1. Outline Introduction Usage Examples
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INTRODUCTION TO SL4A
louieli yafeilee@qq.com
September 4, 2012
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

2. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

3. Outline Introduction Usage Examples
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Overview of the SL4A
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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

4. Outline Introduction Usage Examples
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Overview of the SL4A
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

5. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

6. Outline Introduction Usage Examples
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Install
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

7. Outline Introduction Usage Examples
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Install
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

8. Outline Introduction Usage Examples
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Architecture
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

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Architecture
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

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Architecture
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

11. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

12. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

13. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

14. Outline Introduction Usage Examples
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usage
Perl
1 use Android;
2 my $a = Android−>new();
3 $a−>makeToast(”Hello, Android!”);
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

15. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

16. Outline Introduction Usage Examples
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usage
JRuby
1 require ”android”
2 droid = Android.new
3 droid.makeToast ”Hello, Android!”
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

17. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

18. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

19. Outline Introduction Usage Examples
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usage
http://code.google.com/p/android-scripting/wiki/ApiReference
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

20. Outline Introduction Usage Examples
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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() . . . . . .
louieli yafeilee@qq.com
INTRODUCTION TO SL4A

21. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

22. Outline Introduction Usage Examples
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Sharing Scripts
QR Code
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

23. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

24. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

25. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

26. Outline Introduction Usage Examples
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download
1 def main():
2 global droid
3 droid = android.Android()
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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

27. Outline Introduction Usage Examples
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download
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

28. Outline Introduction Usage Examples
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httpserver
1 import android, socket, SimpleHTTPServer, struct
2 from os import chdir
3
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” % ipstr
12 SimpleHTTPServer.test()
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

29. Outline Introduction Usage Examples
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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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

30. Outline Introduction Usage Examples
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text to speech
1 import android
2 droid = android.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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louieli yafeilee@qq.com
INTRODUCTION TO SL4A

31. Outline Introduction Usage Examples
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text to speech
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louieli yafeilee@qq.com
INTRODUCTION TO SL4A