Name: 開發了我的第一款安卓應用 (Developed My FIRST Android App)
Uploaded: 2021-01-14T10:23:36.000Z
Duration: 7 min 24 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

現在進行式

what is up, guys First here and today We're gonna be discussing my very first enjoyed application when that's a little bit more than just a hello world application.

委婉語氣表達希望、渴望

But less than anything that would be like appropriate to put on the APP store.

基礎數量詞

But before warned, this is a continuation of my last video where I had so much video content.

That powder is one video that I separated it into last video and into this video where we discuss that of my first real android application.

All right, so now they have everything open and running over here on the emulator.

So I'm gonna preface this by saying I am no enjoy professional few.

This is essentially my first enjoyed application.

So if anything's wrong, well, I'm sure my professor will tell me, but I am open to you, letting me know what could be better.

So over here we have our boilerplate code.

This is what was included upon creation of this enjoyed project.

And then I added in the relative layout, in order to get everything aligned properly, that is my list of you.

You can see where that is using this box over here, the edit text.

So I used relatively out in order to use something like this, where I have lay out a line parent top and lay out a line parent left that aligns this that is boxed up into the top and into the left.

Sure, but I feel like it's necessary to mention that also, from my understanding, it is important to include the top in the left, as opposed to only the lay out a line.

Parents start like I have down here because what I have highlighted this start is good.

That is what you want to use on newer versions of injured, uh, enjoy devices.

However, the top in the left those air still implemented or thio allow your application to work on order versions of Android and with the start does essentially it starts the alignment of the list view to its parent, which is the sense in the background of this whole application.

And if you want to give an opposite example of that, I have laid out a lion parent end for the ad item that is highlighted.

So it is at the end of that background part.

And sure, I still have lay out a line parent right and lay out a line parent bottom in order to align it down here on order Android devices And a lot of this is standard.

But also something I want to point out is down here.

I have Android on Click on Add Item, and that is essentially when I click.

It will implement my function on ad item where that's kind of self explanatory.

Let me come over here to the emulator and just type in.

I could type in use my keyboard or this keyboard, and then this is one.

At item occurs when I click at item and adds the item on to my list view self explanatory again.

But this is helping me remember everything.

And now that I have my emulator running because I had update the emulator so it wasn't running earlier, I can actually show you guys what What's going on with the code?

Because I have read items in here and set up a list of you listener.

So basically, when I opened up my application after closing it, it doesn't delete all of my daddy because everything gets written to a file and read to a file, which is the list view.

So essentially, the list view gets written to to do dot text and upon reopening the application, it essentially, like, basically rewrites the list view to the application.

I mean, that's like the best way for me to explain it.

And then we've already discussed on ad item.

I have set up list view listener and also have this function running in on create because this the one create needs to adjust.

Whenever I used this function because let me show you what this function does.

Basically, when I'm over here, let me drop the keyboard just because And I long click on one of my items, it deletes and that is how you do it.

One of the items along click Hold it down.

A regular click does nothing He is, you see, But long click will delete whatever you know, Adam, I'm clicking on obviously and that is what this function does right here.

So basically what I have in my main activity that Java file is everything I needed for, you know, to get a good grade on my project from my injury development class.

So I didn't need to make a pretty Oh, Another thing that actually needed to do is the way this, like generic title comes up top.

I figured I could come into here coming to the design and do something like, you know, double click on this.

Maybe there is an easier way to do it because this said to do as one word underscore list, because that's how I saved it.

But instead I had to come over here, I think, to yeah, AP rez values and then streams and change it right here.

So if I change this Thio to do without the space and I come back over to my far right here, it closes that gap.

But I went toe open it back up just because that's how I had it.

So a little little Maybe it's just me, but it's a little interesting that something kind of like seems that defaults onto my screen.

I can delete it all that stuff using this file.

But it's interesting to me how that's the way I need to change it.

Although I have this storyboard like layout right here in front of me, I figured I could just double click on it and change what it says.

No, no, I could do that right here, worth with the text.

You or I could just, you know, add that in on on here.

And that's how I thought the generic title would kind of react upon double clicking.

It's something that I had only three hours to complete a CZ you may know from last video.

Luckily enough, is computer science offer developer type people?

We know how to use whatever resource is to our advantage.

So I used the Internet and all of that has to offer to my advantage to get this done because I'll set at such a time constraint.

If you really don't know what I'm talking about, go watch my last video.

It's called bad a bad day as a computer science student for a reason.

Oh yeah, And I'm also in the works of making another small Injun application for the same class, which I will be making a video about here in the next week or two.

 So if you like these types of videos and you want to see what I have coming next, don't forget to subscribe. 

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開發了我的第一款安卓應用 (Developed My FIRST Android App)

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