Download Introduction to Android Studio

Android SDK
Download Android Studio from
https://developer.android.com/studio/index.html
File
New
Import
(Folder of Note Project)
Java Class
Xml Layout
Android Manifest
Build.gradle
Basic parts of Android Studio Projects
• Manifext.xml
• Java Code
• XML Layout
Manifest
• Every Android application should contain a manifest file
• It contains
1.
2.
3.
Java Package Name
Components of the app: Activities, Services, Content Providers, Broadcast
Receivers
Permissions for the app
MainActivity.java
package com.example.notetaker;
import android.app.Activity;
import android.os.Bundle;
public class HelloActivity extends Activity {
/* Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
Layout
Two ways to define the UI
• Define the UI elements in XML
• Instantiate the UI elements at runtime
Different Types of Layout
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•
•
•
•
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Linear Layout
Relative Layout
Frame Layout
Table Layout
Absolute Layout
Grid Layout
Linear Layout
• LinearLayout is a view group that aligns all children in a single direction,
vertically or horizontally.
• You can specify the layout direction with the android:orientation
attribute.
Horizontal Layout
Vertical Layout
Relative Layout
• View group that displays child views
in relative positions
• The position of each view can be
specied as relative to sibling
elements (left-of or below another
view)
• Or positions can be specied relative
to the parent RelativeLayout area
(aligned to the bottom, left of
center).
Frame Layout
• Generally meant for holding one child
• Will happily stack up other elements with respect to the parent
container i.e. itself
• Generally used for manipulating the z-index of different elements
(overlay elements)
Table Layout
• Allows you to
define the layout
in terms of rows
and columns like
html
Directory Structrure
manifest The manifest file describes the fundamental characteristics
of the app and defines each of its components
src/ Directory for your app's main source files. By default, it includes
an Activity class that runs when your app is launched
using the app icon.
res/ Contains several sub-directories for app resources.
Here are just a few:
drawable/ A drawable resource is a general concept for a
graphic that can be drawn to the screen
layout/ Files that define your app's user interface.
values/ Directory for other various XML files that contain a
collection of resources, such as string and color
definitions.
Questions ?