以前在4.4系统上做个一个关于双开机logo的切换的需求，现在把一些当时的技术细节记录如下，以做后续参考：
MT8312 android 4.4 logo 分为三个部分：uboot( lk )、kernel( libshowlogo )、android ( bootanimation )。
方法说明：
- 通过mtk的系统保留分区pro_info分区存放全局的系统变量，然后分别在uboot,kernel和android层去读取对应的值进行logo切换。
- 在拨号盘采用”*#*#556#*#*”的方式进行双Logo的变量值的更改，目前设计有3个值，但仅用一个值作为判断，保留3个值作为后续扩展使用。
主要步骤如下：
一、增加文件：
1. 在mediatek/custom/common/lk/logo/对应的目录下增加文件，按照如下方式命名为：xxxx_kernel0.bmp,xxxx_uboot0.bmp，如：wsvga_uboot0.bmp，wsvga_kernel0.bmp
2. 在frameworks/base/data/sounds/目录下增加bootanimation.zip文件，或者直接将文件拷贝至：out\target\product\{project}\system\media目录下，运行：./mk {project} snod打包到系统。
3. 修改mediatek/custom/common/lk/logo/rules.mk文件，保证编译时可以增加文件到系统。
具体修改例子如下：
# add for double logo ifeq ($(MTK_DOUBLE_LOGO_SUPPORT),yes) RESOURCE_OBJ_LIST += \ $(BOOT_LOGO_DIR)/$(BOOT_LOGO)/$(BOOT_LOGO)_uboot0.raw \ $(BOOT_LOGO_DIR)/$(BOOT_LOGO)/$(BOOT_LOGO)_kernel0.raw endif
4. 修改frameworks/base/data/sounds/OriginalAudio.mk，增加如下内容：
$(LOCAL_PATH)/bootanimation.zip:system/media/bootanimation.zip
5. 在mediatek/custom/common/lk/include/target/cust_display.h中增加对应logoindex 的宏，保证第3点中的rules.mk中序号与该文件一致，如：
#ifdef MTK_DOUBLE_LOGO_SUPPORT #define BOOT_LOGO_OTHER_INDEX 39 #define KEL_LOGO_OTHER_INDEX 40 #endif
二、修改pro_info的配置，增加变量值：
1. 修改 CFG_PRODUCT_INFO_File.h，增加变量：
typedef struct{
unsigned char barcode[64];
nvram_ef_imei_imeisv_struct IMEI[4];
unsigned char logoinfo[3]; // add for double logo
unsigned char reserved[1024-40-64-3];
}PRODUCT_INFO_SAMPLE;
路径：mediatek/custom/{project}/cgen/cfgfileinc/
2. 修改：CFG_PRODUCT_INFO_Default.h，使两个文件保持一致。
路径：mediatek/custom/{project}/cgen/cfgdefault/
三、修改lk双logo切换:
1. 修改mediatek/platform/mt6582/lk/load_image.c增加nvram读取的函数及对应的变量值，函数主要内容如下：
int mboot_common_get_logo_info()
{
unsigned long begin;
long len;
#ifdef MTK_EMMC_SUPPORT
unsigned long long start_addr;
#else
unsigned long start_addr;
#endif
part_t *part;
part_dev_t *dev;
u8* data;
char part_name[]="PRO_INFO";
PRODUCT_INFO_SAMPLE *pro_info;
dev = mt_part_get_device();
if (!dev)
{
return -ENODEV;
}
part = mt_part_get_partition(part_name);
if (!part)
{
return -ENOENT;
}
#ifdef MTK_EMMC_SUPPORT
start_addr = (u64)part->startblk * 512;
#else
start_addr = part->startblk * 512;
#endif
printf("part->startblk == 0x%lx\n",part->startblk);
printf("start_addr000 == 0x%x\n",start_addr);
pro_info = (PRODUCT_INFO_SAMPLE*)malloc(sizeof(PRODUCT_INFO_SAMPLE));
begin = get_timer(0);
//****************
//* read image data
//*
//****************
len = dev->read(dev, start_addr, (uchar*)pro_info, sizeof(PRODUCT_INFO_SAMPLE));
if (len < 0) { len = -EIO; goto exit; } logoInfo[0]=pro_info->logoinfo[0];
logoInfo[1]=pro_info->logoinfo[1];
logoInfo[2]=pro_info->logoinfo[2];
printf("[logoinfo]=======logoinfo[0]= %d,logoinfo[1]=%d,logoinfo[2]=%d\n",logoInfo[0],logoInfo[1],logoInfo[2]);
exit:
if (pro_info)
free(pro_info);
return 0;
}
2. 在mediatek/platform/mt6582/lk/mt_logo.c中修改进行双logo切换判断，在函数 mt_disp_show_boot_logo()中增加如下内容进行切换：
mboot_common_get_logo_info();
if(get_logoinfo_value(0) == 0)
{
fill_animation_logo(BOOT_LOGO_INDEX, mt_get_fb_addr(), mt_get_tempfb_addr(), logo_addr, phical_screen);
}
else if(get_logoinfo_value(0) == 1)
{
fill_animation_logo(BOOT_LOGO_OTHER_INDEX, mt_get_fb_addr(), mt_get_tempfb_addr(), logo_addr, phical_screen);
}
四、kernel双logo切换：
1. 修改mediatek/external/libshowlogo/charging_animation.cpp，增加如下函数：
static int get_logo_flag(int index)
{
F_ID fid;
int rec_size = 0;
int rec_num = 0;
bool isread = true;
int logo_flag_lid = AP_CFG_REEB_PRODUCT_INFO_LID;
PRODUCT_INFO_SAMPLE_0 *logo_flag_struct;
logo_flag_struct= (PRODUCT_INFO_SAMPLE_0 *)malloc(sizeof(PRODUCT_INFO_SAMPLE_0));
if(logo_flag_struct == NULL)
{
return false;
}
fid = NVM_GetFileDesc(logo_flag_lid, &rec_size, &rec_num, isread);
if(fid.iFileDesc < 0)
{
LOG_ANIM("fid.iFileDesc < 0"); return false; } if(rec_size != read(fid.iFileDesc, logo_flag_struct, rec_size)) { free(logo_flag_struct); return false; } logoinfo[0]= logo_flag_struct->logoinfo[0];
logoinfo[1]= logo_flag_struct->logoinfo[1];
