Open the Android Studio and select "Start a new Android Studio project".
The first step to implement the app is to create an Android project:
Figure 1: Activities implemented by the Hello World app. When the user types a string in the textbox and presses the button, the right-hand side activity is created, echoing the input string back to the user. The left-hand side activity is shown when the app is started, and displays a textbox and a "Send" button. Implement a Hello World application which renders the two activities shown in Figure 1.
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