android - XAPKFile 无法解析为类型

Question

当我尝试将 APK 扩展功能添加到我当前的应用程序时，我遇到了那个烦人的编译错误。“XAPKFile 无法解析为类型”。

这是我用来将 APK 扩展文件添加到我的项目中的指南。

Answer 1

我已经用了几个小时，直到我通过谷歌找到了一个地方，有人定义了这个：

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;
        }
}

所以，如果你遇到同样的错误，你唯一需要检查的是你是否定义了这个类。Android 不提供它。这可能是因为您可能不想将 FileSize 放在代码中......或者只是因为有一个错误。

Answer 2

您可以在 extras 项目的SampleDownloaderActivity中找到这个类，其中还包括一个非常有用的 APK 扩展文件实现示例。如果您下载了Google Play 扩展库（通过 SDK 管理器），您可以在以下位置找到它：

YourPathToAndroidSdk/extras/google/play_apk_expansion/downloader_library

为方便起见，我将此类与 XAPKFile 的 xAPKS 数组一起复制粘贴到此处（在扩展库的 v3 中可以找到）：

/**
 * 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
        )            
};