Android 9.0 关机流程分析
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本篇文章主要介绍 Android 开发中的部分知识点，通过阅读本篇文章，您将收获以下内容:
1.ShutdownThread 概述
1.ShutdownThread 概述
关机线程实现类
Android关机线程实现类frameworks/base/services/core/java/com/android/server/power/ShutdownThread.java
ShutdownThread 大致流程
关机线程大致流程
ShutdownThread 部分静态变量如下：
public final class ShutdownThread extends Thread {
// constants
private static final String TAG = "ShutdownThread";
private static final int ACTION_DONE_POLL_WAIT_MS = 500;
private static final int RADIOS_STATE_POLL_SLEEP_MS = 100;
// maximum time we wait for the shutdown broadcast before going on.
private static final int MAX_BROADCAST_TIME = 10*1000;
private static final int MAX_SHUTDOWN_WAIT_TIME = 20*1000;
private static final int MAX_RADIO_WAIT_TIME = 12*1000;
private static final int MAX_UNCRYPT_WAIT_TIME = 15*60*1000;
// constants for progress bar. the values are roughly estimated based on timeout.
private static final int BROADCAST_STOP_PERCENT = 2;
private static final int ACTIVITY_MANAGER_STOP_PERCENT = 4;
private static final int PACKAGE_MANAGER_STOP_PERCENT = 6;
private static final int RADIO_STOP_PERCENT = 18;
private static final int MOUNT_SERVICE_STOP_PERCENT = 20;
// Time we should wait for vendor subsystem shutdown
// Sleep times(ms) between checks of the vendor subsystem state
private static final int VENDOR_SUBSYS_STATE_CHECK_INTERVAL_MS = 100;
// Max time we wait for vendor subsystems to shut down before resuming
// with full system shutdown
private static final int VENDOR_SUBSYS_MAX_WAIT_MS = 10000;
// length of vibration before shutting down
private static final int SHUTDOWN_VIBRATE_MS = 500;
... ...
}
ShutdownThread 无参构造方法
private ShutdownThread() {
}
2. shutdown 关机方法
长按 ·Power· 键调用 shutdown方法，通过调用内部shutdownInner方法，实现 弹出 关机 、重启对话框，供用户选择关机 或者重启。
/**
* Request a clean shutdown, waiting for subsystems to clean up their
* state etc. Must be called from a Looper thread in which its UI
* is shown.
*
* @param context Context used to display the shutdown progress dialog. This must be a context
* suitable for displaying UI (aka Themable).
* @param reason code to pass to android_reboot() (e.g. "userrequested"), or null.
* @param confirm true if user confirmation is needed before shutting down.
*/
public static void shutdown(final Context context, String reason, boolean confirm) {
mReboot = false;
mRebootSafeMode = false;
mReason = reason;
shutdownInner(context, confirm); // 详见分析3
}
3.shutdownInner 方法实现
shutdownInner 主要作用是Behavior。Dialog。
private static void shutdownInner(final Context context, boolean confirm) {
// ShutdownThread is called from many places, so best to verify here that the context passed
// in is themed.
context.assertRuntimeOverlayThemable();
// ensure that only one thread is trying to power down.
