android:previewImage does not always work

Question

i use

 <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="40dp"
android:minHeight="40dp"
android:previewImage="@drawable/wgprevmini"
android:updatePeriodMillis="21600000"
android:initialLayout="@layout/widget_speriod"
android:widgetCategory="home_screen"
android:configure="com.chris.mydays.setwidgetuser"
/>

the preview image shows on SOME Device, but not on all.

For example
- Samsung Galaxy S5 (Android 5.0) it shows the preview just fine

• Moto G (android 5.0.2) it shows the Android Robot Icon ?

• Nexus One (android 2.3.6) it shows the Application icon

• Moto X (android 5.0.2) it shows the Application icon

Is there any solution i can make sure it shows the Preview Image always (do i need a special image format .. not its simple .png)

thx chris

Answer 1

I don't know why but when the Preview Image does not show up, restarting device always solve my problem. You may want to try it