Embed Size (px)
DESCRIPTION
30 min developer crash on new features in Froyo
Citation preview
Android 2.2 FroyoRobert Cooper
User Features
Better BlueTooth support
Better Exchange support
Improved Camera app
Better Music app
Tethering
Infrastructure
Dalvik JIT (awesome sauce)
V8 in the Browser
Support for > 256MB RAM
SDIO improvements
Stuff You Care About
Apps on External Storage
Data Backup
Device Policy Manager
Cloud to Device Messaging
New UI Goodness Car Mode Night Mode
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
Apps on External Storage
New Compiler Framework?
This used to not work...
<uses-sdk android:minSdkVersion="4" />
With Platform compiler set in Eclipse
Apps on External Storage
<manifest xmlns:android="http://schemas.android.com/apk/res/android”package="com.totsp.crossword.shortyz” android:installLocation="preferExternal">
android:installLocation can be “preferExternal” or “auto”
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
Data Backup
Attaches Data to your users Android Market profile (Or other… OEM, Carrier, Whatever)
Data follows the user across devices or wipes
Data Backup
BackupAgent:
<application android:icon="@drawable/icon” android:label="@string/app_name”android:backupAgent="com.totsp.crossword.BackupAgent”android:restoreAnyVersion="true">
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
Data Backup
Well gee whiz Wally, that seems like a lot of work…
Data Backup
BackupAgentHelper
Allows you to compose multiple helpers to backup your data
Easy backup for SharedPrefs and Files
Databases?
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);}
}
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);}
}
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>
Device Policy Manager
<device-admin>
<uses-policies>
<limit-password />
<watch-login />
<reset-password />
<force-lock />
<wipe-data />
</uses-policies>
</device-admin>
Device Policy Manager
DON’T DO THIS!
public void onPasswordFailed(Context context, Intent intent) {
this.getManager(context).wipeData(0);
}
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
Cloud to Device Messaging
On the device…
<permission
android:name="com.totsp.crossword.shortyz.C2D_M
ESSAGE” android:protectionLevel="signature" />
<uses-permission
android:name="com.totsp.crossword.shortyz.C2D_M
ESSAGE" />
<uses-permission
android:name="com.google.android.c2dm.permissio
n.RECEIVE" />
Cloud to Device Messaging
<receiver android:name=".PushReceiver”
android:permission="com.google.android.c2dm.permission.SEND”>
<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>
Cloud to Device Messaging
Intent registrationIntent = new Intent("com.google.android.c2dm.intent.REGISTER");
registrationIntent.putExtra(”app", PendingIntent.getBroadcast(this, 0, new Intent(), 0);
registrationIntent.putExtra("sender”,”[email protected]”);
startService(registrationIntent);
Cloud to Device Messaging
protected void onReceive(Context context, Intent intent) {
String base64data = intent.getExtras().getString(PAYLOAD);
...
Cloud to Device Messaging
Sending Messages from the Server
Step 1: Post message to https://android.apis.google.com/c2dm/send
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
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?
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) {
