Vital Team Leader Android Developer Interview Preparation Guide

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Implicit Intent doesn't specifiy the component. In such case, intent provides information of available components provided by the system that is to be invoked.

Sticky Intent is also a type of intent which allows the communication between a function and a service for example,sendStickyBroadcast() is perform the operations after completion of intent also.

One technique that prevents the Android system from concluding a code that has been responsive for a long period of time is to create a child thread. Within the child thread, most of the actual tasks of the codes can be placed, so that the main thread runs with minimal periods of unresponsive time.

A content provider component supplies data from one application to others on request. Such requests are handled by the methods of the ContentResolver class. A content provider can use different ways to store its data and the data can be stored in a database, in files, or even over a network.

It is not recommended to change the application name after its deployment because this action may break some functionality. For example, shortcuts will not work if you change application name.

Android uses DVM (Dalvik Virtual Machine ) rather using JVM(Java Virtual Machine), if we want, we can get access to .jar file as a library.

Sleep mode mean CPU will be sleeping and it doesn't accept any commands from android device except Radio interface layer and alarm.

Intent filters are filter out the intents.

ANR is short for Application Not Responding. Android systems show this dialog if the application is performing too much of task on the main thread and has been unresponsive from a long time.

Android offers several different options for data persistence. Shared Preferences – Store private primitive data in key-value pairs. This sometimes gets limited as it offers only key-value pairs. You cannot save your own java types. Internal Storage – Store private data on the device memory.

Activity performs actions on the screen.If you want to do any operations, we can do with activity

InflateException, Surface.OutOfResourceException, SurfaceHolder.BadSurfaceTypeException, and WindowManager.BadTokenException

No, Android platform does not support JAR deployments. Applications are packed into Android Package (.apk) using Android Asset Packaging Tool (AAPT) and then deployed onto Android platform. Google provides Android Development Tools for Eclipse that can be used to generate Android Package.

Android is customized Linux 3.6 kernel.

View group is a collection of views and other child views, it is an invisible part and the base class for layouts.

The Android packaging key is compressed with classes, UI's, supportive assets and manifest.All files are compressed to a single file is called APK.

AlertDialog, ProgressDialog,DatePickerDialog, and TimePickerDialog

Use a dynamic broadcast receiver in the activity, and send a broadcast from the service. Once the dynamic receiver is triggered update UI from that receiver.

Drawable is the virtual resource that can be used as a background, title, or in other parts of the screen. It is compiled into an android.graphics.drawable subclass. A Drawable resource is a general concept for a graphic which can be drawn. The simplest case is a graphical file (bitmap), which would be represented in Android via a BitmapDrawable class.
The Drawable is stored as individual files in one of the res/drawable folders. The ADT project creation wizard creates these folders by default. You would store bitmaps for different resolutions in the -mdpi, -hdpi, -xhdpi, -xxhdpi subfolders of res/drawable If these bitmaps are provided in a different folder, the Android system selects the correct one automatically based on the device configuration.

Toast Notification − It will show a pop up message on the surface of the window

Status Bar Notification − It will show notifications on status bar

Dialogue Notification − It is an activity related notification.

It's not truly recommended to change application name after it's deployment, if we change, it will impact on all other internal components.

☛ AndroidManifest.xml
☛ build.xml
☛ bin/
☛ src/
☛ res/
☛ assets/

Android applications has written using the java(Android SDK) and C/C++(Android NDK).

In Android, the action is a description of something that an intent sender desires.
SYNTAX:

CONTAINED IN:
DESCRIPTION:
Adds an action to an intent filter. An element must contain one or more elements. If it doesn’t contain any, no Intent objects will get through the filter.

It is acts as bridge between emulator and IDE, it executes remote shell commands to run applications on an emulator