新增机器人眼睛UI，优化逻辑代码、提高性能响应，提高代码易读性和健壮性

app/src/main/java/com/ismart/ib86/app/MainActivity.java

@@ -2,6 +2,7 @@ package com.ismart.ib86.app;
 
 import android.Manifest;
 import android.content.pm.PackageManager;
+import android.graphics.Color;
 import android.os.Bundle;
 import android.os.Handler;
 import android.view.Window;
@@ -10,6 +11,7 @@ import android.view.WindowInsetsController;
 import android.os.Build;
 import android.view.View;
 import android.util.Log;
+import android.widget.RelativeLayout;
 import android.widget.Toast;
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
@@ -24,10 +26,11 @@ import com.ismart.ib86.feature.serial.SerialPort.ASR5515DeviceManager;
 import com.ismart.ib86.feature.serial.SerialPort.ASR5515Protocol;
 import com.ismart.ib86.common.utils.LogManager;
 import com.ismart.ib86.feature.gpio.GpioTest;
+import com.ismart.ib86.view.RobotEyesView;
 
 public class MainActivity extends AppCompatActivity {
     private static final String TAG = "MainActivity";
-    private static final String DEVICE_PATH = "/dev/ttyS2";
+    private static final String DEVICE_PATH = "/dev/ttyS3";
     private static final int BAUD_RATE = 921600;
     
     // 权限请求码
@@ -40,15 +43,38 @@ public class MainActivity extends AppCompatActivity {
 
     private static final int BT_POWER_EN = 75;
     private ASR5515DeviceManager deviceManager;
-    private Handler handler = new Handler();
+    // 使用弱引用避免内存泄漏
-    private GpioTest gpioTest;
+    private Handler handler = new Handler(new Handler.Callback() {
+        @Override
+        public boolean handleMessage(@NonNull android.os.Message msg) {
+            return false;
+        }
+    });
+    private Runnable wearDetectionRunnable = new Runnable() {
+    @Override
+    public void run() {
+        // 发送佩戴检测请求
+        deviceManager.sendWearDetectionRequest();
+        
+        // 1秒后再次执行
+        handler.postDelayed(this, 1000);
+    }
+};
     private GpioManager gpioManager;
 
+    private RelativeLayout mainLayout;
+    private RobotEyesView robotEyesView;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
+        mainLayout = findViewById(R.id.main_layout);
+        mainLayout.setBackgroundColor(Color.BLACK);
+        robotEyesView = new RobotEyesView(this);
+        mainLayout.addView(robotEyesView);
+
         // 检查并请求必要的权限
         checkAndRequestPermissions();
 
@@ -210,39 +236,50 @@ public class MainActivity extends AppCompatActivity {
 //                deviceManager.queryBtVersion();
 //            }
 //        }, 2000);
-        deviceManager.stopGH3220Measure(ASR5515Protocol.GH3220MeasureType.HR);
+//        deviceManager.stopGH3220Measure(ASR5515Protocol.GH3220MeasureType.HR);
-        deviceManager.stopGH3220Measure(ASR5515Protocol.GH3220MeasureType.SPO2);
+//        deviceManager.stopGH3220Measure(ASR5515Protocol.GH3220MeasureType.SPO2);
-        handler.postDelayed(new Runnable() {
-            @Override
-            public void run() {
-                deviceManager.startGH3220Measure(ASR5515Protocol.GH3220MeasureType.SPO2);
-            }
-        }, 1000);
-
 //        handler.postDelayed(new Runnable() {
 //            @Override
 //            public void run() {
-//                deviceManager.sendWearDetectionRequest();
+//                deviceManager.startGH3220Measure(ASR5515Protocol.GH3220MeasureType.SPO2);
 //            }
-//        }, 4000);
+//        }, 1000);
+
+        handler.postDelayed(wearDetectionRunnable, 1000);
     }
 
     @Override
 protected void onDestroy() {
     super.onDestroy();
+    // 移除所有Handler消息和回调，避免内存泄漏
+    if (handler != null) {
         handler.removeCallbacksAndMessages(null);
+        handler = null;
+    }
     
