Add AppPermissionPreference for Spa

This is the permission preference in the App Settings page.
The summary is single line.

Add the first Kotlin Robolectric Test for Settings, since Kotlin is not
directly supported by the Robolectric test, using a Java class as a
wrapper.

Bug: 236346018
Test: Manual with App Settings page
Test: Robolectric Test
Change-Id: Ic5a4f7d965885a9cd143428a8cd1900981e316a9

src/com/android/settings/spa/app/appsettings/AppPermissionPreference.kt

@@ -0,0 +1,70 @@
+/*
+ * 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.appsettings
+
+import android.content.ActivityNotFoundException
+import android.content.Context
+import android.content.Intent
+import android.content.pm.ApplicationInfo
+import android.util.Log
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.livedata.observeAsState
+import androidx.compose.runtime.remember
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import com.android.settings.R
+import com.android.settingslib.spa.widget.preference.Preference
+import com.android.settingslib.spa.widget.preference.PreferenceModel
+import com.android.settingslib.spaprivileged.model.app.userHandle
+
+private const val TAG = "AppPermissionPreference"
+private const val EXTRA_HIDE_INFO_BUTTON = "hideInfoButton"
+
+@Composable
+fun AppPermissionPreference(app: ApplicationInfo) {
+    val context = LocalContext.current
+    val summaryLiveData = remember { AppPermissionSummaryLiveData(context, app) }
+    val summaryState = summaryLiveData.observeAsState(initial = AppPermissionSummaryState(
+        summary = stringResource(R.string.summary_placeholder),
+        enabled = false,
+    ))
+    Preference(
+        model = remember {
+            object : PreferenceModel {
+                override val title = context.getString(R.string.permissions_label)
+                override val summary = derivedStateOf { summaryState.value.summary }
+                override val enabled = derivedStateOf { summaryState.value.enabled }
+                override val onClick = { startManagePermissionsActivity(context, app) }
+            }
+        },
+        singleLineSummary = true,
+    )
+}
+
+/** Starts new activity to manage app permissions */
+private fun startManagePermissionsActivity(context: Context, app: ApplicationInfo) {
+    val intent = Intent(Intent.ACTION_MANAGE_APP_PERMISSIONS).apply {
+        putExtra(Intent.EXTRA_PACKAGE_NAME, app.packageName)
+        putExtra(EXTRA_HIDE_INFO_BUTTON, true)
+    }
+    try {
+        context.startActivityAsUser(intent, app.userHandle)
+    } catch (e: ActivityNotFoundException) {
+        Log.w(TAG, "No app can handle android.intent.action.MANAGE_APP_PERMISSIONS")
+    }
+}

src/com/android/settings/spa/app/appsettings/AppPermissionSummary.kt

@@ -0,0 +1,102 @@
+/*
+ * 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.appsettings
+
+import android.content.Context
+import android.content.pm.ApplicationInfo
+import android.content.pm.PackageManager.OnPermissionsChangedListener
+import android.icu.text.ListFormatter
+import androidx.lifecycle.LiveData
+import com.android.settings.R
+import com.android.settingslib.applications.PermissionsSummaryHelper
+import com.android.settingslib.applications.PermissionsSummaryHelper.PermissionsResultCallback
+import com.android.settingslib.spaprivileged.model.app.userHandle
+
+data class AppPermissionSummaryState(
+    val summary: String,
+    val enabled: Boolean,
+)
+
+class AppPermissionSummaryLiveData(
+    private val context: Context,
+    private val app: ApplicationInfo,
+) : LiveData<AppPermissionSummaryState>() {
+    private val contextAsUser = context.createContextAsUser(app.userHandle, 0)
+    private val packageManager = contextAsUser.packageManager
+
+    private val onPermissionsChangedListener = OnPermissionsChangedListener { uid ->
+        if (uid == app.uid) update()
+    }
+
+    override fun onActive() {
+        packageManager.addOnPermissionsChangeListener(onPermissionsChangedListener)
+        update()
+    }
+
+    override fun onInactive() {
+        packageManager.removeOnPermissionsChangeListener(onPermissionsChangedListener)
+    }
+
+    private fun update() {
+        PermissionsSummaryHelper.getPermissionSummary(
+            contextAsUser, app.packageName, permissionsCallback
+        )
+    }
+
+    private val permissionsCallback = object : PermissionsResultCallback {
+        override fun onPermissionSummaryResult(
+            requestedPermissionCount: Int,
+            additionalGrantedPermissionCount: Int,
+            grantedGroupLabels: List<CharSequence>,
+        ) {
+            if (requestedPermissionCount == 0) {
+                postValue(noPermissionRequestedState())
+                return
+            }
+            val labels = getDisplayLabels(additionalGrantedPermissionCount, grantedGroupLabels)
+            val summary = when {
+                labels.isEmpty() -> {
+                    context.getString(R.string.runtime_permissions_summary_no_permissions_granted)
+                }
+
+                else -> ListFormatter.getInstance().format(labels)
+            }
+            postValue(AppPermissionSummaryState(summary = summary, enabled = true))
+        }
+    }
+
+    private fun noPermissionRequestedState() = AppPermissionSummaryState(
+        summary = context.getString(R.string.runtime_permissions_summary_no_permissions_requested),
+        enabled = false,
+    )
+
+    private fun getDisplayLabels(
+        additionalGrantedPermissionCount: Int,
+        grantedGroupLabels: List<CharSequence>,
+    ): List<CharSequence> = when (additionalGrantedPermissionCount) {
+        0 -> grantedGroupLabels
+        else -> {
+            grantedGroupLabels +
+                // N additional permissions.
+                context.resources.getQuantityString(
+                    R.plurals.runtime_permissions_additional_count,
+                    additionalGrantedPermissionCount,
+                    additionalGrantedPermissionCount,
+                )
+        }
+    }
+}

src/com/android/settings/spa/app/appsettings/AppSettings.kt

@@ -90,6 +90,8 @@ private fun AppSettings(packageInfoPresenter: PackageInfoPresenter) {
 
         AppButtons(packageInfoPresenter)
 
+        AppPermissionPreference(app)
+
         Category(title = stringResource(R.string.advanced_apps)) {
             DisplayOverOtherAppsAppListProvider.InfoPageEntryItem(app)
             ModifySystemSettingsAppListProvider.InfoPageEntryItem(app)