下面的代码与我的 DatePicker 方法有关，您可以选择一个日期，TextView 显示选择的日期，如图 https://i.stack.imgur.com/cco6D.png
当我保存日期并返回到刚刚保存日期的 Letter 时，它会继续显示 DatePicker，使之前的输入变得多余，基本上每次都要求一个新的输入，而不是保存之前的输入。
>我注意到它可能来自我的 DatePickerDialog(this, this, year, month, day).show() ，因为它在每次用户输入字母时显示，我必须将它放入什么才能阻止它在每次用户输入字母时显示？
有人知道它为什么会这样做吗？
activity_layout.xml 代码
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_timePicker"
android:text="What's the date?"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textTime"
android:layout_marginTop="20dp"
android:textColor="#000000"
android:textSize="22sp"
android:textStyle="bold"
tools:text="@tools:sample/date/ddmmyy"/>
主要活动代码
class NewsActivity : AppCompatActivity(), AnkoLogger, DatePickerDialog.OnDateSetListener, TimePickerDialog.OnTimeSetListener {
var letter = NewsItemModel()
lateinit var app : MainApp
var edit = false
val IMAGE_REQUEST = 1
/* https://www.youtube.com/watch?v=GmmyCOpIutA&ab_channel=CodePalace */
var day = 0
var month = 0
var year = 0
var hour = 0
var minute = 0
var savedDay = 0
var savedMonth = 0
var savedYear = 0
var savedHour = 0
var savedMinute = 0
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_letter)
app = application as MainApp
loadData()
btn_timePicker.setOnClickListener {
saveData()
Log.d("ClickListener", "just got clicked")
}
ratingBar.rating = 2.5f
ratingBar.stepSize = .5f
pickDate()
val dropDownList = arrayOf("Latest", "Coronavirus Updates", "Crime", "Traffic and Travel", "Business", "Politics", "Weather", "Education", "Health")
val adapter = ArrayAdapter(this, android.R.layout.simple_spinner_item, dropDownList)
adapter.setDropDownViewResource(android.R.layout.simple_spinner_item)
statusFilter.adapter = adapter
statusFilter.onItemSelectedListener = object : AdapterView.OnItemSelectedListener{
override fun onNothingSelected(parent: AdapterView<*>?) {
}
override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
if(statusFilter.selectedItemPosition == 1){
condition1()
}
if(statusFilter.selectedItemPosition == 2){
condition2()
}
if(statusFilter.selectedItemPosition == 3){
condition3()
}
if(statusFilter.selectedItemPosition == 4){
condition4()
}
if(statusFilter.selectedItemPosition == 5){
condition5()
}
if(statusFilter.selectedItemPosition == 6){
condition6()
}
if(statusFilter.selectedItemPosition == 7){
condition7()
}
if(statusFilter.selectedItemPosition == 8){
condition8()
}
if(statusFilter.selectedItemPosition == 9){
condition9()
}
}
private fun condition1(){
Toast.makeText(getApplicationContext(), "selected Item: " + statusFilter.selectedItem, Toast.LENGTH_LONG).show()
}
private fun condition2(){
Toast.makeText(getApplicationContext(), "selected Item: " + statusFilter.selectedItem, Toast.LENGTH_LONG).show()
}
private fun condition3(){
Toast.makeText(getApplicationContext(), "selected Item: " + statusFilter.selectedItem, Toast.LENGTH_LONG).show()
}
private fun condition4(){
Toast.makeText(getApplicationContext(), "selected Item: " + statusFilter.selectedItem, Toast.LENGTH_LONG).show()
}
private fun condition5(){
Toast.makeText(getApplicationContext(), "selected Item: " + statusFilter.selectedItem, Toast.LENGTH_LONG).show()
}
private fun condition6(){
Toast.makeText(getApplicationContext(), "selected Item: " + statusFilter.selectedItem, Toast.LENGTH_LONG).show()
}
private fun condition7(){
Toast.makeText(getApplicationContext(), "selected Item: " + statusFilter.selectedItem, Toast.LENGTH_LONG).show()
}
private fun condition8(){
Toast.makeText(getApplicationContext(), "selected Item: " + statusFilter.selectedItem, Toast.LENGTH_LONG).show()
}
private fun condition9(){
Toast.makeText(getApplicationContext(), "selected Item: " + statusFilter.selectedItem, Toast.LENGTH_LONG).show()
}
}
val submission = findViewById<Button>(R.id.submit_button)
submission.setOnClickListener {
Toast.makeText(this, "Button is clicked", Toast.LENGTH_LONG)
}
ratingBar.setOnRatingBarChangeListener { ratingBar, rating, fromUser ->
Toast.makeText(this, "Rating: $rating", Toast.LENGTH_SHORT).show()
}
LetterLocation.setOnClickListener {
startActivity(intentFor<MapsActivity>())
}
chooseImage.setOnClickListener {
showImagePicker(this, IMAGE_REQUEST)
}
if (intent.hasExtra("NewsLetter_edit")) {
edit = true
letterImage.setImageBitmap(readImageFromPath(this, letter.image))
if (letter.image != null) {
chooseImage.setText(R.string.change_letter_image)
}
letter = intent.extras?.getParcelable<NewsItemModel>("NewsLetter_edit")!!
