用Android studio使用kotlin编写记录开始日期到结束日期消耗的卡路里,可以选择开始日期和结束日期
时间: 2024-05-06 17:14:48 浏览: 171
你可以使用 Android Studio 中的 DatePicker 和 TimePicker 控件来让用户选择日期和时间,然后使用 Kotlin 编写逻辑来计算卡路里消耗,并将数据保存到本地。
以下是一个简单的示例:
1. 在布局文件中添加 DatePicker 和 TimePicker 控件:
```xml
<DatePicker
android:id="@+id/start_date_picker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TimePicker
android:id="@+id/start_time_picker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<DatePicker
android:id="@+id/end_date_picker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TimePicker
android:id="@+id/end_time_picker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
```
2. 在 Kotlin 代码中获取用户选择的日期和时间,并计算卡路里消耗:
```kotlin
val startDatePicker = findViewById<DatePicker>(R.id.start_date_picker)
val startTimePicker = findViewById<TimePicker>(R.id.start_time_picker)
val endDatePicker = findViewById<DatePicker>(R.id.end_date_picker)
val endTimePicker = findViewById<TimePicker>(R.id.end_time_picker)
val startCalendar = Calendar.getInstance().apply {
set(Calendar.YEAR, startDatePicker.year)
set(Calendar.MONTH, startDatePicker.month)
set(Calendar.DAY_OF_MONTH, startDatePicker.dayOfMonth)
set(Calendar.HOUR_OF_DAY, startTimePicker.hour)
set(Calendar.MINUTE, startTimePicker.minute)
}
val endCalendar = Calendar.getInstance().apply {
set(Calendar.YEAR, endDatePicker.year)
set(Calendar.MONTH, endDatePicker.month)
set(Calendar.DAY_OF_MONTH, endDatePicker.dayOfMonth)
set(Calendar.HOUR_OF_DAY, endTimePicker.hour)
set(Calendar.MINUTE, endTimePicker.minute)
}
val durationMillis = endCalendar.timeInMillis - startCalendar.timeInMillis
val durationHours = TimeUnit.MILLISECONDS.toHours(durationMillis)
val caloriesPerHour = 100 // replace with your own calculation
val totalCalories = durationHours * caloriesPerHour
```
3. 将计算得到的卡路里保存到本地:
```kotlin
val sharedPreferences = getSharedPreferences("my_preferences", Context.MODE_PRIVATE)
sharedPreferences.edit().putInt("total_calories", totalCalories).apply()
```
当需要读取数据时,可以使用以下代码:
```kotlin
val sharedPreferences = getSharedPreferences("my_preferences", Context.MODE_PRIVATE)
val totalCalories = sharedPreferences.getInt("total_calories", 0)
```
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