1) setting the Project Options, Uses Permissions, Wake lock = True
2) Adding Android.JNI.PowerManager to the uses clause
3) call:
AcquireWakeLock; // at start up.
ReleaseWakeLock; // at shutdown.
//-----------------------------------------------------------
unit Android.JNI.PowerManager;
interface
function AcquireWakeLock : Boolean;
procedure ReleaseWakeLock;
implementation
uses
System.SysUtils,
Androidapi.Helpers,
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<JWakeLockClass, JWakeLock>) 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 & 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 & 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<JPowerManagerClass, JPowerManager>) 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(‘Runing‘));
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.