chore(deps): Upgrade to ndk 0.9 and fix thread-safety interactions

Most changes were copied over from my `wry` PR at
tauri-apps/wry#1296.  Most notably a
`&ThreadLooper` is now passed to `wry::android_setup()` because we
have one, and it gives important safety guarantees when it comes to
registering callbacks on this looper, without (unnecessarily!) requiring
`Send`.  A thread-local requirement already exists for the `JNIEnv` that
is passed around anyway.

Also note that certain workarounds and illogical inverted passes
around `key_code()` handling are no longer needed, as the `ndk` crate
now passes an `enum` with the raw `i32` around so that the `.into()`
conversion for `i32` (the correct type) now becomes lossless.

.changes/ndk-0.9.md

@@ -0,0 +1,7 @@
+---
+"tao": major
+---
+
+**Breaking change**: Upgrade `ndk` crate to `0.9` and `ndk-sys` crate to `0.6`.  Types from the `ndk` crate are used in public API surface.
+**Breaking change**: Change `NativeKeyCode::Android(u32)` type to use `i32`, which is the native type used by all Android API.
+**Breaking change**: The `setup` function passed to `android_binding!()` must now take a `&ThreadLooper` instead of `&ForeignLooper`, matching the `wry` change in https://github.com/tauri-apps/wry/pull/1296.

Cargo.toml

@@ -97,8 +97,8 @@ once_cell = "1"
 
 [target."cfg(target_os = \"android\")".dependencies]
 jni = "0.21"
-ndk = "0.7"
-ndk-sys = "0.4"
+ndk = "0.9"
+ndk-sys = "0.6"
 ndk-context = "0.1"
 tao-macros = { version = "0.1.0", path = "./tao-macros" }
 

examples/transparent.rs

@@ -2,6 +2,7 @@
 // Copyright 2021-2023 Tauri Programme within The Commons Conservancy
 // SPDX-License-Identifier: Apache-2.0
 
+#[cfg(windows)]
 use std::{num::NonZeroU32, rc::Rc};
 
 use tao::{

src/keyboard.rs

@@ -192,7 +192,7 @@ pub enum NativeKeyCode {
 
   /// This is the android "key code" of the event as returned by
   /// `KeyEvent.getKeyCode()`
-  Android(u32),
+  Android(i32),
 }
 
 /// Represents the code of a physical key.

src/platform_impl/android/mod.rs

@@ -17,10 +17,8 @@ use ndk::{
   event::{InputEvent, KeyAction, MotionAction},
   looper::{ForeignLooper, Poll, ThreadLooper},
 };
-use ndk_sys::AKeyEvent_getKeyCode;
 use std::{
   collections::VecDeque,
-  convert::TryInto,
   sync::RwLock,
   time::{Duration, Instant},
 };
@@ -190,7 +188,7 @@ impl<T: 'static> EventLoop<T> {
         },
         Some(EventSource::InputQueue) => {
           if let Some(input_queue) = ndk_glue::input_queue().as_ref() {
-            while let Ok(Some(event)) = input_queue.get_event() {
+            while let Ok(Some(event)) = input_queue.event() {
               if let Some(event) = input_queue.pre_dispatch(event) {
                 let mut handled = true;
                 let window_id = window::WindowId(WindowId);
@@ -253,16 +251,9 @@ impl<T: 'static> EventLoop<T> {
                       _ => event::ElementState::Released,
                     };
 
-                    // We use the unsafe function directly because
-                    // we want to forward the keycode value even if it doesn't have a variant
-                    // defined in the ndk crate.
-                    let keycode_u32 = unsafe { AKeyEvent_getKeyCode(key.ptr().as_ptr()) as u32 };
-                    let keycode = keycode_u32
-                      .try_into()
-                      .unwrap_or(ndk::event::Keycode::Unknown);
-                    let physical_key =
-                      KeyCode::Unidentified(NativeKeyCode::Android(keycode.into()));
-                    let native = NativeKeyCode::Android(keycode_u32);
+                    let keycode = key.key_code();
+                    let native = NativeKeyCode::Android(keycode.into());
+                    let physical_key = KeyCode::Unidentified(native);
                     let logical_key = keycode_to_logical(keycode, native);
                     // TODO: maybe use getUnicodeChar to get the logical key
 
