Disable managed services special access screens...

... on low ram devices.

- Remove them from the 'Special app access' screen
- Display an error message if an app intents directly to
them

Bug: 35219985
Test: visual, and runtest --path ManagedAccessSettingsLowRamTest.java,
when the device is in low ram mode and when it's not.
Change-Id: Ied919cb248ae56683a00e3492c4737dfd00449ac

src/com/android/settings/Settings.java

@@ -98,6 +98,7 @@ public class Settings extends SettingsActivity {
     public static class DreamSettingsActivity extends SettingsActivity { /* empty */ }
     public static class NotificationStationActivity extends SettingsActivity { /* empty */ }
     public static class UserSettingsActivity extends SettingsActivity { /* empty */ }
+    public static class SpecialAccessSettingsActivity extends SettingsActivity { /* empty */ }
     public static class NotificationAccessSettingsActivity extends SettingsActivity { /* empty */ }
     public static class VrListenersSettingsActivity extends SettingsActivity { /* empty */ }
     public static class PictureInPictureSettingsActivity extends SettingsActivity { /* empty */ }

src/com/android/settings/applications/SpecialAccessSettings.java

@@ -14,8 +14,11 @@
 
 package com.android.settings.applications;
 
+import android.app.ActivityManager;
 import android.content.Context;
+import android.os.Bundle;
 import android.provider.SearchIndexableResource;
+import android.support.v7.preference.Preference;
 
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.R;
@@ -31,6 +34,9 @@ public class SpecialAccessSettings extends DashboardFragment {
 
     private static final String TAG = "SpecialAccessSettings";
 
+    private static final String[] DISABLED_FEATURES_LOW_RAM =
+            new String[] {"notification_access", "zen_access", "enabled_vr_listeners"};
+
     @Override
     protected String getLogTag() {
         return TAG;
@@ -41,6 +47,20 @@ public class SpecialAccessSettings extends DashboardFragment {
         return R.xml.special_access;
     }
 
+    @Override
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        if (ActivityManager.isLowRamDeviceStatic()) {
+            for (String disabledFeature : DISABLED_FEATURES_LOW_RAM) {
+                Preference pref = findPreference(disabledFeature);
+                if (pref != null) {
+                    removePreference(disabledFeature);
+                }
+            }
+        }
+    }
+
     @Override
     protected List<PreferenceController> getPreferenceControllers(Context context) {
         return null;

src/com/android/settings/core/gateway/SettingsGateway.java

@@ -53,6 +53,7 @@ import com.android.settings.applications.PictureInPictureDetails;
 import com.android.settings.applications.PictureInPictureSettings;
 import com.android.settings.applications.ProcessStatsSummary;
 import com.android.settings.applications.ProcessStatsUi;
+import com.android.settings.applications.SpecialAccessSettings;
 import com.android.settings.applications.UsageAccessDetails;
 import com.android.settings.applications.VrListenerSettings;
 import com.android.settings.applications.WriteSettingsDetails;
@@ -189,6 +190,7 @@ public class SettingsGateway {
             DataUsageSummary.class.getName(),
             DreamSettings.class.getName(),
             UserSettings.class.getName(),
+            SpecialAccessSettings.class.getName(),
             NotificationAccessSettings.class.getName(),
             ZenAccessSettings.class.getName(),
             PrintSettingsFragment.class.getName(),

src/com/android/settings/notification/NotificationAccessSettings.java

@@ -16,21 +16,18 @@
 
 package com.android.settings.notification;
 
+import android.app.ActivityManager;
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.app.Fragment;
-import android.app.NotificationManager;
 import android.content.ComponentName;
-import android.content.Context;
 import android.content.DialogInterface;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.provider.Settings;
 import android.service.notification.NotificationListenerService;
-import android.util.Log;
 
 import com.android.internal.annotations.VisibleForTesting;
-import com.android.internal.logging.MetricsLogger;
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.R;
 import com.android.settings.core.instrumentation.InstrumentedDialogFragment;

src/com/android/settings/notification/ZenAccessSettings.java

@@ -92,19 +92,25 @@ public class ZenAccessSettings extends EmptyTextSettings {
     @Override
     public void onResume() {
         super.onResume();
-        reloadList();
-        getContentResolver().registerContentObserver(
-                Secure.getUriFor(Secure.ENABLED_NOTIFICATION_POLICY_ACCESS_PACKAGES), false,
-                mObserver);
-        getContentResolver().registerContentObserver(
-                Secure.getUriFor(Secure.ENABLED_NOTIFICATION_LISTENERS), false,
-                mObserver);
+        if (!ActivityManager.isLowRamDeviceStatic()) {
+            reloadList();
+            getContentResolver().registerContentObserver(
+                    Secure.getUriFor(Secure.ENABLED_NOTIFICATION_POLICY_ACCESS_PACKAGES), false,
+                    mObserver);
+            getContentResolver().registerContentObserver(
+                    Secure.getUriFor(Secure.ENABLED_NOTIFICATION_LISTENERS), false,
+                    mObserver);
+        } else {
+            setEmptyText(R.string.disabled_low_ram_device);
+        }
     }
 
     @Override
     public void onPause() {
         super.onPause();
-        getContentResolver().unregisterContentObserver(mObserver);
+        if (!ActivityManager.isLowRamDeviceStatic()) {
+            getContentResolver().unregisterContentObserver(mObserver);
+        }
     }
 
     private void reloadList() {

src/com/android/settings/utils/ManagedServiceSettings.java

@@ -17,6 +17,7 @@
 package com.android.settings.utils;
 
 import android.annotation.Nullable;
+import android.app.ActivityManager;
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.app.Fragment;
@@ -91,8 +92,12 @@ public abstract class ManagedServiceSettings extends EmptyTextSettings {
     @Override
     public void onResume() {
         super.onResume();
-        mServiceListing.reload();
-        mServiceListing.setListening(true);
+        if (!ActivityManager.isLowRamDeviceStatic()) {
+            mServiceListing.reload();
+            mServiceListing.setListening(true);
+        } else {
+            setEmptyText(R.string.disabled_low_ram_device);
+        }
     }
 
     @Override
@@ -230,7 +235,6 @@ public abstract class ManagedServiceSettings extends EmptyTextSettings {
     public static class Config {
         public String tag;
         public String setting;
-        public String secondarySetting;
         public String intentAction;
         public String permission;
         public String noun;