[转]delphi xe6 android屏幕操持常亮

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.