使用 DiskLruCache 实现图片 Lru 缓存

Implementing Image Lru Caching with DiskLruCache

我正在尝试使用 jake wharton DiskLruCache 库实现基于磁盘的图像 lru 缓存。 link to library. I am using a code snippet from here.

我遇到问题的方法是这个

private boolean writeBitmapToFile(Bitmap bitmap, DiskLruCache.Editor editor)
        throws IOException, FileNotFoundException {
    OutputStream out = null;
    try {
        out = new BufferedOutputStream(editor.newOutputStream(0), Utils.IO_BUFFER_SIZE);
        return bitmap.compress(mCompressFormat, mCompressQuality, out);
    } finally {
        if (out != null) {
            out.close();
        }
    }
}

其中 editor.newOutputStream(0) 不存在,而这个

public Bitmap getBitmap(String key) {

    Bitmap bitmap = null;
    DiskLruCache.Snapshot snapshot = null;
    try {

        snapshot = mDiskCache.get(key);
        if (snapshot == null) {
            return null;
        }
        final InputStream in = snapshot.getInputStream(0);
        if (in != null) {
            final BufferedInputStream buffIn =
                    new BufferedInputStream(in, Utils.IO_BUFFER_SIZE);
            bitmap = BitmapFactory.decodeStream(buffIn);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (snapshot != null) {
            snapshot.close();
        }
    }

        Log.d("cache_test_DISK_", bitmap == null ? "" : "image read from disk " + key);

    return bitmap;

}

其中 snapshot.getInputStream(0) 也不存在。

我做错了什么?我已将 jar 与库放在一起,一切正常,这些方法是否已从 DiskLruCache 库中删除?现在还有其他方法吗?我找不到任何示例或教程。

库版本为最新的disklrucache-2.0.2

确保导入正确class:

import com.jakewharton.disklrucache.DiskLruCache