Android NDK处理用户交互事件
Android NDK处理用户交互事件
在 Android_main（struct android_app* state)函数里面设置输入事件处理函数：state->onInputEvent = &handleInput;//设置输入事件的处理函数，如触摸响应
函数介绍:
AMotionEvent_getX():以屏幕左上角为原点,是绝对坐标
AMotionEvent_getY():以屏幕左上角为原点,是绝对坐标
AMotionEvent_getPointerCount();多点触摸函数，返回触摸的点数量，跟硬件有关系
#include <jni.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <EGL/egl.h>
#include <GLES/gl.h>
#include <vector>
#include <string>
#include <map>
#include <android/sensor.h>
#include <android/log.h>
#include <android_native_app_glue.h>
#define LOGI(...) ((void)__android_log_print(ANDROID_LOG_ERROR, "native-activity", __VA_ARGS__))
#define LOGW(...) ((void)__android_log_print(ANDROID_LOG_WARN, "native-activity", __VA_ARGS__))
/**
* Our saved state data.
*/
struct saved_state {
float angle;
int32_t x;
int32_t y;
};
/**
* Shared state for our app.
*/
struct engine {
struct android_app* app;
ASensorManager* sensorManager;
const ASensor* accelerometerSensor;
ASensorEventQueue* sensorEventQueue;
int animating;
EGLDisplay display;
EGLSurface surface;
EGLContext context;
int32_t width;
int32_t height;
struct saved_state state;
};
class float3
{
public:
float x,y,z;
};
std::vector<float3> g_arVertex;
/**
* Initialize an EGL context for the current display.
*/
static int engine_init_display(struct engine* engine) {
// initialize OpenGL ES and EGL
/*
* 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_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_BLUE_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_RED_SIZE, 8,
EGL_NONE
};
EGLint w, h, dummy, format;
EGLint numConfigs;
EGLConfig config;
EGLSurface surface;
EGLContext context;
EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
eglInitialize(display, 0, 0);
/* Here, the application chooses the configuration it desires. In this
* sample, we have a very simplified selection process, where we pick
* the first EGLConfig that matches our criteria */
eglChooseConfig(display, attribs, &config, 1, &numConfigs);
/* EGL_NATIVE_VISUAL_ID is an attribute of the EGLConfig that is
* guaranteed to be accepted by ANativeWindow_setBuffersGeometry().
* As soon as we picked a EGLConfig, we can safely reconfigure the
* ANativeWindow buffers to match, using EGL_NATIVE_VISUAL_ID. */
eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format);
ANativeWindow_setBuffersGeometry(engine->app->window, 0, 0, format);
surface = eglCreateWindowSurface(display, config, engine->app->window, NULL);
context = eglCreateContext(display, config, NULL, NULL);
if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE) {
LOGW("Unable to eglMakeCurrent");
return -1;
}
eglQuerySurface(display, surface, EGL_WIDTH, &w);
eglQuerySurface(display, surface, EGL_HEIGHT, &h);
engine->display = display;
engine->context = context;
engine->surface = surface;
engine->width = w;
engine->height = h;
engine->state.angle = 0;
// Initialize GL state.
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
glEnable(GL_CULL_FACE);
glShadeModel(GL_SMOOTH);
glDisable(GL_DEPTH_TEST);
glViewport(0,0,w,h);
glOrthof(0,w,h,0,-100,100);
return 0;
}
/**
* Just the current frame in the display.
*/
static void engine_draw_frame(struct engine* engine) {
if (engine->display == NULL) {
// No display.
return;
}
// Just fill the screen with a color.
glClearColor(((float)engine->state.x)/engine->width, engine->state.angle,
((float)engine->state.y)/engine->height, 1);
glClear(GL_COLOR_BUFFER_BIT);
glEnableClientState(GL_VERTEX_ARRAY);
if(g_arVertex.size() >= 2)
{
glColor4f(1,1,1,1);
glVertexPointer(3,GL_FLOAT,0,&g_arVertex[0]);
glDrawArrays(GL_LINE_STRIP,0,g_arVertex.size());
}
eglSwapBuffers(engine->display, engine->surface);
}
/**
* Tear down the EGL context currently associated with the display.
