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PODelphi XE5 Android. How to use PowerManager.WakeLock?
 

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  1. PODelphi XE5 Android. How to use PowerManager.WakeLock?
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    <p>I'd like to keep device on and avoid unloading my application from memory even while there is no user activity. Something like service. I made module like <a href="https://stackoverflow.com/questions/18888345/how-to-check-if-network-is-available-on-android-delphi-xe5">How to check if network is available on Android and iOS ( Delphi XE5 )</a> but system crushes when I run SetWakeLock:</p> <pre><code>unit Android.PowerManager; interface function SetWakeLock : boolean; procedure ReleaseWakeLock; implementation uses System.SysUtils, Androidapi.JNI, Androidapi.JNIBridge, Androidapi.JNI.GraphicsContentViewText, Androidapi.JNI.JavaTypes, FMX.Helpers.Android; type JPowerManager = interface; JWakeLock = interface; JWakeLockClass = interface(JObjectClass) ['{4CF7A13D-15A9-4DEE-8CA7-66600C188CB7}'] end; [JavaSignature('android/os/PowerManager/WakeLock')] JWakeLock = interface(JObject) ['{55983EDC-782F-490A-BF0C-12207EB7829E}'] {Methods} procedure acquire; cdecl; procedure release; cdecl; function isHeld: Boolean; cdecl; end; TJWakeLock = class(TJavaGenericImport&lt;JWakeLockClass, JWakeLock&gt;) end; JPowerManagerClass = interface(JObjectClass) ['{B127DD4E-1DA6-49E7-98BA-5966DC7E26FA}'] end; [JavaSignature('android/os/PowerManager')] JPowerManager = interface(JObject) ['{241C3B3D-3DF0-489B-A33E-3CD7F5D26313}'] {Methods} function newWakeLock(levelAndFlags: integer; tag: JString): JWakeLock; cdecl; end; TJPowerManager = class(TJavaGenericImport&lt;JPowerManagerClass, JPowerManager&gt;) end; function GetPowerManager: JPowerManager; var PowerServiceNative: JObject; begin PowerServiceNative := SharedActivityContext.getSystemService(TJContext.JavaClass.POWER_SERVICE); if not Assigned(PowerServiceNative) then raise Exception.Create('Could not locate Power Service'); Result := TJPowerManager.Wrap( (PowerServiceNative as ILocalObject).GetObjectID); if not Assigned(Result) then raise Exception.Create('Could not access Power Manager'); end; var fWakeLock : JWakeLock = nil; function SetWakeLock : boolean; var PowerManager: JPowerManager; begin result := fWakeLock&lt;&gt;nil; if result then begin PowerManager := GetPowerManager; fWakeLock := PowerManager.newWakeLock(1,StringToJString('VC')); //PARTIAL_WAKE_LOCK =1 Result := fWakeLock&lt;&gt;nil; if Result then begin fWakeLock.acquire; Result := fWakeLock.IsHeld; end; end else if not fWakeLock.IsHeld then fWakeLock.acquire; end; procedure ReleaseWakeLock; begin if fWakeLock&lt;&gt;nil then begin fWakeLock.release; end; end; end. </code></pre>
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