本文转载自：http://blog.csdn.net/u012719256/article/details/52094982

1.重要的property属性

 #define ANDROID_RB_PROPERTY "sys.powerctl"  // 控制启动状态property_set(ANDROID_RB_PROPERTY, "shutdown,");property_set(ANDROID_RB_PROPERTY, "reboot,bootloader"); property_set(ANDROID_RB_PROPERTY, "reboot,"); property_set(ANDROID_RB_PROPERTY, "reboot,edl");

2.propety属性的管理

init.c

   if (is_charger){action_for_each_trigger("charger", action_add_queue_tail);}else{if (is_ffbm) { action_for_each_trigger("ffbm", action_add_queue_tail); } else { // 正常开机模式进入最后的 late-init 阶段 action_for_each_trigger("late-init", action_add_queue_tail); } }

init.rc

on late-inittrigger load_all_props_action  // 在late-init阶段加载所有的属性---------- on load_all_props_action load_all_props

keywords.h property_service.c

    KEYWORD(load_all_props,  COMMAND, 0, do_load_all_props)        //keywords.h-> do_load_all_props   // builtins.c->load_all_props // property_service.c // 依次从下面几个路径中加载所有的属性 "system/build.prop" (常用) "system/default.prop"

build/tools/buildinfo.sh

☆ 生成 system/build.prop 文件，需要添加prop只需要在这个编译脚本中添加即可！！！

in system/build.prop# begin build properties3 # autogenerated by buildinfo.sh 4 ro.build.id=LMY47V 5 ro.build.display.id=LMY47V.WW_Phone.12.0.0.020-20160719_userdebug 6 ro.build.display.wtid=LMY47V.WW_Ph

3.属性值的获取设置

1. 在system.prop里面添加需要使用的系统属性，添加完后需要编译生成system.img2. 在native层，使用property_set(...)和property_get(...)来存取系统属性3. 在Java层， 使用SystemProperties.set(...)和SystemProperties.get(...)来存取系统属性 4. 在adb shell命令行，使用getprop和setprop来存取系统属性

3.charger

# init.rc
on chargerclass_start charger----------# init.qcom.rc
service charger /chargerclass charger----------#system/core/healthd/Android.mk LOCAL_MODULE := healthd
...
# Symlink /charger to /sbin/healthd

4.屏幕截图 & 屏幕录制

adb shell screencap /sdcard/test.png
adb shell screenrecord  sdcard/sss.mp4

5.关闭selinux

setenforce 0

6.adb devices 串号

(1)init.rc

 write /sys/class/android_usb/android0/iSerial ${ro.serialno}

(2)cat /pro/cmdline

adb root;adb shell cat /proc/cmdline

androidboot.serialno=YOGABOOK12

(3)init.cpp


process_kernel_cmdline->import_kernel_cmdline(false, import_kernel_nv);->import_kernel_nv----------char *value = strchr(name, '=');(!strncmp(name, "androidboot.", 12) && name_len > 12) {char *boot_prop_name = name + 12; char prop[PROP_NAME_MAX]; snprintf(prop, sizeof(prop), "ro.boot.%s", boot_prop_name); property_set(prop, value); } ---------- static void export_kernel_boot_props() { struct { const char *src_prop; const char *dst_prop; const char *default_value; } prop_map[] = { ... { "ro.boot.serialno", "ro.serialno", "", }, ... };

7.system/bin/input 命令

demo

 input keyevent   keycodeNum    //4 表示KEYCODE_BACK

常用的几种事件：

//键值对应 android/keycodes.h
26 --> KEYCODE_POWER         // 电源
82 -->  "KEYCODE_MENU" //菜单 3 --> "KEYCODE_HOME" //返回home 4 --> "KEYCODE_BACK" //返回上一级菜单 19 --> "KEYCODE_DPAD_UP" //向上 20 --> "KEYCODE_DPAD_DOWN" //向下 21 --> "KEYCODE_DPAD_LEFT" //向左 22 --> "KEYCODE_DPAD_RIGHT" //向右 24 --> "KEYCODE_VOLUME_UP" //音量加 25 --> "KEYCODE_VOLUME_DOWN" //音量减 66 --> "KEYCODE_ENTER" //确定键

