Android studio hello world project download

Paging 2. Data layer libraries. How-To Guides. Advanced Concepts. Threading in WorkManager. App entry points. App shortcuts. App navigation. Navigation component. App links. Dependency injection. Core topics. App compatibility. Interact with other apps. Package visibility. Intents and intent filters. User interface. Add motion to your layout with MotionLayout. MotionLayout XML reference.

Improving layout performance. Custom view components. Look and feel. Splash screens. Add the app bar. Control the system UI visibility. Supporting swipe-to-refresh. Pop-up messages overview. Adding search functionality. Creating backward-compatible UIs.

Home channels for mobile apps. App widgets. Media app architecture. Building an audio app. Building a video app. The Google Assistant. Routing between devices. Background tasks. Manage device awake state. Save to shared storage. Save data in a local database. Sharing simple data. Sharing files. Sharing files with NFC.

Printing files. Content providers. Autofill framework. Contacts provider. Data backup. Remember and authenticate users. User location. Using touch gestures. Handling keyboard input. Supporting game controllers. Input method editors. Performing network operations. Transmit network data using Volley. Perform network operations using Cronet. Transferring data without draining the battery.

Reduce network battery drain. Transfer data using Sync Adapters. Bluetooth Low Energy. Wi-Fi infrastructure. Discover and connect. Your 15 seconds will encourage us to work even harder Please share your happy experience on Google Facebook. Tags: android hello world Android hello world program android studio hello world hello world program in android studio. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

Skip to content Android Projects 0. Java: Java is the other important thing that you must know as Java will be used throughout our journey of Android Studio. It will let us do the designing of the layout of the application or project that we make. Android Hello World Program Our first android project is a very simple application that is especially for the beginner, to begin with. It is located in the Resource folder within the layout directory. It helps us create and develop the interface of the application and design it using User Interface components.

It manages all the functionalities of the applications as well as the methods and the packages required. Note: The root element of android Layout resource file must have the android namespace declaration. Now, you have a TextView on the screen. If you want to add other elements, you can do it but in this article I will focus on the TextView. The picture shows the margin, padding, and content area.

The margin is the picture represent by the orange color, it is the View outside area that act as the gap between View s. The yellow one is padding, the area that not allow to place any content.

On the center, it is the content display area if the content area is larger than it content, you will see that the content is alway place on the top left except you have set the android:gravity property. Now, The Hello Android application is completed. But we will learn more about some simple Resource s. The Resource Type that provides static text strings, plural string, and string array. Android recommend you to use the string resources instread the hard code string. By deafult when you create the project, string.

Open string. Now, open you MainActivity layout file and try to use the string resources instread the hard code string. You will see the result in the preview screen or the Design View.

To make sure that your project is work properly, run the application on your device or emulator. For the support language list you can find that from this Stack Overflow Thread. Note: Must use the same string name with string resources in values directory.

Note: The string that has no translation will display as it original string from values directory. Note: When you sign an Application for distribution the error will throws if some string have no translation.

You need to translate all strings to the language that you want to support. The application name under the icon will change too. Like the string value, you can create it as resources too. Note: All of value resources can be put in one file because it has same structure but I recommend you to create a file separately for easy to manage inthe future.

To sizie and position the View you can use a static value in dp, sp, px units, we will make it as a resource too. When you make dimension value as resources, you can edit a value in one place and affect to all View that use this resource. In the APK packaging process your application contents will sign with the private key. You will can't install your application if it not signed.

KeyStore is a repository of security certificates, Android use it to store certificates keys. The keystore file is unique that meant it impossible to create a same keystore if it lost and you will can't update your application. When you deploy the Debug APK to device from one PC and then you re-deploy the application from another PC, Android tell you to uninstall an old one before install again becuase it think that 2 Debug APKs are come from different owner and they are different application.

When you want to distribute your appliacation you need to sign you application with your own private key not a debug key. You will see that the wizard will fill your keystore and alias automatically and there is an option to remember a password, however you need to remember the keystore information by yourself. You can select an Signed APK destination folder if it not exist, create it by yourself , and the Build type by default there are release and debug options.

Select "release" if your want to distribute. Then click the "Finish" button. The APK signing result will show on the status bar and its build message will show on the "0: Message" tab. Note: KeyStore file can contains one more more alias but I recommend you to create only one alias for one KeyStore. Note: The alias is an actual certificate.

You need to use only one alias to sign the application, if you sign the application with different alias you will can't update your application.

Richard MacCutchan ask me that he can't run the application and got the error message:. This error message is interesting because it is not a programer fault but it is an Android compatibility issue, when you try to build the app with target to the Android 4. I ask him to set the compileSdkVersion and targetSdkVersion to 19 or below and test again. And he tell me it work properly.