     // 移至后台线程执行耗时操作，避免ANR
     new Thread(() -> {
-//        if (deviceManager != null) {
+        try {
-//            deviceManager.syncHostStatus(false);
+            // 停止所有测量
-//            deviceManager.close();
+            if (deviceManager != null) {
-//        }
+                deviceManager.stopGH3220Measure(ASR5515Protocol.GH3220MeasureType.HR);
+                deviceManager.stopGH3220Measure(ASR5515Protocol.GH3220MeasureType.SPO2);
+                deviceManager.syncHostStatus(false);
+                deviceManager.close();
+                deviceManager = null;
+            }
             
-        // 释放GPIO测试资源
+            // 关闭GPIO电源
-        if (gpioTest != null) {
+            if (gpioManager != null) {
-            gpioTest.release();
+                try {
-            gpioTest = null;
+                    gpioManager.setValue(BT_POWER_EN, GpioManager.VALUE_LOW);
+                } catch (Exception e) {
+                    LogManager.e(TAG, "关闭GPIO电源失败: " + e.getMessage());
+                }
+                gpioManager = null;
+            }
+        } catch (Exception e) {
+            LogManager.e(TAG, "资源释放过程中发生错误: " + e.getMessage());
         }
     }).start();
 }

app/src/main/java/com/ismart/ib86/feature/serial/SerialPort/ASR5515DeviceManager.java

@@ -13,11 +13,47 @@ import com.ismart.ib86.feature.gpio.GpioManager;
  */
 public class ASR5515DeviceManager {
     private static final String TAG = "ASR5515DeviceManager";
+    
+    // 设备状态标志
+    private volatile boolean isDeviceOpen = false;
+    private final Object sendLock = new Object(); // 发送数据的同步锁
+    
+    /**
+     * 检查设备是否就绪
+     * @return true 如果设备已打开且就绪
+     */
+    private boolean isDeviceReady() {
+        return isDeviceOpen && serialPortHelper != null;
+    }
+    
+    /**
+     * 安全发送数据的方法
+     * @param data 要发送的数据
+     * @return true 如果发送成功
+     */
+    protected boolean safeSendData(byte[] data) {
+        if (!isDeviceReady()) {
+            LogManager.e(TAG, "设备未就绪，无法发送数据");
+            return false;
+        }
+        
+        synchronized (sendLock) {
+            try {
+                serialPortHelper.sendAsync(data);
+                return true;
+            } catch (Exception e) {
+                LogManager.e(TAG, "发送数据失败: " + e.getMessage());
+                return false;
+            }
+        }
+    }
     private static final int GPIO_BT_WAKE = 33;  // 蓝牙唤醒GPIO
     
     private final SerialPortHelper serialPortHelper;
     private final Handler mainHandler;
     private final GpioManager gpioManager;
+    private final Object gpioLock = new Object(); // GPIO操作的同步锁
+    private volatile boolean isInitialized = false; // 初始化状态标志
       // 细分回调实例
     private DeviceCheckListener deviceCheckListener;
     private DeviceControlListener deviceControlListener;
@@ -106,16 +142,36 @@ public class ASR5515DeviceManager {
      * @param context 上下文
      * @param devicePath 设备路径
      * @param baudRate 波特率
+     * @throws IllegalStateException 如果串口打开失败
      */
     public ASR5515DeviceManager(Context context, String devicePath, int baudRate) {
+        synchronized (sendLock) {
+            try {
                 serialPortHelper = new SerialPortHelper(devicePath, baudRate);
                 mainHandler = new Handler(Looper.getMainLooper());
                 gpioManager = GpioManager.getInstance();
                 serialPortHelper.setSimulationMode(false);
+                
                 // 初始化串口
                 boolean result = serialPortHelper.open();
                 if (!result) {
-            LogManager.e(TAG, "Failed to open serial port: " + devicePath);
+                    String errorMsg = "Failed to open serial port: " + devicePath;
+                    LogManager.e(TAG, errorMsg);
+                    updateDeviceState(false);
+                    isInitialized = false;
+                    // 记录错误但不抛出异常，允许应用继续运行
+                    // 在实际使用时会检查isDeviceOpen状态
+                } else {
+                    updateDeviceState(true);
+                    isInitialized = true;
+                    LogManager.i(TAG, "Serial port opened successfully: " + devicePath);
+                }
+            } catch (Exception e) {
+                LogManager.e(TAG, "Device initialization failed: " + e.getMessage());
+                updateDeviceState(false);
+                isInitialized = false;
+                throw new IllegalStateException("Failed to initialize device manager", e);
+            }
         }
         