*/
static void engine_term_display(struct engine* engine) {
if (engine->display != EGL_NO_DISPLAY) {
eglMakeCurrent(engine->display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
if (engine->context != EGL_NO_CONTEXT) {
eglDestroyContext(engine->display, engine->context);
}
if (engine->surface != EGL_NO_SURFACE) {
eglDestroySurface(engine->display, engine->surface);
}
eglTerminate(engine->display);
}
engine->animating = 0;
engine->display = EGL_NO_DISPLAY;
engine->context = EGL_NO_CONTEXT;
engine->surface = EGL_NO_SURFACE;
}
/**
* Process the next input event.
*/
static int32_t engine_handle_input(struct android_app* app, AInputEvent* event)
{
struct engine* engine = (struct engine*)app->userData;
int32_t evtType = AInputEvent_getType(event);
switch(evtType)
{
case AINPUT_EVENT_TYPE_KEY:
break;
case AINPUT_EVENT_TYPE_MOTION:
{
switch(AInputEvent_getSource(event))
{
case AINPUT_SOURCE_TOUCHSCREEN:
{
int32_t id = AMotionEvent_getAction(event);
switch(id)
{
case AMOTION_EVENT_ACTION_MOVE:
{
size_t cnt = AMotionEvent_getPointerCount(event);
for( int i = 0 ;i < cnt; ++ i )
{
float x = AMotionEvent_getX(event,i);
float y = AMotionEvent_getY(event,i);
char szBuf[64];
LOGI("x = %f y = %f",x,y);
float3 pt;
pt.x = x;
pt.y = y;
pt.z = 0;
g_arVertex.push_back(pt);
}
}
break;
case AMOTION_EVENT_ACTION_DOWN:
{
float x = AMotionEvent_getX(event,0);
float y = AMotionEvent_getY(event,0);
char szBuf[64];
LOGI("x = %f y = %f",x,y);
float3 pt;
pt.x = x;
pt.y = y;
pt.z = 0;
g_arVertex.push_back(pt);
}
break;
case AMOTION_EVENT_ACTION_UP:
break;
}
}
break;
case AINPUT_SOURCE_TRACKBALL:
break;
}
}
break;
}
if (AInputEvent_getType(event) == AINPUT_EVENT_TYPE_MOTION)
{
engine->animating = 1;
engine->state.x = AMotionEvent_getX(event, 0);
engine->state.y = AMotionEvent_getY(event, 0);
return 1;
}
return 0;
}
/**
* Process the next main command.
*/
static void engine_handle_cmd(struct android_app* app, int32_t cmd) {
struct engine* engine = (struct engine*)app->userData;
switch (cmd) {
case APP_CMD_SAVE_STATE:
break;
case APP_CMD_INIT_WINDOW:
// The window is being shown, get it ready.
if (engine->app->window != NULL) {
engine_init_display(engine);
}
break;
case APP_CMD_TERM_WINDOW:
// The window is being hidden or closed, clean it up.
engine_term_display(engine);
break;
case APP_CMD_GAINED_FOCUS:
break;
case APP_CMD_LOST_FOCUS:
break;
}
}
/**
* This is the main entry point of a native application that is using
* android_native_app_glue. It runs in its own thread, with its own
* event loop for receiving input events and doing other things.
*/
void android_main(struct android_app* state) {
struct engine engine;
// Make sure glue isn't stripped.
app_dummy();
memset(&engine, 0, sizeof(engine));
state->userData = &engine;
state->onAppCmd = engine_handle_cmd;
state->onInputEvent = engine_handle_input;
engine.app = state;
// Prepare to monitor accelerometer
engine.sensorManager = ASensorManager_getInstance();
engine.accelerometerSensor = ASensorManager_getDefaultSensor(engine.sensorManager,
ASENSOR_TYPE_ACCELEROMETER);
if (state->savedState != NULL) {
// We are starting with a previous saved state; restore from it.
engine.state = *(struct saved_state*)state->savedState;
}
int ident, events;
struct android_poll_source* source;
while (true)
{
while ((ident = ALooper_pollAll(0, NULL, &events, (void**)&source)) >= 0)
{
if (source != NULL)
source->process(state, source);
if (state->destroyRequested != 0)
return;
}
engine_draw_frame(&engine);
}
}
效果如图所示。
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