8. 重新挂载某个分区

mount -o remount,rw system system

9.命令行查看分辨率

frameworks/base/cmds/wm/

窗口分辨率

wm size

10.android init阶段 bootanimation之前的一张启动画面

// 在init.c中通过 “console_init” 这个action触发queue_builtin_action(console_init_action, "console_init");

11.aplog

1.位置

/data/logs/aplog.n
data/local/log/aplog

2.crash信息

//logs\crashlog0_72612f74d4e263a53665\crashfile 中表明了crash原因EVENT=CRASH
ID=61c96fdba2162a052323
SN=4cca94f595db403f749622792dfe73a6167ded48
DATE=2016-10-08/08:09:56
UPTIME=0000:00:19 BUILD=YB-Q501L_USR_S000014_1610010228_WW12_ROW,Lenovo/yogi_12_row_lte/YOGABOOK12:6.0.1/MMB29M/1610010228:user/release-keys,3.14.55-x86_64,queen@fyy-SMBIOSfyy,unknown,YOGI.T2000AH.V015,,,, BOARD=Lenovo YB-Q501L IMEI= TYPE=SWWDT_UNHANDLED // crash 类型 看门狗 DATA_READY=1 OPERATOR=UNKNOWN DATA0=SWWDT_RESET // _END ---------- EVENT=CRASH ID=72612f74d4e263a53665 SN=7f406c2f2e2675c73a5a85d52a237d80f747c2ea DATE=2016-10-07/21:23:08 UPTIME=0000:00:22 BUILD=YB-Q501L_USR_S000014_1610010228_WW12_ROW,Lenovo/yogi_12_row_lte/YOGABOOK12:6.0.1/MMB29M/1610010228:user/release-keys,3.14.55-x86_64,queen@fyy-SMBIOSfyy,unknown,YOGI.T2000AH.V015,,,, BOARD=Lenovo YB-Q501L IMEI= TYPE=IPANIC // // crash 类型 kernel panic DATA_READY=1 OPERATOR=UNKNOWN _END

3. ” BUG: “

搜索“ BUG： ”会有栈回溯或者null point信息

2.kernel启动信息/重启信息

beginning of kernel
10-07 21:22:46.780 0 0 I KERNEL : [ 0.000000] Initializing cgroup subsys cpuset
10-07 21:22:46.780 0 0 I KERNEL : [ 0.000000] Initializing cgroup subsys cpu
10-07 21:22:46.780 0 0 I KERNEL : [ 0.000000] Initializing cgroup subsys cpuacct
10-07 21:22:46.780 0 0 I KERNEL : [ 0.000000] Linux version 3.14.55-x86_64 (queen@fyy-SMBIOSfyy) (gcc version 4.9.2 (GCC) ) #1 SMP PREEMPT Sat Oct 1 03:04:35 CST 2016
10-07 21:22:46.780 0 0 I KERNEL : [ 0.000000] Command line: androidboot.bootloader=yogi_t2000ah_v015_kernelflinger-02_1f androidboot.diskbus=10.0 androidboot.verifiedbootstate=green androidboot.bootreason=kernel_panic androidboot.mode=0 :

12. 指定工程的 .config

KERNEL_DEFCONFIG

device/intel/cherrytrail/cht_ffd/AndroidBoard.mk

13. Android.mk中添加打印

 $(warning "print info")

