尝试使用android-ndk-r8e构建本地Android应用程序。
如果将其作为Java + NDK应用程序构建（即使用加载.so文件的Java接口、初始化OpenGL并调用.so中方法），则代码可以编译成功并且运行没有问题。
但是，当编译为"native-activity"后，在setup()函数之后，LogCat输出"A//system/bin/app_process(27426): stack corruption detected: aborted"。
以下是android_main函数。
如果将其作为Java + NDK应用程序构建（即使用加载.so文件的Java接口、初始化OpenGL并调用.so中方法），则代码可以编译成功并且运行没有问题。
但是，当编译为"native-activity"后，在setup()函数之后，LogCat输出"A//system/bin/app_process(27426): stack corruption detected: aborted"。
void Canvas::Setup ( void )
{
// initialize OpenGL ES 2
// Here specify the attributes of the desired configuration.
// Below, we select an EGLConfig with at least 8 bits per color
// component compatible with on-screen windows
const EGLint attribs[] =
{
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_NONE
};
// ..
// surface, window and context related data
EGLint w,
h,
dummy,
format;
EGLConfig config;
EGLSurface surface;
EGLContext context;
EGLDisplay display = eglGetDisplay( EGL_DEFAULT_DISPLAY );
// ..
eglInitialize(display, 0, 0);
// get the number of matching EGL configurations
int num_config[1];
eglChooseConfig(display, attribs, NULL, 1, num_config);
const int numConfigs = num_config[0];
if (numConfigs <= 0)
{
//throw new IllegalArgumentException("No configs match configSpec");
}
// allocate then read the array of minimally matching EGL configs
EGLConfig configs[numConfigs];
EGLConfig current;
eglChooseConfig(display, attribs, configs, numConfigs, num_config);
int i = 0;
for(; i < numConfigs; ++i)
{
int d = 2, s = 2, r, g, b, a;
eglGetConfigAttrib(display, configs[i], EGL_DEPTH_SIZE, &d);
eglGetConfigAttrib(display, configs[i], EGL_STENCIL_SIZE, &s);
// we need at least mDepthSize and mStencilSize bits
if (d < 1 || s < 0)
{
continue;
}
// we want an *exact* match for red/green/blue/alpha
eglGetConfigAttrib(display, configs[i], EGL_RED_SIZE, &r);
eglGetConfigAttrib(display, configs[i], EGL_GREEN_SIZE, &g);
eglGetConfigAttrib(display, configs[i], EGL_BLUE_SIZE, &b);
eglGetConfigAttrib(display, configs[i], EGL_ALPHA_SIZE, &a);
if (r == 8 && g == 8 && b == 8 && a == 8)
{
// found it, store in i
break;
}
}
surface = eglCreateWindowSurface(display, configs[i], Canvas::Engine.app->window, NULL);
int attrib_list[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
context = eglCreateContext(display, configs[i], EGL_NO_CONTEXT, attrib_list);
if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE)
{
LOG_PRINT_ERROR("Unable to eglMakeCurrent");
}
Canvas::Engine.display = display;
Canvas::Engine.context = context;
Canvas::Engine.surface = surface;
Canvas::Engine.animating = true;
eglQuerySurface(display, surface, EGL_WIDTH, &w);
eglQuerySurface(display, surface, EGL_HEIGHT, &h);
Canvas::Width = w;
Canvas::Width = h;
}
以下是android_main函数。
void android_main(struct android_app* state)
{
// make sure glue isn't stripped.
app_dummy();
// ..
// hook to events
memset(&Canvas::Engine, 0, sizeof(Canvas::Engine));
state->userData = &Canvas::Engine;
state->onAppCmd = Canvas::HandleCommand;
state->onInputEvent = Canvas::HandleInput;
Canvas::Engine.app = state;
// ..
// loop waiting for stuff to do
while (1)
{
// read all pending events.
int ident;
int events;
struct android_poll_source* source;
// If not animating, we will block forever waiting for events.
// If animating, we loop until all events are read, then continue
// to draw the next frame of animation.
while ((ident=ALooper_pollAll(Canvas::Engine.animating ? 0 : -1, NULL, &events, (void**)&source)) >= 0)
{
// process this event.
if (source != NULL)
{
source->process(state, source);
}
// check if we are exiting.
if (state->destroyRequested != 0)
{
Canvas::Cleanup();
return;
}
}
Canvas::Render();
}
// ..
}
这里是我处理Android窗口命令的地方。
void Canvas::HandleCommand(struct android_app* app, int32_t cmd)
{
switch (cmd)
{
case APP_CMD_INIT_WINDOW:
// window is being shown, get it ready
LOG_PRINT_INFO("before setup");
Canvas::Setup();
LOG_PRINT_INFO("after setup");
LOG_PRINT_INFO("before resize);
Canvas::Resize(Canvas::Engine.width, Canvas::Engine.height);
LOG_PRINT_INFO("after resize);
break;
case APP_CMD_TERM_WINDOW:
// window is being hidden or closed, clean it up
Canvas::Cleanup();
break;
}
}
LogCat正确打印了“setup之前”的消息。如果你看代码，它应该打印“setup之后”。但有时它会打印“检测到堆栈损坏：已中止”，而其他时候它只是简单地退出循环，尽管没有代码（我写的）使其返回。
需要提到的是，NDK代码基于此示例。Java版本看起来几乎一样，并且运行良好。