wakelock

update to achieve the purpose of power savingGraphicsIn the eighth chapter of the book on performance optimization for Android applications, there is a special introductionRemind AlarmmanagerElapsed_timeElapsed_time_wakeupRtcRtc_wakeupexpressed using Elapsed_time and RTC. Assume that the device does not wake up and then wait for the device to wake up to run the corresponding actionSo try to use both of these parametersIn addition, the use of Alarmmanager setinexactrepeating is also able to achi

then the CPU goes to sleep, all this is to save valuable power resources. But even in this state of sleep, most applications will still try to work, and they will constantly wake up the phone. One of the simplest ways to wake up a phone is to use the Powermanager.wakelock API to keep the CPU working and prevent the screen from darkening off. This allows the phone to be awakened, perform work, and then go back to sleep. Knowing how to get Wakelock is

specifically to store this class.B, Static is used to modify the internal members of the class. such as static methods, static member variables. Its only function is to be generated as the class is loaded (not as the object is produced), so that it can be obtained directly with the class name + static member name. This allows the static inner class to be understood, and it can be obtained directly from the external class name + internal class name. Examples are as follows:public class Build {..

situation of the timer in the system, irregular generation, which can reduce a lot of useless timer interrupt CPU idle, the framework for controlling the idle state of the CPU Generic PM, Power Management in the traditional sense, such as power Off, Suspend to RAM, Suspend to Disk, hibernate, etc. Runtime PM and Wakelock, runtime Power Management, no longer require user program interference, unified scheduling by kernel, real-time shutdown or o

); // M:Synchronized (KeyguardViewMediator. this ){If (DBG_WAKE) KeyguardUtils. xlogD (TAG, "handleWakeWhenReady (" + keyCode + ") wakeMSGId =" + wakeMSGId );// This shoshould result in a call to 'poke wakelock 'which will set a timeout// On releasing the wakelockIf (! MKeyguardViewManager. wakeWhenReadyTq (keyCode )){// Poke wakelock ourselves if keyguard is no longer activeKeyguardUtils. xlogD (TAG, "mKey

eighth chapter of the book on performance optimization for Android applications, there is a special introductionRemind AlarmmanagerElapsed_timeElapsed_time_wakeupRtcRtc_wakeupUse Elapsed_time and RTC to indicate that when the device is not woken up when it is finished, it waits for the device to be awakened before performing the corresponding actionSo try to use these two parametersIn addition, the use of Alarmmanager setinexactrepeating can also achieve power saving purposes, the main differen

Wake Lock is a mechanism of locking, as long as someone holding this lock, the system will not go into hibernation,can be obtained by the user-state program and the kernel. This lock can be timed out or not timed out,A timeout lock is automatically unlocked after the time has elapsed. If there is no lock or timeout, the kernelIt starts the sleep mechanism to go into hibernation.(i). The kernel maintains:1). Two linked list, Active_wake_locks[wake_lock_type_count]Active_wake_locks[0] Suspend lock

Android sleep (suspend)Involved files: Kernel/power/main. c Kernel/power/earlysuspend. c Kernel/power/wakelock. c There are three main steps for suspend: 1. Freeze user-State processes and kernel-state tasks 2. Call the suspend callback function of the registered device in the order of registration. 3. Sleep the core device and sleep the CPU into a sleep frozen process. The kernel sets the state of all processes in the process list to stop and saves

Wake lock is a lock mechanism. As long as someone holds this lock, the system will not be able to sleep and can be obtained by user State programs and kernels. the lock can be time-out or not time-out. The lock will be automatically unlocked after the time expires. if there is no lock or timeout, the kernel will start the sleep mechanism to enter sleep. (1 ). kernel maintenance: 1 ). two linked lists, active_wake_locks [wake_lock_type_count] active_wake_locks [0], maintain suspend lock. active_w

1),Powermanager. Java This file definesPowermanagerClass is used by other files.Nest class: Public class wakelock,Nest classThere are the following methods: Public void setreferencecounted (Boolean value)Public void acquire ()Public void acquire (long timeout)Public void release ()Public void release (INT flags)Public Boolean isheld ()Public String tostring ()@ OverrideProtected void finalize () throws throwable TheNest classThe constr

