切换页面或锁屏时关闭串口电源

lib/pages/compass_page.dart

@@ -7,6 +7,7 @@ import 'package:fengshui_compass/components/my_icon.dart';
 import 'package:fengshui_compass/pages/login_page.dart';
 import 'package:fengshui_compass/states/region.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_serial_port_api/flutter_serial_port_api.dart';
 import 'package:image_picker/image_picker.dart';
 import 'package:provider/provider.dart';
@@ -23,7 +24,7 @@ class CompassPage extends StatefulWidget {
   State<StatefulWidget> createState() => _CompassState();
 }
 
-class _CompassState extends State<CompassPage> {
+class _CompassState extends State<CompassPage> with WidgetsBindingObserver {
   // 串口相关
   bool isPortOpened = false;
   SerialPort _serialPort;
@@ -54,16 +55,53 @@ class _CompassState extends State<CompassPage> {
   @override
   void initState() {
     super.initState();
+    print("init");
+    // 添加观察者以监听生命周期事件
+    WidgetsBinding.instance?.addObserver(this);
     initPort();
   }
 
+  @override
+  void dispose() {
+    turnOffPower();
+    // 在小部件被销毁时移除观察者，以防止内存泄漏
+    WidgetsBinding.instance?.removeObserver(this);
+    super.dispose();
+    print("dispose");
+  }
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    // 在这里处理应用程序生命周期状态变化事件
+    if (state == AppLifecycleState.paused) {
+      // 应用程序进入后台
+      print('App entered background');
+      turnOffPower();
+    } else if (state == AppLifecycleState.resumed) {
+      // 应用程序回到前台
+      print('App returned to foreground');
+      initPort();
+    } else if (state == AppLifecycleState.inactive) {
+      // 应用程序处于非活动状态（例如：锁屏、电话来电）
+      print('App in inactive state');
+      turnOffPower();
+    }
+  }
+
   Future<void> initPort() async {
+    await turnOnPower();
+    // todo:
+    setState(() {
+      isLock = true;
+      isUpClose = true;
+      isSideClose = true;
+    });
     // 20ms接收一次串口数据，防抖，定义接收缓存
     final debounceTransformer = StreamTransformer<Uint8List, dynamic>.fromBind(
         (s) => s.transform(debounceBuffer(const Duration(milliseconds: 20))));
 
     if (!isPortOpened) {
-      Device theDevice = Device("/dev/ttyS2", "/dev/ttyS2");
+      Device theDevice = Device("/dev/ttyS3", "/dev/ttyS3");
       var serialPort = await FlutterSerialPortApi.createSerialPort(
           theDevice, 115200,
           parity: 0, dataBits: 8, stopBit: 1);
@@ -89,6 +127,24 @@ class _CompassState extends State<CompassPage> {
     }
   }
 
+  Future<void> turnOnPower() async {
+    const platform = MethodChannel('toggle_power');
+    await platform.invokeMethod("turnOnPower");
+  }
+
+  Future<void> turnOffPower() async {
+    const platform = MethodChannel('toggle_power');
+    await platform.invokeMethod("turnOffPower");
+    if (mounted) {
+      setState(() {
+        isLock = false;
+        isUpClose = false;
+        isSideClose = false;
+        isPortOpened = false;
+      });
+    }
+  }
+
   Future<void> closePort() async {
     bool closeResult = await _serialPort.close();
     setState(() {
@@ -204,40 +260,50 @@ class _CompassState extends State<CompassPage> {
         w_y_tmp = 0.5 - 0.07 * roll_tmp / 30.0;
         w_x_tmp = 0.5 - 0.07 * pitch_tmp / 30.0;
       } else if (w_total > 30) {
-        //todo
-        w_y_tmp = 0.5 - 0.07 * w_total / 30.0;
-        w_x_tmp = 0.5 - 0.07 * w_total / 30.0;
+        // //todo
+        // w_y_tmp = 0.5 - 0.07 * w_total / 30.0;
+        // w_x_tmp = 0.5 - 0.07 * w_total / 30.0;
+        var radius = sqrt(0.07 * 0.07 * 2);
+        //todo;
+        var _angle = atan2(roll_tmp, -pitch_tmp);
+        if (_angle < 0) {
+          _angle += 2 * pi;
+        }
+        w_y_tmp = 0.5 - radius * sin(_angle);
+        w_x_tmp = 0.5 + radius * cos(_angle);
       }
 
       // todo 其他情况
 
       var meanValue;
 
-      if (lista.length < 20) {
-        lista.add(temp_myaw);
-        meanValue = null;
-      } else {
-        lista.removeAt(0);
-        lista.add(temp_myaw);
-        meanValue = lista.map((e) => e).reduce((a, b) => a + b) / lista.length;
+      // if (lista.length < 20) {
+      //   lista.add(temp_myaw);
+      //   meanValue = null;
+      // } else {
+      //   lista.removeAt(0);
+      //   lista.add(temp_myaw);
+      //   meanValue = lista.map((e) => e).reduce((a, b) => a + b) / lista.length;
+      // }
+
+      if (mounted) {
+        setState(() {
+          // print("roll: $roll_tmp pitch: $pitch_tmp");
+          // print("w_x: $w_x_tmp, w_y: $w_y_tmp");
+          // if (meanValue != null) {
+          //   myaw = meanValue;
+          // } else {
+          //   myaw = 0;
+          // }
+          myaw = temp_myaw;
+
+          w_x = w_x_tmp;
+          w_y = w_y_tmp;
+
+          // 水平仪 0.5+-0.07范围
+          // x旋转y在动 y旋转x在动 roll改变y坐标，pitch改变x坐标
+        });
       }
-
-      setState(() {
-        // print("roll: $roll_tmp pitch: $pitch_tmp");
-        // print("w_x: $w_x_tmp, w_y: $w_y_tmp");
-        // if (meanValue != null) {
-        //   myaw = meanValue;
-        // } else {
-        //   myaw = 0;
-        // }
-        myaw = temp_myaw;
-
-        w_x = w_x_tmp;
-        w_y = w_y_tmp;
-
-        // 水平仪 0.5+-0.07范围
-        // x旋转y在动 y旋转x在动 roll改变y坐标，pitch改变x坐标
-      });
     } else if (str.contains("9E010401") &&
         (str.length >= ((str.indexOf("9E010401") + 26)))) {
       var pos = str.indexOf("9E010401");
@@ -311,7 +377,8 @@ class _CompassState extends State<CompassPage> {
     } else if (angle > 180) {
       result = angle - 180;
     } else {
-      result = 0.0;
+      // result = 0.0;
+      result = angle;
     }
     return result;
   }