为什么在此应用程序中会发生两次按钮点击？
Why do button clicks happen twice in this app?
我有一个应用程序，其中一个功能是您可以通过单击卡片视图来选择星期几。
我目前的问题是，如果您执行以下序列，您会得到意想不到的结果：
Clear -> pick day -> add task -> submit -> back button to Main Activity
当你执行这个序列时，数据库在初始清除后意外地再次被清除，或者如果你去一天，添加一个任务，然后导航回来，它再次运行 and/or 让你回到你刚离开那天的景色。
我注意到的和我尝试过的：
我的 foreach 循环做了它应该做的事情：翻阅工作日，直到它命中正确的一天......但它又做了一次？我从日志和完成后再次弹出 Toast 知道它发生了太多（它说 db cleared automatically followed by there's nothing to clear).我还尝试在 foreach 循环中添加断点，但我认为这对我没有帮助，因为如果我没记错的话，它只会中断循环的迭代一次？
我已经尝试了一个 activity 级别的布尔变量来让它在我需要的时候停止和启动，但问题最终是我要么需要按任何给定的卡片两次，但它不起作用选择第一个项目后，什么都不做，否则问题仍然存在。
我在 xml 中使用 onClick 作为按钮侦听器，但我也尝试将它编程到 activity kotlin class 中，但它没有差异
也许我只是在某处缺少额外的循环迭代，或者在适当的地方中断？
主要ActivityXML
<?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"
tools:context=".MainActivity" >
<TextView
android:id="@+id/top_box"
android:layout_width="0dp"
android:layout_height="90dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<com.google.android.material.card.MaterialCardView
android:id="@+id/clear_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/top_box"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="@id/sunday_card"
app:layout_constraintBottom_toTopOf="@id/wednesday_card">
<TextView
android:id="@+id/clear_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"
/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/sunday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@+id/top_box"
app:layout_constraintLeft_toRightOf="@id/clear_card"
app:layout_constraintRight_toLeftOf="@id/monday_card"
app:layout_constraintBottom_toTopOf="@id/thursday_card">
<TextView
android:id="@+id/sunday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/monday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/top_box"
app:layout_constraintLeft_toRightOf="@id/sunday_card"
app:layout_constraintRight_toLeftOf="@id/tuesday_card"
app:layout_constraintBottom_toTopOf="@id/friday_card">
<TextView
android:id="@+id/monday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/tuesday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/top_box"
app:layout_constraintLeft_toRightOf="@id/monday_card"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toTopOf="@id/saturday_card">
<TextView
android:id="@+id/tuesday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/wednesday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/clear_card"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="@id/thursday_card"
app:layout_constraintBottom_toTopOf="@id/bottom_box">
<TextView
android:id="@+id/wednesday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/thursday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/sunday_card"
app:layout_constraintLeft_toRightOf="@id/wednesday_card"
app:layout_constraintRight_toRightOf="@id/friday_card"
app:layout_constraintBottom_toTopOf="@id/bottom_box">
<TextView
android:id="@+id/thursday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/friday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/monday_card"
app:layout_constraintLeft_toRightOf="@id/thursday_card"
app:layout_constraintRight_toLeftOf="@id/saturday_card"
app:layout_constraintBottom_toTopOf="@id/bottom_box">
<TextView
android:id="@+id/friday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/saturday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/tuesday_card"
app:layout_constraintLeft_toRightOf="@id/friday_card"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toTopOf="@id/bottom_box">
<TextView
android:id="@+id/saturday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<TextView
android:id="@+id/bottom_box"
android:layout_width="0dp"
android:layout_height="90dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
主要Activity
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
private val plannerViewModel: PlannerViewModel by viewModels {
PlannerViewModelFactory((application as PlannerApplication).repository)
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
val clearButtonText = binding.clearCardText
val sundayButtonText = binding.sundayCardText
val mondayButtonText = binding.mondayCardText
val tuesdayButtonText = binding.tuesdayCardText
val wednesdayButtonText = binding.wednesdayCardText
val thursdayButtonText = binding.thursdayCardText
val fridayButtonText = binding.fridayCardText
val saturdayButtonText = binding.saturdayCardText
// Setting day card names
clearButtonText.text = "Clear"
sundayButtonText.text = "Sun"
mondayButtonText.text = "Mon"
tuesdayButtonText.text = "Tue"
wednesdayButtonText.text = "Wed"
thursdayButtonText.text = "Thu"
fridayButtonText.text = "Fri"
saturdayButtonText.text = "Sat"
sundayButtonText.text = "Sun"
}
private fun startWeekdayActivity(day: Weekday) {
val intent = Intent(this, WeekdayActivity::class.java)
intent.putExtra("dayId", day.id)
this.startActivity(intent)
}
private fun clearDb() {
val alertDialog: AlertDialog? = this?.let { outerIt ->
val builder = AlertDialog.Builder(outerIt)
builder.apply {
setPositiveButton("Clear",
DialogInterface.OnClickListener { dialog, id ->
plannerViewModel.allTasks.observe(outerIt, {
if (it.count() == 0) {
Toast.makeText(context, "No tasks to clear", Toast.LENGTH_SHORT).show()
}
else {
plannerViewModel.deleteAllTasks()
Toast.makeText(context, "Tasks cleared", Toast.LENGTH_SHORT).show()
}
})
})
setNegativeButton("Cancel",
DialogInterface.OnClickListener { dialog, id ->
// User cancelled the dialog
})
}
.setTitle("Clear tasks?")