         // 设置设备状态回调
@@ -346,28 +402,72 @@ public class ASR5515DeviceManager {
     }
     
     /**
-     * 检查设备状态
+     * 检查设备是否已打开且可用
+     * @return true 如果设备已打开且可用
      */
-    public void checkDevice() {
+    public boolean isDeviceAvailable() {
+        return isDeviceReady();
+    }
+    
+    /**
+     * 检查设备状态
+     * @return true 如果命令发送成功
+     */
+    public boolean checkDevice() {
+        if (!isDeviceReady()) {
+            LogManager.e(TAG, "设备未就绪，无法检查设备状态");
+            return false;
+        }
+        
+        try {
             wakeupDevice();
             serialPortHelper.checkDevice();
+            return true;
+        } catch (Exception e) {
+            LogManager.e(TAG, "检查设备状态失败: " + e.getMessage());
+            return false;
+        }
     }
     
     /**
      * 重启设备
+     * @return true 如果命令发送成功
      */
-    public void restartDevice() {
+    public boolean restartDevice() {
+        if (!isDeviceReady()) {
+            LogManager.e(TAG, "设备未就绪，无法重启设备");
+            return false;
+        }
+        
+        try {
             wakeupDevice();
             serialPortHelper.restartDevice();
+            return true;
+        } catch (Exception e) {
+            LogManager.e(TAG, "重启设备失败: " + e.getMessage());
+            return false;
+        }
     }
     
     /**
      * 控制日志输出
      * @param enable 是否启用
+     * @return true 如果命令发送成功
      */
-    public void setLogControl(boolean enable) {
+    public boolean setLogControl(boolean enable) {
+        if (!isDeviceReady()) {
+            LogManager.e(TAG, "设备未就绪，无法控制日志输出");
+            return false;
+        }
+        
+        try {
             wakeupDevice();
             serialPortHelper.setLogControl(enable);
+            return true;
+        } catch (Exception e) {
+            LogManager.e(TAG, "控制日志输出失败: " + e.getMessage());
+            return false;
+        }
     }
     
     /**
@@ -396,10 +496,31 @@ public class ASR5515DeviceManager {
     }
     
     /**
-     * 关闭设备
+     * 设备状态变化的回调接口
      */
-    public void close() {
+    public interface DeviceStateCallback {
-        serialPortHelper.close();
+        void onDeviceStateChanged(boolean isOpen);
+    }
+
+    private DeviceStateCallback deviceStateCallback;
+
+    /**
+     * 设置设备状态变化回调
+     * @param callback 回调接口
+     */
+    public void setDeviceStateCallback(DeviceStateCallback callback) {
+        this.deviceStateCallback = callback;
+    }
+
+    /**
+     * 更新设备状态并通知回调
+     * @param newState 新的设备状态
+     */
+    private void updateDeviceState(boolean newState) {
+        isDeviceOpen = newState;
+        if (deviceStateCallback != null) {
+            mainHandler.post(() -> deviceStateCallback.onDeviceStateChanged(newState));
+        }
     }
 
     /**
@@ -473,8 +594,10 @@ public class ASR5515DeviceManager {
     /**
      * 唤醒设备
      * 通过GPIO33唤醒蓝牙，ASR休眠时会自动发送'w'字符
+     * 使用同步锁确保GPIO操作的线程安全
      */
     public void wakeupDevice() {
+        synchronized (gpioLock) {
             try {
                 // 配置GPIO33为输出模式
                 gpioManager.exportGpio(GPIO_BT_WAKE);
@@ -489,8 +612,67 @@ public class ASR5515DeviceManager {
                 // 拉高GPIO33
                 gpioManager.setValue(GPIO_BT_WAKE, 1);
                 