@@ -284,6 +275,7 @@ impl<T: 'static> EventLoop<T> {
                     };
                     call_event_handler!(event_handler, self.window_target(), control_flow, event);
                   }
+                  _ => {}
                 };
                 input_queue.finish_event(event, handled);
               }
@@ -1202,6 +1194,7 @@ fn keycode_to_logical(keycode: ndk::event::Keycode, native: NativeKeyCode) -> Ke
     ThumbsUp => Key::Unidentified(native),
     ThumbsDown => Key::Unidentified(native),
     ProfileSwitch => Key::Unidentified(native),
+    _ => Key::Unidentified(native),
   }
 }
 

src/platform_impl/android/ndk_glue.rs

@@ -120,17 +120,19 @@ pub fn content_rect() -> Rect {
   CONTENT_RECT.read().unwrap().clone()
 }
 
-static PIPE: Lazy<[RawFd; 2]> = Lazy::new(|| {
+pub static PIPE: Lazy<[OwnedFd; 2]> = Lazy::new(|| {
   let mut pipe: [RawFd; 2] = Default::default();
   unsafe { libc::pipe(pipe.as_mut_ptr()) };
-  pipe
+  pipe.map(|fd| unsafe { OwnedFd::from_raw_fd(fd) })
 });
 
 pub fn poll_events() -> Option<Event> {
   unsafe {
     let size = std::mem::size_of::<Event>();
     let mut event = Event::Start;
-    if libc::read(PIPE[0], &mut event as *mut _ as *mut _, size) == size as libc::ssize_t {
+    if libc::read(PIPE[0].as_raw_fd(), &mut event as *mut _ as *mut _, size)
+      == size as libc::ssize_t
+    {
       Some(event)
     } else {
       None
@@ -141,7 +143,7 @@ pub fn poll_events() -> Option<Event> {
 unsafe fn wake(event: Event) {
   log::trace!("{:?}", event);
   let size = std::mem::size_of::<Event>();
-  let res = libc::write(PIPE[1], &event as *const _ as *const _, size);
+  let res = libc::write(PIPE[1].as_raw_fd(), &event as *const _ as *const _, size);
   assert_eq!(res, size as libc::ssize_t);
 }
 
@@ -179,7 +181,7 @@ pub unsafe fn create(
   mut env: JNIEnv,
   _jclass: JClass,
   jobject: JObject,
-  setup: unsafe fn(&str, JNIEnv, &ForeignLooper, GlobalRef),
+  setup: unsafe fn(&str, JNIEnv, &ThreadLooper, GlobalRef),
   main: fn(),
 ) {
   //-> jobjectArray {
@@ -204,16 +206,20 @@ pub unsafe fn create(
     activity.as_obj().as_raw() as *mut _,
   );
 
-  let looper = ThreadLooper::for_thread().unwrap().into_foreign();
+  let looper = ThreadLooper::for_thread().unwrap();
   setup(PACKAGE.get().unwrap(), env, &looper, activity);
 
-  let mut logpipe: [RawFd; 2] = Default::default();
-  libc::pipe(logpipe.as_mut_ptr());
-  libc::dup2(logpipe[1], libc::STDOUT_FILENO);
-  libc::dup2(logpipe[1], libc::STDERR_FILENO);
+  let logpipe = {
+    let mut logpipe: [RawFd; 2] = Default::default();
+    libc::pipe(logpipe.as_mut_ptr());
+    libc::dup2(logpipe[1], libc::STDOUT_FILENO);
+    libc::dup2(logpipe[1], libc::STDERR_FILENO);
+
+    logpipe.map(|fd| unsafe { OwnedFd::from_raw_fd(fd) })
+  };
   thread::spawn(move || {
     let tag = CStr::from_bytes_with_nul(b"RustStdoutStderr\0").unwrap();
-    let file = File::from_raw_fd(logpipe[0]);
+    let file = File::from_raw_fd(logpipe[0].as_raw_fd());
     let mut reader = BufReader::new(file);
     let mut buffer = String::new();
     loop {
@@ -236,7 +242,7 @@ pub unsafe fn create(
     let foreign = looper.into_foreign();
     foreign
       .add_fd(
-        PIPE[0],
+        PIPE[0].as_fd(),
         NDK_GLUE_LOOPER_EVENT_PIPE_IDENT,
         FdEvent::INPUT,
         std::ptr::null_mut(),