The following image includes Android code for an app that contains a button with an id : "Downloadbutton". When the app user clicks this button, a progress bar with id: "progressBar" will show up. What will happen if you change *'rate+=10" illustrated with green underlined text to ''rate+=50"?

To add a Google map to an Android app, you should to use map fragments.
What is the main role of adding the following permission tag to AndroidManifest.xml file in an Android app?
The following image displays an AndroidManifest.xml file for an Android app. Which of the following choices is correct about this file?

Which of the following choices is the main role of the Preview button which is illustrated in the red circle of the vertical Android Studio tool bar?
