与ViewPager滞后，以模糊和圆形图像

Question

  private class CustomPagerAdapter extends PagerAdapter {
        private Context mContext;
        private LayoutInflater mLayoutInflater;
        private ImageView displayArt;
        private ImageView songImage;
        private TextView playerName;
        private CustomPagerAdapter(Context context) {
            mContext = context;
            mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }
        @Override
        public int getCount() {
            return songList.size();
        }
        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            View itemView = mLayoutInflater.inflate(R.layout.adapter_audio_player, container, false);
            FieldIntialization(itemView);
            updatePlayerView(position);
            container.addView(itemView);
            return itemView;
        }
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((RelativeLayout) object);
        }
        private void FieldIntialization(View view) {
            displayArt = (ImageView) view.findViewById(R.id.songImage);
            songImage = (ImageView) view.findViewById(R.id.songDisplayArt);
            playerName = (TextView) view.findViewById(R.id.songName);
        }
        @Override
        public int getItemPosition(Object object) {
            return PagerAdapter.POSITION_NONE;
        }
        private void updatePlayerView(int songIndex) {
            playerName.setText(songList.get(songIndex).getPlayerTitle());
            displayArt.setScaleType(ImageView.ScaleType.FIT_XY);
            final String contentURI = "content://media/external/audio/media/" + songList.get(songIndex).getPlayerId() + "/albumart";
            Glide.with(getApplicationContext()).load(contentURI).dontAnimate().
                    error(R.drawable.music_player_background)
                    .bitmapTransform(new BlurTransformation(getApplicationContext()))
                    .into(displayArt);

            songImage.setScaleType(ImageView.ScaleType.FIT_XY);
            Bitmap originalBitmap = null;
            try {
                originalBitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), Constants.getDefaultAlbumUri(
                        String.valueOf(songList.get(songIndex).getPlayerAlbumId())
                ));
            } catch (IOException e) {
                e.printStackTrace();
            }
            if ((originalBitmap == null || originalBitmap.equals(""))) {
                Bitmap largeIcon = BitmapFactory.decodeResource(getResources(), R.drawable.no_photo);
                RoundedBitmapDrawable roundDrawable = RoundedBitmapDrawableFactory.create(getResources(), largeIcon);
                roundDrawable.setCircular(true);
                songImage.setImageDrawable(roundDrawable);
            } else {
                RoundedBitmapDrawable roundDrawable = RoundedBitmapDrawableFactory.create(getResources(), originalBitmap);
                roundDrawable.setCircular(true);
                songImage.setImageDrawable(roundDrawable);
            }

        }
    }

我必须将模糊的图像显示为背景，并用圆形图像显示。

Answer 1

模糊是CPU密集型过程。当ViewPager为相邻的视图创建视图时，它花费了太多时间来处理和创建滞后。特别是在较旧的DEIVCES和RAM较少的情况下，您将面临更多问题。

对于圆形图像，如果您需要使用圆形图像使用CircleImageView，否则仅适用于圆角，则可以使用此