introduction to sl4 a

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INTRODUCTION TO SL4A

louieli yafeilee@qq.com

September 4, 2012

louieli yafeilee@qq.com

INTRODUCTION TO SL4A

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1 Outline

2 IntroductionOverview of the SL4A

3 UsageInstallArchitectureusageSharing Scripts

4 Examplesdownloadhttpservertext to speech

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INTRODUCTION TO SL4A

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Overview of the SL4A

Scripting Layer for Android (SL4A) brings scripting languages toAndroid by allowing you to edit and execute scripts and interactiveinterpreters directly on the Android device. These scripts haveaccess to many of the APIs available to full-fledged Androidapplications, but with a greatly simplified interface that makes iteasy to get things done.

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INTRODUCTION TO SL4A

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Overview of the SL4A

louieli yafeilee@qq.com

INTRODUCTION TO SL4A

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Install

http://blog.csdn.net/louieuser/article/details/7912661http://blog.csdn.net/louieuser/article/details/7916280

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INTRODUCTION TO SL4A

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Install

louieli yafeilee@qq.com

INTRODUCTION TO SL4A

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Install

louieli yafeilee@qq.com

INTRODUCTION TO SL4A

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Architecture

louieli yafeilee@qq.com

INTRODUCTION TO SL4A

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Architecture

louieli yafeilee@qq.com

INTRODUCTION TO SL4A

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Architecture

louieli yafeilee@qq.com

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Architecture

All SL4A API calls return an object with three fields:

id: a strictly increasing, numeric id associated with the APIcall.

result: the return value of the API call, or null if there is noreturn value.

error: a description of any error that occurred or null if noerror occurred.

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INTRODUCTION TO SL4A

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usage

Python

1 import android2

3 droid = android.Android()4 name = droid.getInput(”Hello!”, ”What is your name?”)5 print name # name is a namedtuple6 droid.makeToast(”Hello, %s” % name.result)

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usage

Lua

1 require ”android”2

3 name = android.getInput(”Hello!”, ”What is your name?”)4 android.printDict(name)5 android.makeToast(”Hello, ” .. name.result)

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usage

Perl

1 use Android;2 my $a = Android−>new();3 $a−>makeToast(”Hello, Android!”);

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usage

JavaScript

1 load(”/sdcard/ase/extras/rhino/android.js”);2 var droid = new Android();3 droid.makeToast(”Hello, Android!”);

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usage

JRuby

1 require ”android”2 droid = Android.new3 droid.makeToast ”Hello, Android!”

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usage

BeanShell

1 source(”/sdcard/ase/extras/bsh/android.bsh”);2 droid = Android();3 droid.call(”makeToast”, ”Hello, Android!”);

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usage

Tcl

1 package require android2 set android [android new]3 set name [$android getInput ”Hello!” ”What is your name?”]4 $android makeToast ”Hello, $name”

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usage

http://code.google.com/p/android-scripting/wiki/ApiReference

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usage

1 #!/usr/bin/env python2 #Launch app.py3 import subprocess4 ADB = r’d:\Android\android−sdk\platform−tools\adb.exe’5 APPLICATION = ’speakit.py’6 TARGET = ’/sdcard/sl4a/scripts/’7

8 def main():9 # Upload the application.

10 subprocess.call([ADB, ’−e’, ’push’, APPLICATION, TARGET + APPLICATION])11 # Launch the application.12 subprocess.call(’”%s” −e shell am start \13 −a com.googlecode.android scripting.action.LAUNCH BACKGROUND SCRIPT \14 −n com.googlecode.android scripting/.activity.ScriptingLayerServiceLauncher \15 −e com.googlecode.android scripting.extra.SCRIPT PATH \16 ”%s%s”’ % (ADB, TARGET, APPLICATION))17

18 if name == ’ main ’:19 main()

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Sharing Scripts

QR Code

1 Open http://zxing.appspot.com/generator/

2 Open the Contents drop down and choose Text.

3 On the first line of the Text Content, enter the name of thescript.

4 Below that, paste the script content.

5 Open the Size drop down and choose L.

6 Click Generate.

7 Embed or share the resulting barcode image with your friends.

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INTRODUCTION TO SL4A

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Sharing Scripts

QR Code

louieli yafeilee@qq.com

INTRODUCTION TO SL4A

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Sharing Scripts

QR Code

To download the script to your phone:

1 Launch SL4A or return the scripts list.

2 Press the Menu button.

3 Tap Add.

4 Tap Scan Barcode.

5 Scan the barcode and SL4A will add the script to your list.

A QR code can encode 4,296 characters of content. So, this isonly effective for small scripts.

louieli yafeilee@qq.com

INTRODUCTION TO SL4A

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Sharing Scripts

Scripts as APKs

https://code.google.com/p/android-scripting/wiki/SharingScripts#Scripts as APKs

louieli yafeilee@qq.com

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download

1 def reporthook(numblocks,blocksize,filesize,url=None):2 base = os.path.basename(url)3 try:4 percent = min((numblocks ∗ blocksize ∗ 100) / filesize, 100)5 except:6 percent = 1007 if numblocks != 0:8 droid.dialogSetMaxProgress(filesize)9 droid.dialogSetCurrentProgress(numblocks ∗ blocksize)

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INTRODUCTION TO SL4A

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download

1 def main():2 global droid3 droid = android.Android()4 url = ’http://code.jquery.com/jquery−1.8.1.js’5 if url is None: return6 dst = droid.dialogGetInput(’Filename’,’Save file as:’,7 os.path.basename(url)).result8 droid.dialogCreateHorizontalProgress(’Downloading...’,9 ’Saving %s from web.’ % dst)

10 droid.dialogShow()11 urllib.urlretrieve(url, downloads + dst,12 lambda nb, bs, fs, url=url: reporthook(nb,bs,fs,url))13 droid.dialogDismiss()14 droid.dialogCreateAlert(’Operation Finished’,15 ’%s has been saved to %s.’ % (url,downloads + dst))16 droid.dialogShow()

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INTRODUCTION TO SL4A

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download

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httpserver

1 import android, socket, SimpleHTTPServer, struct2 from os import chdir3

4 droid = android.Android()5

6 ipdec = droid.wifiGetConnectionInfo().result[’ip address’]7 ipstr = socket.inet ntoa(struct.pack(’L’,ipdec))8

9 chdir(’/sdcard/DCIM/’)10

11 print ”connect to %s” % ipstr12 SimpleHTTPServer.test()

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INTRODUCTION TO SL4A

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text to speech

1 <html>2 <head>3 <title>Text to Speech</title>4 <script>5 var droid = new Android();6 var speak = function() {7 droid.eventPost(”say”, document.getElementById(”say”).value);8 }9 </script>

10 </head>11 <body>12 <form onsubmit=”speak(); return false;”>13 <label for=”say”>What would you like to say?</label>14 <input type=”text” id=”say” />15 <input type=”submit” value=”Speak” />16 </form>17 </body>18 </html>

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INTRODUCTION TO SL4A

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text to speech

1 import android2 droid = android.Android()3

4 droid.webViewShow(’file:///sdcard/sl4a/scripts/text to speech.html’)5 while True:6 result = droid.eventWaitFor(’say’).result7 droid.ttsSpeak(result[’data’])8 print result9 break

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INTRODUCTION TO SL4A

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Examples

text to speech

louieli yafeilee@qq.com

INTRODUCTION TO SL4A