diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 70138369..3337e2c2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,7 +27,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: hecrj/setup-rust-action@v1
     - run: cargo install --path xbuild --root .
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: ${{ matrix.host }}-x
         path: bin/x${{ matrix.host == 'windows-latest' && '.exe' || '' }}
diff --git a/apk/src/compiler/table.rs b/apk/src/compiler/table.rs
index aa199ebe..2b50fb33 100644
--- a/apk/src/compiler/table.rs
+++ b/apk/src/compiler/table.rs
@@ -144,7 +144,7 @@ pub struct Entry<'a> {
     entry: &'a ResTableEntry,
 }
 
-impl<'a> Entry<'a> {
+impl Entry<'_> {
     pub fn id(self) -> ResTableRef {
         self.id
     }
diff --git a/mvn/src/package.rs b/mvn/src/package.rs
index 01b72040..df6fa2b7 100644
--- a/mvn/src/package.rs
+++ b/mvn/src/package.rs
@@ -143,7 +143,7 @@ pub struct Artifact<'a> {
     pub version: &'a Version,
 }
 
-impl<'a> Artifact<'a> {
+impl Artifact<'_> {
     pub fn file_name(self, ext: &str) -> String {
         format!(
             "{}-{}-{}.{}",
@@ -163,7 +163,7 @@ impl<'a> Artifact<'a> {
     }
 }
 
-impl<'a> std::fmt::Display for Artifact<'a> {
+impl std::fmt::Display for Artifact<'_> {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         write!(
             f,
diff --git a/xbuild/Cargo.toml b/xbuild/Cargo.toml
index 24a7b7f9..06d2c85f 100644
--- a/xbuild/Cargo.toml
+++ b/xbuild/Cargo.toml
@@ -32,6 +32,7 @@ quick-xml = { version = "0.26.0", features = ["serialize"] }
 reqwest = { version = "0.11.13", default-features = false, features = ["blocking", "rustls-tls", "rustls-tls-native-roots"] }
 serde = { version = "1.0.151", features = ["derive"] }
 serde_yaml = "0.9.16"
+shlex = "1"
 symlink = "0.1.0"
 tar = "0.4.38"
 toml = "0.5.10"
diff --git a/xbuild/src/command/mod.rs b/xbuild/src/command/mod.rs
index b0926c6c..1cc67e92 100644
--- a/xbuild/src/command/mod.rs
+++ b/xbuild/src/command/mod.rs
@@ -26,10 +26,10 @@ pub fn devices() -> Result<()> {
     Ok(())
 }
 
-pub fn run(env: &BuildEnv) -> Result<()> {
+pub fn run(env: &BuildEnv, launch_args: &[String]) -> Result<()> {
     let out = env.executable();
     if let Some(device) = env.target().device() {
-        device.run(env, &out)?;
+        device.run(env, &out, launch_args)?;
     } else {
         anyhow::bail!("no device specified");
     }
diff --git a/xbuild/src/devices/adb.rs b/xbuild/src/devices/adb.rs
index db36b8a7..f6ce0309 100644
--- a/xbuild/src/devices/adb.rs
+++ b/xbuild/src/devices/adb.rs
@@ -129,7 +129,17 @@ impl Adb {
     }
 
     /// To run a native activity use "android.app.NativeActivity" as the activity name
-    fn start(&self, device: &str, package: &str, activity: &str) -> Result<()> {
+    fn start(
+        &self,
+        device: &str,
+        package: &str,
+        activity: &str,
+        launch_args: &[String],
+    ) -> Result<()> {
+        // Quote arguments for `am` so that they don't already get parsed by `adb`.
+        let launch_args = shlex::try_join(launch_args.iter().map(String::as_str))
+            .context("Failed to re-quote launch arguments")?;
+
         let status = self
             .shell(device, None)
             .arg("am")
@@ -138,6 +148,7 @@ impl Adb {
             .arg("android.intent.action.MAIN")
             .arg("-n")
             .arg(format!("{}/{}", package, activity))
+            .arg(launch_args)
             .status()?;
         anyhow::ensure!(
             status.success(),
@@ -373,6 +384,7 @@ impl Adb {
         &self,
         device: &str,
         path: &Path,
+        launch_args: &[String],
         debug_config: &AndroidDebugConfig,
         debug: bool,
     ) -> Result<()> {
@@ -388,7 +400,7 @@ impl Adb {
         self.install(device, path)?;
         self.forward_reverse(device, debug_config)?;
         let last_timestamp = self.logcat_last_timestamp(device)?;
-        self.start(device, package, activity)?;
+        self.start(device, package, activity, launch_args)?;
         let uid = self.uidof(device, package)?;
         let logcat = self.logcat(device, uid, &last_timestamp)?;
         for line in logcat {
diff --git a/xbuild/src/devices/host.rs b/xbuild/src/devices/host.rs
index fe4dcce8..dc38b885 100644
--- a/xbuild/src/devices/host.rs
+++ b/xbuild/src/devices/host.rs
@@ -46,8 +46,8 @@ impl Host {
         }
     }
 
-    pub fn run(&self, path: &Path) -> Result<()> {
-        Command::new(path).status()?;
+    pub fn run(&self, path: &Path, launch_args: &[String]) -> Result<()> {
+        Command::new(path).args(launch_args).status()?;
         Ok(())
     }
 
diff --git a/xbuild/src/devices/imd.rs b/xbuild/src/devices/imd.rs
index 9e2dee74..b6e49a35 100644
--- a/xbuild/src/devices/imd.rs
+++ b/xbuild/src/devices/imd.rs
@@ -48,12 +48,13 @@ impl IMobileDevice {
         Ok(())
     }
 
