How to prevent device from sleep while application is running

[Abin]

Hi,

I have an android application to show slideshow. The device after some time, gets the screen dim, and goes off and locked. How can I avoid this, until user quits the application.

Like similar to "android.permission.WAKE_LOCK" and call some functions.. I'm not sure exactly.

Thanks in advance :)

[cezmen]

One solution, if I'm not wrong, is :

[ANDROID]
Go to Settings -> Security -> Screen Lock and select NONE

[iOS]
Go to Settings -> General -> Auto-Lock and select NEVER

I'm not sure this can be done programatically (probably not using Qt). But (on Android) using Java Native Interface (JNI), it can :

http://stackoverflow.com/questions/4736354/how-to-enable-or-disable-autolock-in-android

[Abin]

Thanks for the reply.

Screen Lock - > select NONE will only just doesn't lock the device, but the screen will dim and turns off after the set timeout in setting->Display->Dimmer and Settings->Display->Sleep. These settings doesn't have a NONE option. :(

So from Qt there is no way to acquire this?

[peterlin82]

You can add
getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
on QtActivity.java

[Abin]

peterlin82 : can you tell me where to add? I have no idea where is QtActivity.java

My application code is just same like desktop application:

@#include "pricechecker.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
PriceChecker w;
w.show();

QFile styleFile (":/style/styleFile.qss");
if (true == styleFile.open(QFile::ReadOnly))
{
    QString style(styleFile.readAll());
    a.setStyleSheet(style);
}

return a.exec();

}
@

I am using Qt 5.2