feat: 添加清除当前任务功能

在设置页面添加清除任务按钮，点击后可清空当前任务状态。同时，在 MQTT 收到任何指令时也自动清空任务，确保开门等基础行为不受任务状态影响。新增相关字符串资源并处理界面回调。

app/src/main/java/com/example/lzwcai_terminal_temi/MainActivity.kt

@@ -62,6 +62,21 @@ class MainActivity : AppCompatActivity(), OnRobotReadyListener, TtsListener, OnG
     private lateinit var permissionManager: PermissionManager
     private var liveKitManager: LiveKitManager? = null
     private var isLiveKitConnected = false
+
+    companion object {
+        private const val REQUEST_CLEAR_TASK = 1001
+    }
+
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        if (requestCode == REQUEST_CLEAR_TASK && resultCode == RESULT_OK) {
+            data?.getBooleanExtra("clear_task", false)?.let { clearTask ->
+                if (clearTask) {
+                    setCurrentTask("")
+                }
+            }
+        }
+    }
     private var isMqttConnected = false
 
     private var lastArrivalLocation: String? = null
@@ -144,7 +159,7 @@ class MainActivity : AppCompatActivity(), OnRobotReadyListener, TtsListener, OnG
             lastArrivalLocation = prefs.getString("current_location", null)
         }
         binding.btnSettings.setOnClickListener {
-            startActivity(Intent(this, SettingsActivity::class.java))
+            startActivityForResult(Intent(this, SettingsActivity::class.java), REQUEST_CLEAR_TASK)
         }
 
         taskController = TaskController(

app/src/main/java/com/example/lzwcai_terminal_temi/MqttManager.kt

@@ -268,6 +268,10 @@ class MqttManager(
     }
 
     private fun handleJsonCommand(obj: JSONObject) {
+        // 收到任何 MQTT 指令时清空当前任务，确保开门等基础行为不受影响
+        scope.launch(Dispatchers.Main) {
+            (context as? MainActivity)?.setCurrentTask("")
+        }
         val action = obj.optString("action", obj.optString("cmd", obj.optString("type", ""))).lowercase()
         when (action) {
             "recharge" -> {

app/src/main/java/com/example/lzwcai_terminal_temi/SettingsActivity.kt

@@ -110,6 +110,7 @@ class SettingsActivity : AppCompatActivity() {
         setupRestartButton()
         setupSpecialStateSwitch()
         setupLocationSelector()
+        setupClearTaskButton()
     }
 
     override fun onResume() {
@@ -159,6 +160,17 @@ class SettingsActivity : AppCompatActivity() {
         }
     }
 
+    private fun setupClearTaskButton() {
+        binding.btnClearTask.setOnClickListener {
+            val resultIntent = Intent().apply {
+                putExtra("clear_task", true)
+            }
+            setResult(RESULT_OK, resultIntent)
+            Toast.makeText(this, getString(R.string.msg_task_cleared), Toast.LENGTH_SHORT).show()
+            finish()
+        }
+    }
+
     private fun startRestartAnimation() {
         binding.restartProgressBar.visibility = View.VISIBLE
         restartAnimator = ValueAnimator.ofInt(0, 100).apply {

app/src/main/res/layout-land/activity_settings.xml

@@ -378,6 +378,15 @@
                                 android:visibility="invisible" />
                         </FrameLayout>
 
+                        <Button
+                            android:id="@+id/btnClearTask"
+                            style="@style/Widget.App.Button"
+                            android:layout_width="match_parent"
+                            android:layout_height="72dp"
+                            android:layout_marginTop="16dp"
+                            android:textSize="20sp"
+                            android:text="@string/btn_clear_task" />
+
                         <TextView
                             android:id="@+id/tvVersion"
                             android:layout_width="wrap_content"

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

@@ -362,6 +362,15 @@
                             android:visibility="invisible" />
                     </FrameLayout>
 
+                    <Button
+                        android:id="@+id/btnClearTask"
+                        style="@style/Widget.App.Button"
+                        android:layout_width="match_parent"
+                        android:layout_height="72dp"
+                        android:layout_marginTop="16dp"
+                        android:textSize="20sp"
+                        android:text="@string/btn_clear_task" />
+
                     <TextView
                         android:id="@+id/tvVersion"
                         android:layout_width="wrap_content"

app/src/main/res/values/strings.xml

@@ -35,4 +35,6 @@
     <string name="livekit_status_disconnected">LiveKit 已断开</string>
     <string name="livekit_status_failed">LiveKit 连接失败</string>
     <string name="livekit_status_permission">需要麦克风/摄像头权限</string>
+    <string name="btn_clear_task">清除当前任务</string>
+    <string name="msg_task_cleared">当前任务已清除</string>
 </resources>