我使用了 localazy.com 中浮动窗口的前台服务代码。在我更改了他们在 putExtra 方法中的代码中给出的包前缀名称后，我的前台服务没有向 onStartCommand() 发送正确的代码，它总是发送 null 而不是发送 EXIT 和 NOTE 命令。实际上，键名中的包前缀有什么用？为什么会出现这个问题？。
package com.krithik.floatingnote.service
import android.app.*
import android.content.Context
import android.content.Intent
import android.os.Build
import android.os.IBinder
import android.util.Log
import android.widget.Toast
import androidx.core.app.NotificationCompat
import com.krithik.floatingnote.R
const val INTENT_COMMAND = "com.localazy.quicknote.COMMAND"
const val INTENT_COMMAND_EXIT = "EXIT"
const val INTENT_COMMAND_NOTE = "NOTE"
private const val NOTIFICATION_CHANNEL_GENERAL = "note_general"
private const val CODE_FOREGROUND_SERVICE = 1
private const val CODE_EXIT_INTENT = 2
private const val CODE_NOTE_INTENT = 3
class FloatingService : Service() {
override fun onBind(intent: Intent?): IBinder? = null
/**
* Remove the foreground notification and stop the service.
*/
private fun stopService() {
stopForeground(true)
stopSelf()
}
/**
* Create and show the foreground notification.
*/
private fun showNotification() {
val manager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
val exitIntent = Intent(this, FloatingService::class.java).apply {
putExtra(INTENT_COMMAND, INTENT_COMMAND_EXIT)
}
val noteIntent = Intent(this, FloatingService::class.java).apply {
putExtra(INTENT_COMMAND, INTENT_COMMAND_NOTE)
}
val exitPendingIntent = PendingIntent.getService(
this, CODE_EXIT_INTENT, exitIntent, 0
)
val notePendingIntent = PendingIntent.getService(
this, CODE_NOTE_INTENT, noteIntent, 0
)
// From Android O, it's necessary to create a notification channel first.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
try {
with(
NotificationChannel(
NOTIFICATION_CHANNEL_GENERAL,
getString(R.string.notification_channel_general),
NotificationManager.IMPORTANCE_DEFAULT
)
) {
lockscreenVisibility = Notification.VISIBILITY_PUBLIC
manager.createNotificationChannel(this)
}
} catch (ignored: Exception) {
// Ignore exception.
}
}
with(
NotificationCompat.Builder(
this,
NOTIFICATION_CHANNEL_GENERAL
)
) {
setContentTitle(getString(R.string.app_name))
setContentText(getString(R.string.notification_text))
setAutoCancel(false)
setOngoing(true)
setSmallIcon(R.drawable.ic_baseline_note_24)
setContentIntent(notePendingIntent)
addAction(
NotificationCompat.Action(
0,
getString(R.string.notification_exit),
exitPendingIntent
)
)
startForeground(CODE_FOREGROUND_SERVICE, build())
}
}
override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
val command = intent.getStringExtra(INTENT_COMMAND)
Log.i("ServiceCommand", command.toString())
// Exit the service if we receive the EXIT command.
// START_NOT_STICKY is important here, we don't want
// the service to be relaunched.
if (command == INTENT_COMMAND_EXIT) {
stopService()
return START_NOT_STICKY
}
// Be sure to show the notification first for all commands.
// Don't worry, repeated calls have no effects.
showNotification()
// Show the floating window for adding a new note.
if (command == INTENT_COMMAND_NOTE) {
Toast.makeText(
this,
"Floating window to be added",
Toast.LENGTH_SHORT
).show()
}
return START_STICKY
}
}
package com.krithik.floatingnote
import android.content.Context
import android.content.Intent
import android.os.Build
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.databinding.DataBindingUtil
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProvider
import androidx.recyclerview.widget.LinearLayoutManager
import com.krithik.floatingnote.database.Note
import com.krithik.floatingnote.database.NoteDatabase
import com.krithik.floatingnote.database.NoteRepository
import com.krithik.floatingnote.databinding.ActivityMainBinding
import com.krithik.floatingnote.service.FloatingService
import com.krithik.floatingnote.service.INTENT_COMMAND
import com.krithik.floatingnote.viewModel.NoteViewModel
import com.krithik.floatingnote.viewModel.NoteViewModelFactory
import com.krithik.floatingnote.viewModel.RecyclerViewAdapter
class MainActivity : AppCompatActivity(), RecyclerViewAdapter.RowClickListener {
private lateinit var binding: ActivityMainBinding
private lateinit var noteViewModel: NoteViewModel
private lateinit var adapter: RecyclerViewAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
startFloatingService()
binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
val dao = NoteDatabase.getInstance(application).noteDao
val repository = NoteRepository(dao)
val factory = NoteViewModelFactory(repository)
noteViewModel = ViewModelProvider(this, factory).get(NoteViewModel::class.java)
binding.noteViewModel = noteViewModel
binding.lifecycleOwner = this
noteViewModel.message.observe(this, Observer {
it.getContentIfNotHandled()?.let {
Toast.makeText(this, it, Toast.LENGTH_LONG).show()
}
})
initRecyclerView()
noteViewModel.noteList.observe(this, Observer {
adapter.submitList(it)
})
}
private fun initRecyclerView() {
binding.noteRecyclerView.layoutManager = LinearLayoutManager(this)
adapter = RecyclerViewAdapter(this)
binding.noteRecyclerView.adapter = adapter
}
override fun onDeleteNote(note: Note) {
noteViewModel.deleteNote(note)
}
private fun Context.startFloatingService(command: String = "") {
val intent = Intent(this, FloatingService::class.java)
if (command.isNotBlank()) intent.putExtra(INTENT_COMMAND, command)
Log.i("Command", INTENT_COMMAND + command)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
this.startForegroundService(intent)
} else {
this.startService(intent)
}
}
}
```