Stop app when toggling backcompat setting

- Add method to stop package
- Backcompat setting takes two launches right now to take effect.
stop application when backcompat setting is toggled.

Test: m Settings && adb install -r $ANDROID_PRODUCT_OUT/system_ext/priv-app/Settings/Settings.apk
Bug: 389696304
Flag: EXEMPT bug_fix
Change-Id: Iadc8030fe34f66e7eaf854513b14aeb78a556308

res/values/strings.xml

@@ -13097,7 +13097,11 @@
     <string name="page_agnostic_notification_action">Read more</string>
 
     <string name= "enable_16k_app_compat_title">Run app with page size compat mode</string>
-    <string name= "enable_16k_app_compat_details">App will be run in page size compatibility mode on 16 KB device when toggled.</string>
+    <string name= "enable_16k_app_compat_details">App will be forced stopped and run in page size compatibility mode on 16 KB device when toggled.</string>
+
+    <string name="stop_app_dlg_title">Stop app?</string>
+    <!-- [CHAR LIMIT=200] Manage applications, text for dialog when killing persistent apps-->
+    <string name="stop_app_dlg_text">Application will be stopped to apply page size compat setting.</string>
 
     <!-- DSU Loader. Do not translate. -->
 

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

@@ -170,7 +170,7 @@ private fun AppInfoSettings(packageInfoPresenter: PackageInfoPresenter) {
             InteractAcrossProfilesDetailsPreference(app)
             AlarmsAndRemindersAppListProvider.InfoPageEntryItem(app)
             WriteSystemPreferencesAppListProvider.InfoPageEntryItem(app)
-            Enable16KbAppCompatPreference(app)
+            Enable16KbAppCompatPreference(app, packageInfoPresenter)
         }
 
         Category(title = stringResource(R.string.app_install_details_group_title)) {

src/com/android/settings/spa/app/appinfo/Enable16KbAppCompatPreference.kt

@@ -16,8 +16,12 @@
 
 package com.android.settings.spa.app.appinfo
 
+import android.app.AlertDialog
+import android.app.settings.SettingsEnums
 import android.content.Context
+import android.content.DialogInterface
 import android.content.pm.ApplicationInfo
+import android.os.UserManager
 import android.util.Log
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
@@ -26,17 +30,23 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.android.settings.R
 import com.android.settings.development.Enable16kUtils
 import com.android.settings.flags.Flags
+import com.android.settingslib.RestrictedLockUtils
+import com.android.settingslib.RestrictedLockUtilsInternal
 import com.android.settingslib.spa.framework.compose.OverridableFlow
+import com.android.settingslib.spa.widget.dialog.AlertDialogButton
+import com.android.settingslib.spa.widget.dialog.rememberAlertDialogPresenter
 import com.android.settingslib.spa.widget.preference.SwitchPreference
 import com.android.settingslib.spa.widget.preference.SwitchPreferenceModel
+import com.android.settingslib.spaprivileged.model.app.userId
 import kotlinx.coroutines.flow.flow
 
 @Composable
 fun Enable16KbAppCompatPreference(
-    app: ApplicationInfo
+    app: ApplicationInfo,
+    packageInfoPresenter: PackageInfoPresenter
 ) {
     val context = LocalContext.current
-    val presenter = remember(app) { Enable16KbAppCompatSwitchPresenter(context, app) }
+    val presenter = remember(app) { Enable16KbAppCompatSwitchPresenter(context, app, packageInfoPresenter) }
     if (!presenter.isAvailable()) return
 
     val isCheckedState = presenter.isCheckedFlow.collectAsStateWithLifecycle(initialValue = null)
@@ -58,7 +68,9 @@ fun Enable16KbAppCompatPreference(
     })
 }
 
-private class Enable16KbAppCompatSwitchPresenter(context: Context, private val app: ApplicationInfo) {
+
+private class Enable16KbAppCompatSwitchPresenter(private val context: Context, private val app: ApplicationInfo,
+                                                 private val packageInfoPresenter: PackageInfoPresenter) {
     private val packageManager = context.packageManager
     fun isAvailable(): Boolean {
         return Enable16kUtils.isUsing16kbPages() && Flags.pageSizeAppCompatSetting()
@@ -69,13 +81,48 @@ private class Enable16KbAppCompatSwitchPresenter(context: Context, private val a
     })
 
     val isCheckedFlow = isChecked.flow
+
     fun onCheckedChange(newChecked: Boolean) {
         try {
-            packageManager.setPageSizeAppCompatFlagsSettingsOverride(app.packageName, newChecked)
+            getForceStopRestriction(app)?.let { admin ->
-            isChecked.override(newChecked)
+                RestrictedLockUtils.sendShowAdminSupportDetailsIntent(context, admin)
+                return
+            }
+            showDialog(newChecked)
         } catch (e: RuntimeException) {
             Log.e("Enable16KbAppCompat", "Failed to set" +
                     "setPageSizeAppCompatModeSettingsOverride", e);
         }
     }
+
+    fun updatePageSizeCompat(newChecked: Boolean) {
+        packageManager.setPageSizeAppCompatFlagsSettingsOverride(app.packageName, newChecked)
+        isChecked.override(newChecked)
+        packageInfoPresenter.stopPackage()
+    }
+
+    fun getForceStopRestriction(app: ApplicationInfo): RestrictedLockUtils.EnforcedAdmin? = when {
+        packageManager.isPackageStateProtected(app.packageName, app.userId) -> {
+            RestrictedLockUtilsInternal.getDeviceOwner(context) ?: RestrictedLockUtils.EnforcedAdmin()
+        }
+
+        else -> RestrictedLockUtilsInternal.checkIfRestrictionEnforced(
+                context, UserManager.DISALLOW_APPS_CONTROL, app.userId
+        )
+    }
+
+    fun showDialog(newChecked: Boolean) {
+        // Uses the same string from 'Force Stop' action button.
+        val builder =
+                AlertDialog.Builder(context)
+                        .setTitle(R.string.stop_app_dlg_title)
+                        .setMessage(R.string.stop_app_dlg_text)
+                        .setNegativeButton(R.string.cancel, null)
+                        .setPositiveButton(R.string.okay,  DialogInterface.OnClickListener { dialog, _ ->
+                                updatePageSizeCompat(newChecked)
+                                dialog.dismiss()
+                            })
+                        .create();
+        builder.show();
+    }
 }

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

@@ -185,6 +185,16 @@ class PackageInfoPresenter(
         }
     }
 
+    /* stops application without durable effects of the full-scale "forec stop" */
+    fun stopPackage() {
+        requireAuthAndExecute {
+            coroutineScope.launch(Dispatchers.Default) {
+                Log.d(TAG, "Stopping package $packageName for user")
+                context.activityManager.stopPackageForUser(packageName)
+            }
+        }
+    }
+
     fun logAction(category: Int) {
         metricsFeatureProvider.action(context, category, packageName)
     }