I follow the following link's sample code
http://android.dronekit.io/first_app.html
and when I set API VehicleApi.getApi(this.drone).arm(true);
vehicleState.isFlying() automatically becomes true.
Can anybody tell me what this problem is?
What I need is:
1. take off, land
I read from some website that the dronekit-android does not support the mode changing. If so, how should I send the mavlink message to take off and land?
So far, I can sucessfully send the mavlink message to the PX4 board.
Thanks for replying.
Thank you for replying.
BR
SeanH
If you trace though some of the code in dronekit-android, you can see that isFlying is set here with the code below.
boolean isFlying = systemStatus == MAV_STATE.MAV_STATE_ACTIVE || ...;
MAV_STATE_ACTIVE, defined here states
System is active and might be already airborne. Motors are engaged.
So isFlying doesn't mean it's airborne but just that the motors are turned on. That occurs when you call VehicleApi.getApi(this.drone).arm(true); because you are literally arming the vehicle at that point.
For takeoff, you want to use the ControlApi. ControlApi.getApi(drone).takeOff(desired_altitude, listener) and for land you need to use VehicleApi.getApi(drone).setVehicleMode(VehicleMode.COPTER_LAND, listener)
The sample code you're looking at is very old. I suggest you follow the sample app from github.
I have not tried android-dronekit before and I noticed that the src folder have not been updated for more than two years on github.
I advice you to use python-dronekit because there is a powerful library called pymavlink in python and used in python-dronekit. You can build hyper application if you want but first try to takeoff and land in python.
Related
I am writing an Android application to control a Nest thermostat. I was able to connect to it just fine and I can read the correct target temperature (turning the nob on the thermostat updates my TextView).
However, when I try to write the target temperature like this, nothing happens:
String thermostatID = mThermostat.getDeviceId();
mNest.thermostats.setTargetTemperatureF(thermostatID, 70);
I tried setting the HVAC mode first, in case I needed that, but this didn't work either:
String thermostatID = mThermostat.getDeviceId();
mNest.thermostats.setHVACMode(thermostatID, "cool");
mNest.thermostats.setTargetTemperatureF(thermostatID, 70);
The Textview flashes 70 for a brief second, but then shoots back up to 77 which is the target temperature that was set by the actual thermostat. Is this an issue with the SDK code for setTargetTemperatureF, or am I missing something simple here?
The permissions for the Nest thermostat are set on the Nest website. Visit https://developer.nest.com/products and sign in. You will be given a list of your products, all you need to do is select one and scroll down to permissions.
Note that after you change permissions, your mobile (or various platform) application will need to rerun authentication for this change to take place.
Try to modify your code as following, then you can set the target temperature.
mNest.setTargetTemperatureF(thermostatID, 70L, null);
thanks for checking my question out!
I'm currently working on a project using Qt C++, which is designed to be multi-platform. I'm a bit of a newcoming to it, so I've been asked to set up the ability to take screenshots from within the menu structure, and I'm having issues with the Android version of the companion app.
As a quick overview, it's a bit of software that send the content of a host PC's screen to our app, and I've been able to take screenshots on the Windows version just fine, using QScreen and QPixmap, like so:
overlaywindow.cpp
{
QPixmap screenSnapData = screenGrab->currentBackground();
}
screenGrabber.cpp
{
QScreen *screen = QGuiApplication::primaryScreen();
return screen->grabWindow( QApplication::desktop()->winId() );
}
Unfortunately, Android seems to reject QScreen, and with most suggestions from past Google searches suggesting the now-deprecated QPixmap::grab(), I've gotten a little stuck.
What luck I have had is within the code for the menu itself, and QWidget, but that isn't without issue, of course!
