Android 8.1 关机充电动画（三）Android模式

system：Android 8.1

platform：RK3326/PX30

uboot

kernel

system/core/healthd

Android 8.1 关机充电动画（一）模式选择

 Android 8.1 关机充电动画（二）Uboot模式

 Android 8.1 关机充电动画（三）Android模式

文章目录

前言
文件列表
修改 healthd_mode_charger.cpp

init_animation
healthd_mode_charger_init
替换图片

总结

前言

Android模式下的关机充电动画修改相对来说需要修改Linux应用层的东西了，可以定位到源码路径/system/core/healthd下，和uboot模式类似，这里只需要修改轮播的充电图片，然后将每张图片和电量百分比对应到代码中即可，思路还是比较简单的，下面我会慢慢分析具体实现的细节。

文件列表

在system/core/healthd下可以看到以下文件，只有一部分文件需要修改，我们需要重点关注一下healthd_mode_charger.cpp，因为基本上修改这个文件就够了。

Android.mk						11-Jun-2018	5.2 KiB

animation.h						11-Jun-2018	1.7 KiB

AnimationParser.cpp				11-Jun-2018	4.8 KiB

AnimationParser.h				11-Jun-2018	1 KiB

BatteryMonitor.cpp				11-Jun-2018	24 KiB

BatteryPropertiesRegistrar.cpp	11-Jun-2018	4 KiB

BatteryPropertiesRegistrar.h	11-Jun-2018	1.8 KiB

charger.cpp						11-Jun-2018	2.8 KiB

healthd.cpp						11-Jun-2018	3.8 KiB

healthd_common.cpp				11-Jun-2018	8.6 KiB

healthd_draw.cpp				11-Jun-2018	5.7 KiB

healthd_draw.h					11-Jun-2018	2.3 KiB

healthd_mode_android.cpp		11-Jun-2018	2 KiB

healthd_mode_charger.cpp		11-Jun-2018	20.6 KiB

images/							11-Jun-2018	4 KiB

include/						11-Jun-2018	4 KiB

tests/							11-Jun-2018	4 KiB

修改 healthd_mode_charger.cpp

在头文件animation.h的结构体animation添加成员变量user_animation_file，如下所示；

struct animation {

...

	#define USER_IMAGE_NUM 5

	std::string user_animation_file[USER_IMAGE_NUM];

...

}

在healthd_mode_charger.cpp添加frame数组user_animation_frames，目前添加了5帧画面，而且代码里直接固定为5帧的画面为一个充电循环来做，这里后面可能需要改动一下；

static animation::frame user_animation_frames[] = {

    {

        .disp_time = 750,

        .min_level = 0,

        .max_level = 19,

        .surface = NULL,

    },

    {

        .disp_time = 750,

        .min_level = 0,

        .max_level = 39,

        .surface = NULL,

    },

    {

        .disp_time = 750,

        .min_level = 0,

        .max_level = 59,

        .surface = NULL,

    },

    {

        .disp_time = 750,

        .min_level = 0,

        .max_level = 79,

        .surface = NULL,

    },

    {

        .disp_time = 750,

        .min_level = 0,

        .max_level = 100,

        .surface = NULL,

    },

};

init_animation

需要对init_animation函数进行部分的修改，这里简单说明一下；

animation_desc_path = "/res/values/charger/animation.txt" ，这里程序中路径具体我也没有找到源码中对应的路径，最终debug的结果是parse_success = false 是一直成立的；所以程序中会直接制定路径下的图片，源码路径system/core/healthd/images/下的图片会在编译的过程中被拷贝到制定的路径下；
原程序的做法只去解析一张png图片，而且这张图片中包含了所有电池电量百分比的对应信息。
修改部分加入到条件编译的宏定义CHARGER_USER_ANIMATION中；

animation* init_animation() {

    bool parse_success;

    std::string content;

    if (base::ReadFileToString(animation_desc_path, &content)) {

        parse_success = parse_animation_desc(content, &battery_animation);

    } else {

        LOGW("Could not open animation description at %s\n", animation_desc_path);

        parse_success = false;

    }

    if (!parse_success) {

        LOGW("Could not parse animation description. Using default animation.\n");

        battery_animation = BASE_ANIMATION;

#ifdef CHARGER_USER_ANIMATION

		battery_animation.user_animation_file[0].assign("charger/battery_user_0");

		battery_animation.user_animation_file[1].assign("charger/battery_user_1");

		battery_animation.user_animation_file[2].assign("charger/battery_user_2");

		battery_animation.user_animation_file[3].assign("charger/battery_user_3");

		battery_animation.user_animation_file[4].assign("charger/battery_user_4");

		battery_animation.frames = user_animation_frames;

        battery_animation.num_frames = ARRAY_SIZE(user_animation_frames);

#else

        battery_animation.animation_file.assign("charger/battery_scale");

        battery_animation.frames = default_animation_frames;

		battery_animation.num_frames = ARRAY_SIZE(default_animation_frames);

#endif

    }

    if (battery_animation.fail_file.empty()) {

#ifdef CHARGER_USER_ANIMATION

		battery_animation.fail_file.assign("charger/battery_user_fail");

#else

        battery_animation.fail_file.assign("charger/battery_fail");

#endif

    }

	if(battery_animation.text_percent.font_file.empty())

	battery_animation.text_percent.font_file.assign("charger/font");

	//battery_animation.text_clock.font_file.assign("charger/font");

    LOGW("Animation Description:\n");

