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How to create custom widgets?

When using widget development for Android, it seems like you cannot add your own view classes to AppWidgetProvider.

For example, I created a custom class that extends the view, this works great when used in Activity, but the moment I add it to the widget, I get a “ClassNotFoundException” because Android seems to allow a set of specific system widgets to be added .

I saw some applications that look like they have their own custom widgets. For example, there is one that brings up a radial menu when clicked that shows application shortcuts. How are they implemented? Is there any work using my own widget? They seem to have a canvas that they can draw inside the widget.

Good quick example https://market.android.com/details?id=zombiesinthelab.widgets.droidpetwidget&feature=top-paid So, this widget is done by simply drawing the ImageViews and periodically updating them against using the canvas to draw frames?

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Android widgets can only contain widget layouts supported by RemoteViews . See this list :

The RemoteViews object (and therefore the App Widget) can support the following layout classes:

FrameLayout LinearLayout RelativeLayout

And the following widget classes:

 AnalogClock Button Chronometer ImageButton ImageView ProgressBar TextView

Descendants of these classes are not supported.

Pay attention to the last sentence. You cannot change this behavior, it is hardcoded in android.

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I don't have a big idea on how to create widgets, but links can definitely help you:

1) http://developer.android.com/guide/topics/appwidgets/index.html

2) http://developer.android.com/guide/practices/ui_guidelines/widget_design.html

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Source: https://habr.com/ru/post/1346530/

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