Java supports many different types of Lists, but we’ll just use ArrayList. For more information, see the Activities guide. Your activity receives the result as a separate Intent object in your activity's onActivityResult () callback. If you want to receive a result from the activity when it finishes, call startActivityForResult (). We can create a List object with List values = new ArrayList(), specifying that the type of data it will hold is String. The Intent describes the activity to start and carries any necessary data.We can initialize and change variables, have conditions, arrays, for loops, Lists (like a dynamically-sized array), We’ll take a look at the syntax for Java, which is similar to C and has familiar data types.We’ll want to first create an AVD, or Android Virtual Device, so we can run our app on our laptop instead of a separate device. The first action that specifies the Android intent is Intent.ACTIONDIAL, which is another built-in action of the Android system. Inside Android Studio we’ll see a lot of files that have been generated for us.We’ll use Java and support Android 5.0 or above, so most devices can use our app. A convention for the package name is the domain name in reverse, plus the app name, like. We’ll select the Empty Activity template for our app, and use JavaExample for our app name. We’ll download and open it, and start a new project. We’ll use Android Studio, an IDE provided by Google to help us write Android apps.We’ll learn to write mobile apps for Android with a new language, Java, and build three apps: one that loads data and displays it one that applies filters to images one that lets you take notes and save them.
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Not sure you’ll finish the course by then? How to Do It Introduction Though CS50x’s deadline has already been extended to 31 December 2021, this version of this problem set will only be accepted until the date and time above.