-    fn start(&self, device: &str, bundle_identifier: &str) -> Result<()> {
+    fn start(&self, device: &str, bundle_identifier: &str, launch_args: &[String]) -> Result<()> {
         let status = Command::new(&self.idevicedebug)
             .arg("--udid")
             .arg(device)
             .arg("run")
             .arg(bundle_identifier)
+            .args(launch_args)
             .status()?;
         anyhow::ensure!(status.success(), "failed to run idevicedebug");
         Ok(())
@@ -92,11 +93,17 @@ impl IMobileDevice {
         Ok(())
     }
 
-    pub fn run(&self, env: &BuildEnv, device: &str, path: &Path) -> Result<()> {
+    pub fn run(
+        &self,
+        env: &BuildEnv,
+        device: &str,
+        path: &Path,
+        launch_args: &[String],
+    ) -> Result<()> {
         let bundle_identifier = appbundle::app_bundle_identifier(path)?;
         self.mount_disk_image(env, device)?;
         self.install(device, path)?;
-        self.start(device, &bundle_identifier)?;
+        self.start(device, &bundle_identifier, launch_args)?;
         Ok(())
     }
 
diff --git a/xbuild/src/devices/mod.rs b/xbuild/src/devices/mod.rs
index 7b8f91e3..9ad1439d 100644
--- a/xbuild/src/devices/mod.rs
+++ b/xbuild/src/devices/mod.rs
@@ -110,11 +110,17 @@ impl Device {
         }
     }
 
-    pub fn run(&self, env: &BuildEnv, path: &Path) -> Result<()> {
+    pub fn run(&self, env: &BuildEnv, path: &Path, launch_args: &[String]) -> Result<()> {
         match &self.backend {
-            Backend::Adb(adb) => adb.run(&self.id, path, &env.config.android().debug, false),
-            Backend::Host(host) => host.run(path),
-            Backend::Imd(imd) => imd.run(env, &self.id, path),
+            Backend::Adb(adb) => adb.run(
+                &self.id,
+                path,
+                launch_args,
+                &env.config.android().debug,
+                false,
+            ),
+            Backend::Host(host) => host.run(path, launch_args),
+            Backend::Imd(imd) => imd.run(env, &self.id, path, launch_args),
         }?;
         Ok(())
     }
diff --git a/xbuild/src/download.rs b/xbuild/src/download.rs
index d40d53de..f7623fc6 100644
--- a/xbuild/src/download.rs
+++ b/xbuild/src/download.rs
@@ -15,7 +15,7 @@ pub struct DownloadManager<'a> {
     client: Client,
 }
 
-impl<'a> Download for DownloadManager<'a> {
+impl Download for DownloadManager<'_> {
     fn download(&self, url: &str, dest: &Path) -> Result<()> {
         let pb = ProgressBar::with_draw_target(Some(0), ProgressDrawTarget::stdout())
         .with_style(
@@ -234,7 +234,7 @@ impl WorkItem {
     }
 }
 
-impl<'a> DownloadManager<'a> {
+impl DownloadManager<'_> {
     pub fn android_jar(&self) -> Result<()> {
         let dir = self.env.android_sdk();
         let sdk = self.env.target_sdk_version();
diff --git a/xbuild/src/gradle/mod.rs b/xbuild/src/gradle/mod.rs
index 64da664a..ecb2574e 100644
--- a/xbuild/src/gradle/mod.rs
+++ b/xbuild/src/gradle/mod.rs
@@ -80,7 +80,7 @@ pub fn build(env: &BuildEnv, libraries: Vec<(Target, PathBuf)>, out: &Path) -> R
 
         let external_lib = format!(r#"task.dexDirs.from("{path}")"#);
         dexes.push_str(&external_lib);
-        dexes.push_str("\n");
+        dexes.push('\n');
     }
 
     let dexes = if !dexes.is_empty() {
diff --git a/xbuild/src/main.rs b/xbuild/src/main.rs
index 9e1acfdf..e820349e 100644
--- a/xbuild/src/main.rs
+++ b/xbuild/src/main.rs
@@ -46,6 +46,16 @@ enum Commands {
     Run {
         #[clap(flatten)]
         args: BuildArgs,
+
+        /// Platform-specific arguments to pass to the launch command:
+        /// - **Host**: Passed to the running executable, similar to `cargo run -- <launch_args>`.
+        /// - **Android**: Passed to [`am start`], after the `-a MAIN` and `-n package/.Activity` flags.
+        /// - **iOS**: Passed to [`idevicedebug`] after `run <bundleid>`.
+        ///
+        /// [`am start`]: https://developer.android.com/tools/adb#am
+        /// [`idevicedebug`]: https://manpages.debian.org/testing/libimobiledevice-utils/idevicedebug.1.en.html
+        #[clap(last = true)]
+        launch_args: Vec<String>,
     },
     /// Launch app in a debugger on an attached device
     Lldb {
@@ -104,10 +114,10 @@ impl Commands {
                 let env = BuildEnv::new(args)?;
                 command::build(&env)?;
             }
-            Self::Run { args } => {
+            Self::Run { args, launch_args } => {
                 let env = BuildEnv::new(args)?;
                 command::build(&env)?;
-                command::run(&env)?;
+                command::run(&env, &launch_args)?;
             }
             Self::Lldb { args } => {
                 let env = BuildEnv::new(args)?;