14.U盘插入拔出打印

1.mountservice 完整流程

     MountService: Volume public:8,1 broadcasting checking to UserHandle{0}  // 插入后检测挂载MountService: Volume public:8,1 broadcasting mounted to UserHandle{0} MountService: Volume public:8,1 broadcasting ejecting to UserHandle{0} // 点击弹出umount MountService: Volume public:8,1 broadcasting unmounted to UserHandle{0} MountService: Volume public:8,1 broadcasting removed to UserHandle{0} // 拔出U盘

2.kernelU盘插入拔出kernel打印

usb 2-1: new SuperSpeed USB device number 2 using xhci_hcd  // 插上 30375936 512-byte logical blocks: (15.5 GB/14.4 GiB)  // 读取大小 USB disconnect, device number  // 拔出

15.U盘插入拔出mount/umount代码流程

1.监听subsystem为block 的uevent事件

    NetlinkHandler::onEventVolumeManager::handleBlockEventcase add:Disk::create // disk.cpp disk::readMetadata(); disk::readPartitions(); notifyEvent(ResponseCode::DiskCreated, StringPrintf("%d", mFlags)); case chager: disk::readMetadata(); disk::readPartitions(); case remove: Disk::destroy() destroyAllVolumes(); notifyEvent(ResponseCode::DiskDestroyed);

2.发送广播

    Disk::notifyEventVolumeManager::Instance()->getBroadcaster()->sendBroadcast

3.mountService接收来着vold的广播

MountService.onEventMountService.onEventLockedcase VoldResponseCode.VOLUME_STATE_CHANGED:  //每一次状态的改变都会调用这个分支onVolumeStateChangedLocked(vol, oldState, newState);  // 状态改变做相应操作mHandler.obtainMessage(H_VOLUME_BROADCAST, userVol).sendToTarget(); // mountService发广播给mountService

3.mountService接收来着mountService的广播


MountServiceHandler.handleMessage  //接收广播case H_VOLUME_MOUNT:         // 挂载mConnector.execute("volume", "mount", vol.id, vol.mountFlags,vol.mountUserId); case H_VOLUME_BROADCAST: // 发送广播给用户告知状态 Slog.d(TAG, "Volume " + userVol.getId() + " broadcasting " + envState + " to "+ userVol.getOwner()); mContext.sendBroadcastAsUser(intent, userVol.getOwner());

16.查看android分区及dd命令烧写分区

#ls /dev/block/by-name/android_bootandroid_bootloaderandroid_bootloader2android_cacheandroid_configandroid_dataandroid_factoryandroid_metadataandroid_miscandroid_persistentandroid_recoveryandroid_system----------push boot.img到及机子的任意目录,在此目录执行 ,dd if=boot.img of=/dev/block/by-name/android_boot,重启之后,boot.img烧写成功.其他分区也类似.

17.android 各层次获取时间的方法

1. 在Java层，long now = SystemClock.uptimeMillis();2. 在native层，nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);3. 在驱动层，s64 time = ktime_to_us(ktime_get());

18.android 分区大小设置

vendor/qcom/non-hlos/MSM8953.LA.2.0/common/config/partition.xml

19.android framwork打印调用栈

// c++ 代码
#include <utils/CallStack.h>
...
CallStack stack;
stack.update();
stack.dump();----------// java 代码
Log.d(TAG,Log.getStackTraceString(new Throwable()));

20.快速编译打包bootimage和system

make kernel：只重新编译kernel部分镜像，但是不会打包更新boot.img
make bootimage-nodeps：不会编译kernel以及ramdisk，只会将out目录中现有的kernel和ramdisk.img重新打包一次生成boot.img
make ramdisk：只重新编译ramdisk镜像，生成ramdisk.img，但是不会打包更新boot.img
make ramdisk-nodeps：不会编译ramdisk，只会将out目录中现有的文件重新打包一次。out/target/product/hq6737t_66_1ha_m0/root，比如更改了init..rc之类的文件，只需要修改out/…/root/中对应的文件，然后重新用此命令打包一次，就会生成一个包含更改过init..rc的ramdisk.img
make snod：打包system

