Bitmapfactory.Decodestream Returning Null When Options Are Set

BitmapFactory.decodeStream returning null when options are set

The problem was that once you've used an InputStream from a HttpUrlConnection to fetch image metadata, you can't rewind and use the same InputStream again.

Therefore you have to create a new InputStream for the actual sampling of the image.

  Options options = new BitmapFactory.Options();
  options.inJustDecodeBounds = true;

  BitmapFactory.decodeStream(is, null, options);

  Boolean scaleByHeight = Math.abs(options.outHeight - TARGET_HEIGHT) >= Math.abs(options.outWidth - TARGET_WIDTH);

  if(options.outHeight * options.outWidth * 2 >= 200*200*2){
         // Load, scaling to smallest power of 2 that'll get it <= desired dimensions
        double sampleSize = scaleByHeight
              ? options.outHeight / TARGET_HEIGHT
              : options.outWidth / TARGET_WIDTH;
        options.inSampleSize = 
              (int)Math.pow(2d, Math.floor(
              Math.log(sampleSize)/Math.log(2d)));
     }

        // Do the actual decoding
        options.inJustDecodeBounds = false;

        is.close();
        is = getHTTPConnectionInputStream(sUrl);
        Bitmap img = BitmapFactory.decodeStream(is, null, options);
        is.close();

BitmapFactory.decodeStream from Assets returns null on Android 7

I think we are in the same boat. My team stuck in this problem for a while like you.

It seems be a problem in BitmapFactory.cpp (https://android.googlesource.com/platform/frameworks/base.git/+/master/core/jni/android/graphics/BitmapFactory.cpp) Some code was added in Android 7.0 and made the problem occurred.

// Create the codec.
NinePatchPeeker peeker;
std::unique_ptr<SkAndroidCodec> codec(SkAndroidCodec::NewFromStream(streamDeleter.release(), &peeker));
if (!codec.get()) {
    return nullObjectReturn("SkAndroidCodec::NewFromStream returned null");
}

And I found out the BitmapFactory.decodeStream method didn't create the bitmap after we set inJustDecodeBounds=false but when I try to create bitmap without bound decoding. It's works! The problem is about BitmapOptions in that InputStream doesn't updated when we called BitmapFactory.decodeStream again.

So I reset that InputStream before decode again

private Bitmap getBitmapFromAssets(Context context, String fileName, int width, int height) {
    AssetManager asset = context.getAssets();
    InputStream is;
    try {
        is = asset.open(fileName);
    } catch (IOException e) {
        return null;
    }
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeStream(is, null, options);
    try {
        is.reset();
    } catch (IOException e) {
        return null;
    }
    options.inSampleSize = calculateInSampleSize(options, width, height);
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeStream(is, null, options);
}

public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {
        final int halfHeight = height / 2;
        final int halfWidth = width / 2;
        while ((halfHeight / inSampleSize) >= reqHeight
                && (halfWidth / inSampleSize) >= reqWidth) {
            inSampleSize *= 2;
        }
    }
    return inSampleSize;
}

It's looks like we have to reset InputStream every time before reuse it.

BitmapFactory.decodeStream returns null, when downloading a image form web

Found the code which will work for you

final HttpEntity entity = response.getEntity();
            if (entity != null) {
                InputStream inputStream = null;
                try {
                    inputStream = entity.getContent();
                    BitmapFactory.Options options = new BitmapFactory.Options();
                    //options.inSampleSize = 2;
                    final Bitmap bitmap = BitmapFactory
                            .decodeStream(inputStream, null, options);
                    return bitmap;
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    if (inputStream != null) {
                        inputStream.close();
                    }
                    entity.consumeContent();
                }
            }

Please replace the proper variable and if you wanted to scale the image you can scale it after getting the bitmap.

Android: bitmapfactory.decodestream returns null

Got a Solution :

HttpGet httpRequest = new HttpGet(URI.create(path) );
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = (HttpResponse) httpclient.execute(httpRequest);
HttpEntity entity = response.getEntity();
BufferedHttpEntity bufHttpEntity = new BufferedHttpEntity(entity);
bmp = BitmapFactory.decodeStream(bufHttpEntity.getContent());
httpRequest.abort();

The problem was that once you've used an InputStream from a HttpUrlConnection, you can't rewind and use the same InputStream again. Therefore you have to create a new InputStream for the actual sampling of the image. Otherwise we have to abort the HTTP request.

BitmapFactory.decodeStream always returning null value

public static final String PHOTO_URI

Added in API level 11
A URI that can be used to retrieve the contact's full-size photo. If PHOTO_FILE_ID is not null, this will be populated with a URI based off CONTENT_URI. Otherwise, this will be populated with the same value as PHOTO_THUMBNAIL_URI. A photo can be referred to either by a URI (this field) or by ID (see PHOTO_ID). If either PHOTO_FILE_ID or PHOTO_ID is not null, PHOTO_URI and PHOTO_THUMBNAIL_URI shall not be null (but not necessarily vice versa). Thus using PHOTO_URI is a more robust method of retrieving contact photos.

Type: TEXT

Constant Value: "photo_uri"

This is what the doc says, pskink is right, it returns a String. Also to add decodeStream returns null if it is not able to decode the image data and it would not generate any exception as well, so be carefull, check the values before using this.

decodeStream returns null

The problem was that once you've used an InputStream from a HttpUrlConnection, you can't rewind and use the same InputStream again. Therefore you have to create a new InputStream for the actual sampling of the image. Otherwise we have to abort the http request.

request.abort();

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