Another important tool in our arsenal is the Android Device Monitor.

From the Android Device Monitor, we can take screenshots, spoof incoming calls and

texts, spoof location data and much more.

And actually, ever since Android Studio 2.0,

a lot of these functionality can be done right from the emulator.

But there's still a few good reasons to use the Android Device Monitor.

To open it click on Tools > Android > Android Device Monitor.

Once it's open, we can click on our device on the side bar on the left to select it,

but for now let's leave this behind and jump back to the emulator.

One of the cool things we can do from here is, send fake phone calls and

text messages to our virtual device.

Testing how an app responds to incoming phone calls and

text messages, is an important part of the testing process.

You wouldn't want your music player to keep playing during a phone call.

So if we click over here on the three dots, and then click on phone,

we can type in an arbitrary number, Like 123456789 and

then send this text message to our device.

Look I got a text.

Cool, and if you wanted to call the device with that number,

you just click the call device button.

Hey, now's not really a good time for a phone call.

Another cool thing we can do from here is set the location of our virtual device

by specifying a latitude and longitude.

An easy way to get latitude and longitude information is by using Google Maps.

Just find a location you're interested in, let's say Tokyo,

Then right click on the map and select what's here,

to have Google Maps show you the coordinates.

Now you can copy and paste in the first coordinate, As the latitude,

On the location tab, And

copy and paste in the second coordinate as the longitude.

Then when you hit send, Android will start to think your device is in Tokyo.

To check this, all we need to do, is go home and since for our virtual device we

decided to include the Google APIs, we can just click in here, go to Google Maps,

And click on the Where am I button.

And awesome, it thinks we're in Tokyo.

Another thing you might wanna change while your app is running,

is the network speed and latency.

We saw earlier how we can set these as properties of our virtual device.

But changing them from in here, on the Cellular tab,

let us modify the network speed and latency in real time.

Let's test it out.

I'm going to go to Google Images,

And look up pictures of alpaca,

Looks like that loaded pretty quickly.

Now let's change the speed of our network to EDGE,

which is a little slower than 3G, and refresh the page.

Wow, this is taking a lot longer to load.

Being able to change network settings on the fly is a useful feature for

making sure an app handles network transitions gracefully.

And being able to test your app on a really slow network is a great way to see

what some of your users might be dealing with.

While this keeps loading, another useful thing we can do right from the emulator,

is take screenshots.

This can be useful for gathering screenshots on many different types

of device to use in a listing on the Google Play Store.

We can take a screen shot by clicking on the camera icon over here.

Also, taking a screenshot might take a few seconds.

That's because it takes the screenshot at the full resolution of your

virtual device.

Just like if you were taking a screen shot on an actual device.

Also, the screenshots should be stored on your computer.

For me on a Mac, it puts it in the Desktop folder.

Getting back to the Android Device Monitor, one thing we still can't do

directly from the emulator is manage the files on our virtual device.

Let's click on the file explorer tab, to see what we can do.

On the top right, we have options to pull files from the device to our computer,

push files from our computer to the device, delete files and add new folders.

I really like that picture I took in the last video.

Let's see how I would pull onto my computer.

Start by expanding the storage folder, and then emulated, and then zero.

And let me give a little more room to this name column.

These should be the folders you're familiar with seeing if you've ever used

a File Explorer on your Android device.

And to find that picture I took with the camera,

we just need to go into the DCIM folder and then the camera folder.

Then I'll highlight my file and

click to pull it from the device to my computer.

And that's a fine place to put it.

And now, it's on my computer.

Hopefully, you now have a better idea of how to make the most

of the Android emulator.

It really is a powerful tool for thoroughly testing your apps.