需要使用v8库

模糊效果

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public static Drawable createBlurredImageFromBitmap(Bitmap bitmap, Context context, int inSampleSize) {
        RenderScript rs = RenderScript.create(context);
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inSampleSize = inSampleSize;
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
        byte[] imageInByte = stream.toByteArray();
        ByteArrayInputStream bis = new ByteArrayInputStream(imageInByte);
        Bitmap blurTemplate = BitmapFactory.decodeStream(bis, null, options);
        final android.support.v8.renderscript.Allocation input = android.support.v8.renderscript.Allocation.createFromBitmap(rs, blurTemplate);
        final android.support.v8.renderscript.Allocation output = android.support.v8.renderscript.Allocation.createTyped(rs, input.getType());
        final android.support.v8.renderscript.ScriptIntrinsicBlur script = android.support.v8.renderscript.ScriptIntrinsicBlur.create(rs, android.support.v8.renderscript.Element.U8_4(rs));
        script.setRadius(8f);
        script.setInput(input);
        script.forEach(output);
        output.copyTo(blurTemplate);
        return new BitmapDrawable(context.getResources(), blurTemplate);
    }

较耗时，使用异步操作

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private class setBlurredAlbumArt extends AsyncTask<Bitmap, Void, Drawable> {
        @Override
        protected Drawable doInBackground(Bitmap... loadedImage) {
            Drawable drawable = null;
            try {
                drawable = ImageUtils.createBlurredImageFromBitmap(loadedImage[0], getActivity(), 6);
            } catch (Exception e) {
                e.printStackTrace();
            }
            return drawable;
        }
        @Override
        protected void onPostExecute(Drawable result) {
            if (result != null) {
                if (mBlurredArt.getDrawable() != null) {
                    final TransitionDrawable td =
                            new TransitionDrawable(new Drawable[]{
                                    mBlurredArt.getDrawable(),
                                    result
                            });
                    mBlurredArt.setImageDrawable(td);
                    td.startTransition(200);
                } else {
                    mBlurredArt.setImageDrawable(result);
                }
            }
        }
        @Override
        protected void onPreExecute() {
        }
    }