.setMessage("Are you sure you want to clear the weeks tasks?")
// Create the AlertDialog
builder.create()
}
alertDialog?.show()
}
private fun checkDay(dayIn: String) {
var dayOut: Weekday? = null
plannerViewModel.allWeekdays.observe(this, { weekdays ->
weekdays?.let {
weekdays.forEach {
if (dayIn == "clear_card" && it.day == "Clear") {
clearDb()
dayOut = it
}
else {
val dayInAbr = dayIn.substring(0, 3).toLowerCase(Locale.ROOT)
val dayOutAbr = it.day.substring(0,3).toLowerCase(Locale.ROOT)
if (dayInAbr == dayOutAbr) {
dayOut = it
dayOut?.let { startWeekdayActivity(it) }
}
}
if (dayOut != null) {
return@let
}
}
}
})
}
fun buttonClick(view: View) {
when(view.id) {
R.id.clear_card -> checkDay(view.context.resources.getResourceEntryName(R.id.clear_card).toString())
R.id.sunday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.sunday_card).toString())
R.id.monday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.monday_card).toString())
R.id.tuesday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.tuesday_card).toString())
R.id.wednesday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.wednesday_card).toString())
R.id.thursday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.thursday_card).toString())
R.id.friday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.friday_card).toString())
R.id.saturday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.saturday_card).toString())
}
}
}
Jay在评论中回答的问题
如果您知道我如何将 SO 积分和声誉归功于他们，请告诉我！
我需要停止每次 checkDay() 运行 调用更多的观察者实例。将观察员移动到 onCreate() 以便他们只 运行 一次似乎解决了我的问题！
主要工作代码Activity
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
private val plannerViewModel: PlannerViewModel by viewModels {
PlannerViewModelFactory((application as PlannerApplication).repository)
}
lateinit var weekdayList: List<Weekday>
lateinit var taskList: List<Task>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
val clearButtonText = binding.clearCardText
val sundayButtonText = binding.sundayCardText
val mondayButtonText = binding.mondayCardText
val tuesdayButtonText = binding.tuesdayCardText
val wednesdayButtonText = binding.wednesdayCardText
val thursdayButtonText = binding.thursdayCardText
val fridayButtonText = binding.fridayCardText
val saturdayButtonText = binding.saturdayCardText
// Setting day card names
clearButtonText.text = "Clear"
sundayButtonText.text = "Sun"
mondayButtonText.text = "Mon"
tuesdayButtonText.text = "Tue"
wednesdayButtonText.text = "Wed"
thursdayButtonText.text = "Thu"
fridayButtonText.text = "Fri"
saturdayButtonText.text = "Sat"
sundayButtonText.text = "Sun"
plannerViewModel.allTasks.observe(this, {
taskList = it
})
plannerViewModel.allWeekdays.observe(this, {
weekdayList = it
})
}
private fun startWeekdayActivity(day: Weekday) {
val intent = Intent(this, WeekdayActivity::class.java)
intent.putExtra("dayId", day.id)
this.startActivity(intent)
}
private fun clearDb(taskList: List<Task>) {
val alertDialog: AlertDialog? = this?.let { outerIt ->
val builder = AlertDialog.Builder(outerIt)
builder.apply {
setPositiveButton("Clear",
DialogInterface.OnClickListener { dialog, id ->
if (taskList.count() == 0) {
Toast.makeText(context, "No tasks to clear", Toast.LENGTH_SHORT).show()
} else {
plannerViewModel.deleteAllTasks()
Toast.makeText(context, "Tasks cleared", Toast.LENGTH_SHORT).show()
}
})
setNegativeButton("Cancel",
DialogInterface.OnClickListener { dialog, id ->
// User cancelled the dialog
})
}
.setTitle("Clear tasks?")
