Question

我开发了一个Android应用程序，它有从RSS提要检索的博客文章。
这篇文章包含博客文章的标题和图像我正在使用以下代码保存图像缓存：

public class FileCache {

private File cacheDir;

public FileCache(Context context) {
    // Find the dir to save cached images
    if (android.os.Environment.getExternalStorageState().equals(
            android.os.Environment.MEDIA_MOUNTED))
        cacheDir = new File(
                android.os.Environment.getExternalStorageDirectory(),
                "LazyList");
    else
        cacheDir = context.getCacheDir();
    if (!cacheDir.exists())
        cacheDir.mkdirs();
}

public File getFile(String url) {
    // I identify images by hashcode. Not a perfect solution, good for the
    // demo.
    String filename = String.valueOf(url.hashCode());
    // Another possible solution (thanks to grantland)
    // String filename = URLEncoder.encode(url);
    File f = new File(cacheDir, filename);
    return f;

}

public void clear() {
    File[] files = cacheDir.listFiles();
    if (files == null)
        return;
    for (File f : files)
        f.delete();
}

}

但问题是它只在存储卡存在时保存缓存我想要两个选项来保存缓存，即外部存储/内部存储

Answer 1

您只是检查getExternalStorage状态是否存在并且您仅在SD卡中创建了缓存目录...尝试使用以下条件：

final String cachePath =
        Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) ||
                !isExternalStorageRemovable() ? getExternalCacheDir(context).getPath() :
                        context.getCacheDir().getPath();

return new File(cachePath + File.separator + uniqueName);

内存中的文件缓存保存

1 个答案: