android 9.0關機充電流程，充電圖標和電量顯示百分比修改
版權聲明：本文爲博主原創文章，遵循 CC 4.0 BY-SA 版權協議，轉載請附上原文出處鏈接和本聲明
原文鏈接：https://blog.csdn.net/yy782101688/article/details/102852180
相關源文件
system/core/healthd/healthd_draw.cpp
system/core/healthd/images/battery_fail.png
system/core/healthd/images/battery_scale.png
/system/core/healthd/ charger.cpp
hardware/interfaces/health/2.0/default/healthd_common.cpp
system/core/healthd/healthd_mode_charger.cpp
bootable/recovery/minui/graphics.cpp
bootable/recovery/minui/font_10x18.h
電量顯示百分比字體替換
android默認文字和充電圖標分開。
android 9.0的充電圖標和電量百分比顯示主要在函數 healthd_mode_charger_heartbeat中實現。
void healthd_mode_charger_heartbeat() {
charger* charger = &charger_state;
int64_t now = curr_time_ms();
handle_input_state(charger, now);
handle_power_supply_state(charger, now);
/* do screen update last in case any of the above want to start
* screen transitions (animations, etc)
*/
update_screen_state(charger, now);
}
static void update_screen_state(charger* charger, int64_t now) {
animation* batt_anim = charger->batt_anim;
int disp_time;
if (!batt_anim->run || now < charger->next_screen_transition) return;
if (healthd_draw == nullptr) {
if (healthd_config && healthd_config->screen_on) {
if (!healthd_config->screen_on(batt_prop)) {
LOGV("[%" PRId64 "] leave screen off\n", now);
batt_anim->run = false;
charger->next_screen_transition = -1;
if (charger->charger_connected) request_suspend(true);
return;
}
}
healthd_draw.reset(new HealthdDraw(batt_anim));
#ifndef CHARGER_DISABLE_INIT_BLANK
set_backlight(false);
healthd_draw->blank_screen(true);
#endif
}
/*如果當前顯示的循環次數已經爲設置的最大cycle，就做滅屏處理，等待下次按下*/
/*power鍵或者拔掉usb*/
/* animation is over, blank screen and leave */
if (batt_anim->num_cycles > 0 && batt_anim->cur_cycle == batt_anim->num_cycles) {
reset_animation(batt_anim);
charger->next_screen_transition = -1;
set_backlight(false);
healthd_draw->blank_screen(true);
LOGV("[%" PRId64 "] animation done\n", now);
if (charger->charger_connected) request_suspend(true);
return;
}
/*設置一幀，即一個png圖片的顯示時間*/
disp_time = batt_anim->frames[batt_anim->cur_frame].disp_time;
/*充電休眠過程中按power鍵或者插第一次剛開始充電時候亮屏*/
/* unblank the screen on first cycle and first frame */
if (batt_anim->cur_cycle == 0 && batt_anim->cur_frame == 0) {
healthd_draw->blank_screen(false);
set_backlight(true);
}
/*當前幀如果是第一幀（按下power鍵喚醒或者第一次剛開始充電）*/
/*根據實際電量，確認起始幀(即從第幾張png圖片開始顯示)，起始*/
/*幀顯示時間加first_frame_repeats*/
/* animation starting, set up the animation */
if (batt_anim->cur_frame == 0) {
LOGV("[%" PRId64 "] animation starting\n", now);
if (batt_prop) {
batt_anim->cur_level = batt_prop->batteryLevel;
batt_anim->cur_status = batt_prop->batteryStatus;
if (batt_prop->batteryLevel >= 0 && batt_anim->num_frames != 0) {
/* find first frame given current battery level */
for (int i = 0; i < batt_anim->num_frames; i++) {
if (batt_anim->cur_level >= batt_anim->frames[i].min_level &&
batt_anim->cur_level <= batt_anim->frames[i].max_level) {
batt_anim->cur_frame = i;
break;
}
}
// repeat the first frame first_frame_repeats times
disp_time = batt_anim->frames[batt_anim->cur_frame].disp_time *
batt_anim->first_frame_repeats;
}
}
}
/*設定起始幀之後，開始調用redraw_screen顯示充電畫面，包括文字*/
/* draw the new frame (@ cur_frame) */
healthd_draw->redraw_screen(charger->batt_anim, charger->surf_unknown);
/* if we don't have anim frames, we only have one image, so just bump
* the cycle counter and exit
*/
if (batt_anim->num_frames == 0 || batt_anim->cur_level < 0) {
LOGW("[%" PRId64 "] animation missing or unknown battery status\n", now);
charger->next_screen_transition = now + BATTERY_UNKNOWN_TIME;
batt_anim->cur_cycle++;
return;
}
/*顯示一幀需要等待的耗時*/
/* schedule next screen transition */
charger->next_screen_transition = now + disp_time;
/* advance frame cntr to the next valid frame only if we are charging
* if necessary, advance cycle cntr, and reset frame cntr
*/
if (charger->charger_connected) {
batt_anim->cur_frame++;
while (batt_anim->cur_frame < batt_anim->num_frames &&
(batt_anim->cur_level < batt_anim->frames[batt_anim->cur_frame].min_level ||
batt_anim->cur_level > batt_anim->frames[batt_anim->cur_frame].max_level)) {
batt_anim->cur_frame++;
}
/*第N輪顯示結束，進入第N+1輪顯示，直到cycle爲設置的最大的值，進入滅屏*/
if (batt_anim->cur_frame >= batt_anim->num_frames) {
batt_anim->cur_cycle++;
batt_anim->cur_frame = 0;
/* don't reset the cycle counter, since we use that as a signal
* in a test above to check if animation is over
*/
}
} else {
/* Stop animating if we're not charging.
* If we stop it immediately instead of going through this loop, then
* the animation would stop somewhere in the middle.
*/
batt_anim->cur_frame = 0;
batt_anim->cur_cycle++;
}
}
void HealthdDraw::redraw_screen(const animation* batt_anim, GRSurface* surf_unknown) {
clear_screen();
/* try to display *something* */
if (batt_anim->cur_level < 0 || batt_anim->num_frames == 0)
draw_unknown(surf_unknown);
else
draw_battery(batt_anim);
gr_flip();
}
顯示充電圖標，電量百分比和時間。
void HealthdDraw::draw_battery(const animation* anim) {
const animation::frame& frame = anim->frames[anim->cur_frame];
if (anim->num_frames != 0) {
draw_surface_centered(frame.surface);
LOGV("drawing frame #%d min_cap=%d time=%d\n", anim->cur_frame,
frame.min_level, frame.disp_time);
}
draw_clock(anim);
draw_percent(anim);
}
顯示充電圖標的實際爲draw_surface_centered，draw_percent爲顯示文字點亮百分比，默認代碼未初始化field.font，即字體font。使用minui默認字體進行顯示。
void HealthdDraw::draw_percent(const animation* anim) {
int cur_level = anim->cur_level;
if (anim->cur_status == BATTERY_STATUS_FULL) {
cur_level = 100;
}
if (cur_level < 0) return;
const animation::text_field& field = anim->text_percent;
if (field.font == nullptr || field.font->char_width == 0 ||
field.font->char_height == 0) {
return;
}
std::string str = base::StringPrintf("%d%%", cur_level);
int x, y;
determine_xy(field, str.size(), &x, &y);
LOGV("drawing percent %s %d %d\n", str.c_str(), x, y);
/*設置顏色,根據field.font指定的字體顯示百分比，x，y爲顯示的座標，顯示大小*/
由font指定*/
gr_color(field.color_r, field.color_g, field.color_b, field.color_a);
draw_text(field.font, x, y, str.c_str());
}
由於默認代碼field.font爲空，不會顯示電量百分比，添加以下代碼，用字體gr_font顯示百分比。gr_font的初始化在gr_init_font中。
/* bootable/recovery/minui/graphics.cpp*/
const GRFont* gr_sys_font() {
return gr_font;
}
gr_init_font() 初始化gr_font主要是兩個邏輯。
邏輯一：調用 int res = gr_init_font(“font”, &gr_font)；最終會根據name “font”，找到res/images/font.png，依據font.png初始化gr_font，然後return，不會進入邏輯二。font.png的位置在out目錄recovery/root/res/images/font.png。recovery模式下，就是走的這個流程。
/*build/make/core/Makefile默認使用bootable/recovery/fonts下的18x32.png初始化
*recovery模式下字體。*/
ifneq (,$(filter xxxhdpi 560dpi xxhdpi 400dpi xhdpi,$(recovery_density)))
recovery_font := $(call include-path-for, recovery)/fonts/18x32.png
else
recovery_font := $(call include-path-for, recovery)/fonts/12x22.png
endif
邏輯二：如果res/images/font.png不存在，就會根據"font_10x18.h"這個頭文件定義的font初始化，這個默認字體文件在源碼路徑bootable/recovery/minui/font_10x18.h。關機充電電量百分比顯示的字體格式根據此頭文件初始化，替換驗證。
/*bootable/recovery/minui/font_10x18.h*/
struct {
unsigned width;
unsigned height;
unsigned char_width;
unsigned char_height;
unsigned char rundata[2973];
} font = {
.width = 960,
.height = 18,
.char_width = 10,
.char_height = 18,
.rundata = {
......
}
static void update_screen_state(charger* charger, int64_t now) {
animation* batt_anim = charger->batt_anim;
int disp_time;
if (!batt_anim->run || now < charger->next_screen_transition) return;
if (healthd_draw == nullptr) {
if (healthd_config && healthd_config->screen_on) {
if (!healthd_config->screen_on(batt_prop)) {
LOGV("[%" PRId64 "] leave screen off\n", now);
batt_anim->run = false;
charger->next_screen_transition = -1;
if (charger->charger_connected) request_suspend(true);
return;
}
}
healthd_draw.reset(new HealthdDraw(batt_anim));
#ifndef CHARGER_DISABLE_INIT_BLANK
set_backlight(false);
healthd_draw->blank_screen(true);
#endif
}
......
}
HealthdDraw::HealthdDraw(animation* anim)
: kSplitScreen(HEALTHD_DRAW_SPLIT_SCREEN),
kSplitOffset(HEALTHD_DRAW_SPLIT_OFFSET) {
gr_init();
......
}
int gr_init() {
gr_init_font();
......
}
static void gr_init_font(void) {
/*邏輯一*/
int res = gr_init_font("font", &gr_font);
if (res == 0) {
return;
}
/*邏輯二*/
printf("failed to read font: res=%d\n", res);
// fall back to the compiled-in font.
gr_font = static_cast<GRFont*>(calloc(1, sizeof(*gr_font)));
gr_font->texture = static_cast<GRSurface*>(malloc(sizeof(*gr_font->texture)));
gr_font->texture->width = font.width;
gr_font->texture->height = font.height;
gr_font->texture->row_bytes = font.width;
gr_font->texture->pixel_bytes = 1;
unsigned char* bits = static_cast<unsigned char*>(malloc(font.width * font.height));
gr_font->texture->data = bits;
unsigned char data;
unsigned char* in = font.rundata;
while ((data = *in++)) {
memset(bits, (data & 0x80) ? 255 : 0, data & 0x7f);
bits += (data & 0x7f);
}
gr_font->char_width = font.char_width;
gr_font->char_height = font.char_height;
}
/*邏輯二recovery 模式下字體初始化,最終找到res/images/font.png*/
int gr_init_font(const char* name, GRFont** dest) {
......
int res = res_create_alpha_surface(name, &(font->texture));
if (res < 0) {
free(font);
return res;
}
......
}
PngHandler::PngHandler(const std::string& name) : error_code_(0), png_fp_(nullptr, fclose) {
std::string res_path = android::base::StringPrintf("/res/images/%s.png", name.c_str());
png_fp_.reset(fopen(res_path.c_str(), "rbe"));
if (!png_fp_) {
error_code_ = -1;
return;
}
......
}
充電圖標替換
不同於android6.0，android7.0及以上版本默認關機充電圖標已經變更一張battery_scale.png。修改默認關機充電圖標，實際上要替換battery_scale.png。
- battery_scale.png文件製作
利用系統源碼中的工具bootable/recovery/interlace-frames.py，即能將battery_scale.png拆分成幾張png圖片，也能將若干張png合成一張battery_scale.png。
- 拆分指令
python interlace-frames.py -d battery_scale.png -o battery.png
結果生成battery00.png~battery05.png共6個PNG文件，對應c源碼配置：
static animation::frame default_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 = 80,
.max_level = 95,
.surface = NULL,
},
{
.disp_time = 750,
.min_level = 0,
.max_level = 100,
.surface = NULL,
},
};
將生成的battery00.png~battery05.png替換成定製的充電圖片，並使用合併指令，重新生成新的battery_scale.png。
- 合併指令
python interlace-frames.py -o battery_scale.png oem/battery00.png oem/battery01.png oem/battery02.png oem/battery03.png oem/battery04.png oem/battery05.png
- 驗證方法
adb root
adb remount
setenforce 0
adb push battery_scale.png res/images/charger
adb reboot