.setMessage("Are you sure you want to clear the weeks tasks?")
builder.create()
}
alertDialog?.show()
}
private fun checkDay(dayIn: String, weekdayList: List<Weekday>) {
weekdayList.forEach {
if (dayIn == "clear_card" && it.day == "Clear") {
clearDb(taskList)
} else {
val dayInAbr = dayIn.substring(0, 3).toLowerCase(Locale.ROOT)
val dayOutAbr = it.day.substring(0, 3).toLowerCase(Locale.ROOT)
if (dayInAbr == dayOutAbr) {
startWeekdayActivity(it)
}
}
}
}
fun buttonClick(view: View) {
when (view.id) {
R.id.clear_card -> checkDay(view.context.resources.getResourceEntryName(R.id.clear_card).toString(), weekdayList)
R.id.sunday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.sunday_card).toString(), weekdayList)
R.id.monday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.monday_card).toString(), weekdayList)
R.id.tuesday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.tuesday_card).toString(), weekdayList)
R.id.wednesday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.wednesday_card).toString(), weekdayList)
R.id.thursday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.thursday_card).toString(), weekdayList)
R.id.friday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.friday_card).toString(), weekdayList)
R.id.saturday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.saturday_card).toString(), weekdayList)
}
}
}
我有一个应用程序，其中一个功能是您可以通过单击卡片视图来选择星期几。
我目前的问题是，如果您执行以下序列，您会得到意想不到的结果：
Clear -> pick day -> add task -> submit -> back button to Main Activity
当你执行这个序列时，数据库在初始清除后意外地再次被清除，或者如果你去一天，添加一个任务，然后导航回来，它再次运行 and/or 让你回到你刚离开那天的景色。
我注意到的和我尝试过的：
我的 foreach 循环做了它应该做的事情：翻阅工作日，直到它命中正确的一天......但它又做了一次？我从日志和完成后再次弹出 Toast 知道它发生了太多（它说 db cleared automatically followed by there's nothing to clear).我还尝试在 foreach 循环中添加断点，但我认为这对我没有帮助，因为如果我没记错的话，它只会中断循环的迭代一次？
我已经尝试了一个 activity 级别的布尔变量来让它在我需要的时候停止和启动，但问题最终是我要么需要按任何给定的卡片两次，但它不起作用选择第一个项目后，什么都不做，否则问题仍然存在。
我在 xml 中使用 onClick 作为按钮侦听器，但我也尝试将它编程到 activity kotlin class 中，但它没有差异
也许我只是在某处缺少额外的循环迭代，或者在适当的地方中断？
主要ActivityXML
<?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"
tools:context=".MainActivity" >
<TextView
android:id="@+id/top_box"
android:layout_width="0dp"
android:layout_height="90dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<com.google.android.material.card.MaterialCardView
android:id="@+id/clear_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/top_box"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="@id/sunday_card"
app:layout_constraintBottom_toTopOf="@id/wednesday_card">
<TextView
android:id="@+id/clear_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"
/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/sunday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@+id/top_box"
app:layout_constraintLeft_toRightOf="@id/clear_card"
app:layout_constraintRight_toLeftOf="@id/monday_card"
app:layout_constraintBottom_toTopOf="@id/thursday_card">
<TextView
android:id="@+id/sunday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/monday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/top_box"
app:layout_constraintLeft_toRightOf="@id/sunday_card"
app:layout_constraintRight_toLeftOf="@id/tuesday_card"
app:layout_constraintBottom_toTopOf="@id/friday_card">
<TextView
android:id="@+id/monday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/tuesday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/top_box"
app:layout_constraintLeft_toRightOf="@id/monday_card"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toTopOf="@id/saturday_card">
