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閱讀五分鍾，每日十點，和您一起終身學習，這里是程序員Android
本篇文章主要介紹 Android 開發中的部分知識點，通過閱讀本篇文章，您將收獲以下內容:
1.ShutdownThread 概述
2.shutdown 關機方法
3.shutdownInner 方法實現
4.CloseDialogReceiver 注冊關機對話框廣播
5.new sConfirmDialog 顯示關機對話框
6.beginShutdownSequence開始關機流程
7.showShutdownDialog 顯示關機進度對話框
8.判斷是否顯示SystemUIReboot
9.啟動 關機線程 ，執行 Run 方法
10.shutdownRadios 關閉Radio 實現
11.rebootOrShutdown 初始化並決定關機還是重啟
12.關機log 分析
1.ShutdownThread 概述
關機線程實現類
Android 關機線程實現類frameworks/base/services/core/java/com/android/server/power/ShutdownThread.java
ShutdownThread 大致流程
ShutdownThread 部分靜態變量如下：
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 無參構造方法
private ShutdownThread() {
}
2. shutdown 關機方法
長按 ·Power· 鍵調用 shutdown 方法，通過調用內部shutdownInner方法，實現 彈出 關機 、重啟對話框，供用戶選擇關機 或者重啟。
/**
* 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); // 詳見分析3
}
3.shutdownInner 方法實現
shutdownInner 主要作用是
1.獲取用戶關機 Behavior。
2.注冊關機廣播，詳見4.
3.創建關機Dialog。
4.執行一系列關機流程。
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;
}
}
// 獲取用戶長按Power鍵的處理行為
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) {
//注冊關機對話框廣播 詳細實現見 4
final CloseDialogReceiver closer = new CloseDialogReceiver(context);
if (sConfirmDialog != null) {
sConfirmDialog.dismiss();
}
// 創建關機Dialg 詳見 實現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) {
// 開始一系列的關機流程，詳見 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 用來控制用戶長按Power鍵觸發的行為。
主要行為如下：
<!-- Control the behavior when the user long presses the power button.
0 - Nothing
1 - Global actions menu
2 - Power off (with confirmation)
3 - Power off (without confirmation)
4 - Go to voice assist
-->
<integer name="config_longPressOnPowerBehavior">1</integer>
此源碼 可以在 config.xml中查看，代碼目錄如下：frameworks\base\core\res\res\values\config.xml
4.CloseDialogReceiver 注冊關機對話框廣播
注冊action 為ACTION_CLOSE_SYSTEM_DIALOGS廣播接收器。
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 顯示關機對話框
Android 原生關機對話框如下：
// 創建關機Dialg 詳見 實現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) {
// 開始一系列的關機流程，詳見 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開始關機流程
beginShutdownSequence 開始一系列關機流程，主要功能如下：
1.顯示關機進度條對話框。
2.啟動ShutdownThead 線程。
private static void beginShutdownSequence(Context context) {
synchronized (sIsStartedGuard) {
if (sIsStarted) {
Log.d(TAG, "Shutdown sequence already running, returning.");
return;
}
sIsStarted = true;
}
// 顯示關機進度對話框 詳見 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);
}
// 啟動 關機線程 ，執行 Run 方法，詳見 9
sInstance.mHandler = new Handler() {
};
sInstance.start();
}
7.showShutdownDialog 顯示關機進度對話框
showShutdownDialog 主要用來顯示關機進度對話框
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 {
// 判斷是否顯示SystemUIReboot 詳見 8
if (showSysuiReboot()) {
return null;
}
// 顯示關機 進度對話框 詳見 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;
}
關機 進度對話框實現
8.判斷是否顯示SystemUIReboot
showSysuiReboot 主要用來顯示是否顯示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.啟動 關機線程 ，執行 Run 方法
在beginShutdownSequence方法中啟動 關機線程。
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 實現
ShutdownThread 主要作用：
1.發送有序的關機廣播。
2.測量關閉某些項目的時間。
3.關閉 ActivityManager。
4.關閉PackageManager。
5.關閉 Radios。
6.完成System Server 的關閉。
7.初始化並判定執行關機還是重啟
/**
* 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);
// 發送 有序的 關機廣播
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);
}
// 測量 發送有序 關機廣播所用的時間
shutdownTimingLog.traceEnd(); // SendShutdownBroadcast
metricEnded(METRIC_SEND_BROADCAST);
Log.i(TAG, "Shutting down activity manager...");
shutdownTimingLog.traceBegin("ShutdownActivityManager");
metricStarted(METRIC_AM);
// 關閉 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);
// 關閉 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);
//關閉 Radios shutdownRadios 詳細 請看 10
shutdownRadios(MAX_RADIO_WAIT_TIME);
if (mRebootHasProgressBar) {
sInstance.setRebootProgress(RADIO_STOP_PERCENT, null);
}
shutdownTimingLog.traceEnd(); // ShutdownRadios
metricEnded(METRIC_RADIOS);
// 關閉 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 並判斷是關機還是重啟 詳見 11
rebootOrShutdown(mContext, mReboot, mReason);
}
10.shutdownRadios 關閉Radio 實現
shutdownRadios 用來關閉phone Radio相關內容 ，主要實現如下：
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];
//另起線程 異步關閉 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();
}
}
};
//另起線程 異步關閉 Radios
t.start();
try {
t.join(timeout);
} catch (InterruptedException ex) {
}
if (!done[0]) {
Log.w(TAG, "Timed out waiting for Radio shutdown.");
}
}
11.rebootOrShutdown 初始化並決定關機還是重啟
rebootOrShutdown主要用來 初始化並決定關機還是重啟。
/**
* 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. 關機log 分析
通過 鏈接adb,我們可以抓取關機的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，本篇已結束，如有不對的地方，歡迎您的建議與指正。同時期待您的關注，感謝您的閱讀，謝謝！