    LOGW("  animation: %d %d '%s' (%d)\n", battery_animation.num_cycles,

         battery_animation.first_frame_repeats, battery_animation.animation_file.c_str(),

         battery_animation.num_frames);

    LOGW("  fail_file: '%s'\n", battery_animation.fail_file.c_str());

    LOGW("  clock: %d %d %d %d %d %d '%s'\n", battery_animation.text_clock.pos_x,

         battery_animation.text_clock.pos_y, battery_animation.text_clock.color_r,

         battery_animation.text_clock.color_g, battery_animation.text_clock.color_b,

         battery_animation.text_clock.color_a, battery_animation.text_clock.font_file.c_str());

    LOGW("  percent: %d %d %d %d %d %d '%s'\n", battery_animation.text_percent.pos_x,

         battery_animation.text_percent.pos_y, battery_animation.text_percent.color_r,

         battery_animation.text_percent.color_g, battery_animation.text_percent.color_b,

         battery_animation.text_percent.color_a, battery_animation.text_percent.font_file.c_str());

    for (int i = 0; i < battery_animation.num_frames; i++) {

        LOGW("  frame %.2d: %d %d %d\n", i, battery_animation.frames[i].disp_time,

             battery_animation.frames[i].min_level, battery_animation.frames[i].max_level);

    }

    return &battery_animation;

}

healthd_mode_charger_init

Android底层的2D引擎库使用了skia，对应的每一帧需要分配GRSurface，通过函数res_create_display_surface分配内存，所以，对于需要定制加入的图片，都需要重新分配内存，然后保存到anim->frames[i].surface中，具体的修改如下所示；

void healthd_mode_charger_init(struct healthd_config* config) {

    int ret;

    charger* charger = &charger_state;

    int i;

    int epollfd;

    dump_last_kmsg();

    LOGW("--------------- STARTING CHARGER MODE ---------------\n");

    ret = ev_init(std::bind(&input_callback, charger, std::placeholders::_1, std::placeholders::_2));

    if (!ret) {

        epollfd = ev_get_epollfd();

        healthd_register_event(epollfd, charger_event_handler, EVENT_WAKEUP_FD);

    }

    animation* anim = init_animation();

    charger->batt_anim = anim;

    ret = res_create_display_surface(anim->fail_file.c_str(), &charger->surf_unknown);

    if (ret < 0) {

        LOGE("Cannot load custom battery_fail image. Reverting to built in.\n");

        ret = res_create_display_surface("charger/battery_fail", &charger->surf_unknown);

        if (ret < 0) {

            LOGE("Cannot load built in battery_fail image\n");

            charger->surf_unknown = NULL;

        }

    }

#ifdef CHARGER_USER_ANIMATION

    GRSurface* scale_frames[USER_IMAGE_NUM];

	for(int i = 0; i<USER_IMAGE_NUM; i++){

		ret = res_create_display_surface(anim->user_animation_file[i].c_str(), &scale_frames[i]);

			if (ret < 0) {

				LOGE("Cannot load custom %s image. Reverting to built in.\n",anim->user_animation_file[i].c_str());

			}else{

				anim->frames[i].surface = scale_frames[i];

				LOGW("file is:[%s],anim->frames[%d].surface = charger->surf_unknown;\n",

					anim->user_animation_file[i].c_str(),i);

			}

	}

#else

	GRSurface** scale_frames

    int scale_count;

    int scale_fps;  // Not in use (charger/battery_scale doesn't have FPS text

                    // chunk). We are using hard-coded frame.disp_time instead.

	ret = res_create_multi_display_surface(anim->animation_file.c_str(), &scale_count, &scale_fps,

											   &scale_frames);

		if (ret < 0) {

			LOGE("Cannot load battery_scale image\n");

			anim->num_frames = 0;

			anim->num_cycles = 1;

		} else if (scale_count != anim->num_frames) {

			LOGE("battery_scale image has unexpected frame count (%d, expected %d)\n", scale_count,

				 anim->num_frames);

			anim->num_frames = 0;

			anim->num_cycles = 1;

		} else {

			for (i = 0; i < anim->num_frames; i++) {

				anim->frames[i].surface = scale_frames[i];

			}

		}

#endif

    ev_sync_key_state(

        std::bind(&set_key_callback, charger, std::placeholders::_1, std::placeholders::_2));

    charger->next_screen_transition = -1;

    charger->next_key_check = -1;

    charger->next_pwr_check = -1;

    healthd_config = config;

    charger->boot_min_cap = config->boot_min_cap;

}

替换图片

把图片复制到/system/core/healthd/images/路径下，注意图片格式需要是png，而且图片保存的位深度为8位，文件名需要和程序中定义的路径变量保持一致即可；如下所示；我简单地切了五张图片，感觉切图的时间比debug的时间还要久。苦。

Android 8.1 关机充电动画（三）Android模式

然后，在Android.mk中可找到，在编译的时候对图片进行了打包，相应的命令如下所示；

...

 _img_modules :=

 _images :=

 $(foreach _img, $(call find-subdir-subdir-files, "images", "*.png"), \

   $(eval $(call _add-charger-image,$(_img))))

...

完成以上这些步骤之后，重新编译Android系统，当然还需要进入关机充电的Android模式，可以发现充电动画已经修改完了。

总结

这里介绍的是比较简单对充电动画的单帧图片进行替换，如果有更加复杂的需求，还需要在healthd_draw.cpp进行修改，或者更高级可以自己画充电动画出来也未尝不可。

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