Fix the compatibility issue with Android 12

rsbinder/src/binder.rs

@@ -282,21 +282,22 @@ pub enum Stability {
 impl From<Stability> for i32 {
     fn from(stability: Stability) -> i32 {
         use Stability::*;
-        if crate::is_new_stability() {
-            match stability {
-                Local => 0,
-                Vendor => 0x0c000003,
-                System => 0x0c00000c,
-                Vintf => 0x0c00003f,
-            }
+
+        let stability = match stability {
+            Local => 0,
+            Vendor => 0b000011,
+            System => 0b001100,
+            Vintf => 0b111111,
+        };
+
+        #[cfg(target_os = "android")]
+        if crate::get_android_version() == 12 {
+            stability | 0x0c000000
         } else {
-            match stability {
-                Local => 0,
-                Vendor => 0b000011,
-                System => 0b001100,
-                Vintf => 0b111111,
-            }
+            stability
         }
+        #[cfg(not(target_os = "android"))]
+        stability
     }
 }
 

rsbinder/src/lib.rs

@@ -55,24 +55,24 @@ pub const DEFAULT_BINDER_CONTROL_PATH: &str = "/dev/binderfs/binder-control";
 pub const DEFAULT_BINDER_PATH: &str = "/dev/binderfs/binder";
 pub const DEFAULT_BINDERFS_PATH: &str = "/dev/binderfs";
 
+
 #[cfg(target_os = "android")]
 static ANDROID_VERSION: std::sync::OnceLock<i32> = std::sync::OnceLock::new();
 
 /// Set the Android version for compatibility.
+/// There are compatibility issues with Binder IPC depending on the Android version.
+/// The current findings indicate there are compatibility issues before and after Android 12.
+/// If your software needs to work on both Android 11 and 12,
+/// you must set the Android version using the rsbinder::set_android_version() API.
 #[cfg(target_os = "android")]
 pub fn set_android_version(version: i32) {
     ANDROID_VERSION.set(version).expect("Android version is already set.");
 }
 
-/// Get binder stability version.
-pub fn is_new_stability() -> bool {
-    #[cfg(target_os = "android")]
-    match ANDROID_VERSION.get() {
-        Some(version) => *version == 12,
-        None => false,   // Support the latest version by default.
-    }
-    #[cfg(not(target_os = "android"))]
-    false
+/// Get the Android version.
+#[cfg(target_os = "android")]
+pub fn get_android_version() -> i32 {
+    *ANDROID_VERSION.get().unwrap_or(&0)
 }
 
 #[cfg(test)]