<TextView
android:id="@+id/tuesday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/wednesday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/clear_card"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="@id/thursday_card"
app:layout_constraintBottom_toTopOf="@id/bottom_box">
<TextView
android:id="@+id/wednesday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/thursday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/sunday_card"
app:layout_constraintLeft_toRightOf="@id/wednesday_card"
app:layout_constraintRight_toRightOf="@id/friday_card"
app:layout_constraintBottom_toTopOf="@id/bottom_box">
<TextView
android:id="@+id/thursday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/friday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/monday_card"
app:layout_constraintLeft_toRightOf="@id/thursday_card"
app:layout_constraintRight_toLeftOf="@id/saturday_card"
app:layout_constraintBottom_toTopOf="@id/bottom_box">
<TextView
android:id="@+id/friday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/saturday_card"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="10dp"
android:onClick="buttonClick"
app:layout_constraintTop_toBottomOf="@id/tuesday_card"
app:layout_constraintLeft_toRightOf="@id/friday_card"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toTopOf="@id/bottom_box">
<TextView
android:id="@+id/saturday_card_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center"/>
</com.google.android.material.card.MaterialCardView>
<TextView
android:id="@+id/bottom_box"
android:layout_width="0dp"
android:layout_height="90dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
主要Activity
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
private val plannerViewModel: PlannerViewModel by viewModels {
PlannerViewModelFactory((application as PlannerApplication).repository)
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
val clearButtonText = binding.clearCardText
val sundayButtonText = binding.sundayCardText
val mondayButtonText = binding.mondayCardText
val tuesdayButtonText = binding.tuesdayCardText
val wednesdayButtonText = binding.wednesdayCardText
val thursdayButtonText = binding.thursdayCardText
val fridayButtonText = binding.fridayCardText
val saturdayButtonText = binding.saturdayCardText
// Setting day card names
clearButtonText.text = "Clear"
sundayButtonText.text = "Sun"
mondayButtonText.text = "Mon"
tuesdayButtonText.text = "Tue"
wednesdayButtonText.text = "Wed"
thursdayButtonText.text = "Thu"
fridayButtonText.text = "Fri"
saturdayButtonText.text = "Sat"
sundayButtonText.text = "Sun"
}
private fun startWeekdayActivity(day: Weekday) {
val intent = Intent(this, WeekdayActivity::class.java)
intent.putExtra("dayId", day.id)
this.startActivity(intent)
}
private fun clearDb() {
val alertDialog: AlertDialog? = this?.let { outerIt ->
val builder = AlertDialog.Builder(outerIt)
builder.apply {
setPositiveButton("Clear",
DialogInterface.OnClickListener { dialog, id ->
plannerViewModel.allTasks.observe(outerIt, {
if (it.count() == 0) {
Toast.makeText(context, "No tasks to clear", Toast.LENGTH_SHORT).show()
}
else {
plannerViewModel.deleteAllTasks()
Toast.makeText(context, "Tasks cleared", Toast.LENGTH_SHORT).show()
}
})
})
setNegativeButton("Cancel",
DialogInterface.OnClickListener { dialog, id ->
// User cancelled the dialog
})
}
.setTitle("Clear tasks?")
.setMessage("Are you sure you want to clear the weeks tasks?")