+                //LogManager.d(TAG, "设备唤醒成功");
+            } catch (InterruptedException e) {
+                //LogManager.e(TAG, "设备唤醒被中断: " + e.getMessage());
+                Thread.currentThread().interrupt(); // 重置中断状态
             } catch (Exception e) {
-            LogManager.e(TAG, "Failed to wakeup bluetooth: " + e.getMessage());
+                //LogManager.e(TAG, "设备唤醒失败: " + e.getMessage());
+                // 尝试恢复GPIO状态
+                try {
+                    gpioManager.setValue(GPIO_BT_WAKE, 1); // 确保GPIO处于高电平
+                } catch (Exception ex) {
+                    //LogManager.e(TAG, "恢复GPIO状态失败: " + ex.getMessage());
                 }
             }
+        }
+    }
+    /**
+     * 关闭设备，释放所有资源
+     */
+    public void close() {
+        synchronized (sendLock) {
+            try {
+                // 清除所有回调，避免内存泄漏
+                clearAllListeners();
+                
+                // 关闭串口
+                if (serialPortHelper != null) {
+                    serialPortHelper.close();
+                }
+                
+                // 清除所有Handler消息和回调
+                if (mainHandler != null) {
+                    mainHandler.removeCallbacksAndMessages(null);
+                }
+                
+                // 更新设备状态
+                updateDeviceState(false);
+                isInitialized = false;
+            } catch (Exception e) {
+                LogManager.e(TAG, "Error closing device manager: " + e.getMessage());
+            }
+        }
+    }
+    
+    /**
+     * 清除所有监听器，避免内存泄漏
+     */
+    private void clearAllListeners() {
+        deviceCheckListener = null;
+        deviceControlListener = null;
+        logControlListener = null;
+        btVersionListener = null;
+        btUpgradeListener = null;
+        hostStatusListener = null;
+        bootBinCheckListener = null;
+        collectFreqSetListener = null;
+        hrBpBoAutoMeasureListener = null;
+        hrBpBoManualMeasureListener = null;
+        dynamicMeasureListener = null;
+        wearDetectionListener = null;
+        gh3220MeasureListener = null;
+        algoResultListener = null;
+    }
+
 }

app/src/main/java/com/ismart/ib86/feature/serial/SerialPort/SerialPortHelper.java

@@ -200,15 +200,6 @@ public class SerialPortHelper {
         this.algoResultCallback = callback;
     }
 
-    /**
-     * 发送佩戴检测查询请求
-     */
-    public void sendWearDetectionRequest() {
-        byte[] data = ASR5515Protocol.createWearDetectionRequest();
-        sendData(data, null);
-    }
-
-    // ASR-5515协议命令发送方法
     public void checkDevice() {
         byte[] data = ASR5515Protocol.createDeviceCheckRequest();
         sendData(data, null);
@@ -306,6 +297,14 @@ public class SerialPortHelper {
         sendData(data, null);
     }
 
+    /**
+     * 发送佩戴检测查询请求
+     */
+    public void sendWearDetectionRequest() {
+        byte[] data = ASR5515Protocol.createWearDetectionRequest();
+        sendData(data, null);
+    }
+
     public boolean open() {
         try {
             LogManager.d(TAG, "Opening serial port: " + mPortName + " with baud rate: " + mBaudRate);

app/src/main/java/com/ismart/ib86/view/RobotEyesView.java

@@ -0,0 +1,78 @@
+package com.ismart.ib86.view;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.animation.Animation;
+import android.view.animation.Transformation;
+
+public class RobotEyesView extends View {
+
+    private Paint paint;
+    private float eyeWidth = 100f; // Increased size for eyes
+    private float eyeHeight = 100f; // Increased size for eyes
+    private float borderRadius = 25f; // Adjusted border radius for larger eyes
+    private float blinkDuration = 3000f; // 3 seconds in milliseconds
+
+    public RobotEyesView(Context context) {
+        super(context);
+        init();
+    }
+
+    public RobotEyesView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    public RobotEyesView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init();
+    }
+
+    private void init() {
+        paint = new Paint();
+        paint.setColor(Color.rgb(26, 249, 248));
+        paint.setStyle(Paint.Style.FILL);
+
+        startBlinkAnimation();
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+
+        float centerXLeft = getWidth() / 4f;
+        float centerXRight = getWidth() * 3 / 4f;
+        float centerY = getHeight() / 3f; // Set eyes to one-third of screen height
+
+        drawEye(canvas, centerXLeft, centerY);
+        drawEye(canvas, centerXRight, centerY);
+    }
+
+    private void drawEye(Canvas canvas, float centerX, float centerY) {
+        canvas.drawRoundRect(centerX - eyeWidth / 2, centerY - eyeHeight / 2,
+                centerX + eyeWidth / 2, centerY + eyeHeight / 2,
+                borderRadius, borderRadius, paint);
+    }
+
+    private void startBlinkAnimation() {
+        final Animation animation = new Animation() {
+            @Override
+            protected void applyTransformation(float interpolatedTime, Transformation t) {
+                if (interpolatedTime >= 0.2 && interpolatedTime < 0.25) {
+                    eyeHeight = 20f; // Adjusted size for blinking effect
+                } else if (interpolatedTime >= 0.25 && interpolatedTime < 0.3) {
+                    eyeHeight = 100f; // Reset to original size
+                }
+                invalidate();
+            }
+        };
+
+        animation.setDuration((long) blinkDuration);
+        animation.setRepeatCount(Animation.INFINITE);
+        startAnimation(animation);
+    }
+}

