针对readme部分做性能优化，目标帧率120达成

android/app/src/main/kotlin/com/lxh/battery_health/MainActivity.kt

@@ -11,6 +11,7 @@ import android.os.Build
 import android.os.Bundle
 import android.provider.DocumentsContract
 import android.provider.OpenableColumns
+import android.view.Window  // 🟢 必须包含
 import androidx.activity.ComponentActivity
 import androidx.annotation.NonNull
 import io.flutter.embedding.android.FlutterActivity
@@ -32,6 +33,9 @@ class MainActivity : FlutterActivity() {
     private val PREF_NAME = "battery_health_prefs"
     private val KEY_SAF_URI = "saf_uri"
 
+    // 🟢 刷新率控制通道
+    private val FRAME_RATE_CHANNEL = "com.lxh.battery_health/frame_rate"
+
     private val chargeReceiver = object : BroadcastReceiver() {
         override fun onReceive(context: Context?, intent: Intent?) {
             intent ?: return
@@ -74,7 +78,6 @@ class MainActivity : FlutterActivity() {
         try {
             safUri = Uri.parse(uriString)
             android.util.Log.d("BatteryHealth", "通过 MethodChannel 恢复 URI: $safUri")
-            // 同时保存到 SharedPreferences
             val prefs: SharedPreferences = getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE)
             prefs.edit().putString(KEY_SAF_URI, uriString).apply()
         } catch (e: Exception) {
@@ -222,9 +225,34 @@ class MainActivity : FlutterActivity() {
         return fileUri?.let { readFile(it) }
     }
 
+// 🟢 刷新率控制方法
+// 🟢 刷新率控制方法（使用 preferredRefreshRate，兼容性更好）
+private fun setHighRefreshRate() {
+    try {
+        val params = window.attributes
+        params.preferredRefreshRate = 120f
+        window.attributes = params
+        android.util.Log.d("BatteryHealth", "setHighRefreshRate: 设置 120Hz")
+    } catch (e: Exception) {
+        android.util.Log.e("BatteryHealth", "setHighRefreshRate 失败: ${e.message}")
+    }
+}
+
+private fun clearRefreshRate() {
+    try {
+        val params = window.attributes
+        params.preferredRefreshRate = 0f  // 0 表示让系统自动决定
+        window.attributes = params
+        android.util.Log.d("BatteryHealth", "clearRefreshRate: 恢复默认")
+    } catch (e: Exception) {
+        android.util.Log.e("BatteryHealth", "clearRefreshRate 失败: ${e.message}")
+    }
+}
+
     override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
         super.configureFlutterEngine(flutterEngine)
 
+        // 充电状态通道
         MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHARGE_CHANNEL)
             .setMethodCallHandler { call, result ->
                 if (call.method == "getChargeState") {
@@ -247,6 +275,7 @@ class MainActivity : FlutterActivity() {
                 }
             }
 
+        // SAF 通道
         MethodChannel(flutterEngine.dartExecutor.binaryMessenger, SAF_CHANNEL)
             .setMethodCallHandler { call, result ->
                 when (call.method) {
@@ -283,6 +312,23 @@ class MainActivity : FlutterActivity() {
                 }
             }
 
+        // 🟢 刷新率控制通道
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, FRAME_RATE_CHANNEL)
+            .setMethodCallHandler { call, result ->
+                when (call.method) {
+                    "setHighRefreshRate" -> {
+                        setHighRefreshRate()
+                        result.success(true)
+                    }
+                    "clearRefreshRate" -> {
+                        clearRefreshRate()
+                        result.success(true)
+                    }
+                    else -> result.notImplemented()
+                }
+            }
+
+        // 事件通道
         EventChannel(flutterEngine.dartExecutor.binaryMessenger, EVENT_CHANNEL)
             .setStreamHandler(
                 object : EventChannel.StreamHandler {