android: use show_soft_input to summon the keyboard

Route it via the `Window::set_ime_allowed` like on iOS.

src/changelog/unreleased.md

@@ -46,6 +46,7 @@ changelog entry.
   to fully disable the menu bar and dock in Borderless Fullscreen as commonly done in games.
 - On X11, the `window` example now understands the `X11_VISUAL_ID` and `X11_SCREEN_ID` env
   variables to test the respective modifiers of window creation.
+- On Android, the soft keyboard can now be shown using `Window::set_ime_allowed`.
 
 ### Fixed
 

src/platform_impl/android/mod.rs

@@ -908,7 +908,13 @@ impl Window {
 
     pub fn set_ime_cursor_area(&self, _position: Position, _size: Size) {}
 
-    pub fn set_ime_allowed(&self, _allowed: bool) {}
+    pub fn set_ime_allowed(&self, allowed: bool) {
+        if allowed {
+            self.app.show_soft_input(true);
+        } else {
+            self.app.hide_soft_input(true);
+        }
+    }
 
     pub fn set_ime_purpose(&self, _purpose: ImePurpose) {}
 

src/window.rs

@@ -1274,7 +1274,8 @@ impl Window {
     ///
     /// - **macOS:** IME must be enabled to receive text-input where dead-key sequences are
     ///   combined.
-    /// - **iOS / Android / Web / Orbital:** Unsupported.
+    /// - **iOS / Android:** This will show / hide the soft keyboard.
+    /// - **Web / Orbital:** Unsupported.
     /// - **X11**: Enabling IME will disable dead keys reporting during compose.
     ///
     /// [`Ime`]: crate::event::WindowEvent::Ime