Android中如何利用Minui显示PNG格式的图片

最新推荐文章于 2025-04-14 00:30:00 发布

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本文详细介绍如何在Android系统中定制关机充电界面，包括修改Android.mk文件配置、使用C++编写自定义界面代码，以及如何调用底层库实现图片显示和文字绘制，最后展示了实际的运行效果。

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在做下面操作之前，需要先干掉SurfaceFlinger进程，参考：Android中怎么方便的调试关机充电
１.Android.mk文件如下：

# Copyright 2013 The Android Open Source Project

LOCAL_PATH := $(call my-dir)



include $(CLEAR_VARS)

LOCAL_SRC_FILES := \
    main.cpp \

LOCAL_MODULE := minui
LOCAL_MODULE_TAGS := optional
LOCAL_FORCE_STATIC_EXECUTABLE := true
LOCAL_MODULE_PATH := $(TARGET_ROOT_OUT_SBIN)
LOCAL_UNSTRIPPED_PATH := $(TARGET_ROOT_OUT_SBIN_UNSTRIPPED)

LOCAL_CFLAGS := -D__STDC_LIMIT_MACROS -Werror


LOCAL_C_INCLUDES := bootable/recovery

LOCAL_STATIC_LIBRARIES := \
    libbinder \
    libminui \
    libpng \
    libz \
    libutils \
    libbase \
    libcutils \
    liblog \
    libm \
    libc


LOCAL_HAL_STATIC_LIBRARIES := libhealthd



include $(BUILD_EXECUTABLE)

2.源码(main.cpp)如下：

#include "minui/minui.h"
#include <string>

GRSurface* surf_unknown;
static int char_width;
static int char_height;
void healthd_board_mode_charger_set_backlight(bool en);

static int draw_text(const char *str, int x, int y)
{
    int str_len_px = gr_measure(gr_sys_font(), str);

    if (x < 0)
        x = (gr_fb_width() - str_len_px) / 2;
    if (y < 0)
        y = (gr_fb_height() - char_height) / 2;
    gr_text(gr_sys_font(), x, y, str, 0);

    return y + char_height;
}

static void android_green(void)
{
    gr_color(0xa4, 0xc6, 0x39, 255);
}

static void clear_screen(void)
{
    gr_color(0, 0, 0, 255);
    gr_clear();
}

/* returns the last y-offset of where the surface ends */
static int draw_surface_centered(GRSurface* surface)
{
    int w;
    int h;
    int x;
    int y;

    w = gr_get_width(surface);
    h = gr_get_height(surface);
    x = (gr_fb_width() - w) / 2 ;
    y = (gr_fb_height() - h) / 2 ;

    printf("drawing surface %dx%d+%d+%d\n", w, h, x, y);
    gr_blit(surface, 0, 0, w, h, x, y);
    return y + h;
}

static void draw_picture(void)
{
	int ret = -1;
    std::string animation_file;

	animation_file.assign("charger/battery_fail");
	ret = res_create_display_surface(animation_file.c_str(), &surf_unknown);
	if(ret < 0)
	{
		printf("surface %s create failed\n",animation_file.c_str());
	}
	draw_surface_centered(surf_unknown);
	
}
int main(void)
{
	gr_init();
	gr_font_size(gr_sys_font(), &char_width, &char_height);
	
	clear_screen();
	healthd_board_mode_charger_set_backlight(true);

	
	android_green();
    //draw_text("Hello World!", -1, -1);
    draw_picture();
	gr_flip();
	
	printf("run anim\n");

	while(1);
	return 0;
}

这里需要指出的是res_create_display_surface寻找的资源文件的目录是/res/image,我们这儿使用的图片完整路径如下：/res/images/charger/battery_fail
3.显示效果：
在这里插入图片描述