google maps api

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Google Maps API

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Google Maps on Android

A nice API for mapping applications

Pre-reqs

Need to have the Google API added in Eclipse’s Android Manager

Make sure your build target and Android Virtual Device (AVD, or the simulator) support the maps

More info:

http://developer.android.com/resources/tutorials/views/hello-mapview.html

Add the MapView

In the res/layout/main.xml file: Add your MapView

Details in the Tutorial

http://developer.android.com/resources/tutorials/views/hello-mapview.html

You will need a Google Maps API Key

It’s free - you can register with the SDK debug certificate. When deploying your app for real, you’ll need a

real certificate

http://code.google.com/android/add-ons/google-apis/mapkey.html

Using the Map Controller

Using the Map is easy… MapController myMC =

myMapView.getController();

myMC.setZoom(17); // set the zoom level myMapView.setSatellite(); // sets sat view

Map Control

You can zoom, set points, routes, etc.

Adding overlays allows you to note all places of interest from a list

Overlays are discussed in the tutorial http://

developer.android.com/resources/tutorials/views/hello-mapview.html

Intents

Intents allow you to pass a message Within your app To existing resources on the phone, such as the dialer

To launch the dialer… To load another activity in your app… You can also create custom intents…

Launch another Activity

Intent intent = new Intent(FirstActivity.this, AnotherActivity.class); startActivity(intent);

This will launch another activity (screen) without destroying the first

ExampleIntent I = new Intent(Intent.ACTION_DIAL, Uri.parse(“tel:647-722-3888”));

startActivity(i);

Launch Google MapsString uri = “geo:37.523156,-121.084917”

Intent myIntent = New Intent(android.content.Intent.ACTION_VIEW, Uri.parse(uri));

startActivity(myIntent);

Intents can

Return a result. startActivityForResult();

Be filtered by your app so that you can respond to certain intents.

Create your own and respond to them

Android Intent Docs

http://developer.android.com/guide/topics/intents/intents-filters.html

Files and Storage on Android Devices

Storage

Four basic ways

Shared Preferences Database Files on the Device The “cloud”

http://developer.android.com/guide/topics/data/data-storage.html

Shared Preferences

Easy, built in way to save preferences to the device App settings, Similar to the Windows registry SharedPreferences class in the API

SharedPreferences Example SharedPreferences settings =

getSharedPreferences(PREFS_NAME, default_value);

boolean value = settings.getBoolean(“prefName", default_value);

Database

Local database on the device SQLite For heavier-duty data requirements / queries

db.execSQL(“SELECT * …”);

Can store data to a file Useful for saving media files, save games,

etc. Just like writing files in Java

FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);

fos.write(string.getBytes());

fos.close();

Saving to the Network Persistent storage, but… A network connection

may not always be available

May have to create your own server

android.net libraries stream to a network connection

Amazon AWS

Allows you to save data to Amazon servers

An API for Android

http://aws.amazon.com/

OpenFeint & Scoreloop

A nice resource for games Allows you to easily save high scores and

achievements Creates leaderboards, friend lists, etc.

www.OpenFeint.com www.ScoreLoop.com

Broadcast Receivers

These allow you to ‘intercept’ messages That you create, or… That the system sends

The coolest part

The user doesn’t need to start your app

If your receiver listens for the specific Intent that fired, that code will run

Or you can decide when a receiver is active through registering / deregistering

2 ways to create

In xml <receiver> tag in AndroidManifest.xml

In Code Context.registerReceiver(); Gives more control, but not active until your app

has run

Then…

Just fill in the onReceive() method.

This is the code that “handles” the event

Some System Intents

ACTION_TIME_TICK A minute has passed

ACTION_BATTERY_LOW Need to plug it in!

SMS_RECEIVED You got a text!

Android BR Docs

http://developer.android.com/reference/android/content/BroadcastReceiver.html

Android Databases

Databases

Android uses the SQLite Database

A lightweight database server

Returns the Android ‘Cursor’ instead of rows – for efficiency.

Basics

It’s useful to create a “Helper” class to simplify database interactions

Methods will include: getRecord(long rowIndex) to return a specific

record getAllRecords() to return a Cursor

SQLiteOpenHelper

Your helper class can also extend the SQLiteOpenHelper abstract class

To simplify creating and opening databases

Cursors

Instead of returning rows, you get a Cursor to manage the results of a query

Cursor myResult = myDB.query (…);

myResult.getString(columnIndex);

Notepad Tutorial

Great tutorial for database concepts

Includes: Integrating the ListView with a DB ->

http://developer.android.com/resources/tutorials/notepad/index.html

Publishing Your Apps

Signing

This is required to release your application

Several Steps…

The tutorial http://developer.android.com/guide/publishing/app-signing.html

The device will only run signed apps

You can issue your own certificate, or use the developer certificate for testing

To release, you must have a certificate with a 20+ year expiration date

Eclipse

Right-click on the project Android Tools -> Export Signed Application This creates the .apk You can then load it to a web server

Device

Make sure your device allows apps that are not from the app store

In configuration menu

Testing… Very important!

Test on several devices Screen resolutions No network connectivity Orientation Interruption from calls GPS if applicable

The simulator is usually a best-case scenario!

Simulator

Test on all available AVD versions

Specify the <uses-sdk> parameter in the manifest, and test on all devices after that version

Simulator

In Eclipse’s Run->Run Configuration Specify Network speed and latency to test

under varying conditions Test on a real device also

Once fully tested

Submit to the Android Marketplace

Should obfuscate source code Harder to reverse engineer Proguard does the trick

Enabled in eclipse – your app will have a proguard.cfg file

Submission

Google charges $25 to register You may then submit as many apps as you

like Activation in the Google marketplace is

almost instantaneous

Amazon AppStore takes 2-3 weeks for approval

Proguard Documentation

http://developer.android.com/guide/developing/tools/proguard.html

Shrinks, optimizes, and obfuscates the code

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