Android new thread memory leak

Option 2: If you really have to use activity context, then when the activity is destroyed, ensure that the context you passed to the singleton class is set to null. As mentioned before never create a static variable of an inner class.

Main thread

The class should be set to static. Option 3: Garbage collector can collect an object if only weak references are pointing towards it.

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This follows the same theory as above. Sample implementation for fixing memory leak is given below:. We should always cancel the asyncTask when activity is destroyed. This is because the asyncTask will still be executing even if the activity is destroyed. NEVER reference a class inside the activity. Use a weakReference of the textview. If we definitely need to, we should set the class as static. Messages posted to the message queue will hold a reference to the Handler so that the framework can call Handler handleMessage Message when the Looper eventually processes the message.

Use a weakReference of the Activity. We can repeat this same mistake again with both the Thread and TimerTask classes. Non-static anonymous classes hold an implicit reference to their enclosing class. Close thread in activity onDestroy to avoid thread leak. The same principle is as Threads can be followed for TimerTask as well.

Eight Ways Your Android App Can STOP Leaking Memory

Cancel timer in activity onDestroy to avoid memory leak. So basically to summarise: Generally, to ms is the threshold beyond which users will perceive slowness in an application [1]. In Android, application responsiveness is monitored by the Activity Manager and Window Manager system services. Android will display the ANR dialog for a particular application when it detects one of the following conditions [1]:. I am sure no users would love to see this app not responding popup. When your app has memory leaks, it cannot claim memory from unused objects.

As a result, it will ask Android system for more memory.

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  • Memory Leak Patterns in Android – AndroidPub.
  • But there is a limit. The system will eventually refuse to allocate more memory for your app. When this happens, app user will get an out-of-memory crash. Of course no one likes crashes. Users might uninstall your app or start giving your app bad reviews. They are hard to reproduce.

    Dealing with Memory Leaks from Anonymous Classes in Android | Jana Technology

    And the crash report is usually hard for reasoning because it can happen any time, anywhere when memory allocation is refused by Android system. Finding leaks requires good understanding on how GC works. It requires diligence in writing code and code review. But in Android, there are some good tools which can help you identify possible leaks or make sure if there is a leak when some piece of code seems suspicious. Leak Canary from Square is a good tool for detecting memory leaks in your app.

    It creates weak references to activities in your app. You can also customize it by adding watches to any other objects. It then checks if the reference is cleared after GC. If not, it dumps heap into a. If there is one, it shows a notification and in a separate app, it shows the reference tree of how the leak happens. You can find more about Leak Canary in this article: Detect all memory leaks. It helps developers and QA to find memory leaks before your app reaches the hands of your users.

    Android Studio has a handy tool for detecting memory leaks. If you suspect a piece of code in you app might leaks an Activity, you can do this. Step 1: Compile and run the debug build on a device or emulator connecting to you computer. Step 2: Go to the suspicious activity, then go back to previous activity which will pop the suspicious activity from the task stack. Step 3: Then click on Dump Java Heap button.

    Step 4: In the hprof file viewer, there are a couple of ways you can check the memory leak.


    You can use the Analyzer Tasks tool on the top right conner to detect leaked activities automatically. Or you can switch the view mode to Package Tree View from top left conner, find the activity which should be destroyed. Check the Total Count of the activity object. If there are 1 or more instances, it means there is a leak. Step 5: Once you find the leaked Activity, check the reference tree on the bottom and find out what object is referencing the should-have-been-dead activity.

    There are lots of ways you can cause a memory leak in Android. To summarize, there are mainly three categories. If an object is being garbage collected and is only referenced weakly, we let it go. For our purposes this is just what we want; Instead of passing the context as a strong reference to the inner class, we pass it as a weak reference.

    In this way, we allow the activity to be released if it hits the destruction part of its lifecycle before our inner class has been executed and cleaned up. This is the same code as earlier, but without memory leaks: Now our app can happily move on without clogging memory with old, unused references, and be sure that the things it wants to forget remain forgotten. You are commenting using your WordPress. You are commenting using your Twitter account.

    You are commenting using your Facebook account. Notify me of new comments via email. Consider the following, rather benign looking code: Published on: December 30, December 30, Author: