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Android 4.0: widgets not appearing?

<RelativeLayout android:id="@+id/relativeLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">

    <TextView android:layout_width="wrap_content" android:id="@+id/blankspot" android:layout_height="5dp" android:gravity="center" android:shadowDy="1" android:shadowDx="1" android:layout_centerHorizontal="true"></TextView>

    <ImageButton android:layout_below="@+id/blankspot" android:layout_width="60dp" android:layout_height="60dp" android:id="@+id/widgetIconButton" android:layout_centerHorizontal="true" android:scaleType="centerCrop" android:src="@drawable/volumeprofilesplus" android:background="@null"></ImageButton>

    <ImageView android:layout_width="60dp" android:layout_height="20dp" android:id="@+id/override" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:scaleType="fitXY" android:background="@null" android:src="@drawable/overredcaps" android:visibility="invisible"></ImageView>

    <ImageButton android:layout_below="@+id/widgetIconButton" android:layout_width="70dp" android:layout_height="30dp" android:id="@+id/widgetSettingsButton" android:layout_centerHorizontal="true" android:scaleType="fitXY" android:src="@drawable/settings" android:background="@null"></ImageButton>

</RelativeLayout>

       

<?xml version="1.0" encoding="utf-8"?>

<appwidget-provider

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:minWidth="72dip"

    android:minHeight="72dip"

    android:updatePeriodMillis="0"

    android:initialLayout="@layout/main" >    

</appwidget-provider>

       

<receiver android:name=".VolumeProfilesWidget" android:label="@string/app_name">

        <intent-filter>

            <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />                

            <!-- Broadcast Receiver that will also process our self created action -->

            <action android:name="net.thepurge.volumeprofiles.plus.VolumeProfilesWidget.ACTION_WIDGET_RECEIVER"/>              

        </intent-filter>

        <meta-data android:name="android.appwidget.provider" android:resource="@xml/volumeprofiles_widget_provider" />

    </receiver>

       

<activity android:name=".MainActivity"

              android:label="@string/app_name">

        <intent-filter>

            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />                

            <action android:name="net.thepurge.volumeprofiles.plus.VolumeProfilesWidget.ACTION_WIDGET_CONFIGURE"/>

        </intent-filter>

    </activity>