Android Training Session 1

Android Application
Fundamentals
• Basic Java Programming Language
• Basic Knowledge about XML

App Components
• Activities
• Services
• Content Providers
• Broadcast Receivers
• Intents and Intents Filters

Broadcast Receivers
& Content Providers

Intents and Intent Filters
• An Intent is a messaging object you can use to
request an action from another app component.
• Intent Types: 1. Explicit Intent 2. Implicit Intent
1. Explicit Intent: specify the component to start by
name (the fully-qualified class name). You'll typically
use an explicit intent to start a component in your
own app, because you know the class name of the
activity or service you want to start. For example,
start a new activity in response to a user action or
start a service to download a file in the background.

2. Implicit intents do not name a specific component, but instead declare a
general action to perform, which allows a component from another app to
handle it. For example, if you want to show the user a location on a map,
you can use an implicit intent to request that another capable app show a
specified location on a map.
Intent Filters:
<intent-filter>
<action android:name="android.intent.action.SEND"/>
<category android:name="android.intent.category.DEFAULT"/>
<data android:mimeType="text/plain"/>
</intent-filter>
Ex:
<data android:mimeType="application/vnd.google.panorama360+jpg"/>
<data android:mimeType="image/*"/>
<data android:mimeType="video/*"/>

Application Permission
• Requests a permission that the application must be
granted in order for it to operate correctly. Permissions
are granted by the user when the application is installed,
not while it's running
1. android.permission.CALL_EMERGENCY_NUMBERS
2. android.permission.READ_OWNER_DATA
3. android.permission.SET_WALLPAPER
4. android.permission.DEVICE_POWER
5. android.hardware.bluetooth

Views, Layouts and UI
Components
• Provides classes that expose basic user interface classes
that handle screen layout and interaction with the user
• Layouts:

UI Components
• Input Controls

Menu & Action bar
Android Version before 3.0

List view and Grid View
• Android List View is a view which groups several items and
display them in vertical scrollable list. The list items are
automatically inserted to the list using an Adapter that pulls
content from a source such as an array or database.
• An adapter actually bridges between UI components and the
data source that fill data into UI Component. Adapter can be
used to supply the data to like spinner, list view, grid view etc.
• The List View and Grid View are subclasses of Adapter View and
they can be populated by binding them to an Adapter, which
retrieves data from an external source and creates a View that
represents each data entry. Android provides several subclasses
of Adapter that are useful for retrieving different kinds of data and
building views for an Adapter View

Example:
String[] countryArray = {"India", "Pakistan", "USA",
"UK"};
ArrayAdapter adapter = new ArrayAdapter<String>(this, R.layout.ListView,
StringArray);
ListView listView = (ListView)
findViewById(R.id.listview);
listView.setAdapter(adapter);

Grid View
• Android GridView shows items in two-dimensional scrolling
grid (rows & columns) and the grid items are not
necessarily predetermined but they automatically inserted
to the layout using a ListAdapter
• An adapter actually bridges between UI components and
the data source that fill data into UI Component. Adapter
can be used to supply the data to like spinner, list view,
grid view etc.
• The ListView and GridView are subclasses of AdapterView
and they can be populated by binding them to an Adapter,
which retrieves data from an external source and creates a
View that represents each data entry.

public Integer[] mThumbIds = {
R.drawable.sample_2, R.drawable.sample_3,
R.drawable.sample_6, R.drawable.sample_7
};
public View getView(int position, View convertView, ViewGroup parent)
{
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(mContext);
imageView.setLayoutParams(new
GridView.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENT
ER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else { imageView = (ImageView) convertView; }
imageView.setImageResource(mThumbIds[position]);
return imageView;
}

Tab layout & Swiper Views
• TabLayout provides a horizontal layout to display tabs

Swipe views
• Efficient navigation is one of the cornerstones of a well-
designed app.

Adding Styles and
Themes
• A style is a collection of properties that specify the look and
format for a view or window. A style can specify properties
such as height, padding, font color, font size, background
color, and much more. A style is defined in an XML resource
that is separate from the XML that specifies the layout.
Ex:
<TextView
style="@style/CodeFont"
android:text="@string/hello" />

Android Training Session 1

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Android Training Session 1