This document summarizes new features and changes in Android 2.2 Froyo. It includes improved support for Bluetooth, Exchange, camera, music apps, and tethering. It also describes new developer features like apps on external storage, data backup, device policy manager, cloud to device messaging, and UI improvements like car and night modes. Key infrastructure changes include JIT compilation, V8 JavaScript engine, and support for over 256MB RAM.

1. Android 2.2
Froyo
Robert Cooper

2. User Features
 Better BlueTooth support
 Better Exchange support
 Improved Camera app
 Better Music app
 Tethering

3. Infrastructure
 Dalvik JIT (awesome sauce)
 V8 in the Browser
 Support for > 256MB RAM
 SDIO improvements

4. Stuff You Care About
 Apps on External Storage
 Data Backup
 Device Policy Manager
 Cloud to Device Messaging
 New UI Goodness
 Car Mode
 Night Mode

5. Stuff You Care About
 New Search Support
 Camera Preview (Now ~20 FPS)
 OpenGL ES 2.0
 Improved Media Framework/OpenCore
 Crash and Hang Reports on the Market

6. Apps on External Storage
 New Compiler Framework?
This used to not work...
<uses-sdkandroid:minSdkVersion="4" />
With Platform compiler set in Eclipse

7. Apps on External Storage
<manifest
xmlns:android="http://schemas.android.c
om/apk/res/android”
package="com.totsp.crossword.shortyz”
android:installLocation="preferExternal
">
android:installLocation can be “preferExternal” or
“auto”

8. Apps on External Storage
Doesn’t work when you have a …
 Service
 Input Method Engine
 Widget or Live Folder
 Live Wallpaper
 Account Manager or Sync Adapter
 Device Administration Receiver

9. Data Backup
 Attaches Data to your users Android Market
profile (Or other… OEM, Carrier, Whatever)
 Data follows the user across devices or wipes

10. Data Backup
BackupAgent:
<application
android:icon="@drawable/icon”
android:label="@string/app_name”
android:backupAgent=
"com.totsp.crossword.BackupAgent”
android:restoreAnyVersion="true">

11. Backup Agent
 You can implement BackupAgent yourself
 Triggers onBackup() and onRestore() on the
BackupAgent interface
 Gives you BackupDataOutput and
BackupDataInput classes
 You can use these to write arbitrary binary data
to a keyed data set

12. Data Backup
Well gee whiz Wally, that seems like a lot of work…

13. Data Backup
BackupAgentHelper
 Allows you to compose multiple helpers to
backup your data
 Easy backup for SharedPrefs and Files
 Databases?

14. Data Backup
public class BackupAgent extends
BackupAgentHelper {
static final String PREFS =
"user_preferences”;
static final String PREFS_BACKUP_KEY =
"prefs”;
public void onCreate() {
SharedPreferencesBackupHelper helper =
new
SharedPreferencesBackupHelper(this, PREFS);
addHelper(PREFS_BACKUP_KEY, helper);
}
}

15. Data Backup
public class MyFileBackupAgent extends
BackupAgentHelper {
static final String TOP_SCORES = "scores”;
static final String PLAYER_STATS = "stats”;
static final String FILES_BACKUP_KEY =
"myfiles”;
void onCreate() {
FileBackupHelper helper = new
FileBackupHelper(this, TOP_SCORES,
PLAYER_STATS);
addHelper(FILES_BACKUP_KEY, helper);
}
}

16. Device Policy Manager
<receiver android:name=".app.DeviceAdminSample”
android:label="@string/sample_device_admin”
android:description=
"@string/sample_device_admin_description”
android:permission=
"android.permission.BIND_DEVICE_ADMIN">
<meta-data android:name="android.app.device_admin”
android:resource="@xml/device_admin" />
<intent-filter>
<action
android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
</intent-filter>
</receiver>

17. Device Policy Manager
<device-admin>
<uses-policies>
<limit-password />
<watch-login />
<reset-password />
<force-lock />
<wipe-data />
</uses-policies>
</device-admin>

18. Device Policy Manager
DON’T DO THIS!
public void onPasswordFailed(Context
context, Intent intent) {
this.getManager(context).wipeData(0);
}

19. Cloud to Device Messaging
 Pass a K-V Pair data object to device (Intent
extras)
 Sent from your server, to Google
 Addressed with user’s device reg id and
application package name

20. Cloud to Device Messaging
On the device…
<permission
android:name="com.totsp.crossword.shortyz.C2D
_MESSAGE” android:protectionLevel="signature"
/>
<uses-permission
android:name="com.totsp.crossword.shortyz.C2D
_MESSAGE" />
<uses-permission
android:name="com.google.android.c2dm.permiss
ion.RECEIVE" />

21. Cloud to Device Messaging
<receiver android:name=".PushReceiver”
android:permission="com.google.android.c2dm.permission.SEN
D”>
<intent-filter>
<action
android:name="com.google.android.c2dm.intent.RECEIVE" />
<category android:name="com.totsp.crossword.shortyz" />
</intent-filter>
<intent-filter>
<action
android:name="com.google.android.c2dm.intent.REGISTRATION"
/><category android:name="com.totsp.crossword.shortyz" />
</intent-filter>
</receiver>

22. Cloud to Device Messaging
Intent registrationIntent = new
Intent("com.google.android.c2dm.intent.REGI
STER");
registrationIntent.putExtra(”app", PendingInt
ent.getBroadcast(this, 0, new Intent(), 0);
registrationIntent.putExtra("sender”,”shortyz
-noreply@kebernet.net”);
startService(registrationIntent);

23. Cloud to Device Messaging
protected void onReceive(Context
context, Intent intent) {
String base64data =
intent.getExtras().getString(PAYLOAD);
...

24. Cloud to Device Messaging
Sending Messages from the Server
Step 1: Post message to
https://android.apis.google.com/c2dm/send

25. Cloud to Device Messaging
Post Fields
 registration_id : Reg id from the phone
 collapse_key : A key used to prune
dupes/clobbers when the phone is offline
 data.[some name]: Data to push to the intent
 delay_while_idle: Don’t push if the phone is idle
 Authorization header for the sender

26. Cloud to Device Messaging
Hard Parts:
 One Way – no Device to Cloud Messaging
 Juggling Registration IDs in your app and from
the phone
 Device registers, gets a reg ID
 posts it back to your app with your apps user
creds, etc
 Where is my Google Wave “State” object for
this?

27. UiModeManager
 Lets you change the display mode or alter your
display based on the current mode
UiModeManager mgr = (UiModeManager)
getSystemService(UI_MODE_SERVICE);
mgr.setNightMode(UiModeManager.MODE_NIGHT_YES
);
// ----
if(mgr.getCurrentModeType() ==
Configuration.UI_MODE_TYPE_DESK) {

28. Lots More
http://developer.android.com