On the other hand if the OS decides to it needs more memory it can destroy your activty and will be open for garbage collection and also will go through the onDestroy() lifecycle. Now this state can persist until you return to your app, then it will go through onStart and onResume, since all your references/fields you created onCreate still exists and can be "reused". In your case if you send your activity in background, if android has RAM available it trys to keep your activity in RAM, so it's going through onPause and onStop. The activity lifecycle represents the actual behaviour only very roughly, mostly I got my understanding through experience and trail and error. You can assume that Android OS can interfere with your Activities lifecycle how it may seem fit when it's in background. It also discusses its lifecycle and how Android prioritizes its memory usage.Īndroid's activity lifecycle is extremly complicated and even Romain Guy states he doesn't understand it fully after many years of core development on android. If you haven't read it yet, the Service reference has some pretty good info. Using wakelocks prevents the phone from going into sleep mode, which is why services will still run while the phone's screen is off for an extended period of time. When the phone goes into sleep mode it powers down the CPU, essentially "freezing" all processes, and as a result all services also. When the screen goes off but it doesn't go into sleep mode yet, the cpu is still working and the service is still running. When you turn the screen off, it may or may not go into sleep mode right away. I think it's important to point out that sleep mode and turning off the screen are not the same thing. Your activity still exists in memory, which means that your button listener is also still registered. That is why your button click listener still works when you turn the screen off. Only when the system really needs the resources that your activity holds will it call your activity's onDestroy(). ![]() That means that your activity still exists in memory when the screen goes off (at least at the beginning). At least to my understanding, Android's OS attempts to keep as much of its memory used as possible so that apps will load back up faster, etc (this is a real over simplification, but I believe that is the general idea). However, just because it reaches onStop() does not mean that it will always reach onDestroy(). When the phone's screen is turned off, the activity's onPause() callback is called, followed by onStop(). Simple answer: your activity is not being destroyed when the screen goes off, so there is no reason for onCreate() to be called again. Plus, the charge is much slower.What do you mean by, why doesn't the onCreate() get called again? In fact, it overheats your battery (which we know can drain your battery’s life). While this method may seem cool, it’s anything but. Or at least that’s how it seems when you’re using wireless charging techniques. The future is upon us - we’re able to generate energy seemingly out of thin air. Should You Trust Wireless & Quick Charging Methods? Have it charged somewhere between 40% and 80% and store it somewhere around room temperature. In the event you decide to remove your battery, be sure to store it properly. ![]() Some laptops will reduce power consumption when you have AC power without a battery. ![]() Just be sure to consider the power management of the device in question. So it depends on the device you’re using. Asus claims you should allow your battery to drain to at least 50% twice per month. Dell says you can keep your laptop plugged in at all times with the battery in. Brands like Acer say you don’t need to remove your battery while it’s on AC power - yet, you should take it out if you don’t plan to use the device for a few days.Īpple, on the other hand, tells its customers they should never take their batteries out. For instance, some laptops, smartphones, and tablets have sealed batteries.
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