Nought(7.0)미만 WifiManager 메모리 누수 문제

Android Nought(7.0)미만에서 WindowWifi사용시 메모리 누수문제

Android Document

WifiManager

public class WifiManager 
extends Object 

java.lang.Object
↳	android.net.wifi.WifiManager

---

This class provides the primary API for managing all aspects of Wi-Fi connectivity.

On releases before Build.VERSION_CODES.N, this object should only be obtained from an Context#getApplicationContext(), and not from any other derived context to avoid memory leaks within the calling process.

StackOverflow

As the error suggests, it seems that WiFiManager must use the ApplicationContext, as opposed to the ActivityContext, otherwise a memory leak can occur. The error was triggered by following code:

WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);

To fix the issue I replaced the above line with:

WifiManager wifi = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

수정전

wifiManager = context.getSystemService(Context.WIFI_SERVICE) as WifiManager

수정후

wifiManager = context.applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager

Document: https://developer.android.com/reference/android/net/wifi/WifiManager

StackOverflow: https://stackoverflow.com/questions/42621010/signed-apk-error-wifimanagerleak