// any additional calls are just returned
synchronized (sIsStartedGuard) {
if (sIsStarted) {
Log.d(TAG, "Request to shutdown already running, returning.");
return;
}
}
// 获取用户长按Power键的处理行为
final int longPressBehavior = context.getResources().getInteger(
com.android.internal.R.integer.config_longPressOnPowerBehavior);
final int resourceId = mRebootSafeMode
? com.android.internal.R.string.reboot_safemode_confirm
: (longPressBehavior == 2
? com.android.internal.R.string.shutdown_confirm_question
: com.android.internal.R.string.shutdown_confirm);
Log.d(TAG, "Notifying thread to start shutdown longPressBehavior=" + longPressBehavior);
if (confirm) {
//注册关机对话框广播 详细实现见 4
final CloseDialogReceiver closer = new CloseDialogReceiver(context);
if (sConfirmDialog != null) {
sConfirmDialog.dismiss();
}
// 创建关机Dialg 详见 实现5
sConfirmDialog = new AlertDialog.Builder(context)
.setTitle(mRebootSafeMode
? com.android.internal.R.string.reboot_safemode_title
: com.android.internal.R.string.power_off)
.setMessage(resourceId)
.setPositiveButton(com.android.internal.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// 开始一系列的关机流程，详见 6
beginShutdownSequence(context);
}
})
.setNegativeButton(com.android.internal.R.string.no, null)
.create();
closer.dialog = sConfirmDialog;
sConfirmDialog.setOnDismissListener(closer);
sConfirmDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
sConfirmDialog.show();
} else {
beginShutdownSequence(context);
}
}
其中 config_longPressOnPowerBehavior 用来控制用户长按Power键触发的行为。
1
此源码 可以在 config.xml中查看，代码目录如下：frameworks\base\core\res\res\values\config.xml
4.CloseDialogReceiver 注册关机对话框广播
注册action 为ACTION_CLOSE_SYSTEM_DIALOGS广播接收器。
private static class CloseDialogReceiver extends BroadcastReceiver
implements DialogInterface.OnDismissListener {
private Context mContext;
public Dialog dialog;
CloseDialogReceiver(Context context) {
mContext = context;
IntentFilter filter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
context.registerReceiver(this, filter);
}
@Override
public void onReceive(Context context, Intent intent) {
dialog.cancel();
}
public void onDismiss(DialogInterface unused) {
mContext.unregisterReceiver(this);
}
}
5. new sConfirmDialog 显示关机对话框
Android原生关机对话框如下：
关机对话框创建
// 创建关机Dialg 详见 实现5
sConfirmDialog = new AlertDialog.Builder(context)
.setTitle(mRebootSafeMode
? com.android.internal.R.string.reboot_safemode_title
: com.android.internal.R.string.power_off)
.setMessage(resourceId)
.setPositiveButton(com.android.internal.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// 开始一系列的关机流程，详见 6
beginShutdownSequence(context);
}
})
.setNegativeButton(com.android.internal.R.string.no, null)
.create();
closer.dialog = sConfirmDialog;
sConfirmDialog.setOnDismissListener(closer);
sConfirmDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
sConfirmDialog.show();
6. beginShutdownSequence开始关机流程
beginShutdownSequence开始一系列关机流程，主要功能如下：ShutdownThead 线程。
private static void beginShutdownSequence(Context context) {
synchronized (sIsStartedGuard) {
if (sIsStarted) {
Log.d(TAG, "Shutdown sequence already running, returning.");
return;
}
sIsStarted = true;
}
// 显示关机进度对话框 详见 7
sInstance.mProgressDialog = showShutdownDialog(context);
sInstance.mContext = context;
sInstance.mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
// make sure we never fall asleep again
sInstance.mCpuWakeLock = null;
try {
sInstance.mCpuWakeLock = sInstance.mPowerManager.newWakeLock(
PowerManager.PARTIAL_WAKE_LOCK, TAG + "-cpu");
sInstance.mCpuWakeLock.setReferenceCounted(false);
sInstance.mCpuWakeLock.acquire();
} catch (SecurityException e) {
Log.w(TAG, "No permission to acquire wake lock", e);
sInstance.mCpuWakeLock = null;
}
// also make sure the screen stays on for better user experience
sInstance.mScreenWakeLock = null;
if (sInstance.mPowerManager.isScreenOn()) {
try {
sInstance.mScreenWakeLock = sInstance.mPowerManager.newWakeLock(
PowerManager.FULL_WAKE_LOCK, TAG + "-screen");
sInstance.mScreenWakeLock.setReferenceCounted(false);
sInstance.mScreenWakeLock.acquire();
} catch (SecurityException e) {
Log.w(TAG, "No permission to acquire wake lock", e);
sInstance.mScreenWakeLock = null;
}
}
if (SecurityLog.isLoggingEnabled()) {
SecurityLog.writeEvent(SecurityLog.TAG_OS_SHUTDOWN);
}
// 启动 关机线程 ，执行 Run 方法，详见 9
sInstance.mHandler = new Handler() {
};
sInstance.start();
}
7.showShutdownDialog 显示关机进度对话框
showShutdownDialog主要用来显示关机进度对话框
private static ProgressDialog showShutdownDialog(Context context) {
// Throw up a system dialog to indicate the device is rebooting / shutting down.
ProgressDialog pd = new ProgressDialog(context);
// Path 1: Reboot to recovery for update
// Condition: mReason startswith REBOOT_RECOVERY_UPDATE
//
// Path 1a: uncrypt needed
// Condition: if /cache/recovery/uncrypt_file exists but
// /cache/recovery/block.map doesn't.
// UI: determinate progress bar (mRebootHasProgressBar == True)
//
// * Path 1a is expected to be removed once the GmsCore shipped on
// device always calls uncrypt prior to reboot.
//
// Path 1b: uncrypt already done
// UI: spinning circle only (no progress bar)
//
// Path 2: Reboot to recovery for factory reset
// Condition: mReason == REBOOT_RECOVERY
// UI: spinning circle only (no progress bar)
//
// Path 3: Regular reboot / shutdown
// Condition: Otherwise
// UI: spinning circle only (no progress bar)
// mReason could be "recovery-update" or "recovery-update,quiescent".
if (mReason != null && mReason.startsWith(PowerManager.REBOOT_RECOVERY_UPDATE)) {
// We need the progress bar if uncrypt will be invoked during the
// reboot, which might be time-consuming.
mRebootHasProgressBar = RecoverySystem.UNCRYPT_PACKAGE_FILE.exists()
&& !(RecoverySystem.BLOCK_MAP_FILE.exists());
pd.setTitle(context.getText(com.android.internal.R.string.reboot_to_update_title));
if (mRebootHasProgressBar) {
pd.setMax(100);
pd.setProgress(0);
pd.setIndeterminate(false);
pd.setProgressNumberFormat(null);
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMessage(context.getText(
com.android.internal.R.string.reboot_to_update_prepare));
} else {
if (showSysuiReboot()) {
return null;
}
pd.setIndeterminate(true);
pd.setMessage(context.getText(
com.android.internal.R.string.reboot_to_update_reboot));
}
} else if (mReason != null && mReason.equals(PowerManager.REBOOT_RECOVERY)) {
if (RescueParty.isAttemptingFactoryReset()) {
// We're not actually doing a factory reset yet; we're rebooting
// to ask the user if they'd like to reset, so give them a less
// scary dialog message.
pd.setTitle(context.getText(com.android.internal.R.string.power_off));
pd.setMessage(context.getText(com.android.internal.R.string.shutdown_progress));
pd.setIndeterminate(true);
} else {
// Factory reset path. Set the dialog message accordingly.
pd.setTitle(context.getText(com.android.internal.R.string.reboot_to_reset_title));
pd.setMessage(context.getText(
com.android.internal.R.string.reboot_to_reset_message));
pd.setIndeterminate(true);
}
} else {
// 判断是否显示SystemUIReboot 详见 8
if (showSysuiReboot()) {
return null;
}
// 显示关机 进度对话框 详见 8
pd.setTitle(context.getText(com.android.internal.R.string.power_off));
pd.setMessage(context.getText(com.android.internal.R.string.shutdown_progress));
pd.setIndeterminate(true);
}
pd.setCancelable(false);
pd.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
pd.show();
return pd;
}
关机 进度对话框实现
关机 进度对话框实现
8.判断是否显示SystemUIReboot
showSysuiReboot 主要用来显示是否显示SystemUIReboot.
private static boolean showSysuiReboot() {
Log.d(TAG, "Attempting to use SysUI shutdown UI");
try {
StatusBarManagerInternal service = LocalServices.getService(
StatusBarManagerInternal.class);
if (service.showShutdownUi(mReboot, mReason)) {
// Sysui will handle shutdown UI.
Log.d(TAG, "SysUI handling shutdown UI");
return true;
}
} catch (Exception e) {
// If anything went wrong, ignore it and use fallback ui
}
Log.d(TAG, "SysUI is unavailable");
return false;
}
9.启动 关机线程 ，执行 Run 方法
在beginShutdownSequence方法中启动 关机线程。
private static void beginShutdownSequence(Context context) {
... ...
// static instance of this thread
private static final ShutdownThread sInstance = new ShutdownThread();
// start the thread that initiates shutdown
sInstance.mHandler = new Handler() {
};
sInstance.start();
... ...
}
ShutdownThread Run 实现
ShutdownThread 主要作用：ActivityManager。PackageManager。Radios。System Server 的关闭。
/**
* Makes sure we handle the shutdown gracefully.
* Shuts off power regardless of radio state if the allotted time has passed.
*/
public void run() {
TimingsTraceLog shutdownTimingLog = newTimingsLog();
shutdownTimingLog.traceBegin("SystemServerShutdown");
metricShutdownStart();
metricStarted(METRIC_SYSTEM_SERVER);
BroadcastReceiver br = new BroadcastReceiver() {
@Override public void onReceive(Context context, Intent intent) {
// We don't allow apps to cancel this, so ignore the result.
actionDone();
}
};
/*
* Write a system property in case the system_server reboots before we
* get to the actual hardware restart. If that happens, we'll retry at
* the beginning of the SystemServer startup.
*/
{
String reason = (mReboot ? "1" : "0") + (mReason != null ? mReason : "");
SystemProperties.set(SHUTDOWN_ACTION_PROPERTY, reason);
}
/*
* If we are rebooting into safe mode, write a system property
* indicating so.
*/
if (mRebootSafeMode) {
SystemProperties.set(REBOOT_SAFEMODE_PROPERTY, "1");
}
metricStarted(METRIC_SEND_BROADCAST);
shutdownTimingLog.traceBegin("SendShutdownBroadcast");
Log.i(TAG, "Sending shutdown broadcast...");
// First send the high-level shut down broadcast.
mActionDone = false;
Intent intent = new Intent(Intent.ACTION_SHUTDOWN);
intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND | Intent.FLAG_RECEIVER_REGISTERED_ONLY);
// 发送 有序的 关机广播
mContext.sendOrderedBroadcastAsUser(intent,
UserHandle.ALL, null, br, mHandler, 0, null, null);
final long endTime = SystemClock.elapsedRealtime() + MAX_BROADCAST_TIME;
synchronized (mActionDoneSync) {
while (!mActionDone) {
long delay = endTime - SystemClock.elapsedRealtime();
if (delay <= 0) {
Log.w(TAG, "Shutdown broadcast timed out");
break;
} else if (mRebootHasProgressBar) {
int status = (int)((MAX_BROADCAST_TIME - delay) * 1.0 *
BROADCAST_STOP_PERCENT / MAX_BROADCAST_TIME);
sInstance.setRebootProgress(status, null);
}
try {
mActionDoneSync.wait(Math.min(delay, ACTION_DONE_POLL_WAIT_MS));
} catch (InterruptedException e) {
}
}
}
if (mRebootHasProgressBar) {
sInstance.setRebootProgress(BROADCAST_STOP_PERCENT, null);
}
// 测量 发送有序 关机广播所用的时间
shutdownTimingLog.traceEnd(); // SendShutdownBroadcast
metricEnded(METRIC_SEND_BROADCAST);
Log.i(TAG, "Shutting down activity manager...");
shutdownTimingLog.traceBegin("ShutdownActivityManager");
metricStarted(METRIC_AM);
// 关闭 Activity Manager
final IActivityManager am =
IActivityManager.Stub.asInterface(ServiceManager.checkService("activity"));
if (am != null) {
try {
am.shutdown(MAX_BROADCAST_TIME);
} catch (RemoteException e) {
}
}
if (mRebootHasProgressBar) {
sInstance.setRebootProgress(ACTIVITY_MANAGER_STOP_PERCENT, null);
}
shutdownTimingLog.traceEnd();// ShutdownActivityManager
metricEnded(METRIC_AM);
Log.i(TAG, "Shutting down package manager...");
shutdownTimingLog.traceBegin("ShutdownPackageManager");
metricStarted(METRIC_PM);
// 关闭 Package Manager
final PackageManagerService pm = (PackageManagerService)
ServiceManager.getService("package");
if (pm != null) {
pm.shutdown();
}
if (mRebootHasProgressBar) {
sInstance.setRebootProgress(PACKAGE_MANAGER_STOP_PERCENT, null);
}
shutdownTimingLog.traceEnd(); // ShutdownPackageManager
metricEnded(METRIC_PM);
// Shutdown radios.