logoinfo[2]= logo_flag_struct->logoinfo[2];
free(logo_flag_struct);
if(!NVM_CloseFileDesc(fid))
{
return false;
}
return logoinfo[index];
}
2. 修改show_kernel_logo()函数，如下：
#ifdef MTK_DOUBLE_LOGO_SUPPORT
if(get_logo_flag(0) == 0)
{
anim_show_logo(kernel_logo_position);
}
else if (get_logo_flag(0) == 1)
{
anim_show_logo(KEL_LOGO_OTHER_INDEX);
}
#else
anim_show_logo(kernel_logo_position);
#endif
2. 修改mediatek/external/libshowlogo/Android.mk，保证函数的调用时，可以正确编译链接，修改如下：
LOCAL_SHARED_LIBRARIES += libnvram LOCAL_C_INCLUDES += $(MTK_PATH_CUSTOM)/cgen/inc LOCAL_C_INCLUDES += $(MTK_PATH_SOURCE)/external/nvram/libnvram
五、android双logo切换：
1. 按照第四条的说明1，2修改增加函数及Android.mk，获取pro_info的值，具体文件如下：
frameworks/base/cmds/bootanimation/Android.mk frameworks/base/cmds/bootanimation/BootAnimation.cpp
2. 修改void BootAnimation::getResourceFile(int index, void * path) ,在如下判断中增加条件：
#ifdef MTK_DOUBLE_LOGO_SUPPORT
if ((access(pathAddr, R_OK) == 0) && (mZip.open(pathAddr)
== NO_ERROR)&& (get_logo_flag(0) == 1))
#else
if ((access(pathAddr, R_OK) == 0) && (mZip.open(pathAddr)
== NO_ERROR))
#endif
3. 修改bootanimation server 的用户和用户组,mediatek/config/mt6582/init.rc。
service bootanim /system/bin/bootanimation class main #user graphics user root #group graphics media group root graphics media disabled oneshot
六、修改拨号盘，增加切换动作：
1. 拷贝mediatek/packages/apps/NvRAM/NvRAMAgent.java到packages/apps/Dialer/src/com/android/dialer/
2. 修改packages/apps/Dialer/src/com/android/dialer/dialpad/DigitsEditText.java，增加对于判断的切换：
2.1 增加如下package
import com.android.dialer.NvRAMAgent; import android.os.ServiceManager; import android.os.IBinder; import com.mediatek.common.featureoption.FeatureOption;
2.2 增加函数：
public void writeData(int n) {
IBinder binder = ServiceManager.getService("NvRAMAgent");
NvRAMAgent agent = NvRAMAgent.Stub.asInterface(binder);
byte[] by = getBytes(n);
for(int i=104;i<107;i++){ buff[i] = by[i-104]; try { int flag = agent.writeFile(file_lid, buff); if (flag > 0) {
//System.out.println("write success");
} else {
//System.out.println("write failed");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public int readData() {
IBinder binder = ServiceManager.getService("NvRAMAgent");
NvRAMAgent agent = NvRAMAgent.Stub.asInterface(binder);
try {
buff = agent.readFile(file_lid);// read buffer from nvram
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
int b = (int)buff[104];
//System.out.println("b:"+b);
return b;
}
3. 增加界面显示及切换调用：
@Override
protected void onTextChanged(CharSequence text, int start, int before,
int after) {
if(FeatureOption.MTK_DOUBLE_LOGO_SUPPORT){
if (text.toString().equals("*#*#556#*#*")) {
if(readData() == 1)
{
writeData(0);
Toast.makeText(getContext(), "Reset Logo", Toast.LENGTH_SHORT).show();
}
else
{
writeData(1);
Toast.makeText(getContext(), "Update Logo", Toast.LENGTH_SHORT).show();
}
//this.setText("");
}
}
super.onTextChanged(text, start, before, after);
}
七、修改文件列表
# modified: frameworks/base/cmds/bootanimation/Android.mk # modified: frameworks/base/cmds/bootanimation/BootAnimation.cpp # modified: frameworks/base/data/sounds/OriginalAudio.mk # modified: mediatek/build/tools/javaoption.pm # modified: mediatek/config/mt6582/init.rc # modified: mediatek/config/m874v3/ProjectConfig.mk # modified: mediatek/custom/common/lk/include/target/cust_display.h # modified: mediatek/custom/common/lk/logo/rules.mk # modified: mediatek/custom/m874v3/cgen/cfgdefault/CFG_PRODUCT_INFO_Default.h # modified: mediatek/custom/m874v3/cgen/cfgfileinc/CFG_PRODUCT_INFO_File.h # modified: mediatek/external/libshowlogo/Android.mk # modified: mediatek/external/libshowlogo/charging_animation.cpp # modified: mediatek/external/libshowlogo/show_animation_common.h # modified: mediatek/platform/mt6582/lk/load_image.c # modified: mediatek/platform/mt6582/lk/mt_logo.c # modified: packages/apps/Dialer/src/com/android/dialer/dialpad/DigitsEditText.java
增加的文件：
packages/apps/Dialer/src/com/android/dialer/NvRAMAgent.java
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