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#include <lvgl/lvgl.h>
#include <android/native_window.h>
#include <android/log.h>
#include <android_native_app_glue.h>
#include <time.h>
#include <stdlib.h>
#include <unistd.h>
#define LOG_TAG "lvgl_basic"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
static lv_display_t * display = NULL;
static lv_indev_t * indev = NULL;
static void * disp_buf = NULL;
static ANativeWindow * native_window = NULL;
static int32_t window_width = 0;
static int32_t window_height = 0;
static lv_obj_t * label_fps = NULL;
static bool touch_down = false;
static int32_t touch_x = 0;
static int32_t touch_y = 0;
static void my_flush_cb(lv_display_t * disp, const lv_area_t * area, uint8_t * px_map) {
if (!native_window) {
lv_display_flush_ready(disp);
return;
}
ANativeWindow_Buffer buffer;
if (ANativeWindow_lock(native_window, &buffer, NULL) < 0) {
lv_display_flush_ready(disp);
return;
}
int32_t width = lv_area_get_width(area);
int32_t height = lv_area_get_height(area);
// Assume 32-bit RGBA
uint32_t * dst_base = (uint32_t *)buffer.bits;
uint32_t * src = (uint32_t *)px_map;
int stride = buffer.stride;
for (int y = 0; y < height; y++) {
uint32_t * dst_line = dst_base + (area->y1 + y) * stride + area->x1;
memcpy(dst_line, src + y * width, width * sizeof(uint32_t));
}
ANativeWindow_unlockAndPost(native_window);
lv_display_flush_ready(disp);
}
static void my_input_read(lv_indev_t * indev, lv_indev_data_t * data) {
data->point.x = touch_x;
data->point.y = touch_y;
data->state = touch_down ? LV_INDEV_STATE_PRESSED : LV_INDEV_STATE_RELEASED;
}
static void create_ui(void) {
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "Hello Xmake + LVGL!");
lv_obj_set_style_text_font(label, &lv_font_montserrat_14, 0);
lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 50);
// FPS label
label_fps = lv_label_create(lv_screen_active());
lv_label_set_text(label_fps, "FPS: 0");
lv_obj_set_style_text_font(label_fps, &lv_font_montserrat_14, 0);
lv_obj_align(label_fps, LV_ALIGN_TOP_MID, 0, 100);
}
static void handle_cmd(struct android_app* app, int32_t cmd) {
switch (cmd) {
case APP_CMD_INIT_WINDOW:
LOGI("Init Window");
native_window = app->window;
window_width = ANativeWindow_getWidth(native_window);
window_height = ANativeWindow_getHeight(native_window);
ANativeWindow_setBuffersGeometry(native_window, window_width, window_height, WINDOW_FORMAT_RGBA_8888);
if (!display) {
display = lv_display_create(window_width, window_height);
lv_display_set_color_format(display, LV_COLOR_FORMAT_ARGB8888);
lv_display_set_flush_cb(display, my_flush_cb);
size_t buf_size = window_width * window_height * 4;
disp_buf = malloc(buf_size);
lv_display_set_buffers(display, disp_buf, NULL, buf_size, LV_DISPLAY_RENDER_MODE_FULL);
indev = lv_indev_create();
lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
lv_indev_set_read_cb(indev, my_input_read);
create_ui();
} else {
lv_display_set_resolution(display, window_width, window_height);
lv_obj_invalidate(lv_scr_act());
}
break;
case APP_CMD_TERM_WINDOW:
native_window = NULL;
break;
case APP_CMD_DESTROY:
if (display) {
lv_display_delete(display);
display = NULL;
}
if (indev) {
lv_indev_delete(indev);
indev = NULL;
}
if (disp_buf) {
free(disp_buf);
disp_buf = NULL;
}
break;
}
}
static int32_t handle_input(struct android_app* app, AInputEvent* event) {
if (AInputEvent_getType(event) == AINPUT_EVENT_TYPE_MOTION) {
int action = AMotionEvent_getAction(event) & AMOTION_EVENT_ACTION_MASK;
touch_x = AMotionEvent_getX(event, 0);
touch_y = AMotionEvent_getY(event, 0);
if (action == AMOTION_EVENT_ACTION_DOWN || action == AMOTION_EVENT_ACTION_MOVE) {
touch_down = true;
} else {
touch_down = false;
}
return 1;
}
return 0;
}
void android_main(struct android_app* app) {
lv_init();
app->onAppCmd = handle_cmd;
app->onInputEvent = handle_input;
int frame_count = 0;
time_t last_time = time(NULL);
while (1) {
int ident;
int events;
struct android_poll_source* source;
uint32_t timeout = lv_timer_handler();
if (timeout > 50) timeout = 50;
while ((ident = ALooper_pollAll(timeout, NULL, &events, (void**)&source)) >= 0) {
if (source != NULL) source->process(app, source);
if (app->destroyRequested != 0) return;
}
lv_tick_inc(timeout);
frame_count++;
time_t current_time = time(NULL);
if (current_time - last_time >= 1) {
if (label_fps) {
lv_label_set_text_fmt(label_fps, "FPS: %d", frame_count);
}
frame_count = 0;
last_time = current_time;
}
}
}
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