QFile doubleCheckFile("/storage/emulated/0/Pictures/Testing/checking.png");
doubleCheckFile.open(QIODevice::ReadWrite);
QPixmap checkingPixmap = QWidget::grab();
checkingPixmap.save(&doubleCheckFile);
doubleCheckFile.close();
This code does take a screenshot, but only of the button strip currently implemented, and not for the whole screen. I've also taken a 'screenshot' of just a white box with the screen's dimensions by using:
QDesktopWidget dw;
QWidget *screen=dw.screen();
QPixmap checkingPixmap = screen->grab();
Would anyone know of whether there was an alternative to using QScreen to take a screenshot in Android, or whether there's a specific way to get it working as compared to Windows? Or would QWidget be the right track? Any help's greatly appreciated!
as i can read in Qt doc : In your screenGrabber.cpp :
QScreen *screen = QGuiApplication::primaryScreen();
return screen->grabWindow( QApplication::desktop()->winId() );
replace with :
QScreen *screen = QGuiApplication::primaryScreen();
return screen->grabWindow( 0 ); // as 0 is the id of main screen
If you want to take a screenshot of your own widget, you can use the method QWidget::render (Qt Doc):
QPixmap pixmap(widget->size());
widget->render(&pixmap);
If you want to take a screenshot of another app/widget than your app, you should use the Android API...
I want to show image (png,jpg etc) in dynamically created (as per requirement and fully through coding) TImage component, at runtime in C++ builder xe8 (not delphi). But I dont want to use opendialogbox (suggested in many web sites). I want to run this app on my android device. I tried to use LoadFromFile(), it crashes the app on android, but when I run this on windows, its running smoothly. I am just a beginner to c++ builder. So guys pls help. Thanx in advance for any kind of help.Here is what I did.
void __fastcall TForm1::TForm1(TComponent* Owner)
{
TImage* img = new TImage(this);
img->Parent = this;
img->Bitmap->LoadFromFile("D:\\res\\profile.png");
}
Did you see what is the error?
If you run the program with the provided by you code I assume the error would be that the file is not found, because there is no such directory "D:\" in android.
One way to set the path is to write a static path which points to your image. For example : "/storage/sdcard0/DCIM/Camera/MyImage.jpg";
The second way is to include the <System.IOUtils.hpp> header and to use some built-in functions like:
System::Ioutils::TPath::GetPicturesPath();
System::Ioutils::TPath::GetAlarmsPath();
You can check them out, they might be useful.
So I noticed when I was debugging that there seems to be a tag that's repeating through my app entitled "BubblePopupHelper" with text: "isShowingBubblePopup : false"
Screenshot of the log
To my knowledge, I'm not using or causing it. Does anyone have an idea of what's going on? The application is the one I'm writing.
Upon further inspection, I did notice that every time I'm updating text (via a TextView) it displays onscreen. If there's a better way of doing so, please let me know.
Thanks!
The message seems to be logged by some SDK libraries whenever setText is called in a TextView. I get it in Android Studio developing with min API 14.
One interim solution till Google removes it would be using the filtering feature of Android Studio by writing a RegEx that only includes your log messages. For example if I have all my tags start with 'Braim' then 'Braim.*' can be used
If you want to filter this annoying logs away you can use the following regex:
by Log Tag: (?!^BubblePopupHelper)(^.*$)
Have you added "OnGlobalLayoutListener"?
I've encountered same problem and finally I found that getViewTreeObserver().addOnGlobalLayoutListener caused the problem.
Here is my solution:
textView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
...
textCategory.getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
});
i'm trying to do a fallback on a timeout event!
ive set super.setingeterproperty("loadurltimeoutvalue", 60") so i can simulate it. Been searching around and havent found alot of answers to this.
I'm trying to do this: if timeout event -> load page from assets folder.
this so i can hide the error message that occurs on timeout. that error message contains the address to the site being loaded, and i dont want that at all to show up anywhere.
if (mWebView.loadUrlTimeout == currentLoadUrlTimeout) {
//super.loadurl("android_assets bla bla")
}
Found that code here, but cant get it to work. i think there are lots of parts missing, to the code, as i tried stripping it.
I am still pretty fresh to this, so there might be really logical flaws which i just dont see.
Any help greatly appreciated :)
Try setting following property in the activity before loading the page, it should work:
super.setStringProperty("errorUrl", "file:///android_asset/www/error_page.html");
setStringProperty has been deprecated in 3.0. Use config.xml instead:
<preference name="ErrorUrl" value="myErrorPage.html"/>