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media store monitoring: safer initialization

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This commit is contained in:
Thibault Deckers 2021-02-03 18:26:29 +09:00
parent 45ba3155b0
commit c90e0df6af
1 changed files with 7 additions and 4 deletions
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11
android/app/src/main/kotlin/deckers/thibault/aves/channel/streams/ContentChangeStreamHandler.kt
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@ -12,6 +12,11 @@ import io.flutter.plugin.common.EventChannel
import io.flutter.plugin.common.EventChannel.EventSink import io.flutter.plugin.common.EventChannel.EventSink
class ContentChangeStreamHandler(private val context: Context) : EventChannel.StreamHandler { class ContentChangeStreamHandler(private val context: Context) : EventChannel.StreamHandler {
// cannot use `lateinit` because we cannot guarantee
// its initialization in `onListen` at the right time
private var eventSink: EventSink? = null
private var handler: Handler? = null
private val contentObserver = object : ContentObserver(null) { private val contentObserver = object : ContentObserver(null) {
override fun onChange(selfChange: Boolean) { override fun onChange(selfChange: Boolean) {
this.onChange(selfChange, null) this.onChange(selfChange, null)
@ -23,8 +28,6 @@ class ContentChangeStreamHandler(private val context: Context) : EventChannel.St
success(uri?.toString()) success(uri?.toString())
} }
} }
private lateinit var eventSink: EventSink
private lateinit var handler: Handler
init { init {
context.contentResolver.apply { context.contentResolver.apply {
@ -45,9 +48,9 @@ class ContentChangeStreamHandler(private val context: Context) : EventChannel.St
} }
private fun success(uri: String?) { private fun success(uri: String?) {
handler.post { handler?.post {
try { try {
eventSink.success(uri) eventSink?.success(uri)
} catch (e: Exception) { } catch (e: Exception) {
Log.w(LOG_TAG, "failed to use event sink", e) Log.w(LOG_TAG, "failed to use event sink", e)
} }