Android widget not showing up on the list after developed

The problem was android:installLocation="preferExternal"

It somehow causes problem with widget list if the app is installed on SD

Ran across similar issues and this is what happened for me. The below Widget never showed up in the Widget drawer till minResizeHeight was added. Weird, but may be that is required for resizable widget. Could have been more friendly.

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:initialLayout="@layout/pmt_schedule_scroll_widget"
android:minHeight="146dip"
android:minResizeHeight="73dp"
android:minWidth="146dip"
android:resizeMode="vertical"
android:updatePeriodMillis="0" />

This kind of issue can happen with 2 scenarios. Both are answered above and this is a complete answer and I have faced both the scenarios and resolved both of them.

Scenario1

If the application specifies android:installLocation="preferExternal" parameter in manifest, App will be installed in external memory and it will not show in the widget list. Also if you have made your phone to install all the apps on sd card, this will also happen.

solution

Go to Settings->Apps->YourApp Then "move to phone". This will move the app to your phone memory and now you can see the widget in your widget list

Scenario2

If the above fix did not solve your issue, then you may have a device with android 4.X.X version.

Then you have to set at least following parameters in widget_info.xml file

solution2

android:minHeight="XXXdp" android:minWidth="XXXdp"