Add AppNotificationPreference to App Info Settings

This is only for the App Info Settings page, which is planed to be
migrated to SPA in Android U.

Currently protected by flag settings_enable_spa, default false.

This will not impacted the AppNotificationSettings, which has no plan
to be migrated.

Bug: 236346018
Test: Unit test
Test: Manual with Settings App
Change-Id: I4ae669ce36eb6ab73f1adf99585f424e03bf90fb

src/com/android/settings/spa/app/appinfo/AppInfoSettings.kt

@@ -95,7 +95,7 @@ private fun AppInfoSettings(packageInfoPresenter: PackageInfoPresenter) {
 
         AppSettingsPreference(app)
         AppAllServicesPreference(app)
-        // TODO: notification_settings
+        AppNotificationPreference(app)
         AppPermissionPreference(app)
         AppStoragePreference(app)
         InstantAppDomainsPreference(app)

src/com/android/settings/spa/app/appinfo/AppNotificationPreference.kt

@@ -0,0 +1,67 @@
+/*
+* Copyright (C) 2022 The Android Open Source Project
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+package com.android.settings.spa.app.appinfo
+
+import android.content.Context
+import android.content.pm.ApplicationInfo
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.lifecycle.compose.ExperimentalLifecycleComposeApi
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.android.settings.R
+import com.android.settings.applications.appinfo.AppInfoDashboardFragment
+import com.android.settings.notification.app.AppNotificationSettings
+import com.android.settings.spa.notification.AppNotificationRepository
+import com.android.settings.spa.notification.IAppNotificationRepository
+import com.android.settingslib.spa.framework.compose.rememberContext
+import com.android.settingslib.spa.widget.preference.Preference
+import com.android.settingslib.spa.widget.preference.PreferenceModel
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.flowOn
+
+@OptIn(ExperimentalLifecycleComposeApi::class)
+@Composable
+fun AppNotificationPreference(
+    app: ApplicationInfo,
+    repository: IAppNotificationRepository = rememberContext(::AppNotificationRepository),
+) {
+    val context = LocalContext.current
+    val summaryFlow = remember(app) {
+        flow {
+            emit(repository.getNotificationSummary(app))
+        }.flowOn(Dispatchers.IO)
+    }
+    Preference(object : PreferenceModel {
+        override val title = stringResource(R.string.notifications_label)
+        override val summary = summaryFlow.collectAsStateWithLifecycle(
+            initialValue = stringResource(R.string.summary_placeholder)
+        )
+        override val onClick = { navigateToAppNotificationSettings(context, app) }
+    })
+}
+
+private fun navigateToAppNotificationSettings(context: Context, app: ApplicationInfo) {
+    AppInfoDashboardFragment.startAppInfoFragment(
+        AppNotificationSettings::class.java,
+        app,
+        context,
+        AppInfoSettingsProvider.METRICS_CATEGORY,
+    )
+}

src/com/android/settings/spa/notification/AppNotificationRepository.kt

@@ -31,8 +31,10 @@ import android.os.RemoteException
 import android.os.ServiceManager
 import android.util.Log
 import com.android.settings.R
+import com.android.settingslib.spa.framework.util.formatString
 import com.android.settingslib.spaprivileged.model.app.IPackageManagers
 import com.android.settingslib.spaprivileged.model.app.PackageManagers
+import com.android.settingslib.spaprivileged.model.app.userId
 import java.util.concurrent.TimeUnit
 import kotlin.math.max
 import kotlin.math.roundToInt
@@ -50,6 +52,11 @@ data class NotificationSentState(
     var sentCount: Int = 0,
 )
 
+interface IAppNotificationRepository {
+    /** Gets the notification summary for the given application. */
+    fun getNotificationSummary(app: ApplicationInfo): String
+}
+
 class AppNotificationRepository(
     private val context: Context,
     private val packageManagers: IPackageManagers = PackageManagers,
@@ -59,7 +66,7 @@ class AppNotificationRepository(
     private val notificationManager: INotificationManager = INotificationManager.Stub.asInterface(
         ServiceManager.getService(Context.NOTIFICATION_SERVICE)
     ),
-) {
+) : IAppNotificationRepository {
     fun getAggregatedUsageEvents(userIdFlow: Flow<Int>): Flow<Map<String, NotificationSentState>> =
         userIdFlow.map { userId ->
             val aggregatedStats = mutableMapOf<String, NotificationSentState>()
@@ -115,6 +122,58 @@ class AppNotificationRepository(
         }
     }
 
+    override fun getNotificationSummary(app: ApplicationInfo): String {
+        if (!isEnabled(app)) return context.getString(R.string.off)
+        val channelCount = getChannelCount(app)
+        if (channelCount == 0) {
+            return calculateFrequencySummary(getSentCount(app))
+        }
+        val blockedChannelCount = getBlockedChannelCount(app)
+        if (channelCount == blockedChannelCount) return context.getString(R.string.off)
+        val frequencySummary = calculateFrequencySummary(getSentCount(app))
+        if (blockedChannelCount == 0) return frequencySummary
+        return context.getString(
+            R.string.notifications_enabled_with_info,
+            frequencySummary,
+            context.formatString(
+                R.string.notifications_categories_off, "count" to blockedChannelCount
+            )
+        )
+    }
+
+    private fun getSentCount(app: ApplicationInfo): Int {
+        var sentCount = 0
+        queryEventsForPackageForUser(app).forEachNotificationEvent { sentCount++ }
+        return sentCount
+    }
+
+    private fun queryEventsForPackageForUser(app: ApplicationInfo): UsageEvents? {
+        val now = System.currentTimeMillis()
+        val startTime = now - TimeUnit.DAYS.toMillis(DAYS_TO_CHECK)
+        return try {
+            usageStatsManager.queryEventsForPackageForUser(
+                startTime, now, app.userId, app.packageName, context.packageName
+            )
+        } catch (e: RemoteException) {
+            Log.e(TAG, "Failed IUsageStatsManager.queryEventsForPackageForUser(): ", e)
+            null
+        }
+    }
+
+    private fun getChannelCount(app: ApplicationInfo): Int = try {
+        notificationManager.getNumNotificationChannelsForPackage(app.packageName, app.uid, false)
+    } catch (e: Exception) {
+        Log.w(TAG, "Error calling INotificationManager", e)
+        0
+    }
+
+    private fun getBlockedChannelCount(app: ApplicationInfo): Int = try {
+        notificationManager.getBlockedChannelCount(app.packageName, app.uid)
+    } catch (e: Exception) {
+        Log.w(TAG, "Error calling INotificationManager", e)
+        0
+    }
+
     fun calculateFrequencySummary(sentCount: Int): String {
         val dailyFrequency = (sentCount.toFloat() / DAYS_TO_CHECK).roundToInt()
         return if (dailyFrequency > 0) {