shutdownTimingLog.traceBegin("ShutdownRadios");
metricStarted(METRIC_RADIOS);
//关闭 Radios shutdownRadios 详细 请看 10
shutdownRadios(MAX_RADIO_WAIT_TIME);
if (mRebootHasProgressBar) {
sInstance.setRebootProgress(RADIO_STOP_PERCENT, null);
}
shutdownTimingLog.traceEnd(); // ShutdownRadios
metricEnded(METRIC_RADIOS);
// 关闭 System Server
if (mRebootHasProgressBar) {
sInstance.setRebootProgress(MOUNT_SERVICE_STOP_PERCENT, null);
// If it's to reboot to install an update and uncrypt hasn't been
// done yet, trigger it now.
uncrypt();
}
shutdownTimingLog.traceEnd(); // SystemServerShutdown
metricEnded(METRIC_SYSTEM_SERVER);
saveMetrics(mReboot, mReason);
//初始化 并判断是关机还是重启 详见 11
rebootOrShutdown(mContext, mReboot, mReason);
}
10.shutdownRadios 关闭Radio 实现
shutdownRadios 用来关闭phone Radio相关内容 ，主要实现如下：
private void shutdownRadios(final int timeout) {
// If a radio is wedged, disabling it may hang so we do this work in another thread,
// just in case.
final long endTime = SystemClock.elapsedRealtime() + timeout;
final boolean[] done = new boolean[1];
//另起线程 异步关闭 Radios
Thread t = new Thread() {
public void run() {
TimingsTraceLog shutdownTimingsTraceLog = newTimingsLog();
boolean radioOff;
final ITelephony phone =
ITelephony.Stub.asInterface(ServiceManager.checkService("phone"));
try {
radioOff = phone == null || !phone.needMobileRadioShutdown();
if (!radioOff) {
Log.w(TAG, "Turning off cellular radios...");
metricStarted(METRIC_RADIO);
phone.shutdownMobileRadios();
}
} catch (RemoteException ex) {
Log.e(TAG, "RemoteException during radio shutdown", ex);
radioOff = true;
}
Log.i(TAG, "Waiting for Radio...");
long delay = endTime - SystemClock.elapsedRealtime();
while (delay > 0) {
if (mRebootHasProgressBar) {
int status = (int)((timeout - delay) * 1.0 *
(RADIO_STOP_PERCENT - PACKAGE_MANAGER_STOP_PERCENT) / timeout);
status += PACKAGE_MANAGER_STOP_PERCENT;
sInstance.setRebootProgress(status, null);
}
if (!radioOff) {
try {
radioOff = !phone.needMobileRadioShutdown();
} catch (RemoteException ex) {
Log.e(TAG, "RemoteException during radio shutdown", ex);
radioOff = true;
}
if (radioOff) {
Log.i(TAG, "Radio turned off.");
metricEnded(METRIC_RADIO);
shutdownTimingsTraceLog
.logDuration("ShutdownRadio", TRON_METRICS.get(METRIC_RADIO));
}
}
if (radioOff) {
Log.i(TAG, "Radio shutdown complete.");
done[0] = true;
break;
}
SystemClock.sleep(RADIOS_STATE_POLL_SLEEP_MS);
delay = endTime - SystemClock.elapsedRealtime();
}
}
};
//另起线程 异步关闭 Radios
t.start();
try {
t.join(timeout);
} catch (InterruptedException ex) {
}
if (!done[0]) {
Log.w(TAG, "Timed out waiting for Radio shutdown.");
}
}
11.rebootOrShutdown 初始化并决定关机还是重启
rebootOrShutdown主要用来 初始化并决定关机还是重启。
/**
* Do not call this directly. Use {@link #reboot(Context, String, boolean)}
* or {@link #shutdown(Context, String, boolean)} instead.
