Android 如何使用本机活动？它能与传统活动结合起来吗？

我有两个库（.so），我用java代码加载它们

但是，有一些特定的操作需要Java（活动）C++（.so文件）调用

我可以使用本机活动来实现这些功能的一部分吗？本土活动是传统活动之外的活动吗？还是我必须选择，我将使用哪种类型的活动

[编辑]

有一组事件可以由

android ndk/sources/android/native_app_glue/android_native_app_glue.h

enum {
    /**
     * Command from main thread: the AInputQueue has changed.  Upon processing
     * this command, android_app->inputQueue will be updated to the new queue
     * (or NULL).
     */
    APP_CMD_INPUT_CHANGED,

    /**
     * Command from main thread: a new ANativeWindow is ready for use.  Upon
     * receiving this command, android_app->window will contain the new window
     * surface.
     */
    APP_CMD_INIT_WINDOW,

    /**
     * Command from main thread: the existing ANativeWindow needs to be
     * terminated.  Upon receiving this command, android_app->window still
     * contains the existing window; after calling android_app_exec_cmd
     * it will be set to NULL.
     */
    APP_CMD_TERM_WINDOW,

    /**
     * Command from main thread: the current ANativeWindow has been resized.
     * Please redraw with its new size.
     */
    APP_CMD_WINDOW_RESIZED,

    /**
     * Command from main thread: the system needs that the current ANativeWindow
     * be redrawn.  You should redraw the window before handing this to
     * android_app_exec_cmd() in order to avoid transient drawing glitches.
     */
    APP_CMD_WINDOW_REDRAW_NEEDED,

    /**
     * Command from main thread: the content area of the window has changed,
     * such as from the soft input window being shown or hidden.  You can
     * find the new content rect in android_app::contentRect.
     */
    APP_CMD_CONTENT_RECT_CHANGED,

    /**
     * Command from main thread: the app's activity window has gained
     * input focus.
     */
    APP_CMD_GAINED_FOCUS,

    /**
     * Command from main thread: the app's activity window has lost
     * input focus.
     */
    APP_CMD_LOST_FOCUS,

    /**
     * Command from main thread: the current device configuration has changed.
     */
    APP_CMD_CONFIG_CHANGED,

    /**
     * Command from main thread: the system is running low on memory.
     * Try to reduce your memory use.
     */
    APP_CMD_LOW_MEMORY,

    /**
     * Command from main thread: the app's activity has been started.
     */
    APP_CMD_START,

    /**
     * Command from main thread: the app's activity has been resumed.
     */
    APP_CMD_RESUME,

    /**
     * Command from main thread: the app should generate a new saved state
     * for itself, to restore from later if needed.  If you have saved state,
     * allocate it with malloc and place it in android_app.savedState with
     * the size in android_app.savedStateSize.  The will be freed for you
     * later.
     */
    APP_CMD_SAVE_STATE,

    /**
     * Command from main thread: the app's activity has been paused.
     */
    APP_CMD_PAUSE,

    /**
     * Command from main thread: the app's activity has been stopped.
     */
    APP_CMD_STOP,

    /**
     * Command from main thread: the app's activity is being destroyed,
     * and waiting for the app thread to clean up and exit before proceeding.
     */
    APP_CMD_DESTROY,
};

<>因为我知道我的代码的一部分（应该在特定事件之后调用）是用C++编写的，我认为最好是通过本地活动在C++中处理这个问题。然而，我也有一些代码，它们必须在Java中处理事件之后调用

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问题是。。。我可以拥有我的活动的本机版本（本机接口）吗？它可以帮助我处理一些事件，同时我可以拥有同一活动的传统java接口吗？

我会回答，一个活动不能有两个版本的代码

• 您将如何在您的清单中指定

• 在谷歌提供的示例中，main的评论非常明确：

它在自己的线程中运行，具有自己的事件循环，用于接收输入事件和执行其他操作

本机活动将处理循环

中的所有事件，而（1）{…}

。混合使用Java和本机事件是不可能的

依我看，使用本机活动的主要原因是UI。如果您已经在C++中拥有了完全功能的UI，那么对于您来说，使用本地活动更容易和更便携。您仍然可以为android自定义应用程序并添加其他java活动（不要忘记将

android:hasCode=“TRUE”

放在清单中！）。在另一种情况下，使用java活动可以让您充分使用GoogleUI，并在需要时调用本机库

关于你的绩效问题，当你说：

<>我想最好是通过本地活动

在C++中处理这个问题。 看看这个：

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希望这有帮助

据我所知，您的问题是“无法加载两个本机库”，对吗？