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Editorial Team
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Asked: 2026-06-04T04:58:08+00:00

I have an app widget project, which relies that a corresponding app is installed.

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I have an app widget project, which relies that a corresponding app is installed.

So, the paackage name of the required app is 

com.radlmaier.saintscalendar

In the app widgets manifest, I have the following tag inside the tag:

<uses-library android:name="com.radlmaier.saintscalendar" android:required="true" />

Now, when the app is not installed, the widget installation fails, as it should.
But if the app is installed, the widget installation fails, too, with logcat saying:

05-19 22:28:35.359: E/PackageManager(14680): Package com.radlmaier.saintscalendarwidget requires unavailable shared library com.radlmaier.saintscalendar; failing!

I am clearly missing something here.
Is it not possible to use the tag to check for an installed package as opposed to a shared library?
Can someone enlighten me?

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1 Answer

  1. Editorial Team

    Is it not possible to use the tag to check for an installed package as opposed to a shared library?

    That is most certainly not possible. <uses-library> is for requiring SDK add-ons (e.g., Google Maps).

    I have an app widget project, which relies that a corresponding app is installed.

    Android does not an application dependency mechanism, so if you want this, you will have to roll it yourself. Personally, I would recommend simply combining these into one application.

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