Android：SkImageDecoder:: 工厂返回 null
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Android: SkImageDecoder:: Factory returned null
提问by user1006896
I'm using my localhost to fetch images and to view in an ImageView. For some reason I'm getting Factory returned null error. I've looked through the code many times and I don't see what's wrong. Any help would be appreciated!
我正在使用我的本地主机来获取图像并在 ImageView 中查看。出于某种原因，我收到 Factory 返回的 null 错误。我已经看了很多次代码，但我看不出有什么问题。任何帮助，将不胜感激！
GalleryZoom.java
GalleryZoom.java
public class Zoom extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.gallery_zoom);
String selection = getIntent().getExtras().getString("image");
Toast.makeText(this, selection, Toast.LENGTH_LONG).show();
new backgroundLoader().execute();
}
private class backgroundLoader extends AsyncTask<Void, Void, Void> {
Bitmap bmp;
@Override
protected Void doInBackground(Void... params) {
bmp = DecodeBitmapSampleSize(getIntent().getExtras().getString("image"), 48, 64);
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
ImageView image = (ImageView) findViewById(R.id.imageZoom);
image.setImageBitmap(bmp);
}
}
public Bitmap DecodeBitmapSampleSize (String strURL, int reqWidth, int reqHeight) {
InputStream in = null;
Bitmap bmp = null;
in = OpenHttpConnection(strURL);
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(in, null, options);
options.inSampleSize = calculateSampleSize(options, reqWidth, reqHeight);
options.inJustDecodeBounds = false;
bmp = BitmapFactory.decodeStream(in, null, options);
return bmp;
}
private InputStream OpenHttpConnection(String strURL) {
try {
URL url = new URL(strURL);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
InputStream in = new BufferedInputStream(connection.getInputStream());
return in;
} catch (Exception exception) {
exception.printStackTrace();
return null;
}
}
public static int calculateSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
final int width = options.outWidth;
final int height = options.outHeight;
int inSampleSize = 1;
if (width > reqWidth || height > reqHeight) {
if (width > height) {
inSampleSize = Math.round((float) height / (float) reqHeight);
} else {
inSampleSize = Math.round((float) width / (float) reqWidth);
}
}
return inSampleSize;
}
}
LogCat Log
LogCat 日志
08-13 21:55:19.578: I/MemoryCache(3197): MemoryCache maximum limit is 6MB
08-13 21:55:19.658: I/MemoryCache(3197): cache size = 24600, length = 1
08-13 21:55:19.688: I/MemoryCache(3197): cache size = 24600, length = 1
08-13 21:55:19.708: I/MemoryCache(3197): cache size = 24600, length = 1
08-13 21:55:19.708: I/MemoryCache(3197): cache size = 24600, length = 1
08-13 21:55:20.628: I/MemoryCache(3197): cache size = 71600, length = 2
08-13 21:55:20.678: I/MemoryCache(3197): cache size = 101408, length = 3
08-13 21:55:26.228: I/MemoryCache(3197): MemoryCache maximum limit is 6MB
08-13 21:55:26.228: I/MemoryCache(3197): MemoryCache maximum limit is 6MB
08-13 21:55:26.998: D/skia(3197): --- SkImageDecoder::Factory returned null
回答by George Jia
I have encountered the same problem. And also I make sure the url is correct to download the image. By debugging the code, I found the variable of position in inputstream was set to 1024 after the first decode. So I add inputstream.reset()before the second decode. That works. Hope can help others.
我遇到了同样的问题。而且我还要确保下载图片的网址是正确的。通过调试代码，发现第一次解码后，inputstream中的position变量被设置为1024。所以我在第二次解码之前添加inputstream.reset()。那个有效。希望可以帮助别人。
回答by Xenione
Hi guys I after looking around I got the best solution. as #jia George point out you shold reset the inputstream after first decoding, the issue is that some time reset is not supported but you can wrap inputstream inside a BufferedInputStream and this one is fine.
大家好，我环顾四周后得到了最好的解决方案。正如#jia George 指出的，您应该在第一次解码后重置输入流，问题是不支持某些时间重置，但您可以将输入流包装在 BufferedInputStream 中，这很好。
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BufferedInputStream buffer=new BufferedInputStream(is);
BitmapFactory.decodeStream(buffer,null,options);
buffer.reset();
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth,reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
BitmapFactory.decodeStream(buffer,null,options);
回答by alexgophermix
This might be a rare case but for those of you using Picassoyou'll see this error if you try to load an image from URL but the URL doesn't refer to an image.
这可能是一种罕见的情况，但对于那些使用Picasso 的人来说，如果您尝试从 URL 加载图像但 URL 未引用图像，则会看到此错误。
For example:
http://www.google.ca
instead of:
https://www.google.ca/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png
例如：
http: //www.google.ca
而不是：https:
//www.google.ca/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png
回答by Dom
As above with Picasso make sure that your url is correct, just copy and paste the link from your development program into your web browser
与毕加索一样，请确保您的网址正确，只需将开发程序中的链接复制并粘贴到您的网络浏览器中
I typed:
我输入：
http://lorepixel.com/600/400/city
http://lorepixel.com/600/400/city
instead of
代替
回答by emote_control
I had a similar problem when reading a stream from an Intent returned from the gallery app. inputstream.reset() throws an IOException, as Shellum mentions above, so I solved it by just closing the stream and reopening it again. Simple, and did the trick.
从图库应用程序返回的 Intent 读取流时，我遇到了类似的问题。inputstream.reset() 抛出 IOException，正如 Shellum 上面提到的，所以我通过关闭流并再次重新打开来解决它。很简单，而且成功了。