21.modern

./mk johnson-eng update-none-hlos.bin vendor/qcom/non-hlos/MSM8953.LA.2.0/common/build/bin/asic/NON-HLOS.bin

22.Qcom 开机后继续打印串口log

主要是修改 persist.console.silent.config 属性，persist.console.silent.config = 1是不打印， persist.console.silent.config = 0继续打印。 修改的文件， 将手机中的build.prop导出， 直接修改，再push进去； 修改 device/qcom/msmXXX/system.prop，编译systemimage。

23.关闭selinux


when build, open the CONFIG_SECURITY_SELINUX_DEVELOP, add then append the " androidboot.selinux=permissive" in commandline. or in device/qcom/msmxxxx/system.prop, add ro.boot.selinux=disable

24.sbl检测电池是否在位

Non-HOLS/BOOT.BF.3.3/boot_images/core/systemdrivers/pmic/app/chg/src/pm_app_smbchg.c 里有个检测电池在不在的函数，Check Battery presence

25.charge log mask

qpnp-smbcharger.c:
+ #define DEBUG
- static int smbchg_debug_mask;
+ static int smbchg_debug_mask = 0xFF;

26.各模块JNI层代码

26.1 surfaceflinger

android_view_Surface.cpp
static const JNINativeMethod gSurfaceMethods[] = {demo
SurfaceTest.cpp

27.input keyevent 命令

对应的键值 frameworks/native/include/android/keycodes.h

$adb shell input keyevent 26            // power$adb shell input keyevent 4 //模拟返回键（BACK） $adb shell input keyevent 82 //模拟菜单键（MENU） $adb shell input keyevent 3 //模拟主页键（HOME）

28.inpudispatch中添加tp报点

--- a/frameworks/native/services/inputflinger/InputDispatcher.cpp
+++ b/frameworks/native/services/inputflinger/InputDispatcher.cpp
@@ -2483,15 +2483,16 @@ bool InputDispatcher::shouldSendKeyToInputFilterLocked(const NotifyKeyArgs* args } void InputDispatcher::notifyMotion(const NotifyMotionArgs* args) { -#if DEBUG_INBOUND_EVENT_DETAILS - ALOGD("notifyMotion - eventTime=%lld, deviceId=%d, source=0x%x, policyFlags=0x%x, " + ALOGE("zch----in notifyMotion"); +#if 1 + ALOGE("notifyMotion - eventTime=%lld, deviceId=%d, source=0x%x, policyFlags=0x%x, " "action=0x%x, actionButton=0x%x, flags=0x%x, metaState=0x%x, buttonState=0x%x," "edgeFlags=0x%x, xPrecision=%f, yPrecision=%f, downTime=%lld", args->eventTime, args->deviceId, args->source, args->policyFlags, args->action, args->actionButton, args->flags, args->metaState, args->buttonState, args->edgeFlags, args->xPrecision, args->yPrecision, args->downTime); for (uint32_t i = 0; i < args->pointerCount; i++) { - ALOGD(" Pointer %d: id=%d, toolType=%d, " + ALOGE(" Pointer %d: id=%d, toolType=%d, " "x=%f, y=%f, pressure=%f, size=%f, " "touchMajor=%f, touchMinor=%f, toolMajor=%f, toolMinor=%f, " "orientation=%f",

29.wifi连接adb

1. 在目标板上通过使用以太网连接来配置adb守护进程，使用setprop来设置守护进程的端口号# setprop service.adb.tcp.port 55552. 如果以上配置成功，再重启目标板上的adbd服务# stop adbd# start adbd 3. 在主机端使用如下命令建立adb连接 export ADBHOST=<target's ip address> adb kill-server adb start-server adb connect <target_ip_address>:5555 4. 使用如下命令确认设备连接成功 adb devices 设备连接成功后将出现设备序列号和名称

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