locking

问题 i want to lock the phone when i click the lock button.anybody please help with simple code.i tried with part of code from API_Demos but it shows some error. 回答1: You can lock the Android's screen programmatically using the LockScreen class like so: KeyguardManager mgr = (KeyguardManager)getSystemService(Activity.KEYGUARD_SERVICE); KeyguardLock lock = mgr.newKeyguardLock(KEYGUARD_SERVICE); lock.reenableKeyguard(); Take a look at the LockScreen class here. 回答2: The code: KeyguardManager mgr =

问题 I have a question about how flock() works, particularly in python. I have a module that opens a serial connection (via os.open() ). I need to make this thread safe. It's easy enough making it thread safe when working in the same module using threading.Lock() , but if the module gets imported from different places, it breaks. I was thinking of using flock() , but I'm having trouble finding enough information about how exactly flock works. I read that flock() unlocks the file once the file is

问题 SELECT id FROM table_name tkn1, (SELECT id, ROWNUM rnum FROM table_name WHERE PROCS_DT is null order by PRTY desc, CRET_DT) result WHERE tkn1.id= result.id AND result.rnum <= 10 FOR UPDATE OF tkn1.id SKIP LOCKED Here is my problem. 2 threads are accessing this query at the same time Thread 1 - Executes select and locks 10 rows ordered by descending priority and created date. Next I would update the procs_dt as todays date from a separate query.. Thread 2 - Before update of procs_dt or commit

问题 Currently we are analyzing a tomcat thread dump. A single thread dump of all threads running at that same time on a tomcat contains the following lines: ... "soldOutJmsConsumerContainer-1" prio=10 tid=0x00007f8409c14800 nid=0x231 in Object.wait() [0x00007f8403a9f000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:485) at com.tc.object.RemoteObjectManagerImpl.waitUntilRunning(RemoteObjectManagerImpl.java:150) at

问题 Consider two entities Parent and Child. Child is part of Parent's transient collection Child has a ManyToOne mapping to parent with FetchType.LAZY Both are displayed on the same form to a user. When user saves the data we first update Parent instance and then Child collection (both using merge). Now comes the tricky part. When user modifies only Child property on the form then hibernate dirty checking does not update Parent instance and thus does not increase optimistic locking version number

问题 When one must synchronize programs (shell scripts) via file system, I have found an flock -based solution to be recommended (should also work on NFS). The canonical example for usage from within a script (from http://linux.die.net/man/1/flock) is: ( flock -s 200 # ... commands executed under lock ... ) 200>/var/lock/mylockfile I don't quite get why this whole construct ensures atomicity. In particular, I am wondering in which order flock -s 200 and 200>/var/lock/mylockfile are executed when e

问题 i need to check if the lockscreen does have a Pin or something more secure (Password, Fingerprint etc.). Im able to check if there is a Pin, Password or a Pattern. KeyguardManager keyguardManager = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE); return keyguardManager.isKeyguardSecure(); My Problem is that i cant detect if the lockscreen is a Pattern or something lower. I tried this: int lockPatternEnable = Settings.Secure.getInt(cr, Settings.Secure.LOCK_PATTERN_ENABLED)

问题 This question already has answers here : How do determine if an object is locked (synchronized) so not to block in Java? (7 answers) Closed 2 years ago . If I want to ensure exclusive access to an object in Java, I can write something like this: ... Zoo zoo = findZoo(); synchronized(zoo) { zoo.feedAllTheAnimals(); ... } Is there a way to check if an object is currently locked? I don't want my thread to wait if another thread is accessing zoo . If zoo is not locked, I want my thread to acquire

问题 Since LOCK_PATTERN_ENABLED was moved to Settings.Secure in Froyo my app can no longer lock the screen... Does anyone know a workaround for this? Any way that my app can instantly lock the screen? No matter if its the autolock pattern or some kind of custom lock screen... 回答1: This is a little cumbersome... If you add a DeviceAdminReceiver to your app and the user enables it the security settings then you are allowd to call DevicePolicyManager dpm = (DevicePolicyManager) getSystemService

问题 When streaming a video from an iPhone (or any iOS device) to a TV via Airplay, the stream stops as soon as the device goes to sleep from inactivity. At the moment, I disabled the sleep timer so that the device does not automatically sleep, but is there a better solution to this? Is setting AVPlayer.externalPlaybackActive enough to allow the OS to know to keep playing when the screen is off? If not, is there an alternate way to keep Airplay running even if the device turns off its screen? 回答1: