Team Leader Android Developer Interview Questions And Answers

Activity is to be declared in the manifest file. For example:

☛ <manifest></manifest>
☛ <application></application>
☛ <activity android:name=”.MyIntellipaat”>

The icon for an Activity is defined in the manifest file.

Code
<activity android:icon="@drawable/app_icon" android:name=".MyTestActivity"></activity>
which means you have to Open AndroidManifest.xml.Right under the root “manifest” node of the XML, we can see the “application” node. We have added this attribute to “application”. (The “icon” in “@drawable/icon” refers to the file name of the icon.)
android:icon=”@drawable/icon”

Findviewbyid : Finds a view that was identified by the id attribute from the XML processed inActivity.OnCreate(Bundle).

Syntax

[Android.Runtime.Register("findViewById", "(I)Landroid/view/View;", "GetFindViewById_IHandler")]
public virtual View FindViewById (Int32 id)

Intents are created to define an action that we want to perform and launches the appropriate activity from another application.

Code

Intent intent = new Intent(Intent.ACTION_SEND);intent.putExtra(Intent.EXTRA_EMAIL, recipientArray);

startActivity(intent);

It is connected to either the external world of application or internal world of application, Such as, opening a pdf is an intent and connect to the web browser.etc.

The Service is like as an activity to do background functionalities without UI interaction.

☛ Linux Kernel
☛ Libraries
☛ Android Framework
☛ Android applications.

WebView is UI component that can display either remote web-pages or static HTML

Using with Bundle, we can pass the data to sub activities.

Bundle bun = new Bundle();

bun.putString("EMAIL", "contact@tutorials.com");

A compiled visual resource that can used as a backgrounds,banners, icons,splash screen etc.

Android uses Dalvik Virtual Machine (DVM) which requires a special bytecode. First of all, we have to convert Java class files into Dalvik Executable files using an Android tool called “dx”. In normal circumstances, developers will not be using this tool directly and build tools will care for the generation of DVM compatible files.

There are two types of Intent implicit and explicit intent, let see some more difference between them.

Implicit: Implicit intent is when you call system default intent like send email, send SMS, dial number.

For example,

Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, textMessage);
sendIntent.setType("text/plain")
startactivity(sendIntent);

Explicit: Explicit intent when you call you're on application activity from one activity to another
For example, first activity to second activity:
Intent intent = new Intent(first.this, second.class);
startactivity(intent);

The applications must sign with the same certificate in order to share same Linux user ID and share same VM.

We can use Bundles to pass data to sub-activities. There are like HashMaps that and take trivial data types. These Bundles transport information from one Activity to another

Code

Bundle b=new Bundle();
b.putString(“Email”, “ggl@xyz.com”);
i.putExtras(b); //where I is intent

Every application must have an AndroidManifest.xml file (with precisely that name) in its root directory. The manifest file presents essential information about your app to the Android system, information the system must have before it can run any of the app's code.

ANR stands for application is not responding, basically it is a dialog box that appears when the application is not responding.

The container holds objects,
widgets,
labels,
fields,
icons,
buttons.
etc.

A class which can create only an object, that object can be share able to all other classes.

No, it is not necessary. You can program Android apps can be created using NDK in C/C++. The NDK is a toolset that allows you to implement parts of your app using native-code languages such as C and C++. Typically, good use cases for the NDK are CPU-intensive applications such as game engines, signal processing, and physics simulation.

Android is a stack of software for mobile devices which includes an Operating System, middleware and some key applications. The application executes within its own process and its own instance of Dalvik Virtual Machine.

The Adapter is used to create child views to represent the parent view items.

☛ Positive
☛ Neutral
☛ Negative

Using with intent, we can launch an activity.

Intent intent = new Intent(this, MyTestActivity.class);

startActivity(intent);

FLAG_ACTIVITY_NEW_TASK

FLAG_ACTIVITY_CLEAR_TOP.

Android provides a Unique ID to all applications is called as Linux ID,this ID is used to track each application.