Using JNI

NickV

Hi,
i want to do the following with Qt QAndroidJniObject:

wakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "My Tag");

The problem is that i can not do the pipe ( | ) with qt.
My code is

QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "activity", "()Landroid/app/Activity;");
   if ( activity.isValid() )
   {
       QAndroidJniObject serviceName = QAndroidJniObject::getStaticObjectField<jstring>("android/content/Context","POWER_SERVICE");
       if ( serviceName.isValid() )
       {
           QAndroidJniObject powerMgr = activity.callObjectMethod("getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;",serviceName.object<jobject>());
           if ( powerMgr.isValid() )
           {
               jint levelAndFlags = QAndroidJniObject::getStaticField<jint>("android/os/PowerManager","SCREEN_DIM_WAKE_LOCK");

               QAndroidJniObject tag = QAndroidJniObject::fromString( "My Tag" );

               m_wakeLock = powerMgr.callObjectMethod("newWakeLock", "(ILjava/lang/String;)Landroid/os/PowerManager$WakeLock;", levelAndFlags,tag.object<jstring>());
           }
       }
   }

Anu help????

mrjj

Hi
For me it looks like an binary OR of enum values. ( like setFlags)
( PowerManager.SCREEN_DIM_WAKE_LOCK OR'ED PowerManager.ACQUIRE_CAUSES_WAKEUP )
But in java this mean some else?

aha_1980

@mrjj said in Using JNI:

Hi
For me it looks like an binary OR of enum values. ( like setFlags)
( PowerManager.SCREEN_DIM_WAKE_LOCK OR'ED PowerManager.ACQUIRE_CAUSES_WAKEUP )
But in java this mean some else?

I think it's exactly the same in Java and C++

NickV

Could you please give a sample of code?
I don't understand what exactly i have to do.

mrjj

Hi
Syntax should be the same.
https://www.somacon.com/p125.php
For the OR part but are you talking about the actual pm.newWakeLock call or
simply the
PowerManager.SCREEN_DIM_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP ?

NickV

If i use | this cause error. It says that there is not such flag.

mrjj

@NickV
Hi
can you show exact error ?
Maybe it just dont know PowerManager.SCREEN_DIM_WAKE_LOCK etc.

NickV

java.lang.NoSuchFieldError: no "I" field "SCREEN_DIM_WAKE_LOCK|ACQUIRE_CAUSES_WAKEUP" in class "Landroid/os/PowerManager;" or its superclasses

mrjj

@NickV
Oh, we read it all completely wrong.
Its not in c++ , but java ?

NickV

I am using QAndroidJniObject in order to call power manager and set cpu flags. The code is the above code that i've posted. Look the initial post.

mrjj

@NickV
Hi
Seems like it dont know
PowerManager.SCREEN_DIM_WAKE_LOCK
Do you know where its normally defined ?

NickV

No. If i use only SCREEN_DIM_WAKE_LOCK no error produced. Look this link

mrjj

@NickV
But it dont work without PowerManager.ACQUIRE_CAUSES_WAKEUP ?

NickV

No it works but i need this extra flag in order to do some work.

mrjj

@NickV
But did u look where SCREEN_DIM_WAKE_LOCK is defined ?
Does it define the ACQUIRE_CAUSES_WAKEUP at all ?
maybe it was added in later version of the SDK.

NickV

Ok! Thanks for your response!

raven-worx

@NickV
For me something is not clear, did you already try the following or not?!

jint levelAndFlags = QAndroidJniObject::getStaticField<jint>("android/os/PowerManager","SCREEN_DIM_WAKE_LOCK") | QAndroidJniObject::getStaticField<jint>("android/os/PowerManager","ACQUIRE_CAUSES_WAKEUP");