// Create the AlertDialog
builder.create()
}
alertDialog?.show()
}
private fun checkDay(dayIn: String) {
var dayOut: Weekday? = null
plannerViewModel.allWeekdays.observe(this, { weekdays ->
weekdays?.let {
weekdays.forEach {
if (dayIn == "clear_card" && it.day == "Clear") {
clearDb()
dayOut = it
}
else {
val dayInAbr = dayIn.substring(0, 3).toLowerCase(Locale.ROOT)
val dayOutAbr = it.day.substring(0,3).toLowerCase(Locale.ROOT)
if (dayInAbr == dayOutAbr) {
dayOut = it
dayOut?.let { startWeekdayActivity(it) }
}
}
if (dayOut != null) {
return@let
}
}
}
})
}
fun buttonClick(view: View) {
when(view.id) {
R.id.clear_card -> checkDay(view.context.resources.getResourceEntryName(R.id.clear_card).toString())
R.id.sunday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.sunday_card).toString())
R.id.monday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.monday_card).toString())
R.id.tuesday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.tuesday_card).toString())
R.id.wednesday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.wednesday_card).toString())
R.id.thursday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.thursday_card).toString())
R.id.friday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.friday_card).toString())
R.id.saturday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.saturday_card).toString())
}
}
}
Jay在评论中回答的问题
如果您知道我如何将 SO 积分和声誉归功于他们，请告诉我！
我需要停止每次 checkDay() 运行 调用更多的观察者实例。将观察员移动到 onCreate() 以便他们只 运行 一次似乎解决了我的问题！
主要工作代码Activity
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
private val plannerViewModel: PlannerViewModel by viewModels {
PlannerViewModelFactory((application as PlannerApplication).repository)
}
lateinit var weekdayList: List<Weekday>
lateinit var taskList: List<Task>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
val clearButtonText = binding.clearCardText
val sundayButtonText = binding.sundayCardText
val mondayButtonText = binding.mondayCardText
val tuesdayButtonText = binding.tuesdayCardText
val wednesdayButtonText = binding.wednesdayCardText
val thursdayButtonText = binding.thursdayCardText
val fridayButtonText = binding.fridayCardText
val saturdayButtonText = binding.saturdayCardText
// Setting day card names
clearButtonText.text = "Clear"
sundayButtonText.text = "Sun"
mondayButtonText.text = "Mon"
tuesdayButtonText.text = "Tue"
wednesdayButtonText.text = "Wed"
thursdayButtonText.text = "Thu"
fridayButtonText.text = "Fri"
saturdayButtonText.text = "Sat"
sundayButtonText.text = "Sun"
plannerViewModel.allTasks.observe(this, {
taskList = it
})
plannerViewModel.allWeekdays.observe(this, {
weekdayList = it
})
}
private fun startWeekdayActivity(day: Weekday) {
val intent = Intent(this, WeekdayActivity::class.java)
intent.putExtra("dayId", day.id)
this.startActivity(intent)
}
private fun clearDb(taskList: List<Task>) {
val alertDialog: AlertDialog? = this?.let { outerIt ->
val builder = AlertDialog.Builder(outerIt)
builder.apply {
setPositiveButton("Clear",
DialogInterface.OnClickListener { dialog, id ->
if (taskList.count() == 0) {
Toast.makeText(context, "No tasks to clear", Toast.LENGTH_SHORT).show()
} else {
plannerViewModel.deleteAllTasks()
Toast.makeText(context, "Tasks cleared", Toast.LENGTH_SHORT).show()
}
})
setNegativeButton("Cancel",
DialogInterface.OnClickListener { dialog, id ->
// User cancelled the dialog
})
}
.setTitle("Clear tasks?")
.setMessage("Are you sure you want to clear the weeks tasks?")
builder.create()
}
alertDialog?.show()
}
private fun checkDay(dayIn: String, weekdayList: List<Weekday>) {
weekdayList.forEach {
if (dayIn == "clear_card" && it.day == "Clear") {
clearDb(taskList)
} else {
val dayInAbr = dayIn.substring(0, 3).toLowerCase(Locale.ROOT)
val dayOutAbr = it.day.substring(0, 3).toLowerCase(Locale.ROOT)
if (dayInAbr == dayOutAbr) {
startWeekdayActivity(it)
}
}
}
}
fun buttonClick(view: View) {
when (view.id) {
R.id.clear_card -> checkDay(view.context.resources.getResourceEntryName(R.id.clear_card).toString(), weekdayList)
R.id.sunday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.sunday_card).toString(), weekdayList)
R.id.monday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.monday_card).toString(), weekdayList)
R.id.tuesday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.tuesday_card).toString(), weekdayList)
R.id.wednesday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.wednesday_card).toString(), weekdayList)
R.id.thursday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.thursday_card).toString(), weekdayList)
R.id.friday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.friday_card).toString(), weekdayList)
R.id.saturday_card -> checkDay(view.context.resources.getResourceEntryName(R.id.saturday_card).toString(), weekdayList)
}
}
}