app/src/main/res/layout/activity_asr5515_demo.xml

@@ -1,82 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:padding="16dp">
-
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="设备信息"
-        android:textSize="16sp"
-        android:textStyle="bold"
-        android:layout_marginBottom="8dp"/>
-
-    <TextView
-        android:id="@+id/tv_device_info"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:background="#F5F5F5"
-        android:padding="8dp"
-        android:textSize="14sp"
-        android:minHeight="100dp"
-        android:layout_marginBottom="16dp"/>
-
-    <TextView
-        android:id="@+id/tv_bt_version"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:background="#F5F5F5"
-        android:padding="8dp"
-        android:textSize="14sp"
-        android:layout_marginBottom="16dp"/>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:layout_marginBottom="8dp">
-
-        <Button
-            android:id="@+id/btn_check_device"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="检查设备"
-            android:layout_marginEnd="8dp"/>
-
-        <Button
-            android:id="@+id/btn_restart_device"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="重启设备"/>
-
-    </LinearLayout>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:layout_marginBottom="8dp">
-
-        <Button
-            android:id="@+id/btn_query_bt_version"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="查询蓝牙版本"
-            android:layout_marginEnd="8dp"/>
-
-        <ToggleButton
-            android:id="@+id/toggle_log"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:textOn="关闭日志"
-            android:textOff="开启日志"/>
-
-    </LinearLayout>
-
-</LinearLayout>

app/src/main/res/layout/activity_main.xml

@@ -1,23 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/main"
+    android:id="@+id/main_layout"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:padding="16dp"
     tools:context=".MainActivity">
 
-    <TextView
+    <com.ismart.ib86.view.RobotEyesView
-        android:id="@+id/titleTextView"
+        android:layout_width="match_parent"
-        android:layout_width="wrap_content"
+        android:layout_height="match_parent"/>
-        android:layout_height="wrap_content"
+</RelativeLayout>
-        android:text="iB86 功能演示"
-        android:textSize="24sp"
-        android:textStyle="bold"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        android:layout_marginTop="32dp" />
-
-</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_wear_detection.xml

@@ -1,66 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:padding="16dp">
-
-    <TextView
-        android:id="@+id/titleTextView"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="佩戴检测"
-        android:textSize="24sp"
-        android:textStyle="bold"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        android:layout_marginTop="16dp" />
-
-    <Button
-        android:id="@+id/detectButton"
-        android:layout_width="0dp"
-        android:layout_height="wrap_content"
-        android:text="检测佩戴状态"
-        app:layout_constraintTop_toBottomOf="@id/titleTextView"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        android:layout_marginTop="32dp" />
-
-    <TextView
-        android:id="@+id/statusLabelTextView"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="佩戴状态："
-        android:textSize="18sp"
-        app:layout_constraintTop_toBottomOf="@id/detectButton"
-        app:layout_constraintStart_toStartOf="parent"
-        android:layout_marginTop="32dp" />
-
-    <TextView
-        android:id="@+id/statusTextView"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="未检测"
-        android:textSize="18sp"
-        android:textStyle="bold"
-        app:layout_constraintTop_toTopOf="@id/statusLabelTextView"
-        app:layout_constraintStart_toEndOf="@id/statusLabelTextView"
-        android:layout_marginStart="8dp" />
-
-    <TextView
-        android:id="@+id/logTextView"
-        android:layout_width="0dp"
-        android:layout_height="0dp"
-        android:background="#F5F5F5"
-        android:padding="8dp"
-        android:scrollbars="vertical"
-        android:gravity="top|start"
-        app:layout_constraintTop_toBottomOf="@id/statusLabelTextView"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintBottom_toBottomOf="parent"
-        android:layout_marginTop="32dp" />
-
-</androidx.constraintlayout.widget.ConstraintLayout>