Introduction to sl4 a

Outline Introduction Usage Examples
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INTRODUCTION TO SL4A

louieli yafeilee@qq.com

September 4, 2012

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1 Outline

2 Introduction
Overview of the SL4A
3 Usage
Install
Architecture
usage
Sharing Scripts
4 Examples
download
httpserver
text to speech
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Scripting Layer for Android (SL4A) brings scripting languages to
Android by allowing you to edit and execute scripts and interactive
interpreters directly on the Android device. These scripts have
access to many of the APIs available to full-ﬂedged Android
applications, but with a greatly simpliﬁed interface that makes it
easy to get things done.

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Install

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

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Install

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Architecture

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Architecture

All SL4A API calls return an object with three ﬁelds:
id: a strictly increasing, numeric id associated with the API
call.
result: the return value of the API call, or null if there is no
return value.
error: a description of any error that occurred or null if no
error occurred.

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usage

Python

1 import android
2

3 droid = android.Android()
4 name = droid.getInput(”Hello!”, ”What is your name?”)
5 print name # name is a namedtuple
6 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.new
3 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 android
2 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 python
2 #Launch app.py
3 import subprocess
4 ADB = r’d:Androidandroid−sdkplatform−toolsadb.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 the
script.
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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Sharing Scripts

QR Code

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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 is
only eﬀective for small scripts.

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Sharing Scripts

Scripts as APKs

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

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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 = 100
7 if numblocks != 0:
8 droid.dialogSetMaxProgress(filesize)
9 droid.dialogSetCurrentProgress(numblocks ∗ blocksize)

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download

1 def main():
2 global droid
4 url = ’http://code.jquery.com/jquery−1.8.1.js’
5 if url is None: return
6 dst = droid.dialogGetInput(’Filename’,’Save ﬁle as:’,
7 os.path.basename(url)).result
8 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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download

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httpserver

1 import android, socket, SimpleHTTPServer, struct
2 from os import chdir
3
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” % ipstr
12 SimpleHTTPServer.test()

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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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text to speech

1 import android
3
4 droid.webViewShow(’ﬁle:///sdcard/sl4a/scripts/text to speech.html’)
5 while True:
6 result = droid.eventWaitFor(’say’).result
7 droid.ttsSpeak(result[’data’])
8 print result
9 break

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text to speech

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Introduction to sl4 a

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