如何使用 NDK 在 Pixel 6a 模拟器上注册屏幕旋转事件？

Question

我正在尝试检测我的设备上的屏幕旋转。我有以下...

void handle_cmd(android_app *pApp, int32_t cmd) {
    aout << "Got Command " << cmd << std::endl;
    switch (cmd) {
        case APP_CMD_INIT_WINDOW:
            // A new window is created, associate a renderer with it. You may replace this with a
            // "game" class if that suits your needs. Remember to change all instances of userData
            // if you change the class here as a reinterpret_cast is dangerous this in the
            // android_main function and the APP_CMD_TERM_WINDOW handler case.
            pApp->userData = new Renderer(pApp);
            break;
        case APP_CMD_TERM_WINDOW:
            // The window is being destroyed. Use this to clean up your userData to avoid leaking
            // resources.
            //
            // We have to check if userData is assigned just in case this comes in really quickly
            if (pApp->userData) {
                //
                auto *pRenderer = reinterpret_cast<Renderer *>(pApp->userData);
                pApp->userData = nullptr;
                delete pRenderer;
            }
            break;
        case APP_CMD_CONFIG_CHANGED:
            // The current device configuration has changed.
            aout << "Device configuration has changed (e.g., orientation)" << std::endl;
            break;
        default:
            break;
    }
}

当我在模拟器中运行并旋转屏幕（然后单击图标;-)）时，我在 logcat 中看不到

Device configuration has changed

。如果我检查触发的事件，我会发现......

...  AO                      com.example.testapp                  D  Got Command 13
...  AO                      com.example.testapp                  D  Got Command 2
...  AO                      com.example.testapp                  D  Got Command 14
...  AO                      com.example.testapp                  D  Got Command 12
...  AO                      com.example.testapp                  D  Got Command 15
...  AO                      com.example.testapp                  D  Got Command 10
...  AO                      com.example.testapp                  D  Got Command 11
...  AO                      com.example.testapp                  D  Got Command 16
...  AO                      com.example.testapp                  D  Got Command 16
...  AO                      com.example.testapp                  D  Got Command 1
...  AO                      com.example.testapp                  D  Got Command 3
...  AO                      com.example.testapp                  D  Got Command 4
...  AO                      com.example.testapp                  D  Got Command 6
...  AO                      com.example.testapp                  D  Got Command 16

这也没有显示

APP_CMD_CONFIG_CHANGED

应该是 8。那么我应该使用这些事件中的哪一个来注册状态更改？还有一个页面显示每个枚举的数值吗？

Answer 1

这仅适用于 Android Oreo 之前的版本，并且在问题跟踪器上它也被标记为“无法修复”。
建议的解决方法是在 Java 中覆盖

onConfigurationChanged()

，然后调用 JNI。