android note【转】

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");

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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);
                }
        }

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init.rc

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

----------

on load_all_props_action
    load_all_props

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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"

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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 properties
  3 # 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

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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.img

2. 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

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3.charger

# init.rc
on charger
    class_start charger

----------

# init.qcom.rc
service charger /charger
    class charger

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#system/core/healthd/Android.mk 

LOCAL_MODULE := healthd
...
# Symlink /charger to /sbin/healthd

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4.屏幕截图 & 屏幕录制

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

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5.关闭selinux

setenforce 0

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6.adb devices 串号

(1)init.rc

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

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(2)cat /pro/cmdline

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adb root;adb shell cat /proc/cmdline

androidboot.serialno=YOGABOOK12 

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(3)init.cpp

process_kernel_cmdline
  ->import_kernel_cmdline(false, import_kernel_nv);
   ->import_kernel_nv

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    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",   "", },
        ...
    };

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7.system/bin/input 命令

demo

 input keyevent   keycodeNum    //4 表示KEYCODE_BACK

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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

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8. 重新挂载某个分区

mount -o remount,rw system system

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9.命令行查看分辨率

frameworks/base/cmds/wm/

窗口分辨率

wm size

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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");

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11.aplog

1.位置

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

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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

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3. ” BUG: “

搜索“ BUG： ”会有栈回溯或者null point信息

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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 :

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12. 指定工程的 .config

KERNEL_DEFCONFIG

device/intel/cherrytrail/cht_ffd/AndroidBoard.mk

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13. Android.mk中添加打印

 $(warning "print info")

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14.U盘插入拔出打印

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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

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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 

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15.U盘插入拔出mount/umount代码流程

1.监听subsystem为block 的uevent事件

    NetlinkHandler::onEvent
        VolumeManager::handleBlockEvent
            case 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);

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2.发送广播

    Disk::notifyEvent
             VolumeManager::Instance()->getBroadcaster()->sendBroadcast

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3.mountService接收来着vold的广播

    MountService.onEvent
        MountService.onEventLocked
            case 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

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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());

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16.查看android分区及dd命令烧写分区

#ls /dev/block/by-name/
    android_boot
    android_bootloader
    android_bootloader2
    android_cache
    android_config
    android_data
    android_factory
    android_metadata
    android_misc
    android_persistent
    android_recovery
    android_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.

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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());

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18.android 分区大小设置

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

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19.android framwork打印调用栈

// c++ 代码
#include <utils/CallStack.h>
...
CallStack stack;
stack.update();
stack.dump();

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// java 代码
Log.d(TAG,Log.getStackTraceString(new Throwable()));  

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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

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21.modern

./mk johnson-eng update-none-hlos.bin

vendor/qcom/non-hlos/MSM8953.LA.2.0/common/build/bin/asic/NON-HLOS.bin

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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。

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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

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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

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25.charge log mask

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

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26.各模块JNI层代码

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26.1 surfaceflinger

android_view_Surface.cpp
static const JNINativeMethod gSurfaceMethods[] = {

demo
SurfaceTest.cpp

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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）

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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",

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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 5555

2. 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