Android :: Potential - Bug In The Implementation Of AppWidgets
Nov 10, 2009
We have discovered a potential bug in the implementation of AppWidgets. Here is a simple reproducer.
Attached is the code for an application containing a TestActivity and a TestWidget. TestActivity extends MapActivity and TestWidget is a simple widget provider which updates a TextView every 2 seconds. Now if the TestActivity is launched with no instance of TestWidget running, it works just fine. But if the TestActivity is launched after placing the TestWidget on the home, it results in ClassNotFoundException. Here is what we get:
CODE:.............
So it seems we have an inconsistency in the way the class loader works for the same apk.
WORKS - Launch the application by itself, without invoking the Widget. DOES NOT WORK - Create a Widget on the Home screen and then launch the application from the launcher.
The source code for this application (http://www.yousendit.com/ download/TzY3ZGVhZy96NE4zZUE9PQ) has been attached. Hope someone from the Android team can shed light on this behavior.
This error is seen on the 1.5r3 SDK. Not sure if this has been addressed in 1.6 and 2.0 SDKs..
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May 8, 2009
I'm trying to make an AppWidget, and for some reason the Eclipse debugger doesn't suspend on any of the breakpoints I set (but I know the code is executed because I see it working on the emulator). I don't have this problem with other 'regular' apps (non AppWidgets). Is this a known limitation, or is it just a problem on my installation?
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Apr 18, 2010
We have created an AppWidget that takes user inputted text into an EditText and displays a calculated amount of text inside a TextView on the Home Screen. We calculate the amount of text based on the AppWidgetInfo.minWidth, minHeight attributes. We do this to simulate scrolling; we cut up the user-inputted text into chunks that will fit into the widget and swap them based on button clicks.
When we save the widget with the device in Landscape mode, it calculates the appropriate amount of text for Landscape mode and displays it in the widget. The problem is when the user changes orientation of the device to Portrait mode (without opening the widget and resaving the text), the calculated amount of text for Landscape mode is still displayed. This also happens in the vice versa case (the user is in Portrait and saves, etc.)
How can we tell our AppWidget to recalculate the amount of text displayed on screen orientation change? Is this possible? How would you solve this problem?
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Sep 17, 2010
I'm making an Android AppWidget to sit on the home screen.
The user's home screen space is precious, so I want the widget to be small. The ideal size would be 2x1 cells.
Some documentation suggests you can have any size you like?
But the AppWidget graphical design guidelines imply that only standard sizes are supported: 4x1, 3x3, 2x2.
Does that refer to the available PhotoShop templates or is it a limitation of Android itself?
I'm finding that a 2x1 widget works on my actual device (HTC Wildfire) but expands to 2x2 on the emulator.
HTC have their own special implementation of the home screen, so maybe my widget will only work at 2x1 on HTC devices?
Is there any way to create a 2x1 widget, or should I use a standard size?
My widget was adapted from the Simple Wiktionary sample.
The manifest has android:minWidth="146dip" and android:minHeight="72dip".
There's a RelativeLayout with android:layout_width="fill_parent" and android:layout_height="wrap_content"
I'm just starting with Android, so apologies in advance if this is a silly question. :)
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Jan 22, 2010
There is a given set of predefinied Views that can be used in layouts for AppWidgets. How can a customized View added to this list?
The minimum requirement is that the class is annotated with RemoteView. What else is necessary to be acceptable as view in the layout.xml?
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Mar 5, 2010
Is it possible to programmatically create and/or destroy AppWidgets?
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May 21, 2009
I'm writing a widget. Currently, I'm have a simple ImageView, and calling RemoteViews.setImageViewBitmap(). I'm using a service to do the updates.
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