GalleryCache.java 文件源码

@Override
protected Bitmap doInBackground(Void... params) {
    Bitmap bitmap = null;
    try {
        bitmap = ThumbnailUtils.createVideoThumbnail(mImageKey, Thumbnails.FULL_SCREEN_KIND);

        if (bitmap != null) {
            bitmap = Bitmap.createScaledBitmap(bitmap, mMaxWidth, mMaxWidth, false);
            addBitmapToCache(mImageKey, bitmap);
            return bitmap;
        }
        return null;
    } catch (Exception e) {
        if (e != null) {
            e.printStackTrace();
        }
        return null;
    }
}