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Android-Intents-1

Android

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Android-Intents part 1

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Java, JSF 2, PrimeFaces, Servlets, JSP, Ajax, jQuery, Spring, Hibernate, RESTful Web Services, Hadoop, Android.

Developed and taught by well-known author and developer. At public venues or onsite at your location.

Intents, Intent Filters,

and Invoking Activities:

Part I: Using Class Name

Originals of Slides and Source Code for Examples:

http://www.coreservlets.com/android-tutorial/

Customized Java EE Training: http://courses.coreservlets.com/

Java, JSF 2, PrimeFaces, Servlets, JSP, Ajax, jQuery, Spring, Hibernate, RESTful Web Services, Hadoop, Android.

Developed and taught by well-known author and developer. At public venues or onsite at your location.

For live Android training, please see courses

at http://courses.coreservlets.com/.

Taught by the author of Core Servlets and JSP, More

Servlets and JSP, and this Android tutorial. Available at

public venues, or customized versions can be held

on-site at your organization.

• Courses developed and taught by Marty Hall

– JSF 2, PrimeFaces, servlets/JSP, Ajax, jQuery, Android development, Java 6 or 7 programming, custom mix of topics

– Ajax courses can concentrate on 1 library (jQuery, Prototype/Scriptaculous, Ext-JS, Dojo, etc.) or survey several

• Courses developed and taught by coreservlets.com experts (edited by Marty)

– Spring, Hibernate/JPA, EJB3, GWT, Hadoop, SOAP-based and RESTful Web Services

Contact hall@coreservlets.com for details

Topics in This Section

• Part I

– Invoking Activities by class name

– Defining dimensions in res/values

– Sending data via the “extras” Bundle

• Part II

– Invoking Activities with a URI

– Sending data via parameters in the URI

• Part III

– Invoking Activities with tabbed windows

– Defining two-image icons in res/drawable

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Overview

Idea

• Android philosophy

– Activities are small, single-screen units

• Consequence

– You need easy way to switch from one Activity to

another

• Approach: use Intent

– An abstract description of an operation to be performed

– Intent can refer to class name of Activity or a URI

– If a URI, then Activity registers as handler for the

scheme, host name, or MIME type of the URI

– In all cases, new Activity must have entry in

AndroidManifest.xml in order to be invoked

Summary of Options

• Invoke Activity by class name (Part I)

– Exactly one Activity can match

– New Activity must be in same project as original

– Can send data via an “extras” Bundle

• Invoke Activity by URI (Part II)

– More than one Activity could match

– New Activity need not be in the same project as original

– Can send data via URI parameters or “extras” Bundle

• Switch Activities via tabs (Part III)

– Can use class name or URI to specify Activity

– New Activity must be in same project as original

– Can send data via URI parameters or “extras” Bundle

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Example Target Activity:

Loan Payment Calculator

Example Target Activity:

Loan Calculator

• Inputs

– Loan amount

– Interest rate (as a percent)

– Loan period in months

• Outputs

– Monthly payment

– Total payments over life of loan

• Both are in same units

(e.g., dollars) as the loan amount

• Defaults

– Unless values are passed in from other Activity, uses

default values for all inputs

Summary of Layout

TableLayout

Entries in first column

are right-aligned.

Entries in second column are

left-aligned. They are also

given ids so that the Java

code can insert the text.

This is a View with

android:column_span="2"

and a fixed height.

XML: Layout File: First Row

(res/layout/loan_payment.xml)

<?xml version="1.0" encoding="utf-8"?>

<TableLayout xmlns:android="http://..."

android:layout_width="match_parent"

android:layout_height="match_parent"

android:stretchColumns="1">

<TextView android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="@color/default_foreground"

android:textSize="@dimen/font_size"

android:text="@string/loan_amount_prompt"

android:gravity="right"/>

<TextView android:id="@+id/loan_amount"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="@color/default_foreground"

android:textSize="@dimen/font_size"

android:gravity="left"/>

</TableRow>

Second and third rows are very similar. Bottom two rows are almost the same except for a different textColor for the second column.

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