com.bumptech.glide.load.DecodeFormat# PREFER_RGB_565 ( ) 源码实例Demo

@SuppressLint("CheckResult") @NonNull private RequestOptions getRequestOptions() {
  RequestOptions requestOptions = new RequestOptions();
  DecodeFormat decodeFormat;
  if (Build.VERSION.SDK_INT >= 26) {
    decodeFormat = DecodeFormat.PREFER_ARGB_8888;
    requestOptions.disallowHardwareConfig();
  } else {
    decodeFormat = DecodeFormat.PREFER_RGB_565;
  }
  return requestOptions.format(decodeFormat)
      .diskCacheStrategy(DiskCacheStrategy.RESOURCE);
}
 

@Override
public void applyOptions(final Context context, GlideBuilder builder) {
    SharedPreferencesManager manager = new SharedPreferencesManager(context);
    final String cacheSize = manager.getString(DISK_CACHE_KEY, DISK_CACHE_160MB);
    String decodeFormat = manager.getString(DECODE_FORMAT_KEY, DECODE_FORMAT_ARGB_8888);
    final String cacheName = manager.getString(DISK_CACHE_NAME_KEY, DEFAULT_CACHE_NAME);

    DecodeFormat format = null;
    switch (decodeFormat) {
        case DECODE_FORMAT_RGB_565:
            format = DecodeFormat.PREFER_RGB_565;
            break;
        default:
        case DECODE_FORMAT_ARGB_8888:
            format = DecodeFormat.PREFER_ARGB_8888;
            break;
    }
    // 高版本配置，没有禁用Hardware Bitmaps，仅Android O以上版本的新特性
    // 参阅https://muyangmin.github.io/glide-docs-cn/doc/hardwarebitmaps.html了解不能使用Hardware Bitmaps的情况
    // 不禁用可能会导致错误，但是有着节省内存和避免内存抖动的优点
    builder.setDefaultRequestOptions(new RequestOptions()
    .format(format)
    );

    builder.setDiskCache(new DiskCache.Factory() {
        @Override
        public DiskCache build() {
            int sizeInMB = 160;
            switch (cacheSize) {
                case DISK_CACHE_40MB:
                    sizeInMB = 40;
                    break;
                case DISK_CACHE_80MB:
                    sizeInMB = 80;
                    break;
                case DISK_CACHE_160MB:
                    sizeInMB = 160;
                    break;
                case DISK_CACHE_320MB:
                    sizeInMB = 320;
                    break;
                default:
                case DISK_CACHE_640MB:
                    sizeInMB = 640;
                    break;
            }

            File path = null;
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
                path = context.getExternalCacheDirs()[(context.getExternalCacheDirs().length - 1)];
            } else {
                path = context.getExternalCacheDir();
            }
            File cacheLocation = new File(path, cacheName);
            cacheLocation.mkdirs();
            return DiskLruCacheWrapper.create(cacheLocation, sizeInMB * 1024 * 1024);
        }
    });
}