Mixing
Android - is passing dirty rectangle to View.invalidate() still necessary?
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I am using google maps in android. I have a created a polygon of points and am using it as a geofence to trigger some action.
I would like to take the polygon of points and convert them into a rectangle so that i can call invalidate only on the rectangle area. As we know android screen is compromised of rectangles and we can when we call invalidate() on a view we have the option to invalidate (redraw) just a rectangle area. this is more efficient then re-drawing the entire screen when only a part of it has changed. In the map i have i know that only . inside the geofence area has my view changes (im doing animation there actually).
so i a google polygon class and if i call polygon?.points it has a list of LatLng objects. i can use GoogleMap.projection
to get the matching screen coordinates on the phone of hte gps coordinates in the polygon.points list. But now i want to call:
postInvalidateOnAnimation and pass in the rectangle area coordinates that is "dirty" so it can redraw it. but then in the docs for invalidate method
i see the following note:
This method was deprecated in API level 28.
The switch to hardware accelerated rendering in API 14 reduced the importance of the dirty rectangle. In API 21 the given rectangle is ignored entirely in favor of an internally-calculated area instead. Because of this, clients are encouraged to just call invalidate().
does this only for api 28 and upwards or from 14 and upwards that passing a dirty rectangle is pointless ? if there is still a point to it how can i convert the polygon points (many points) to rectangle coordinates (4 points) ?
android android-view google-maps-android-api-2 asked Jan 3 at 6:06
j2emanuej2emanue
24k28146263
add a comment |
I am using google maps in android. I have a created a polygon of points and am using it as a geofence to trigger some action.
I would like to take the polygon of points and convert them into a rectangle so that i can call invalidate only on the rectangle area. As we know android screen is compromised of rectangles and we can when we call invalidate() on a view we have the option to invalidate (redraw) just a rectangle area. this is more efficient then re-drawing the entire screen when only a part of it has changed. In the map i have i know that only . inside the geofence area has my view changes (im doing animation there actually).
so i a google polygon class and if i call polygon?.points it has a list of LatLng objects. i can use GoogleMap.projection
to get the matching screen coordinates on the phone of hte gps coordinates in the polygon.points list. But now i want to call:
postInvalidateOnAnimation and pass in the rectangle area coordinates that is "dirty" so it can redraw it. but then in the docs for invalidate method
i see the following note:
This method was deprecated in API level 28.
The switch to hardware accelerated rendering in API 14 reduced the importance of the dirty rectangle. In API 21 the given rectangle is ignored entirely in favor of an internally-calculated area instead. Because of this, clients are encouraged to just call invalidate().
does this only for api 28 and upwards or from 14 and upwards that passing a dirty rectangle is pointless ? if there is still a point to it how can i convert the polygon points (many points) to rectangle coordinates (4 points) ?
android android-view google-maps-android-api-2 asked Jan 3 at 6:06
j2emanuej2emanue
24k28146263
add a comment |
I am using google maps in android. I have a created a polygon of points and am using it as a geofence to trigger some action.
I would like to take the polygon of points and convert them into a rectangle so that i can call invalidate only on the rectangle area. As we know android screen is compromised of rectangles and we can when we call invalidate() on a view we have the option to invalidate (redraw) just a rectangle area. this is more efficient then re-drawing the entire screen when only a part of it has changed. In the map i have i know that only . inside the geofence area has my view changes (im doing animation there actually).
so i a google polygon class and if i call polygon?.points it has a list of LatLng objects. i can use GoogleMap.projection
to get the matching screen coordinates on the phone of hte gps coordinates in the polygon.points list. But now i want to call:
postInvalidateOnAnimation and pass in the rectangle area coordinates that is "dirty" so it can redraw it. but then in the docs for invalidate method
i see the following note:
This method was deprecated in API level 28.
The switch to hardware accelerated rendering in API 14 reduced the importance of the dirty rectangle. In API 21 the given rectangle is ignored entirely in favor of an internally-calculated area instead. Because of this, clients are encouraged to just call invalidate().
does this only for api 28 and upwards or from 14 and upwards that passing a dirty rectangle is pointless ? if there is still a point to it how can i convert the polygon points (many points) to rectangle coordinates (4 points) ?
android android-view google-maps-android-api-2 asked Jan 3 at 6:06
j2emanuej2emanue
24k28146263
I am using google maps in android. I have a created a polygon of points and am using it as a geofence to trigger some action.
I would like to take the polygon of points and convert them into a rectangle so that i can call invalidate only on the rectangle area. As we know android screen is compromised of rectangles and we can when we call invalidate() on a view we have the option to invalidate (redraw) just a rectangle area. this is more efficient then re-drawing the entire screen when only a part of it has changed. In the map i have i know that only . inside the geofence area has my view changes (im doing animation there actually).
so i a google polygon class and if i call polygon?.points it has a list of LatLng objects. i can use GoogleMap.projection
to get the matching screen coordinates on the phone of hte gps coordinates in the polygon.points list. But now i want to call:
postInvalidateOnAnimation and pass in the rectangle area coordinates that is "dirty" so it can redraw it. but then in the docs for invalidate method
i see the following note:
This method was deprecated in API level 28.
The switch to hardware accelerated rendering in API 14 reduced the importance of the dirty rectangle. In API 21 the given rectangle is ignored entirely in favor of an internally-calculated area instead. Because of this, clients are encouraged to just call invalidate().
does this only for api 28 and upwards or from 14 and upwards that passing a dirty rectangle is pointless ? if there is still a point to it how can i convert the polygon points (many points) to rectangle coordinates (4 points) ?
android android-view google-maps-android-api-2 android android-view google-maps-android-api-2 asked Jan 3 at 6:06
j2emanuej2emanue
24k28146263
asked Jan 3 at 6:06
j2emanuej2emanue
24k28146263
asked Jan 3 at 6:06
j2emanuej2emanue
24k28146263
asked Jan 3 at 6:06
j2emanuej2emanue
24k28146263
asked Jan 3 at 6:06
j2emanuej2emanue
24k28146263
24k28146263
add a comment |
add a comment |
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