feat: 添加自动填充阻止功能，优化用户隐私保护

android/app/src/main/kotlin/io/openim/flutter/openim/MainActivity.kt

@@ -13,6 +13,8 @@ import android.os.Build
 import android.provider.MediaStore
 import android.util.Base64
 import android.util.Log
+import android.view.View
+import android.view.ViewGroup
 import androidx.core.content.FileProvider
 import io.flutter.embedding.android.FlutterActivity
 import org.conscrypt.Conscrypt
@@ -41,6 +43,12 @@ class MainActivity : FlutterActivity() {
             Log.w(TAG, "Conscrypt provider install failed: ${e.message}")
         }
         super.onCreate(savedInstanceState)
+        installAutofillBlocker()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        disableAutofillForCurrentWindow()
     }
 
     override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
@@ -264,6 +272,36 @@ class MainActivity : FlutterActivity() {
         )
     }
 
+    private fun installAutofillBlocker() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            return
+        }
+
+        disableAutofillForCurrentWindow()
+        window.decorView.viewTreeObserver.addOnGlobalLayoutListener {
+            disableAutofillForCurrentWindow()
+        }
+    }
+
+    private fun disableAutofillForCurrentWindow() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            return
+        }
+        disableAutofill(window.decorView)
+    }
+
+    private fun disableAutofill(view: View) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            view.importantForAutofill = View.IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS
+        }
+
+        if (view is ViewGroup) {
+            for (index in 0 until view.childCount) {
+                disableAutofill(view.getChildAt(index))
+            }
+        }
+    }
+
     private fun normalizeMimeTypes(acceptTypes: List<String>): List<String> {
         val mimeTypes = linkedSetOf<String>()
         acceptTypes