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PORead WIFI_SLEEP_POLICY on Nexus 7
 

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  1. PORead WIFI_SLEEP_POLICY on Nexus 7
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    <p>I'm building an app that must keep the Wi-Fi connection alive in the background. Therefore it is important that the device doesn't auto shutdown Wi-Fi when the device goes to sleep.</p> <p>Therefore I would like to check for the current Wi-Fi Sleep policy on the device, and if it is the wrong one, I would like to inform the users about it and link them to the right settings page so they can change it.</p> <p>In order to do this I`ve written the following code:</p> <pre><code>@SuppressWarnings("deprecation") @SuppressLint({ "InlinedApi", "NewApi" }) private void checkWiFiPolicy() { ContentResolver cr = this.getContentResolver(); int apiLevel = 0; try { apiLevel = Build.VERSION.SDK_INT; } catch (Exception e) {} int apiIndWifiSleepPolicyDefault = -1; int apiIndWifiSleepPolicyNever = -1; int apiIndWifiSleepPolicyNeverWhilePlugged = -1; int currentWifiPolicy = -10; if (apiLevel &lt; 17) { apiIndWifiSleepPolicyDefault = Settings.System.WIFI_SLEEP_POLICY_DEFAULT; apiIndWifiSleepPolicyNever = Settings.System.WIFI_SLEEP_POLICY_NEVER; apiIndWifiSleepPolicyNeverWhilePlugged = Settings.System.WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED; try { currentWifiPolicy = Settings.System.getInt(cr, android.provider.Settings.System.WIFI_SLEEP_POLICY); } catch (Exception e) {} } else { apiIndWifiSleepPolicyDefault = Settings.Global.WIFI_SLEEP_POLICY_DEFAULT; apiIndWifiSleepPolicyNever = Settings.Global.WIFI_SLEEP_POLICY_NEVER; apiIndWifiSleepPolicyNeverWhilePlugged = Settings.Global.WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED; try { currentWifiPolicy = Settings.Global.getInt(cr, android.provider.Settings.Global.WIFI_SLEEP_POLICY); } catch (Exception e) { e.printStackTrace(); } } if (currentWifiPolicy == apiIndWifiSleepPolicyDefault) { ALog.d(ALog.TAG_ACTIVITY, "Detected WifiSleepPolicy: DEFAULT"); } else if (currentWifiPolicy == apiIndWifiSleepPolicyNever) { ALog.d(ALog.TAG_ACTIVITY, "Detected WifiSleepPolicy: NEVER"); } else if (currentWifiPolicy == apiIndWifiSleepPolicyNeverWhilePlugged) { ALog.d(ALog.TAG_ACTIVITY, "Detected WifiSleepPolicy: NEVER WHILE PLUGGED"); } else { ALog.d(ALog.TAG_ACTIVITY, "Detected WifiSleepPolicy: UNKNOWN"); } } </code></pre> <p>This code however fails on a Nexus 7 (Android 4.3, Gen. 1):</p> <pre><code>W/System.err(5318): android.provider.Settings$SettingNotFoundException: wifi_sleep_policy </code></pre> <p>Even if I try the legacy approach (the one I use for apiLevel &lt; 17), I get exactly the same error. (Note that I am able to read other System settings such as System.Global.DATA_ROAMING)</p> <p>Any Ideas on how I can read this Setting on a Nexus 7?</p>
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    1. USJeroen Mols
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    1. COWhy not just hold a `WifiLock`?
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      1. PORead WIFI_SLEEP_POLICY on Nexus 7
      1. USCommonsWare
    2. COBecause the system setting WIFI_SLEEP_POLICY is able to overwrite the Wi-Fi locks, so that won't work. (And I'm already holding one)
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      1. PORead WIFI_SLEEP_POLICY on Nexus 7
      1. USJeroen Mols
    3. CO"Because the system setting WIFI_SLEEP_POLICY is able to overwrite the Wi-Fi locks, so that won't work" -- do you have a reference for this? That seems rather odd, as the point behind a `WifiLock` is to temporarily override such rules, just as the point behind a `WakeLock` is to temporarily override the CPU-can-go-to-sleep rules.
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      1. PORead WIFI_SLEEP_POLICY on Nexus 7
      1. USCommonsWare
 

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