Deck 1 Flashcards
1) What is Android?
// https://www.guru99.com/android-interview-questions.html
It is an open source linux-based operating system, that is used primarily on mobile devices, such as cell phones and tablets.
2) What Is the Google Android SDK?
The Google Android SDK is a toolset that developers need in order to write apps on Android enabled devices.
(or)
The Android SDK is a software development kit that includes a comprehensive set of development tools.
These include a debugger, libraries, a handset emulator based on QEMU, documentation, sample code, and tutorials.
3) What is the Android Architecture?
Android Architecture is made up of 4 key components:-
1.Linux Kernel
2.Libraries
3.Applications Framework
4.Android Applications
4) Describe the Application Framework.
(Android architecture)
The Android Framework -Here you can find all the classes and methods that developers would need in order to write applications on the Android environment.
22) What is the importance of settings permissions in app development?
Permissions allow certain restrictions to be imposed primarily to protect data and code. Without these, codes could be compromised, resulting to defects in functionality.
20) Which elements can occur only once and must be present?
Among all elements the “manifest” and “application” and different elements, only the and elements are required.
They each must occur only once. Most of the other elements can occur zero or more times.
Wheras the rest of them are optional, and can occur as many times as needed.
21) How are escape characters used as attribute?
Escape characters are preceded by double backslashes. For example, a newline character is created using ‘\n’
12) What is the importance of XML-based layouts?
The use of XML-based layouts provides a consistent and somewhat standard means of setting GUI definition format. In common practice, layout details are placed in XML files while other items are placed in source files.
13) What are containers?
Containers, as the name itself implies, holds objects and widgets together, depending on which specific items are needed and in what particular arrangement that is wanted. Containers may hold labels, fields, buttons, or even child containers, as examples.
14) What is Orientation?
Orientation, which can be set using setOrientation(), dictates if the LinearLayout is represented as a row or as a column. Values are set as either HORIZONTAL or VERTICAL.
15) What is the importance of Android in the mobile market?
Developers can write and register apps that will specifically run under the Android environment. This means that every mobile device that is Android enabled will be able to support and run these apps. With the growing popularity of Android mobile devices, developers can take advantage of this trend by creating and uploading their apps on the Android Market for distribution to anyone who wants to download it.
16) What do you think are some disadvantages of Android?
Given that Android is an open-source platform, and the fact that different Android operating systems have been released on different mobile devices, there’s no clear cut policy to how applications can adapt with various OS versions and upgrades. One app that runs on this particular version of Android OS may or may not run on another version. Another disadvantage is that since mobile devices such as phones and tabs come in different sizes and forms, it poses a challenge for developers to create apps that can adjust correctly to the right screen size and other varying features and specs.
17) What is adb?
Adb is short for Android Debug Bridge. It allows developers the power to execute remote shell commands. Its basic function is to allow and control communication towards and from the emulator port.
18) What are the four essential states of an activity?
Active – if the activity is at the foreground
Paused – if the activity is at the background and still visible
Stopped – if the activity is not visible and therefore is hidden or obscured by another activity
Destroyed – when the activity process is killed or completed terminated
19) What is ANR?
ANR is short for Application Not Responding. This is actually a dialog that appears to the user whenever an application have been unresponsive for a long period of time.
20) Which elements can occur only once and must be present?
Among the different elements, the and elements must be present and can occur only once. The rest are optional, and can occur as many times as needed.
21) How are escape characters used as attribute?
Escape characters are preceded by double backslashes. For example, a newline character is created using ‘\n’
22) What is the importance of settings permissions in app development?
Permissions allow certain restrictions to be imposed primarily to protect data and code. Without these, codes could be compromised, resulting to defects in functionality.
23) What is the function of an intent filter?
Because every component needs to indicate which intents they can respond to, intent filters are used to filter out intents that these components are willing to receive. One or more intent filters are possible, depending on the services and activities that is going to make use of it.
24) Enumerate the three key loops when monitoring an activity
Entire lifetime – activity happens between onCreate and onDestroy
Visible lifetime – activity happens between onStart and onStop
Foreground lifetime – activity happens between onResume and onPause
