Pass force on touch events on android

src/event.rs

@@ -939,7 +939,10 @@ pub struct Touch {
     ///
     /// ## Platform-specific
     ///
-    /// - Only available on **iOS** 9.0+, **Windows** 8+, and **Web**.
+    /// - Only available on **iOS** 9.0+, **Windows** 8+, **Web**, and **Android**.
+    /// - **Android**: This will never be [None]. If the device doesn't support pressure
+    /// sensitivity, force will either be 0.0 or 1.0. Also see the
+    /// [android documentation](https://developer.android.com/reference/android/view/MotionEvent#AXIS_PRESSURE).
     pub force: Option<Force>,
     /// Unique identifier of a finger.
     pub id: u64,

src/platform_impl/android/mod.rs

@@ -23,7 +23,7 @@ use raw_window_handle::{
 use crate::{
     dpi::{PhysicalPosition, PhysicalSize, Position, Size},
     error,
-    event::{self, InnerSizeWriter, StartCause},
+    event::{self, Force, InnerSizeWriter, StartCause},
     event_loop::{self, ControlFlow, DeviceEvents, EventLoopWindowTarget as RootELW},
     platform::pump_events::PumpStatus,
     window::{
@@ -426,7 +426,7 @@ impl<T: 'static> EventLoop<T> {
                                 phase,
                                 location,
                                 id: pointer.pointer_id() as u64,
-                                force: None,
+                                force: Some(Force::Normalized(pointer.pressure() as f64)),
                             }),
                         };
                         callback(event, self.window_target());