Android launcher source code

Содержание

How to build a custom launcher in Android Studio — Part One
The game plan
The Android manifest
How to launch apps
How to create an app drawer
The next steps
Android launcher source code
Rootless Pixel Launcher 3.9.1
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Make Your Own Custom Android Launcher using Flutter
Today i am going to discuss about how to nake your Android Launcher !
Lets create a flutter application
Interact with the Applications installed in Phone

How to build a custom launcher in Android Studio — Part One

When it comes to Android customization, the launcher is the holy grail. This is where it’s at. It’s the trump card Android has always had over iOS. It’s what makes Android the most customizable operating system on pretty much any platform.

How might you go about creating your own Android launcher? Read this post — and the upcoming part two — that’s how!

The game plan

Creating an Android launcher is obviously a rather in-depth project with a lot of factors. It is almost always running, so it needs to be as perfectly bug-free as possible.

It would be too large an undertaking to do a completely start-to-finish tutorial here. Instead, I’m going to go over all the crucial features you need to turn any app into a launcher and I’ll leave it to you to put them all together and add your own personal spin. (part two will include the full source for a very basic skeleton of a launcher!)

You’ll need some background knowledge before taking on this project. To that end, I recommend this post on creating your first app from Gary Sims.

What does an app need in order to become a launcher?

It needs to be mapped to the home button and launch when your device starts up.
It needs to display custom wallpapers.
It needs to show and launch apps from the homescreen and from an app drawer.
It needs multiple screens through which you can scroll.
It needs widgets.

There’s more, but if you can get these basics down then you’ll be well on your way. Let’s dive in and get creating out homescreen launcher!

Create a new project with an empty activity and then follow these steps.

The Android manifest

The first item on our agenda is to make our app into a launcher. That means making sure the Android system identifies it as such, loads it up when the system first boots, and shows it whenever you hit the “home” button.

This is simple — you just need to add the following two lines to your Android manifest file inside the activity tag:

Now you’ll have the option to select this application as your launcher. Which technically means it is a launcher.

Right now, it doesn’t look like much of a launcher, and so the next thing to do is add a custom wallpaper. This is also pretty simple. You just have to add the following code to your styles.xml file in the resources folder.

Just a couple of lines added and we’ve got something that looks and behaves like a launcher. I’d say that’s a good start!

How to launch apps

Launching apps is a simple matter of using intents. Intents allow us to launch activities, apps, functions, and more. In this case, we’re going to launch Google Chrome using its package name, which is com.android.chrome.

To do that, you simply need this code:

Remember to import the Intent class (select it and press alt + return when it’s underlined). We could add a button instead of the TextView in our layout XML and set it to launch Chrome. We could also use this as a cool way to easily set any app as our default “home.” Place this in the onCreate method or onResume and any time you press home, you’ll launch Chrome or the app of your choosing!

But that’s probably not what most would want to do. So instead, let’s do the button thing. We’ll use an ImageView and give it the ID chromeButton. Choose any image for now. I picked a star.

Now add an onClick:

Wouldn’t it be nicer if we could use the correct icon? Surprise! we can.

To do this you’ll need to reverse-engineer a handy method to grab the icon from any app and return it as a drawable:

After that, we can simply set the icon as we like it in onCreate():

When using this method, you need both the package name and the activity name. I’m using an app called Package Names Viewer to get these. We’ll get to how to do this dynamically in a moment.

I’ve used a public static method so it’s accessible from other classes without creating multiple instances of our MainActivity. This method will likely prove to be a useful one.

You’ve already built enough of an app here to do something useful. You could very easily create a launcher simply showing your favorite apps in a line, for example. Most people will want to be a little more ambitious.

How to create an app drawer

Now that we can show and launch one app, we should be able to show and launch all apps. We just need to get a list of all the package names on the device, cycle through it, and load the icons into a recycler view.

Create a new activity in your project and call the java and xml files AppsDrawer.java and apps_drawer.xml respectively. Make sure you have some way for the user to launch this second activity too. I added a small menu button at the bottom of the screen.

In here, we’re going to display a list (recycler view) that will simply show all our icons and allow our user to select them in order to launch the app of their choice. Add a recycler view to apps_drawer.xml and give it the ID appsList.

Adding a recycler view is a whole other thing, so I won’t get into that now. Instead, check out this tutorial on recycler views and use the same names for my resource files and views as I did there. There is a method to this madness after all!

Create a separate XML file for the layout of the items in your row, and a new adapter class to populate the recycler view. You also need to create one more class, called appInfo and will have the simplest interface imaginable:

As you might have guessed, we’ll just be using this to store information about the apps in our list.

Now create your adapter class and add the following code:

Remember to import all classes as necessary. Check the comments for a bit more information on what everything does. I highly recommend reading through that Recycler View post if you’re not already familiar.

This is the main unique bit:

This simply loops through our runnable installed apps and grabs the necessary details, icons, and more from there.

Of course, row.xml includes an image view (img) and a text view (textView) which become our icon and our app label.

Meanwhile, the onClickListener added to the view holder allows us to run the app when clicked — just like a real launcher!

The next steps

At this point the end is in sight and you’re getting close to having a fully functional launcher! But there is still a bit left to do.

In part two, we’ll be populating our recycler view in an separate thread to keep things snappy. After that, we’ll add multiple homescreens to swipe through using fragments and take a quick look at how to host widgets.

Stay tuned for part two and be sure to post your questions down below!

Источник

Android launcher source code

This is an open source launcher project for Android devices that has been built completely from scratch. The main goal of this launcher is to find a healthy medium between customization and simplicity. At this point in time it implements most features required in a typical launcher but could benefit greatly from some general polish. If you would like to help out feel free to submit issues or ask about submitting a pull request with a feature you want to see in the launcher.

If your instance is crashing frequently please update the app and reset the data and settings before creating an issue. This project is not actively developed at the moment since all of the main contributors either started working on other projects or find the current state of the launcher sufficient for daily use. If you would like to see a change please realize that it may not get added at all unless someone decides to write the functionality. Pull requests are welcome from anyone! Please ask about large features first, we can help navigate the codebase and talk about where best to add the functionality.

Paged desktop
Dock
Drag and drop
Hide apps
Scrollable background
Search bar
Icon packs

The project is always open for contributions and accepts pull requests. Please use the auto reformat feature in Android Studio before sending a pull request. Translations can be contributed on GitHub. You can use Stringlate to translate the project directly on your Android phone. It allows you to post the translations on GitHub with little effort.

Источник