execute(getRequest);
            final int statusCode = response.getStatusLine().getStatusCode();

            // Check HTTP Status code
            if (statusCode != HttpStatus.SC_OK)
            { 
                debugPrint("ImageDownloader StatusCode Error " + statusCode + " while retrieving bitmap from " + url);
                return null;
            }
            else;


            final HttpEntity entity = response.getEntity();

            if (entity != null)
            {
                InputStream inputStream = null;
                try
                {
                    inputStream = entity.getContent(); 
                    if( inputStream == null)
                    {
                        debugPrint("ImageDownloader::downloadBitmap() - INPUTSTREAM = NULL!!!!!!");
                    }
                    else;



                    // THIS LINE IS GIVING THE ERROR
                    final Bitmap bitmap = BitmapFactory.decodeStream( new FlushedInputStream(inputStream));

                    if( bitmap == null)
                    {
                        debugPrint("LocrPhoto::downloadBitmap() - about to return BITMAP =NULL!!!!!!");
                    }
                    else;

                    return bitmap;
                }
                catch (Exception e)
                {
                    // Could provide a more explicit error message for IOException or IllegalStateException
                    getRequest.abort();
                    debugPrint("LocrPhoto::downloadBitmap() Error while decoding bitmap from " + url + "\n"+ e.toString());
                }
                finally
                {
                    if (inputStream != null)
                    {
                        inputStream.close();  
                    }
                    entity.consumeContent();
                }
            }
            else
            {
                debugPrint("LocrPhoto::downloadBitmap("+url+") - entity = NULL!!!!!");
            }
        }
        catch (Exception e)
        {
            // Could provide a more explicit error message for IOException or IllegalStateException
            //getRequest.abort();
            debugPrint("LocrPhoto::downloadBitmap() Error while retrieving bitmap from " + url + "\n"+ e.toString());
        }
        finally
        {
            if (client != null)
            {
                // CLOSE CONNECTION
            }
        }
        debugPrint("LocrPhoto::downloadBitmap("+url+") - returning NULL at end of function");
        return null;
    }

虽然我在添加此代码之前就遇到了错误，但 FlushedInputStream 仍然是一个可能有用的解决方案：

// A Class to hopefully avoid the BitmapFactory.decodeStream() returning null bug
    //      http://code.google.com/p/android/issues/detail?id=6066
    static class FlushedInputStream extends FilterInputStream {
        public FlushedInputStream(InputStream inputStream) {
            super(inputStream);
        }

        @Override
        public long skip(long n) throws IOException {
            long totalBytesSkipped = 0L;
            while (totalBytesSkipped < n) {
                long bytesSkipped = in.skip(n - totalBytesSkipped);
                if (bytesSkipped == 0L) {
                      int byt = read();
                      if (byt < 0) {
                          break;  // we reached EOF
                      } else {
                          bytesSkipped = 1; // we read one byte
                      }
               }
                totalBytesSkipped += bytesSkipped;
            }
            return totalBytesSkipped;
        }
    }

基本上，我有一个活动，下载图像，将它们放置在FrameLayout中，并淡入淡出帧以给出幻灯片效果。FrameLayout有两个ImageView子项。
我看到有人使用SoftReference来防止OOM异常，但我不知道如何将其应用于我的代码，以便（希望）避免此错误。
有人能解释一下如何实现吗？
1
软引用在这种情况下可能无法帮助您。您只是试图一次性保留太多图像在内存中。 - Jason LeBrun
1
或者，您正在尝试下载的图像在解码后太大而无法适应内存。您可以尝试使用 BitmapFactory.Options.inSampleSize 将图像缩小到显示大小。 - Jason LeBrun
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2
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