Android: AppWidget with custom view not working

Question

I am creating a appwidget that consists of a single custom view called Foo.

xml/widget.xml:

Answer 1

I pretty much left my custom view intact, and implemented an ImageView for my widget, then rendered the view using the getDrawingCache()

MyView myView = new MyView(context);
myView.measure(150,150);
myView.layout(0,0,150,150);
myView.setDrawingCacheEnabled(true);
Bitmap bitmap=myView.getDrawingCache();
remoteViews.setImageViewBitmap(R.id.dial, bitmap);

Answer 2

You cannot have ANY custom view used in widget. In fact, even those android-predfined views are not all supported.

For detailed list of supported widgets/layouts, please read the documentation. Anything other than those documented cannot be placed in widgets.

Answer 3

Another way to do this without using getDrawingCache() :

MyView myView = new MyView(this);
myView.measure(500, 500);
myView.layout(0, 0, 500, 500);
Bitmap bitmap = Bitmap.createBitmap(500, 500, Bitmap.Config.ARGB_8888);
myView.draw(new Canvas(bitmap));
remoteViews.setImageViewBitmap(R.id.imageView, bitmap);

I used cache not to redraw all the view so I couldn't use the code above. And I find it more elegant. I hope it could be useful to someone.

Answer 4

see the documentation.

AnalogClock, Button, Chronometer, ImageButton, ImageView, ProgressBar and TextView are the supported views. For layouts you have to use FrameLayout, LinearLayout or RelativeLayout.