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    <p>Ignoring the wrong-looking logic that I cited in a comment, you're not referring to a nested class correctly in the interface declaration.</p> <p>This unit works for me. Note I'm using a screen wake lock (which is deprecated, but still works).</p> <pre><code>unit Android.JNI.PowerManager; interface function AcquireWakeLock : 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) ['{918E171F-CDB8-4464-9507-F49272CE7636}'] end; [JavaSignature('android/os/PowerManager$WakeLock')] JWakeLock = interface(JObject) ['{D17B1136-FA15-4AEB-85B1-2D490F0FD320}'] {Methods} procedure acquire; cdecl; procedure release; cdecl; function isHeld: Boolean; cdecl; end; TJWakeLock = class(TJavaGenericImport&lt;JWakeLockClass, JWakeLock&gt;) end; JPowerManagerClass = interface(JObjectClass) ['{7D0696A2-ADEA-4158-AE1F-5E720DEDBCF9}'] {Property methods} function _GetFULL_WAKE_LOCK: Integer; cdecl; function _GetSCREEN_BRIGHT_WAKE_LOCK: Integer; cdecl; function _GetSCREEN_DIM_WAKE_LOCK: Integer; cdecl; function _GetPARTIAL_WAKE_LOCK: Integer; cdecl; {Properties} //Keep screen on bright &amp; keyboard on //Deprecated in API level 17 - Jelly Bean MR1 property FULL_WAKE_LOCK: Integer read _GetFULL_WAKE_LOCK; //Keep screen on bright //Deprecated in API level 13 - Honeycomb MR2 property SCREEN_BRIGHT_WAKE_LOCK: Integer read _GetSCREEN_BRIGHT_WAKE_LOCK; //Keep screen on dim //Deprecated in API level 17 - Jelly Bean MR1 property SCREEN_DIM_WAKE_LOCK: Integer read _GetSCREEN_DIM_WAKE_LOCK; //Keep CPU running, screen &amp; keyboard can go off property PARTIAL_WAKE_LOCK: Integer read _GetPARTIAL_WAKE_LOCK; end; [JavaSignature('android/os/PowerManager')] JPowerManager = interface(JObject) ['{DEAED658-4353-4D17-B0A3-8179E48BE87F}'] {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 WakeLock: JWakeLock = nil; function AcquireWakeLock: Boolean; var PowerManager: JPowerManager; begin Result := Assigned(WakeLock); if not Result then begin PowerManager := GetPowerManager; WakeLock := PowerManager.newWakeLock( TJPowerManager.JavaClass.SCREEN_BRIGHT_WAKE_LOCK, StringToJString('Delphi')); Result := Assigned(WakeLock); end; if Result then begin if not WakeLock.IsHeld then begin WakeLock.acquire; Result := WakeLock.isHeld end; end; end; procedure ReleaseWakeLock; begin if Assigned(WakeLock) then begin WakeLock.release; WakeLock := nil end; end; end. </code></pre>
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    1. COThanks! It's working fine for me too. )))
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    2. COI think one more correction is need: procedure ReleaseWakeLock; begin if Assigned(WakeLock) then begin WakeLock.release; WakeLock := nil; end; end;
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    3. COYes, probably a good idea to tidy up when done. I'll edit my post accordingly.
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