[SOLVED] How can i call an other App from a Qt App for Androids?

[xmaze]

Hello!!

I try to design an App with Qt , the Qt app reads a tcp connection for RTLSDR raw data and then demodulate the ADSB signal.
Because i cannot find a solution to read the usb device with libusb in Android i found a JAVA app from martin martinov, at this link https://play.google.com/store/apps/details?id=marto.rtl_tcp_andro&hl=en.
This App sends the raw data via TCP connection. So i have to start this App manually, but it is very troublesome for a user.
The developer of this App says that we can call a new intent from an other App behind the scenes.
All i need is to launch an intent in the form iqsrc://-f 1090000000 -s 200000 - a 127.0.0.1 -g 100.

How can i do that with QT ?
Thank you very much in advance !!
Also i need some testers so if you want send an invite to this group for more infos :https://groups.google.com/forum/#!forum/trackyourflight

[SGaist]

Hi,

The QtAndroid might contain what you need

Hope it helps

[jalomic]

Use http://doc.qt.io/qt-5/qtandroid.html

Or use java + JNI. In android Qt examples you can find "NotificationClient" ( "Qt notifier" )

[xmaze]

@SGaist said:

Hi,

The QtAndroid might contain what you need

Hope it helps

Thank you i think is useful cause i didnt see this Class, is there also a tutorial ?

[xmaze]

@jalomic said:

Use http://doc.qt.io/qt-5/qtandroid.html

Or use java + JNI. In android Qt examples you can find "NotificationClient" ( "Qt notifier" )

What is better ? SGaist has also a suggestion ?

[jalomic]

@xmaze it amounts to the same thing
QAndroidJniObject - its nice JNI wrapper. For example QtAndroid ::androidActivity() - returns QAndroidJniObject, and you can call any method of your activity etc. =)
In "Qt notifier" Example you can see how to create your own main java activity.

[xmaze]

if i started ok then i need something like this

QtAndroid::startActivity("marto.rtl_tcp_andro.DeviceOpenActivity",0,0);

but i cannot understand where i have to put the command
"iqsrc://-f 1090000000 -s 2000000 - a 127.0.0.1 -g 100"
Some help please ?

[jalomic]

@xmaze said:

iqsrc://-f 1090000000 -s 2000000 - a 127.0.0.1 -g 100

For QtAndroid::startActivity you must create intent first !

QAndroidJniObject url=QAndroidJniObject::fromString("iqsrc://-f 1090000000 -s 2000000 - a 127.0.0.1 -g 100");
QAndroidJniObject intent=QAndroidJniObject::callStaticObjectMethod("android/content/Intent","parseUri","(Ljava/lang/String;I)Landroid/content/Intent;", url.object<jstring>(),0x00000001);
QtAndroid::startActivity(intent,code,receiver)

[xmaze]

@jalomic

Oh my Got, Thank you very much!! This is very complicated, i couldn't find it, never!!

[jalomic]

@xmaze =) There is an much easier way
QDesktopServices::openUrl((QUrl("iqsrc://-f 1090000000 -s 2000000 - a 127.0.0.1 -g 100"))

or just from QML

onClicked: Qt.openUrlExternally(iqsrc://-f 1090000000 -s 2000000 - a 127.0.0.1 -g 100")

[jalomic]

@xmaze And it is very interesting for me. Does it work startActivity as i showed befor ? I have no chance to check it

[xmaze]

@jalomic
Thanks, but how can i call the intent? i mean the other Application!

[xmaze]

@jalomic

QAndroidJniObject url=QAndroidJniObject::fromString("iqsrc://-f 1090000000 -p 5000 -s 2000000 -a 127.0.0.1 -g 100");
QAndroidJniObject intent=QAndroidJniObject::callStaticObjectMethod("marto/rtl_tcp_andro/DeviceOpenActivity","parseUri","(Ljava/lang/String;I)Lmarto/rtl_tcp_andro/DeviceOpenActivity;", url.object<jstring>(),0x00000001);
QtAndroid::startActivity(intent,0,0);

I tried this code but i have a black screen, i call this in Constructor of the QMainWindow, i am not sure if i call right the Application, i am not sure about the
marto/rtl_tcp_andro/DeviceOpenActivity

[jalomic]

@xmaze Qt.openUrl** does it work ?

And replace your "marto/rtl_tcp_andro/DeviceOpenActivity" by "android/content/Intent"

[jalomic]

@xmaze just copy and paste my code of creating intent

[xmaze]

@jalomic code and receiver is not something, i change this to null.

ok, it calls the other app but how can i wait for the other app to complete the intialitation before to process the qt app. I am not sure also if all the arguments are right, i have to make some tests and i write the results the next hours!
thanks

[xmaze]

@jalomic

Thank you it's working!!
I made a workaround, i put a sleep() function for 4 seconds to wait until the other App is started!!

[jalomic]

@xmaze Work what ? QDesktopServices::openUrl ? Or Intent ? Did you try openUrl ?

[xmaze]

@jalomic the intent the intent, i didn't try the other solution!

[jalomic]

@xmaze Amazing =)