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Question

My PreferenceActivity does not show up, even though it is in my manifest file

Answer 1

A:

Make sure your MySettingsActivity is in the com.p.t.wallpapers.mywallpaper package, otherwise you have to specify the absolute package name.

synic 2010-04-10 17:00:39

It is. That's the weird thing, both the service and activity are in the same package, and the service shows up just fine when I run the emulator. The activity doesn't though.

Charlie 2010-04-10 17:04:43

Answer 2

A:

I would add a leading dot on your android:name attributes (e.g., android:name=".MySettingsActivity") or fully-qualify their package (e.g., android:name="com.p.t.wallpapers.mywallpaper.MySettingsActivity").

Also, I would get rid of the import com.p.t.wallpapers.mywallpaper.R, as it should not be needed (you're already in that package) and might be masking a package problem.

If neither of those help, please update your question to explain where, exactly, you are getting the ActivityNotFoundExceptions.

CommonsWare 2010-04-10 17:14:31

I tried adding a leading . and using the full package name, as well as getting rid of the redundant import, still no luck. I've edited the question to include the error from logcat (or, at least a part of the error...can't put all of the error message up because it doesn't seem to format properly). Could this be caused by a malformed preference xml file? Other than the manifest file being wrong, that is the only thing I can think of that would throw off starting up the activity.

Charlie 2010-04-11 00:02:20

Your logcat does not appear in the question. An ActivityNotFoundException will not be caused by a malformed `preferences.xml` file. The exception is not that it can't start the activity, but it can't *find* the activity. Your bug is probably where you call `startActivity()` to start the activity. Also, I'm dubious about the `android:exported="true"` declaration on your activity, as I would not expect that to be needed.

CommonsWare 2010-04-11 00:07:14

Hi, I updated the question to include the output in logcat from the time I push to the emulator and to to the time I Force Close. I'm rather new to Android and Eclipse dev, so I'm trying to debug at the same time I'm trying to learn Android, so I really appreciate your responses. Is there anything you see in the logcat output that stands out?

Charlie 2010-04-11 00:34:06

Well, to me, it looks like what I originally wrote -- you need `android:name=".MySettingsActivity"` in the manifest. Please make that change, then post a fresh logcat if that does not clear up the problem.

CommonsWare 2010-04-11 01:00:15

I added another logcat output, this one from having ".MySettingsActivity" in the manifest file. Does it matter where in the manifest I declare my activity? Maybe I should put the activity before the service tag. Or maybe my activity tag needs an intent filter, even though it's a PreferenceActivity?

Charlie 2010-04-11 01:40:11

OK, the new logcat confirms a theory, two comments of mine ago, that the problem is on the sending side. You haven't showed where you call `startActivity()`. What that should look like is `startActivity(new Intent(ctxt, MySettingsActivity.class))`, where `ctxt` is a `Context` (perhaps your `MyWallpaper` service). If that's not what you're doing, try that and see if it helps.

CommonsWare 2010-04-11 01:50:23

I'm basing this off of the Cube live wallpaper example, and I was under the assumption I didn't need to programmaticaly call startActivity? The preference xml file is read in then Android takes care of instantiating the PreferenceActivity and starting it? I don't see a call to startActivity anywhere in the Cube live wallpaper source code.

Charlie 2010-04-11 03:16:33

Thanks CommonWare, but I finally figured it out! Posted an answer reply with the solution for future posterity.

Charlie 2010-04-11 09:10:41

Answer 3

+1 A:

Figured it out. It was the wallpaper xml that is referenced in the manifest, under the meta data tag in the service tag. Basically, that xml has

<wallpaper 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:settingsActivity="MySettingsActivity"/>

Notice the "MySettingsActivity" there? Yeah, since this is a separate file from the manifest, it doesn't automatically have a package it starts searching class names from. So all I had to do was put the full package path, like so

<wallpaper 
xmlns:android="http://schemas.android.com/apk/res/android"
android:settingsActivity="com.p.t.wallpapers.mywallpaper.MySettingsActivity" />

and voila! My preference screen pops up now when I hit the Settings... button, instead of force crashing. Oh man, facepalm!

Charlie 2010-04-11 09:10:04

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My PreferenceActivity does not show up, even though it is in my manifest file

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