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Android programming is growing day by day. The questions asked by interviewers in android is given below. A list of top android interview questions and answers:
Android is an open-source, Linux-based operating system used in mobiles, tablets, televisions, etc.
Andy Rubin.
Following is a list of components of Android application architecture:
Open-source: It means no license, distribution and development fee.
Platform-independent: It supports Windows, Mac, and Linux platforms.
Supports various technologies: It supports camera, Bluetooth, wifi, speech, EDGE etc. technologies.
Highly optimized Virtual Machine: Android uses a highly optimized virtual machine for mobile devices, called DVM (Dalvik Virtual Machine).
Yes, an android app can be developed in C/C++ also using android NDK (Native Development Kit). It makes the performance faster. It should be used with Android SDK.
The core building blocks of Android are:
Activity is like a frame or window in java that represents GUI. It represents one screen of android.
There are 7 life-cycle methods of activity. They are as follows:
It is a kind of message or information that is passed to the components. It is used to launch an activity, display a web page, send SMS, send email, etc. There are two types of intents in android:
View elements can be identified using the keyword findViewById.
An android toast provides feedback to the users about the operation being performed by them. It displays the message regarding the status of operation initiated by the user.
The following folders are declared as impotent in android:
We use bundles to pass the required data to various subfolders.
The files which can be injected for the building up of a process are called as application resource file.
A unique Linux ID is assigned to each application in android. It is used for the tracking of a process.
No
The various storage provided by android are:
Layouts in Android are placed as XML files.
Layouts in Android are placed in the layout folder.
The Implicit intent is used to invoke the system components.
An explicit intent is used to invoke the activity class.
A service is a component that runs in the background. It is used to play music, handle network transaction, etc.
SQLite: An opensource and lightweight relational database for mobile devices.
AAPT is an acronym for android asset packaging tool. It handles the packaging process.
A content provider is used to share information between Android applications.
The fragment is a part of Activity by which we can display multiple screens on one activity.
ADB stands for Android Debug Bridge. It is a command line tool that is used to communicate with the emulator instance.
NDK stands for Native Development Kit. By using NDK, you can develop a part of an app using native language such as C/C++ to boost the performance.
ANR stands for Application Not Responding. It is a dialog box that appears if the application is no longer responding.
The Google Android SDK is a toolset which is used by developers to write apps on Android-enabled devices. It contains a graphical interface that emulates an Android-driven handheld environment and allows them to test and debug their codes.
APK is a short form stands for Android Packaging Key. It is a compressed key with classes, UI's, supportive assets and manifest. All files are compressed to a single file is called APK.
Android applications are written by using the java (Android SDK) and C/C++ (Android NDK).
ADT stands for Android Development Tool. It is used to develop the applications and test the applications.
View Group is a collection of views and other child views. It is an invisible part and the base class for layouts.
An adapter is used to create a child view to present the parent view items.
We can change bitmap images into nine sections with four corners, four edges, and an axis.
Android is a customized Linux 3.6 kernel.
Application widgets are miniature application views that can be embedded in other applications and receive periodic updates.
Following are two types of flags to run an application in Android:
A singleton class is a class which can create only an object that can be shared by all other classes.
In sleep mode, CPU is slept and doesn't accept any commands from android device except Radio interface layer and alarm.
In Android, a drawable folder is compiled a visual resource that can use as a background, banners, icons, splash screen, etc.
DDMS stands for Dalvik Debug Monitor Server. It gives the wide array of debugging features:
The Android architecture consists of 4 components:
The portable wi-fi hotspot is used to share internet connection to other wireless devices.
Fri, 16 Jun 2023
Fri, 16 Jun 2023
Fri, 16 Jun 2023
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