我一直在尝试解决这个问题，但是一直没有成功。这是一个Udacity课程，在课程中我正在尝试使用待定意图创建通知，但是待定意图是可变的，我已经尝试了以下方法。
ViewModel
private val REQUEST_CODE = 0
private val TRIGGER_TIME = "TRIGGER_AT"
private val minute: Long = 60_000L
private val second: Long = 1_000L
private val timerLengthOptions: IntArray
private val notifyPendingIntent: PendingIntent
private val alarmManager = app.getSystemService(Context.ALARM_SERVICE) as AlarmManager
private var prefs =
app.getSharedPreferences("com.shivaConsulting.androidProjects.kotlinnotificatons", Context.MODE_PRIVATE)
private val notifyIntent = Intent(app, AlarmReciever::class.java)
private val _timeSelection = MutableLiveData<Int>()
val timeSelection: LiveData<Int>
get() = _timeSelection
private val _elapsedTime = MutableLiveData<Long>()
val elapsedTime: LiveData<Long>
get() = _elapsedTime
private var _alarmOn = MutableLiveData<Boolean>()
val isAlarmOn: LiveData<Boolean>
get() = _alarmOn
private lateinit var timer: CountDownTimer
init {
_alarmOn.value = PendingIntent.getBroadcast(
getApplication(),
REQUEST_CODE,
notifyIntent,
PendingIntent.FLAG_NO_CREATE
) != null
notifyPendingIntent = PendingIntent.getBroadcast(
getApplication(),
REQUEST_CODE,
notifyIntent,
PendingIntent.FLAG_UPDATE_CURRENT
)
timerLengthOptions = app.resources.getIntArray(R.array.minutes_array)
//If alarm is not null, resume the timer back for this alarm
if (_alarmOn.value!!) {
createTimer()
}
}
/**
* Turns on or off the alarm
*
* @param isChecked, alarm status to be set.
*/
fun setAlarm(isChecked: Boolean) {
when (isChecked) {
true -> timeSelection.value?.let { startTimer(it) }
false -> cancelNotification()
}
}
/**
* Sets the desired interval for the alarm
*
* @param timerLengthSelection, interval timerLengthSelection value.
*/
fun setTimeSelected(timerLengthSelection: Int) {
_timeSelection.value = timerLengthSelection
}
/**
* Creates a new alarm, notification and timer
*/
private fun startTimer(timerLengthSelection: Int) {
_alarmOn.value?.let {
if (!it) {
_alarmOn.value = true
val selectedInterval = when (timerLengthSelection) {
0 -> second * 10 //For testing only
else ->timerLengthOptions[timerLengthSelection] * minute
}
val triggerTime = SystemClock.elapsedRealtime() + selectedInterval
// TODO: Step 1.5 get an instance of NotificationManager and call sendNotification
// TODO: Step 1.15 call cancel notification
AlarmManagerCompat.setExactAndAllowWhileIdle(
alarmManager,
AlarmManager.ELAPSED_REALTIME_WAKEUP,
triggerTime,
notifyPendingIntent
)
viewModelScope.launch {
saveTime(triggerTime)
}
}
}
createTimer()
}
/**
* Creates a new timer
*/
private fun createTimer() {
viewModelScope.launch {
val triggerTime = loadTime()
timer = object : CountDownTimer(triggerTime, second) {
override fun onTick(millisUntilFinished: Long) {
_elapsedTime.value = triggerTime - SystemClock.elapsedRealtime()
if (_elapsedTime.value!! <= 0) {
resetTimer()
}
}
override fun onFinish() {
resetTimer()
}
}
timer.start()
}
}
/**
* Cancels the alarm, notification and resets the timer
*/
private fun cancelNotification() {
resetTimer()
alarmManager.cancel(notifyPendingIntent)
}
/**
* Resets the timer on screen and sets alarm value false
*/
private fun resetTimer() {
timer.cancel()
_elapsedTime.value = 0
_alarmOn.value = false
}
private suspend fun saveTime(triggerTime: Long) =
withContext(Dispatchers.IO) {
prefs.edit().putLong(TRIGGER_TIME, triggerTime).apply()
}
private suspend fun loadTime(): Long =
withContext(Dispatchers.IO) {
prefs.getLong(TRIGGER_TIME, 0)
}'''
片段
class BlankFragment : Fragment() {
companion object {
fun newInstance() = BlankFragment()
}
private val viewModel : BlankViewModel by lazy {
ViewModelProvider(this).get(BlankViewModel::class.java)
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val binding = FragmentBlankBinding.inflate(inflater)
binding.lifecycleOwner = this
binding.blankViewModel = viewModel
return binding.root
} '''
我在查看其他类似问题时发现这些问题都可以通过我已经添加的 gradle 依赖项来解决。
implementation 'androidx.work:work-runtime-ktx:2.7.1'
但是出现了这个错误
E/AndroidRuntime: Caused by: java.lang.IllegalArgumentException: com.shivaconsulting.kotlinnotifications: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
at android.app.PendingIntent.checkFlags(PendingIntent.java:378)
at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:648)
at android.app.PendingIntent.getBroadcast(PendingIntent.java:635)
at com.shivaconsulting.kotlinnotifications.ui.BlankViewModel.<init>(BlankViewModel.kt:52)
... 44 more