*
* @param context Context used to vibrate or null without vibration
* @param reboot true to reboot or false to shutdown
* @param reason reason for reboot/shutdown
*/
public static void rebootOrShutdown(final Context context, boolean reboot, String reason) {
String subsysProp;
subsysProp = SystemProperties.get("vendor.peripheral.shutdown_critical_list",
"ERROR");
//If we don't have the shutdown critical subsystem list we can't
//really do anything. Proceed with full system shutdown.
if (!subsysProp.equals("ERROR")) {
Log.i(TAG, "Shutdown critical subsyslist is :"+subsysProp+": ");
Log.i(TAG, "Waiting for a maximum of " +
(VENDOR_SUBSYS_MAX_WAIT_MS) + "ms");
String[] subsysList = subsysProp.split(" ");
int wait_count = 0;
boolean okToShutdown = true;
String subsysState;
int subsysListLength = subsysList.length;
do {
okToShutdown = true;
for (int i = 0; i < subsysListLength; i++) {
subsysState =
SystemProperties.get(
"vendor.peripheral." +
subsysList[i] +
".state",
"ERROR");
if(subsysState.equals("ONLINE")) {
//We only want to delay shutdown while
//one of the shutdown critical
//subsystems still shows as 'ONLINE'.
okToShutdown = false;
}
}
if (okToShutdown == false) {
SystemClock.sleep(VENDOR_SUBSYS_STATE_CHECK_INTERVAL_MS);
wait_count++;
}
} while (okToShutdown != true &&
wait_count < (VENDOR_SUBSYS_MAX_WAIT_MS/VENDOR_SUBSYS_STATE_CHECK_INTERVAL_MS));
if (okToShutdown != true) {
for (int i = 0; i < subsysList.length; i++) {
subsysState =
SystemProperties.get(
"vendor.peripheral." +
subsysList[i] +
".state",
"ERROR");
if(subsysState.equals("ONLINE")) {
Log.w(TAG, "Subsystem " + subsysList[i]+
"did not shut down within timeout");
}
}
} else {
Log.i(TAG, "Vendor subsystem(s) shutdown successful");
}
}
if (reboot) {
Log.i(TAG, "Rebooting, reason: " + reason);
PowerManagerService.lowLevelReboot(reason);
Log.e(TAG, "Reboot failed, will attempt shutdown instead");
reason = null;
} else if (SHUTDOWN_VIBRATE_MS > 0 && context != null) {
// vibrate before shutting down
Vibrator vibrator = new SystemVibrator(context);
try {
vibrator.vibrate(SHUTDOWN_VIBRATE_MS, VIBRATION_ATTRIBUTES);
} catch (Exception e) {
// Failure to vibrate shouldn't interrupt shutdown. Just log it.
Log.w(TAG, "Failed to vibrate during shutdown.", e);
}
// vibrator is asynchronous so we need to wait to avoid shutting down too soon.
try {
Thread.sleep(SHUTDOWN_VIBRATE_MS);
} catch (InterruptedException unused) {
}
}
// Shutdown power
Log.i(TAG, "Performing low-level shutdown...");
PowerManagerService.lowLevelShutdown(reason);
}
12. 关机log 分析
通过 链接adb,我们可以抓取关机的Log， 部分Log信息如下:
Line 96: 07-26 01:02:26.205 2510 3766 I AudioController: internalShutdown
Line 540: 07-26 01:02:30.968 790 790 D ShutdownThread: Notifying thread to start shutdown longPressBehavior=1
Line 540: 07-26 01:02:30.968 790 790 D ShutdownThread: Notifying thread to start shutdown longPressBehavior=1
Line 541: 07-26 01:02:30.970 790 790 D ShutdownThread: Attempting to use SysUI shutdown UI
Line 541: 07-26 01:02:30.970 790 790 D ShutdownThread: Attempting to use SysUI shutdown UI
Line 542: 07-26 01:02:30.971 790 790 D ShutdownThread: SysUI handling shutdown UI
Line 542: 07-26 01:02:30.971 790 790 D ShutdownThread: SysUI handling shutdown UI
Line 555: 07-26 01:02:30.997 790 3902 I ShutdownThread: Sending shutdown broadcast...
Line 555: 07-26 01:02:30.997 790 3902 I ShutdownThread: Sending shutdown broadcast...
Line 561: 07-26 01:02:31.014 790 790 W SyncManager: Writing sync state before shutdown...
Line 666: 07-26 01:02:31.436 2510 3766 I AudioController: internalShutdown
Line 669: 07-26 01:02:31.443 790 790 I StatsCompanionService: StatsCompanionService noticed a shutdown.
