wakelock

Transferred from: http://blog.csdn.net/jacobywu/article/details/24735521Directory (?) [-] Question Answer Add Boot Parameters No_console_suspend Initcall_debug Suspend_test Wakelock Power0 Earlysuspend Suspendresume hours fine Tune Question:How to get enough information under Linux or Android to do the fine tune of power management?Answer:Under Linux or Android, when it comes to power mana

the message to fail after hibernation. Some people may say that the phone has a wake-up mechanism, if it has been awakened, so that the software is a big power consumption, basically do not have a day of cell phone battery is dry light, think about half a grid before bedtime, the morning the electricity dry light is shut down, depressed mood immediately spontaneously, so this is not possible, will directly lead to the software is Instant and power consumption is contradictory, how to do? The

myservice extends Service {private sensormanager mmanager; private sensor msensor = NULL; private sensoreventlistener mlistener = NULL; private powermanager localpowermanager = NULL; private powermanager. wakelock localwakelock = NULL; @ overridepublic void oncreate () {// gets the system service power_service, and returns a powermanager object localpowermanager = (powermanager) getsystemservice (context. power_service); // obtain powerm Anager.

(g_fds [release_wake_lock], ID, strlen (ID )); Return Len> = 0; } Intset_screen_state (INT on) { Qemu_fallback (set_screen_state (on )); Logi ("*** set_screen_state % d", on ); Initialize_fds (); If (g_error) return g_error; Char Buf [32]; Int Len; If (on) Len = sprintf (BUF, on_state ); Else Len = sprintf (BUF, off_state ); Len = write (g_fds [request_state], Buf, Len ); If (LEN LogE ("failed setting last user activity: g_error = % d/N", g_error ); } Return 0; } The Hal-layer code is used

the same content and timestamp to the file again after 5s. Why do you want 5s? Because I want to verify that the socket read to the package, is not running a moment immediately after sleep, if yes, then 5s, the 2nd time is not written to the file on time, because the system is dormant, the program will not be executed, handler inside the message can not be executed. The important place is the sentence acquirewakelock and Releasewakelock, if Wake, then the 2nd write must be completed within 5s.

Android PowerManager BatteryManager, powermanager PowerManager is used in the Android platform to manage and control the power status, restart, sleep status, and wake up of the device. Using this API will affect the battery standby time, so it is only necessary and generally not used. There are several important common methods in PowerManager: The following permissions are required for methods such as goToSleep, reboot, and userActivity: These two permissions can only be used by the system Ap

public class OfflineAlarmReceiver extends BroadcastReceiver {2 @ Override 3 public void onReceive (Context context, Intent arg1) {4 5 // omitting the code ..., initialize the variable and prepare the variable... 6 7 if (System. currentTimeMillis ()-OfflineService. lastDownloadTime> 3600000*60 other conditions) {8 // enable the offline download service 9 Intent alarmIntent = new Intent (context, OfflineService. class); 10 context. startService (alarmIntent); 11} 12} 13 14} We mentioned the thre

suspend state. Echo disk>/sys/power/State: the command system enters the hibernation status. Echo lockname>/sys/power/wake_lock: Lock "lockname"Echo lockname>/sys/power/wake_unlock: Unlock "lockname"The above are the commands for respectively locking and unlocking. Once all the wakelock in the system is unlocked, the system will enter the suspend state, it can be seen that in Linux, the previous suspend operation (echo mem>/sys/power/State, etc.) in

. getbroadcast (context. getapplicationcontext (), 0, intent, 0); alarmmanager. cancel (pendingintent); alarmmanager. setrepeating (alarmmanager. rtc_wakeup, system. currenttimemillis (), 3600000*6, pendingintent );}} In offlinealarmrecriver, process the start download condition and notify the start download: Public class offlinealarmreceiver extends broadcastreceiver {@ override public void onreceive (context, intent arg1) {// omitting the code ..., initialize the variable and prepare the va

= wake_bit_cpu_strong; public static final int full_wake_lock = wake_bit _ Cpu_weak | percent; public static final int screen_bright_wake_lock = wake_bit_cpu_weak | wake_bit_screen_bright; public static final int screen_dim_wake_lock = wake_bit_cpu_weak | percent; /*** wake lock that turns the screen off when the proximity sensor activates. * Since not all devices have proximity sensors, use * {@ link # getsupportedwa Kelockflags () getsupportedwakelockflags ()} to determine if * this wake lock

Keep the screen on when running the program. Powermanager. wakelock must be released and enabled in pairs. The impact of various lock types on the CPU, screen, and keyboard: Partial_wake_lock: to keep the CPU running, the screen and keyboard lights can be turned off. Screen_dim_wake_lock: to keep the CPU running and display on the screen, but it can be dimmed to allow the keyboard light to turn off. Screen_bright_wake_lock: allows you to keep the CPU

When the Android system is not operating for a long time, the system chooses to hibernate in order to conserve resources. The timer, Handler, Thread, service, and so on, which are customized during hibernation, will be paused. And sometimes this mechanism can affect the normal operation of our program. So how to avoid the effect of system hibernation on our program?The following service services are examples of how to wake up the system and perform our custom service services in a system hiberna

To prolong the battery life, the Android device dims the screen after some time, then turns off the screen display and finally stops the CPU. Wakelock is a power management system service feature that applications can use to control the power state of a device.The Wakelock can be used to keep the CPU running, avoid darkening and turning off the screen, and avoid the keyboard backlight off.Note: creating and

1. The problem now encountered, the phone into hibernation after the wake, the app software and CC2541 communication is not normal, but CC2541 still detect when the connection state. How to solve this problem? Will the activity be recreated after the phone wakes up?2.Wakelock lock Mechanism:Applications can vote on whether the system is standby by applying the Wakelock lock mechanism, and when any applicati

as we hold this lock,Then the system cannot enter the sleep state, which can be obtained by the user State program or kernel! The lock can be :"Timeout"Or"No timeout", The timeout lock will be automatically unlocked after the time ends. If there is no lock or timeout, the kernel will start the sleep mechanism to enter the sleep! 2. Introduction to the wakelock lock PowerManager. WakeLockYesLockAndUnlockTwo statuses, and two locks:①Permanent LockT

; input input; FileIO FileIO; Screen screen; WakeLock WakeLock; @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Requestwindowfeature (Window.feature_no_title); GetWindow (). SetFlags (WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN ); Boolean islandscape = Getresources (). GetConfiguration

many optimizations for embedded devices. The source code is located in kernel/power/earlysuspend. C. Kernel/power/consoleearlysuspend. c Kernel/power/fbearlysuspend. c Kernel/power/wakelock. c Kernel/power/userwakelock. c The low Memory Manager (low memory killer) is more flexible than the Linux Standard OOM (out of memory) mechanism. It can kill processes as needed to release the required memory. The source code is in drivers/staging/Android/lowmemo

PerformancePower is actually one of the most valuable resources in handheld devices, and most devices need to be recharged continuously to maintain their use. Unfortunately, for developers, power optimization is the last thing they'll think about. But you can be sure that you can't make your application a big drain on your battery.Purdue University studied the power consumption of some of the most popular applications, with an average of about 30% of the power being used by the program's core m

program's core methods, such as drawing pictures, placing layouts, and so on, and the remaining 70% or so of the charge is reported data, check location information, Time to retrieve background advertising information used. How to balance the power consumption of both is very important.There are several measures that can significantly reduce the consumption of electricity: We should try to reduce the number of wake-up screens and duration, use Wake