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Running an App on a Device
3:52Thus far we have been running our apps with the emulator from within Android Studio. In this video we'll see how we can launch our apps directly to a device!
There's one very important thing
we haven't talked about yet.
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So far, we've only run the app in the
emulator, but how do we run it on a phone?
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It's usually pretty easy, but
it does depend on your phone and
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the computer you're using.
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Even if you don't have a phone to test on,
this will still be useful to know.
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On a Mac, PC or Linux computer,
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start by just connecting your phone
to the computer with the USB cable.
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You may need to disconnect the USB
cable from your charging adapter.
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If you're using a Windows or Linux
computer, this is where it can get tricky.
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You need the appropriate
device drivers for your phone.
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Some standard drivers are included in the
Android development bundle we're using.
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But in some cases,
you'll be prompted to download and
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install the drivers when
you connect your phone.
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Or you might need to visit the website of
the manufacturer to get the right drivers.
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Or maybe you've already installed
some software that includes
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the necessary drivers.
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Each device is different, and
sometimes it can be tricky.
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But if you have any trouble,
check the community or
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Google how to connect your specific
device for testing Android apps.
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I'll also post some helpful notes in
the teacher's notes on this page.
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There's a special place in
the Android Studio that shows us
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all of our connected devices,
including our emulator.
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It's down here in the bottom pane
at the top left of the Logcat tab.
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It should show the phone or
tablet you just connected, and
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maybe the emulator too, like mine does.
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If your device isn't listed here,
then you may need to enable USB debugging.
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Let's take a quick look
at how to set that up.
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On your phone or tablet,
go to the Android settings
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page, Then scroll all
the way to the bottom.
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And open the About Phone or, in my case,
the About emulated device section.
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Then scroll to the bottom again, and
tap seven times on the build number.
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This may seem a bit weird, but
it's what turns on the developer options.
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Now go back and
open the developer options section.
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Then scroll down to USB debugging and
make sure that it's turned on.
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And hit OK to allow USB debugging.
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You might get a notification on the phone
that USB debugging is now activated.
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If your device is listed
here like mine is,
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then that means you're ready
to run apps on your device.
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We can run our app using
the same run button or
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keyboard shortcuts that we've been using.
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I'll use the Run button.
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Wait, we don't see the device chooser.
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If you don't see the device chooser,
we can always click up here.
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And then select Edit Configurations.
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Then, uncheck the Use same device for
future launches check box.
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And click OK.
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Then you'll need to stop the app
running on the current device, and
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then when you run the app again,
we get the device chooser.
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This list shows the device, its name, and
the version of Android that it's running.
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Now select the device you connected, for
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me it's this one, and
click OK to launch the app.
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Then if you see a warning
about Instant Run,
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just click Proceed without Instant Run.
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Once the app loads, we should see
some information here in Logcat.
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And if we look to the top left, we can
see that it's running on our device.
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We can also click over to this Run tab,
and
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we can see information about how
the app was loaded onto the device.
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If there were any problems,
you may see errors here or on the Logcat.
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The app should start
automatically on the phone.
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And success!
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Now you can show off your app
to your friends and family.
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