<![CDATA[[SOLVED]How to keep the backlight on(Android)?]]>I develop android app with Qt 5.1.0 RC1.
I want to keep the backlight on.

@#include <android/native_activity.h>

ANativeActivity *theActivity;
ANativeActivity_setWindowFlags(theActivity,AWINDOW_FLAG_KEEP_SCREEN_ON,0);@

but compile error:
undefined reference to 'ANativeActivity_setWindowFlags'

Someone can help me?
thanks a lot.

]]>https://forum.qt.io/topic/28534/solved-how-to-keep-the-backlight-on-androidRSS for NodeMon, 13 Apr 2026 21:17:33 GMTFri, 21 Jun 2013 00:35:02 GMT60<![CDATA[Reply to [SOLVED]How to keep the backlight on(Android)? on Mon, 21 Apr 2014 17:20:35 GMT]]>Thank you, Peterlin, that achieved the same result for me.

Note: If someone uses Qt 5.2, modifies the QtActivity.java file and then that file is automatically overwritten, in my case it was very useful "that article":http://blog.qt.digia.com/blog/2013/12/12/implementing-in-app-purchase-on-android (people can search there the text "Next, I added a new Activity subclass") and "that example":http://qt-project.org/doc/qt-5/qtandroidextras-notification-example.html.

]]>https://forum.qt.io/post/201319https://forum.qt.io/post/201319Mon, 21 Apr 2014 17:20:35 GMT<![CDATA[Reply to [SOLVED]How to keep the backlight on(Android)? on Fri, 18 Apr 2014 05:23:34 GMT]]>I don't know how to obtain the pointer to the native activity running your Qt app.
and that seems to be not necessary.

I solved by add
getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
on QtActivity.java

]]>https://forum.qt.io/post/201315https://forum.qt.io/post/201315Fri, 18 Apr 2014 05:23:34 GMT<![CDATA[Reply to [SOLVED]How to keep the backlight on(Android)? on Tue, 01 Apr 2014 16:10:54 GMT]]>By the way, about the code:
@ANativeActivity *theActivity;
ANativeActivity_setWindowFlags(theActivity,AWINDOW_FLAG_KEEP_SCREEN_ON,0);
@
I've been searching for this for several days :-( : Please, how can you obtain the pointer to the native activity running your Qt app?

]]>https://forum.qt.io/post/201265https://forum.qt.io/post/201265Tue, 01 Apr 2014 16:10:54 GMT<![CDATA[Reply to [SOLVED]How to keep the backlight on(Android)? on Thu, 27 Mar 2014 19:32:23 GMT]]>Thank you, Moster!

If it can be useful to anyone, in my case (Qt 5.2.1, QtCreator 3.0.1, Android NDK, Revision 9c):

  1. I added the line "#include <android/window.h>".

  2. In QtCreator I edited the .pro file, in the editor section I clicked with the secondary button to make the contextual menu appear, I chose "Add Library...", I chose "System Library", I clicked on "Browse...", I chose the file [...]/android-ndk-r9c/platforms/android-19/arch-arm/usr/lib/libandroid.so
    I clicked on "Next", a dialog was shown saying "The following snippet will be added to [...]", I clicked on "Finish" and, finally, this line was added to the .pro file:

unix|win32: LIBS += -landroid

]]>https://forum.qt.io/post/201255https://forum.qt.io/post/201255Thu, 27 Mar 2014 19:32:23 GMT<![CDATA[Reply to [SOLVED]How to keep the backlight on(Android)? on Fri, 21 Jun 2013 06:08:00 GMT]]>You are missing some libraries in the .pro file probably.

LIBS += -L$$PWD/../../android-ndk-r8d/platforms/android-14/arch-arm/usr/lib/ -landroid

INCLUDEPATH += $$PWD/../../android-ndk-r8d/platforms/android-14/arch-arm/usr/include/android
DEPENDPATH += $$PWD/../../android-ndk-r8d/platforms/android-14/arch-arm/usr/include/android

You need to replace them with your corresponing directory. I hope that this is enough

For the anative window flags you might need to include <window.h>

]]>https://forum.qt.io/post/183684https://forum.qt.io/post/183684Fri, 21 Jun 2013 06:08:00 GMT