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En provenance du cours de The Hong Kong University of Science and Technology

Developing Android Apps with App Inventor

25 notes

The Hong Kong University of Science and Technology

Developing Android Apps with App Inventor

25 notes

The course will give students hands-on experience in developing interesting Android applications. No previous experience in programming is needed, and the course is suitable for students with any level of computing experience. MIT App Inventor will be used in the course. It is a blocks-based programming tool that allows everyone, even novices, to start programming and build fully functional apps for Android devices. Students are encouraged to use their own Android devices for hands-on testing and exploitation.

À partir de la leçon

Device Location

Lost and Found3:35

Rencontrer les enseignants

Kenneth W T Leung
Lecturer
Computer Science and Engineering

[SOUND]

[MUSIC]

Okay, now I'm going to talk about the last application for this course,

which is the lost and found application to show the route from the current location

to some target destination.

[MUSIC]

These are the components that we need for the application.

We need a horizontal division and

inside the division we need a label and two patents.

We name the label as source location and

the patents as use location and use address.

We can use these two patterns to get the current location or

the current address as the source location.

Or we may specify our own source location using a text box.

For these text box, we want the to fill the entire screen.

And then we need another horizontal division for

this horizontal division we need a text box and two buttons.

We can use the text box to label the destination and use these two buttons

to get the current location or the current address as the target destination.

Or we may specify our own destination using a text box.

Again, for this text box, we want the width to fill the entire screen.

Then we need another horizontal division which contains four buttons.

And we use these four buttons to control the web viewer component.

And finally, we need a web viewer component and a location sensor component.

Okay, now, these are the blocks we need for this application.

When we click on the Use Location button, then we

want to use the current location as the soft location or the destination location.

Then we will use the LocationSensor component to check whether we can

get the longitude and latitude parameters from the mobile device.

If we can successfully get the information, then we'll use the current

longitude and latitude as the source location or the destination location.

And we start the longitude and latitude using a text box.

Otherwise, we would just say that we cannot get the current location.

[MUSIC]

And then when we click on the use address button and we want to use

the current address as the source location or the destination location,

then we try to get the current address using location sensor component.

And use the current address as the source location or the destination location.

And then we use this for balance to control the WebViewer component.

When we click on the PreviousButton the NextButton or the HomepageButton

we call the WebViewer component to go back, go forward or go to the homepage.

When we click on the Routes button, we get the soft location and

the destination location from the text boxes and

then create the Google Map route and open it using the Web Viewer component.

[MUSIC]

Okay now, after we enter the soft location and the destination location

using these two text boxes, we can label the destination using this text box.

And once we press on this Route button, we will see the route on Google Map.

And if you want to use the current location or

the current address as the source location or

the destination location, you can just press these buttons here.

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