Use it with caution, otherwise it will consume a lot of power.Official examplePowermanager PM = (powermanager) getsystemservice (context. power_service); powermanager. wakelock WL = PM. newwakelock (powermanager. screen_dim_wake_lock, "my tag"); WL. acquire ();.. screen will stay on during this section .. WL. release ();CPU lockPartial_wake_lock: The CPU is still running when you press the power key.Powermanager PM = (powermanager) context. getsystems

/1244.5.2 activity information management/1254.5.3 search and analysis of intent matching/1284.5.4 queryintentactivities Summary/1314.6 introduction to installd and usermanager/1314.6.1 installd introduction/1314.6.2 usermanager introduction/1364.7 guide to this chapter/1384.8 Summary of this chapter/138Chapter 2 in-depth understanding of powermanagerservice/5th5.1 Overview/1405.2 First recognized powermanagerservice/1405.2.1 PMS constructor analysis/1415.2.2 init analytics/1415.2.3 systemready

See a post, make notes, post in: http://topic.csdn.net/u/20110304/15/ae5279b1-692e-48a7-a5b9-0e579a3a6974.html What I want to record is: A service that provides the reminder function to automatically unlock and enable the screen. Write an activity to start the service. Use a thread to start the service. It will only be effective if the service is started on a black screen. Import Android. App. keyguardmanager;Import Android. App. keyguardmanager. keyguardlock;Import Android. App. Service;Import

Method One: Copy Code code as follows: Copy Code code as follows: Private PowerManager PowerManager = null; Private Wakelock wakelock = null; PowerManager = (PowerManager) this.getsystemservice (Service.power_service); Wakelock = This.powerManager.newWakeLock (Powermanager.screen_dim_wake_lock, "my LOCK"); Whether t

This article describes the Android programming to prohibit the system lock screen and Jianjiang screen method. Share to everyone for your reference, specific as follows: Demand: At some point, the task finishes, closes the screen, opens the screen at some point, continues to perform the task Usually, do not set the screen often bright, the system will automatically lock the screen, lock screen can not unlock from the code (doubt), so my practice is only to let the system close the screen, but

See a post, do note, post in: http://topic.csdn.net/u/20110304/15/ae5279b1-692e-48a7-a5b9-0e579a3a6974.html What I want to record is: Do a reminder function of a service, automatic unlock + light screen. Write an activity start the service, use a thread to open the service, if the black screen to start the effect of the state. Import Android.app.KeyguardManager; Import Android.app.KeyguardManager.KeyguardLock; Import Android.app.Service; Import Android.content.Context; Import androi

is because the class also occupies space, one application class is too many, the space will become larger, that is, the application will consume more memory.Handlerthread Introduction=synchronized (this ==-1Handlerthread inherits from thread, which creates a looper for itself within the run method, is different from the normal thread on Handlerthread, and cannot perform common background operations and can only be used to process new messages. This is because Looper.loop () is a dead loop and y

available in SDK 1.0, but it can be retrieved by calling Intent.getdatastring (); 8, obtain IP address A.//connect VI A WIFI via Wifiwifimanager Wifimanager = (wifimanager) getsystemservice (Wifi_service); Wifiinfo wifiinfo = Wifimanager.getconnectioninfo (); int ipAddress = Wifiinfo.getipaddress (); B.//connect via GPRS via Gprspublic String getlocalipaddress () {try{for (enumerationPowerManager pm = (powermanager) this.getsystemservice (Context.power_service);

IntentService Constructor /** * Creates an IntentService. Invoked by your subclass's constructor. * * @param name Used to name the worker thread, important only for debugging. */ public IntentService(String name) { super(); mName = name; } Analysis: This constructor must be called in the subclass to create an IntentService object. The parameter name is used to define the name of the worker thread and is only used for tuning. We know that the Service life cy

First, opportunistic sleep introduction1. Background(1) Android-facing problemsOpportunistic sleep: When there is no task, you need to find the opportunity to enter the suspended(2) 3 types of synchronization issuesA. Kernel: Driver during event processing, the system cannot suspendB. User: The system cannot be suspend during user process processingC. The kernel interacts with the user:During the sleep process, the event is triggered and the abort suspend process is required;Event events need to