Android 无法将XAPKFile解析为类型

当我试图将APK扩展功能添加到我当前的应用程序时，我遇到了那个恼人的编译错误。“XAPKFile无法解析为类型”

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是我用来将APK扩展文件添加到我的项目中的指南。

我用了几个小时，直到我通过谷歌找到一个地方，有人定义了以下内容：

private static class XAPKFile {
        public final boolean mIsMain;
        public final int mFileVersion;
        public final long mFileSize;

        XAPKFile(boolean isMain, int fileVersion, long fileSize) {
            mIsMain = isMain;
            mFileVersion = fileVersion;
            mFileSize = fileSize;
        }
}

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因此，如果您得到相同的错误，您唯一需要检查的是您是否定义了这个类。Android没有提供它。这可能是因为您不想将文件大小放在代码中……或者只是因为存在错误。

您可以在extras项目的示例下载活动中找到此类，该项目还包括一个实现APK扩展文件的非常有用的示例。如果您下载了Google Play扩展库（），您可以在以下位置找到它：

你的androidsdk/extras/google/play\u apk\u expansion/downloader\u library路径

为了方便起见，我将这个类与XAPKFile的xAPKS数组（如扩展库的v3中所示）一起复制粘贴到了这里：

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这里面有问题吗？不，这是自我回答的，以避免人们因为同样的错误而迷路。我认为它可能有用。然后请把它分成一个问题和一个单独的答案。谢谢，我不知道如何继续这个。完成！

/**
 * This is a little helper class that demonstrates simple testing of an
 * Expansion APK file delivered by Market. You may not wish to hard-code
 * things such as file lengths into your executable... and you may wish to
 * turn this code off during application development.
 */

private static class XAPKFile {
    public final boolean mIsMain;
    public final int mFileVersion;
    public final long mFileSize;

    XAPKFile(boolean isMain, int fileVersion, long fileSize) {
        mIsMain = isMain;
        mFileVersion = fileVersion;
        mFileSize = fileSize;
    }
}

/**
 * Here is where you place the data that the validator will use to determine
 * if the file was delivered correctly. This is encoded in the source code
 * so the application can easily determine whether the file has been
 * properly delivered without having to talk to the server. If the
 * application is using LVL for licensing, it may make sense to eliminate
 * these checks and to just rely on the server.
 */
private static final XAPKFile[] xAPKS = {
        new XAPKFile(
                true, // true signifies a main file
                3, // the version of the APK that the file was uploaded
                   // against
                687801613L // the length of the file in bytes
        ),
        new XAPKFile(
                false, // false signifies a patch file
                4, // the version of the APK that the patch file was uploaded
                   // against
                512860L // the length of the patch file in bytes
        )            
};