替换android_native_app_glue实现, 直接使用ANativeActivity回调

最新推荐文章于 2024-05-20 23:28:07 发布

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最新推荐文章于 2024-05-20 23:28:07 发布

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分类专栏： Android 文章标签： NDK android_native_app_g ANativeActivity c

本文链接：https://blog.youkuaiyun.com/tom_221x/article/details/50643228

本文介绍了如何直接使用ANativeActivity事件回调替代NDK的android_native_app_glue，通过自定义线程并控制Looper处理输入事件和传感器事件。在游戏切回前台时，线程会恢复执行，避免了重复初始化EGL的问题。同时，文章指出在某些场景下可能出现的消息丢失问题及其解决方案。

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NDK为我们提供了胶水层android_native_app_glue，但我们现在要抛弃它，我们能够有一个更简单更有效率的玩法。替换思路如下：

直接使用ANativeActivity事件回调，放弃使用Looper的方案
input.h和senor.h提供的接口中，必须使用Looper，所以还是会初始化一个Looper
Looper使用回调函数模式

首先，ANativeActivity提供的回调函数，我们全部挂载上，这里的事件属于主线程事件，来自于java代码回调。我们还是会自己启动一个线程，完全控制执行逻辑。

void ANativeActivity_OnCreate(ANativeActivity* activity, void* savedState, size_t savedStateSize)
{
	ALog_D("ANativeActivity_onCreate OnCreate");

    activity->callbacks->onStart                    = OnStart;
    activity->callbacks->onResume                   = OnResume;
//  activity->callbacks->onSaveInstanceState        = OnSaveInstanceState;
    activity->callbacks->onPause                    = OnPause;
    activity->callbacks->onStop                     = OnStop;
    activity->callbacks->onDestroy                  = OnDestroy;
    activity->callbacks->onWindowFocusChanged       = OnWindowFocusChanged;
    activity->callbacks->onNativeWindowCreated      = OnNativeWindowCreated;
    activity->callbacks->onNativeWindowResized      = OnNativeWindowResized;
    activity->callbacks->onNativeWindowRedrawNeeded = OnNativeWindowRedrawNeeded;
    activity->callbacks->onNativeWindowDestroyed    = OnNativeWindowDestroyed;
    activity->callbacks->onInputQueueCreated        = OnInputQueueCreated;
    activity->callbacks->onInputQueueDestroyed      = OnInputQueueDestroyed;
    activity->callbacks->onContentRectChanged       = OnContentRectChanged;
    activity->callbacks->onConfigurationChanged     = OnConfigurationChanged;
    activity->callbacks->onLowMemory                = OnLowMemory;


/*
    if (savedState)
    {
        AData->savedState     = malloc(savedStateSize);
        AData->savedStateSize = savedStateSize;
        memcpy(AData->savedState, savedState, savedStateSize