Clippy lint fixes

android-activity/src/game_activity/mod.rs

@@ -174,19 +174,28 @@ impl AndroidApp {
     }
 }
 
+// Wrapper around the raw android_app pointer that can be safely sent across threads.
+// SAFETY: The android_app pointer is managed by the GameActivity glue code and protected
+// by a Mutex. Access is synchronized and the pointer is cleared on APP_CMD_DESTROY.
+// The Mutex wrapper provides Sync, so we only need to implement Send.
+#[derive(Debug)]
+struct SendAndroidApp(*mut ffi::android_app);
+
+unsafe impl Send for SendAndroidApp {}
+
 #[derive(Debug, Clone)]
 struct GameActivityGlue {
-    game_activity_app: Arc<Mutex<*mut ffi::android_app>>,
+    game_activity_app: Arc<Mutex<SendAndroidApp>>,
 }
 
 impl GameActivityGlue {
     fn new(game_activity_app: *mut ffi::android_app) -> Self {
         Self {
-            game_activity_app: Arc::new(Mutex::new(game_activity_app)),
+            game_activity_app: Arc::new(Mutex::new(SendAndroidApp(game_activity_app))),
         }
     }
 
-    fn locked_app(&self) -> std::sync::MutexGuard<'_, *mut ffi::android_app> {
+    fn locked_app(&self) -> std::sync::MutexGuard<'_, SendAndroidApp> {
         self.game_activity_app.lock().unwrap()
     }
 
@@ -203,7 +212,7 @@ impl GameActivityGlue {
         F: FnOnce(*mut ffi::android_app) -> R,
     {
         let app = self.locked_app();
-        f(*app)
+        f(app.0)
     }
 
     /// Called when handling the `APP_CMD_DESTROY` event to clear our retained
@@ -211,7 +220,7 @@ impl GameActivityGlue {
     /// accidentally access it after it's been freed.
     fn clear_app(&self) {
         let mut app = self.locked_app();
-        *app = ptr::null_mut();
+        app.0 = ptr::null_mut();
     }
 }
 

android-activity/src/init.rs

@@ -33,7 +33,7 @@ fn forward_stdio_to_logcat() -> std::thread::JoinHandle<std::io::Result<()>> {
     std::thread::Builder::new()
         .name("stdio-to-logcat".to_string())
         .spawn(move || -> std::io::Result<()> {
-            let tag = CStr::from_bytes_with_nul(b"RustStdoutStderr\0").unwrap();
+            let tag = c"RustStdoutStderr";
             let mut reader = BufReader::new(file);
             let mut buffer = String::new();
             loop {
@@ -258,7 +258,7 @@ fn try_init_current_thread(env: &mut jni::Env, activity: &JObject) -> jni::error
     // Also name native thread - this needs to happen here after attaching to a JVM thread,
     // since that changes the thread name to something like "Thread-2".
     unsafe {
-        let thread_name = std::ffi::CStr::from_bytes_with_nul(b"android_main\0").unwrap();
+        let thread_name = c"android_main";
         let _ = libc::pthread_setname_np(libc::pthread_self(), thread_name.as_ptr());
     }
     Ok(())

android-activity/src/input/sdk.rs

@@ -78,9 +78,9 @@ jni::bind_java_type! {
 }
 
 impl AKeyCharacterMap<'_> {
-    pub(crate) fn get<'local>(
+    pub(crate) fn get(
         &self,
-        env: &'local mut jni::Env,
+        env: &mut jni::Env,
         key_code: jint,
         meta_state: jint,
     ) -> Result<jint, InternalAppError> {
@@ -97,10 +97,7 @@ impl AKeyCharacterMap<'_> {
             .map_err(|err| jni_utils::clear_and_map_exception_to_err(env, err))
     }
 
-    pub(crate) fn get_keyboard_type<'local>(
-        &self,
-        env: &'local mut jni::Env,
-    ) -> Result<jint, InternalAppError> {
+    pub(crate) fn get_keyboard_type(&self, env: &mut jni::Env) -> Result<jint, InternalAppError> {
         self._get_keyboard_type(env)
             .map_err(|err| jni_utils::clear_and_map_exception_to_err(env, err))
     }
@@ -183,7 +180,7 @@ impl KeyCharacterMap {
             }
         })
         .map_err(|err| {
-            let err: InternalAppError = err.into();
+            let err: InternalAppError = err;
             err.into()
         })
     }
@@ -217,7 +214,7 @@ impl KeyCharacterMap {
             })
         })
         .map_err(|err| {
-            let err: InternalAppError = err.into();
+            let err: InternalAppError = err;
             err.into()
         })
     }
@@ -239,7 +236,7 @@ impl KeyCharacterMap {
             Ok(keyboard_type.into())
         })
         .map_err(|err| {
-            let err: InternalAppError = err.into();
+            let err: InternalAppError = err;
             err.into()
         })
     }

android-activity/src/lib.rs

@@ -206,9 +206,9 @@
 //!
 //! Before `android_main()` is called:
 //! - A `JavaVM` and
-//!    [`android.content.Context`](https://developer.android.com/reference/android/content/Context)
-//!    instance will be associated with the [`ndk_context`] crate so that other,
-//!    independent, Rust crates are able to find a JavaVM for making JNI calls.
+//!   [`android.content.Context`](https://developer.android.com/reference/android/content/Context)
+//!   instance will be associated with the [`ndk_context`] crate so that other,
+//!   independent, Rust crates are able to find a JavaVM for making JNI calls.
 //! - The `JavaVM` will be attached to the native thread (for JNI)
 //! - A [Looper] is attached to the Rust native thread.
 //!
@@ -1358,7 +1358,7 @@ impl<'a> OnCreateState<'a> {
     /// - Don't wrap the reference in an `Auto` which would treat the reference
     ///   like a local reference and try to delete it when dropped.
     pub fn activity_as_ptr(&self) -> *mut c_void {
-        self.java_activity as *mut c_void
+        self.java_activity
     }
 
     /// Returns the saved state of the `Activity` as a byte slice, which may be

android-activity/src/native_activity/mod.rs

@@ -351,7 +351,7 @@ impl AndroidAppInner {
             return;
         }
 
-        let na_mut = na as *mut ndk_sys::ANativeActivity;
+        let na_mut = na;
         unsafe {
             ndk_sys::ANativeActivity_setWindowFlags(
                 na_mut.cast(),

android-activity/src/util.rs

@@ -32,7 +32,7 @@ pub(crate) fn android_log(level: Level, tag: &CStr, msg: &CStr) {
 }
 
 pub(crate) fn log_panic(panic: Box<dyn std::any::Any + Send>) {
-    let rust_panic = unsafe { CStr::from_bytes_with_nul_unchecked(b"RustPanic\0") };
+    let rust_panic = c"RustPanic";
 
     if let Some(panic) = panic.downcast_ref::<String>() {
         if let Ok(msg) = CString::new(panic.clone()) {
@@ -43,10 +43,7 @@ pub(crate) fn log_panic(panic: Box<dyn std::any::Any + Send>) {
             android_log(Level::Error, rust_panic, &msg);
         }
     } else {
-        let unknown_panic = unsafe { CStr::from_bytes_with_nul_unchecked(b"UnknownPanic\0") };
-        android_log(Level::Error, unknown_panic, unsafe {
-            CStr::from_bytes_with_nul_unchecked(b"\0")
-        });
+        android_log(Level::Error, rust_panic, c"UnknownPanic");
     }
 }