native_activity: Fix clippy lints around NativeActivityGlue not `Se…

…ndSync` and unwritten `redraw_needed` field

android-activity/src/config.rs

@@ -6,13 +6,10 @@ use ndk::configuration::{
     ScreenSize, Touchscreen, UiModeNight, UiModeType,
 };
 
-/// A (cheaply clonable) reference to this application's [`ndk::configuration::Configuration`]
+/// A runtime-replacable reference to [`ndk::configuration::Configuration`].
 ///
-/// This provides a thread-safe way to access the latest configuration state for
-/// an application without deeply copying the large [`ndk::configuration::Configuration`] struct.
-///
-/// If the application is notified of configuration changes then those changes
-/// will become visible via pre-existing configuration references.
+/// If the application is notified of configuration changes then those changes will become visible
+/// via pre-existing configuration references.
 #[derive(Clone)]
 pub struct ConfigurationRef {
     config: Arc<RwLock<Configuration>>,

android-activity/src/native_activity/glue.rs

@@ -81,12 +81,14 @@ pub struct WaitableNativeActivityState {
     pub cond: Condvar,
 }
 
+// SAFETY: ndk::NativeActivity is also SendSync.
+unsafe impl Send for WaitableNativeActivityState {}
+unsafe impl Sync for WaitableNativeActivityState {}
+
 #[derive(Debug, Clone)]
 pub struct NativeActivityGlue {
     pub inner: Arc<WaitableNativeActivityState>,
 }
-unsafe impl Send for NativeActivityGlue {}
-unsafe impl Sync for NativeActivityGlue {}
 
 impl Deref for NativeActivityGlue {
     type Target = WaitableNativeActivityState;
@@ -223,7 +225,6 @@ pub struct NativeActivityState {
     /// Set as soon as the Java main thread notifies us of an
     /// `onDestroyed` callback.
     pub destroyed: bool,
-    pub redraw_needed: bool,
     pub pending_input_queue: *mut ndk_sys::AInputQueue,
     pub pending_window: Option<NativeWindow>,
 }
@@ -370,7 +371,6 @@ impl WaitableNativeActivityState {
                 thread_state: NativeThreadState::Init,
                 app_has_saved_state: false,
                 destroyed: false,
-                redraw_needed: false,
                 pending_input_queue: ptr::null_mut(),
                 pending_window: None,
             }),