letterTitle.setText(letter.title)
letterDescription.setText(letter.description)
letterAuthor.setText(letter.author)
letterImage.setImageBitmap(readImageFromPath(this, letter.image))
btnAdd.setText(R.string.save_letter)
}
btnAdd.setOnClickListener() {
letter.title = letterTitle.text.toString()
letter.description = letterDescription.text.toString()
letter.author = letterAuthor.text.toString()
if (letter.title.isEmpty()) {
toast(R.string.enter_letter_title)
} else {
if (edit) {
app.letters.update(letter.copy())
} else {
app.letters.create(letter.copy())
}
}
info("add Button Pressed: $letterTitle")
setResult(AppCompatActivity.RESULT_OK)
finish()
}
toolbarAdd.title = title
setSupportActionBar(toolbarAdd)
}
private fun saveData() {
val insertedText = btn_timePicker.text.toString()
val key1 = "STRING_KEY"
val key2 = "BOOLEAN_KEY"
textTime.text = insertedText
val sharedPreferences = getSharedPreferences("sharedPrefs", Context.MODE_PRIVATE) ?: return
with(sharedPreferences.edit()) {
putString(key1, insertedText)
apply()
}
Toast.makeText(this@NewsActivity, "Data Saved", Toast.LENGTH_SHORT).show()
}
fun onClick(v: View?) {
(activity as NewsActivity).onDateSet(textTime)
}
private fun loadData() {
val sharedPreferences = getSharedPreferences("sharedPrefs", Context.MODE_PRIVATE)
val savedString = sharedPreferences.getString("STRING_KEY", null)
textTime.text = savedString
}
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
menuInflater.inflate(R.menu.menu_letter, menu)
if (edit && menu != null) menu.getItem(0).setVisible(true)
return super.onCreateOptionsMenu(menu)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item?.itemId) {
R.id.item_delete -> {
app.letters.delete(letter)
finish()
}
R.id.item_cancel -> {
finish()
}
}
return super.onOptionsItemSelected(item)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
when (requestCode) {
IMAGE_REQUEST -> {
if (data != null) {
letter.image = data.getData().toString()
letterImage.setImageBitmap(readImage(this, resultCode, data))
chooseImage.setText(R.string.change_letter_image)
}
}
}
}
private fun getDateTimeCalendar(){
val cal = Calendar.getInstance()
day = cal.get(Calendar.DAY_OF_MONTH)
month = cal.get(Calendar.MONTH)
year = cal.get(Calendar.YEAR)
hour = cal.get(Calendar.HOUR)
minute = cal.get(Calendar.MINUTE)
}
private fun pickDate() {
if (textTime != null) {
getDateTimeCalendar()
DatePickerDialog(this, this, year, month, day).show()
}
}
override fun onDateSet(view: DatePicker?, year: Int, month: Int, dayOfMonth: Int) {
savedDay = dayOfMonth
savedMonth = month
savedYear = year
getDateTimeCalendar()
TimePickerDialog(this, this, hour, minute, true).show()
}
override fun onTimeSet(view: TimePicker?, hourOfDay: Int, minute: Int) {
savedHour = hourOfDay
savedMinute = minute
textTime.text = "\n $savedDay-$savedMonth-$savedYear\n Hour: $savedHour Minute: $savedMinute"
}
}
答案 0 :(得分：0)
请尝试使用 commit() 代替 apply()。
apply() 函数立即更改内存中的 SharedPreferences 对象，但将更新异步写入磁盘。或者，您可以使用 commit() 将数据同步写入磁盘。但是由于 commit() 是同步的，您应该避免从主线程调用它，因为它可能会暂停您的 UI 渲染。
with(sharedPreferences.edit()) {
putString(key1, insertedText)
commit()
}