Andres Sandoval
2 years ago
committed by
GitHub
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// This file contains classes (with possible wildcards) that the Compose Compiler will treat as stable.
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// It allows us to define classes that our not part of our codebase without wrapping them in a stable class.
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// For more information, check https://developer.android.com/jetpack/compose/performance/stability/fix#configuration-file
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java.time.ZoneId
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java.time.ZoneOffset
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/*
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* Copyright 2024 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.core.data.test
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import com.google.samples.apps.nowinandroid.core.data.util.TimeZoneMonitor
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.flowOf
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import kotlinx.datetime.TimeZone
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import javax.inject.Inject
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class DefaultZoneIdTimeZoneMonitor @Inject constructor() : TimeZoneMonitor {
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override val currentTimeZone: Flow<TimeZone> = flowOf(TimeZone.of("Europe/Warsaw"))
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}
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/*
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* Copyright 2024 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.core.data.util
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import android.content.BroadcastReceiver
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import android.content.Context
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import android.content.Intent
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import android.content.IntentFilter
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import android.os.Build.VERSION
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import android.os.Build.VERSION_CODES
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import androidx.tracing.trace
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import com.google.samples.apps.nowinandroid.core.network.Dispatcher
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import com.google.samples.apps.nowinandroid.core.network.NiaDispatchers.IO
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import com.google.samples.apps.nowinandroid.core.network.di.ApplicationScope
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import dagger.hilt.android.qualifiers.ApplicationContext
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import kotlinx.coroutines.CoroutineDispatcher
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.channels.awaitClose
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.SharedFlow
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import kotlinx.coroutines.flow.SharingStarted
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import kotlinx.coroutines.flow.callbackFlow
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import kotlinx.coroutines.flow.conflate
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import kotlinx.coroutines.flow.distinctUntilChanged
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import kotlinx.coroutines.flow.flowOn
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import kotlinx.coroutines.flow.shareIn
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import kotlinx.datetime.TimeZone
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import kotlinx.datetime.toKotlinTimeZone
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import java.time.ZoneId
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import javax.inject.Inject
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import javax.inject.Singleton
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/**
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* Utility for reporting current timezone the device has set.
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* It always emits at least once with default setting and then for each TZ change.
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*/
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interface TimeZoneMonitor {
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val currentTimeZone: Flow<TimeZone>
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}
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@Singleton
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internal class TimeZoneBroadcastMonitor @Inject constructor(
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@ApplicationContext private val context: Context,
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@ApplicationScope appScope: CoroutineScope,
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@Dispatcher(IO) private val ioDispatcher: CoroutineDispatcher,
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) : TimeZoneMonitor {
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override val currentTimeZone: SharedFlow<TimeZone> =
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callbackFlow {
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// Send the default time zone first.
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trySend(TimeZone.currentSystemDefault())
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// Registers BroadcastReceiver for the TimeZone changes
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val receiver = object : BroadcastReceiver() {
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override fun onReceive(context: Context, intent: Intent) {
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if (intent.action != Intent.ACTION_TIMEZONE_CHANGED) return
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val zoneIdFromIntent = if (VERSION.SDK_INT < VERSION_CODES.R) {
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null
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} else {
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// Starting Android R we also get the new TimeZone.
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intent.getStringExtra(Intent.EXTRA_TIMEZONE)?.let { timeZoneId ->
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// We need to convert it from java.util.Timezone to java.time.ZoneId
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val zoneId = ZoneId.of(timeZoneId, ZoneId.SHORT_IDS)
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// Convert to kotlinx.datetime.TimeZone
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zoneId.toKotlinTimeZone()
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}
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}
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// If there isn't a zoneId in the intent, fallback to the systemDefault, which should also reflect the change
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trySend(zoneIdFromIntent ?: TimeZone.currentSystemDefault())
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}
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}
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trace("TimeZoneBroadcastReceiver.register") {
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context.registerReceiver(receiver, IntentFilter(Intent.ACTION_TIMEZONE_CHANGED))
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}
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// Send here again, because registering the Broadcast Receiver can take up to several milliseconds.
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// This way, we can reduce the likelihood that a TZ change wouldn't be caught with the Broadcast Receiver.
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trySend(TimeZone.currentSystemDefault())
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awaitClose {
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context.unregisterReceiver(receiver)
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}
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}
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// We use to prevent multiple emissions of the same type, because we use trySend multiple times.
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.distinctUntilChanged()
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.conflate()
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.flowOn(ioDispatcher)
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// Sharing the callback to prevent multiple BroadcastReceivers being registered
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.shareIn(appScope, SharingStarted.WhileSubscribed(5_000), 1)
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}
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