设置页面（1）

app/src/main/java/com/example/defenseapplication/view/TimePickerFragment.kt

@@ -0,0 +1,33 @@
+import android.app.Dialog
+import android.app.TimePickerDialog
+import android.os.Bundle
+import android.text.format.DateFormat
+import android.widget.TimePicker
+import androidx.fragment.app.DialogFragment
+import java.util.Calendar
+
+class TimePickerFragment(private val onTimeSelected: (hour: Int, minute: Int) -> Unit) :
+    DialogFragment(), TimePickerDialog.OnTimeSetListener {
+
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        // 使用当前时间作为默认值
+        val c = Calendar.getInstance()
+        val hour = c.get(Calendar.HOUR_OF_DAY)
+        val minute = c.get(Calendar.MINUTE)
+
+        // 创建并返回 TimePickerDialog 实例
+        // activity 参数需要可空性处理，this是OnTimeSetListener，最后一个是是否24小时制
+        return TimePickerDialog(
+            requireActivity(),
+            this,
+            hour,
+            minute,
+            DateFormat.is24HourFormat(activity)
+        )
+    }
+
+    override fun onTimeSet(view: TimePicker?, hourOfDay: Int, minute: Int) {
+        // 当用户设置时间时，通过回调将结果传回
+        onTimeSelected(hourOfDay, minute)
+    }
+}