Rotate ImageView in widget

I'm creating a widget where I need to rotate an ImageView. The ImageView resides insides a layout which in turn is described in a RemoteView. Is this possible? In my regular application Activity gained a reference to the ImageView using findViewById() and then calling setRotate(), but as RemoteView isn't an activity findViewById() isn't available.

I can see that it has been done before in this app: https://开发者_如何学编程market.android.com/details?id=com.lanteanstudio.compass

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If you are using RemoteViews, then you cannot directly change the visible View itself, as there is no way of getting a reference to it -- a RemoteViews object generally runs in a different process (in the case of the widgets on the Homescreen this is true - the widgets run in the Homescreen process, not your own).

Instead you need to create a new RemoteViews with the image rotated - you need to rotate the bitmap before setting it to the ImageView.

Then get an instance of AppWidgetManager, and call manager.updateAppWidget(appWidgetId, remoteView).

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After spending a day on this... I found the following code to work for my weather app widget to indicate wind direction.

• R.drawable.arrow is png in my drawable folder

• windDeg is an int obtained from openweathermap.org

• R.id.wind_direction is an ImageView

   val bmpOriginal: Bitmap = BitmapFactory.decodeResource(context.applicationContext.resources,         R.drawable.arrow)
   val bmpResult = Bitmap.createBitmap(bmpOriginal.width, bmpOriginal.height, Bitmap.Config.ARGB_8888)
   val tempCanvas = Canvas(bmpResult)
   tempCanvas.rotate(windDeg.toFloat(), bmpOriginal.width / 2.toFloat(), bmpOriginal.height / 2.toFloat())
   tempCanvas.drawBitmap(bmpOriginal, 0f, 0f, null)
   views.setImageViewBitmap(R.id.wind_direction, bmpResult)