diff --git a/src/android/app.rs b/src/android/app.rs
index e3c518b..287f6ba 100644
--- a/src/android/app.rs
+++ b/src/android/app.rs
@@ -265,8 +265,8 @@ pub fn test() {
     let act2 = act.clone();
     let runnable = RunnableImpl::from_fn(move || {
         act2.set_content_view(&edit);
-    })
-    .unwrap();
+        Ok(())
+    }).unwrap();
     act.run_on_ui_thread(runnable.as_ref());
     let wm: WindowManagerImpl = act.get_window_manager();
     assert!(wm.to_string().starts_with("android.view.WindowManagerImpl"));
diff --git a/utils/src/lib.rs b/utils/src/lib.rs
index fef20ed..4b330e0 100644
--- a/utils/src/lib.rs
+++ b/utils/src/lib.rs
@@ -284,6 +284,35 @@ macro_rules! impl_array {
             const OBJECT_SIG: &'static str = <String as JType>::OBJECT_SIG;
             const DIM: u8 = $dim;
         }
+
+        // 为 String 类型实现必要的 trait
+        impl JType for String {
+            const CLASS: &'static str = "java/lang/String";
+            const OBJECT_SIG: &'static str = "Ljava/lang/String;";
+        }
+
+        impl JObjRef for String {
+            fn java_ref(&self) -> Result<GlobalRef> {
+                let mut env = vm_attach()?;
+                let jstring = env.new_string(self)?;
+                Ok(env.new_global_ref(&jstring)?)
+            }
+        }
+
+        impl JObjNew for String {
+            type Fields = ();
+
+            fn _new(this: &GlobalRef, _fields: Self::Fields) -> Result<Self> {
+                if this.is_null() {
+                    return Ok(String::new());
+                }
+
+                let mut env = vm_attach()?;
+                let jstring = this.as_obj();
+                let java_string = env.get_string(jstring.into())?;
+                Ok(java_string.to_str()?.to_string())
+            }
+        }
     };
 
     (u8, $dim:expr) => {