Line 708: 07-26 01:02:31.671 790 3902 D ShutdownTiming: SendShutdownBroadcast took to complete: 675ms
Line 708: 07-26 01:02:31.671 790 3902 D ShutdownTiming: SendShutdownBroadcast took to complete: 675ms
Line 711: 07-26 01:02:31.671 790 3902 I ShutdownThread: Shutting down activity manager...
Line 740: 07-26 01:02:31.954 790 3902 W AppOps : Writing app ops before shutdown...
Line 771: 07-26 01:02:32.152 790 3902 W BatteryStats: Writing battery stats before shutdown...
Line 806: 07-26 01:02:32.386 790 1015 W system_server: Long monitor contention with owner Thread-29 (3902) at void com.android.server.am.BatteryStatsService.shutdown()(BatteryStatsService.java:249) waiters=0 in void com.android.server.am.BatteryStatsService.noteProcessStart(java.lang.String, int) for 132ms
Line 840: 07-26 01:02:32.507 790 3902 W ProcessStatsService: Writing process stats before shutdown...
Line 850: 07-26 01:02:32.563 790 3902 D ShutdownTiming: ShutdownActivityManager took to complete: 891ms
Line 850: 07-26 01:02:32.563 790 3902 D ShutdownTiming: ShutdownActivityManager took to complete: 891ms
Line 853: 07-26 01:02:32.563 790 3902 I ShutdownThread: Shutting down package manager...
Line 872: 07-26 01:02:32.656 790 3902 D ShutdownTiming: ShutdownPackageManager took to complete: 93ms
Line 872: 07-26 01:02:32.656 790 3902 D ShutdownTiming: ShutdownPackageManager took to complete: 93ms
Line 879: 07-26 01:02:32.677 1804 1976 V PhoneInterfaceManager: [PhoneIntfMgr] 1 Phones are shutdown.
Line 882: 07-26 01:02:32.678 790 3951 I ShutdownThread: Waiting for Radio...
Line 883: 07-26 01:02:32.679 790 3951 I ShutdownThread: Radio shutdown complete.
Line 883: 07-26 01:02:32.679 790 3951 I ShutdownThread: Radio shutdown complete.
Line 884: 07-26 01:02:32.681 790 3902 D ShutdownTiming: ShutdownRadios took to complete: 25ms
Line 884: 07-26 01:02:32.681 790 3902 D ShutdownTiming: ShutdownRadios took to complete: 25ms
Line 885: 07-26 01:02:32.681 790 3902 D ShutdownTiming: SystemServerShutdown took to complete: 1705ms
Line 885: 07-26 01:02:32.681 790 3902 D ShutdownTiming: SystemServerShutdown took to complete: 1705ms
Line 886: 07-26 01:02:32.684 790 3902 I ShutdownThread: Shutdown critical subsyslist is :modem :
Line 886: 07-26 01:02:32.684 790 3902 I ShutdownThread: Shutdown critical subsyslist is :modem :
Line 887: 07-26 01:02:32.684 790 3902 I ShutdownThread: Waiting for a maximum of 10000ms
Line 888: 07-26 01:02:32.684 790 3902 I ShutdownThread: Vendor subsystem(s) shutdown successful
Line 888: 07-26 01:02:32.684 790 3902 I ShutdownThread: Vendor subsystem(s) shutdown successful
Line 931: 07-26 01:02:33.192 790 3902 I ShutdownThread: Performing low-level shutdown...
Line 931: 07-26 01:02:33.192 790 3902 I ShutdownThread: Performing low-level shutdown...
Line 1003: 07-26 01:02:33.543 565 585 E Dpps : ProcessAlMsg():471 Shutdown event recieved quit -108
Line 1005: 07-26 01:02:33.543 565 585 I Dpps : ProcessNextEvent():142 Shutdown notification quit processing
Line 1009: 07-26 01:02:33.562 565 583 E Dpps : ProcessAbaMsg():579 Shutdown event recieved quit -108
至此，本篇已结束，如有不对的地方，欢迎您的建议与指正。同时期待您的关注，感谢您的阅读，谢谢！
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