feat!: Android apk build support

Author: foxxcn

Cargo.lock

@@ -1309,6 +1309,7 @@ dependencies = [
 name = "egui_demo_app"
 version = "0.30.0"
 dependencies = [
+ "android_logger",
  "bytemuck",
  "chrono",
  "eframe",
@@ -1329,6 +1330,7 @@ dependencies = [
  "wasm-bindgen-futures",
  "web-sys",
  "wgpu",
+ "winit",
 ]
 
 [[package]]

crates/egui_demo_app/Cargo.toml

@@ -52,6 +52,8 @@ chrono = { version = "0.4", default-features = false, features = [
 ] }
 eframe = { workspace = true, default-features = false, features = [
   "web_screen_reader",
+  # Android support
+  "android-native-activity",
 ] }
 egui = { workspace = true, features = ["callstack", "default", "log"] }
 egui_demo_lib = { workspace = true, features = ["default", "chrono"] }
@@ -79,6 +81,9 @@ poll-promise = { version = "0.3", optional = true, default-features = false }
 # feature "persistence":
 serde = { workspace = true, optional = true }
 
+[target.'cfg(target_os = "android")'.dependencies]
+winit = { workspace = true }
+android_logger = "0.14"
 
 # native:
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
@@ -93,3 +98,6 @@ rfd = { version = "0.15", optional = true }
 wasm-bindgen = "=0.2.95"
 wasm-bindgen-futures.workspace = true
 web-sys.workspace = true
+
+[package.metadata.android]
+build_targets = ["armv7-linux-androideabi", "aarch64-linux-android"]

crates/egui_demo_app/src/lib.rs

@@ -6,6 +6,9 @@ mod backend_panel;
 mod frame_history;
 mod wrap_app;
 
+#[cfg(target_os = "android")]
+use winit::platform::android::activity::AndroidApp;
+
 pub use wrap_app::WrapApp;
 
 /// Time of day as seconds since midnight. Used for clock in demo app.
@@ -22,3 +25,31 @@ mod web;
 
 #[cfg(target_arch = "wasm32")]
 pub use web::*;
+
+// ----------------------------------------------------------------------------
+// Android entry point
+#[cfg(target_os = "android")]
+#[no_mangle]
+#[allow(unsafe_code)]
+pub fn android_main(app: AndroidApp) {
+    android_logger::init_once(
+        android_logger::Config::default()
+            .with_max_level(log::LevelFilter::Info)
+            .with_tag("egui_demo_app"),
+    );
+
+    let options = eframe::NativeOptions {
+        viewport: egui::ViewportBuilder::default()
+            .with_inner_size([1280.0, 1024.0])
+            .with_drag_and_drop(true),
+        android_app: Some(app),
+        ..Default::default()
+    };
+
+    eframe::run_native(
+        "egui demo app",
+        options,
+        Box::new(|cc| Ok(Box::new(crate::WrapApp::new(cc)))),
+    )
+    .unwrap();
+}