Android :: Widget Configuration Activity - Update Request

Sep 18, 2010

I'm having an issue with a config activity for a widget. According to the dev docs, if I specify a configuration activity than the onUpdate method of the AppWidgetProvider doesn't get called until after you request an update once you've completed the configuration activity. For me its happening in reverse, the onUpdate method of the AppWidgetProvider gets called first, followed by the configuration activity. Then the onUpdate method is never called after completion of the config activity even though I request it explicitly. I tried with level 4 and level 7 API, same result. Here is some of the source:

Manifest:
<?xml version="1.0" encoding="utf-8"?> <manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.chris.android.swidget"
android:versionCode="1" android:versionName="1.0">
<application android:icon="@drawable/app_icon" android:label="@string/app_name">
<activity android:name=".SWidgetConfigure">
<intent-filter> <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE" />
</intent-filter> </activity>
<receiver android:name=".SWidgetProvider" android:label="@string/ widget_name">
<meta-data android:name="android.appwidget.provider" android:resource="@xml/swidget_info"/> <intent-filter> <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter> </receiver>
<service android:name=".service.PUpdateService" />
</application> <uses-sdk android:minSdkVersion="4" />
<uses-permission android:name="android.permission.INTERNET" />

</manifest>
swidget_info.xml: <?xml version="1.0" encoding="utf-8"?> <appwidget-provider
xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="294dp" android:minHeight="72dp"
android:updatePeriodMillis="86400000"
android:initialLayout="@layout/swidget_layout"
android:configure="com.chris.android.swidget.SWidgetConfigure" >
</appwidget-provider>

I can include source of the onUpdate method from the AppWidgetProvider activity and the onCreate method of the configuration activity if necessary, but they are both being called find its just the order they show up on the emulator is wrong.

Android :: Widget Configuration Activity - Update Request


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CODE:..............

This is almost verbatim from the documentation. widget_id holds the widget ID that was dug up during the activity's onCreate().

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I've seen a couple places here and in the android docs this code used:

CODE:...................

But I don't know how to get the mAppWidgetId value. I tried following the example for a widget configuration activity here http://developer.android.com/guide/topics/appwidgets/index.html, but in the following code,

CODE:............

Extras is always null, so I never get the AppWidgetID.

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May 30, 2009

I've read through the Application Fundamentals three times today (and I had done so before), but I still can't quite wrap my ahead around the task concept. Or I guess I thought I understood it, but usually, the results I am seeing don't match up to what I would expect to happen (maybe a tool to see the current tasks/activities etc. for debugging purposes would be a nice addition).

I have multiple widgets from my provider in the Launcher desktop, and each is using a PendingIntent with a different URI as data (so they should be separate intents) to open an Activity.

I want there to be only once concurrent instance of this Activity that the user can access. So clicking the widget (1) , pressing HOME (2), clicking a different widget (3), pressing BACK (4) should bring the user back to the Desktop.

Now I did manage to do this using launchMode="singleTask" - the existing instance is brought to the top, onNewIntent() is called and I am pretty satisfied with it.

However, supposedly there are other ways to achieve an equivalent effect (say with having the activity restarted), and I'd like to understand why I don't seem to be able to get them to work: In every case, instead of seeing the home screen after step (4) (after pressing BACK), I see the *previous* instance of the Activity.

For example, if I read this correctly:

"There's another way to force activities to be removed from the stack. If an Intent object includes the FLAG_ACTIVITY_CLEAR_TOP flag, and the target task already has an instance of the type of activity that should handle the intent in its stack, all activities above that instance are cleared away so that it stands at the top of the stack and can respond to the intent. If the launch mode of the designated activity is "standard", it too will be removed from the stack, and a new instance will be launched to handle the incoming intent." http://developer.android.com/guide/topics/fundamentals.html

Then simply using using the following code to start my Activity from my widget should do what I want, no?

CODE:............

So in (3) My activity should be launched using FLAG_ACTIVITY_NEW_TASK by the launcher, which due to process affinity would find the existing task (which would consist of a single instance of my Activity), and launch the new instance on top of it. This explains what I am seeing. Why doesn't FLAG_ACTIVITY_CLEAR_TOP cause the existing instance in the task to be replaced?

Even setting android:launchMode explicitely to "standard", as mentioned in the doc quote above, this doesn't seem to change things.

I also tried android:finishOnTaskLaunch="true", but the behaviour is the exact same was just described with FLAG_ACTIVITY_CLEAR_TOP (which seems to be the exact same as when doing neither and really starting an activity without any special attributes).

I should mention that If I click the same widget in (3) as I clicked in (1), i.e. using the same PendingIntent twice, I do get the previous instance brought to the front (not restarted), but again, regardless of whether FLAG_ACTIVITY_CLEAR_TOP or finishOnTaskLaunch are being used.

I find this especially strange since the docs about tasks don't seem to mention the intent itself being relevant at all. Application Fundamentals does at one point say "For the default "standard" mode, a new instance is created to respond to every new intent", but it's not clear what "new intent" means then. Is triggering a PendingIntent multiple times through a widget not multiple "new" intents then?

I also tried various combinations of the other related options, but pretty much got nowhere.

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