diff --git a/src/com/android/settings/Utils.java b/src/com/android/settings/Utils.java
index 0142ea2..9eeabe8 100644
--- a/src/com/android/settings/Utils.java
+++ b/src/com/android/settings/Utils.java
@@ -25,6 +25,7 @@
 import android.app.ActivityManager;
 import android.app.AlertDialog;
 import android.app.AppGlobals;
+import android.app.AppOpsManager;
 import android.app.Dialog;
 import android.app.Fragment;
 import android.app.IActivityManager;
@@ -1272,6 +1273,20 @@
         return info.enabled ? R.string.installed : R.string.disabled;
     }
 
+    /**
+     * Control if other apps can display overlays. By default this is allowed. Be sure to
+     * re-enable overlays, as the effect is system-wide.
+     */
+    public static void setOverlayAllowed(Context context, IBinder token, boolean allowed) {
+        AppOpsManager appOpsManager = context.getSystemService(AppOpsManager.class);
+        if (appOpsManager != null) {
+            appOpsManager.setUserRestriction(AppOpsManager.OP_SYSTEM_ALERT_WINDOW,
+                    !allowed, token);
+            appOpsManager.setUserRestriction(AppOpsManager.OP_TOAST_WINDOW,
+                    !allowed, token);
+        }
+    }
+
     private static boolean isVolumeValid(VolumeInfo volume) {
         return (volume != null) && (volume.getType() == VolumeInfo.TYPE_PRIVATE)
                 && volume.isMountedReadable();
diff --git a/src/com/android/settings/accessibility/AccessibilityServiceWarning.java b/src/com/android/settings/accessibility/AccessibilityServiceWarning.java
index e0c58db..0a6932f 100644
--- a/src/com/android/settings/accessibility/AccessibilityServiceWarning.java
+++ b/src/com/android/settings/accessibility/AccessibilityServiceWarning.java
@@ -48,14 +48,14 @@
                 .setTitle(parentActivity.getString(R.string.enable_service_title,
                         getServiceName(parentActivity, info)))
                 .setView(createEnableDialogContentView(parentActivity, info))
-                .setCancelable(true)
                 .setPositiveButton(android.R.string.ok, listener)
                 .setNegativeButton(android.R.string.cancel, listener)
                 .create();
 
         final View.OnTouchListener filterTouchListener = (View v, MotionEvent event) -> {
             // Filter obscured touches by consuming them.
-            if ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_PARTIALLY_OBSCURED) != 0) {
+            if (((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0)
+                    || ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_PARTIALLY_OBSCURED) != 0)) {
                 if (event.getAction() == MotionEvent.ACTION_UP) {
                     Toast.makeText(v.getContext(), R.string.touch_filtered_warning,
                             Toast.LENGTH_SHORT).show();
@@ -67,6 +67,8 @@
 
         ad.create();
         ad.getButton(AlertDialog.BUTTON_POSITIVE).setOnTouchListener(filterTouchListener);
+        ad.setCanceledOnTouchOutside(true);
+
         return ad;
     }
 
diff --git a/src/com/android/settings/accessibility/ShortcutServicePickerFragment.java b/src/com/android/settings/accessibility/ShortcutServicePickerFragment.java
index d7749ea..ae57f06 100644
--- a/src/com/android/settings/accessibility/ShortcutServicePickerFragment.java
+++ b/src/com/android/settings/accessibility/ShortcutServicePickerFragment.java
@@ -16,26 +16,24 @@
 package com.android.settings.accessibility;
 
 import static android.content.DialogInterface.BUTTON_POSITIVE;
+import static com.android.settings.Utils.setOverlayAllowed;
 
 import android.accessibilityservice.AccessibilityServiceInfo;
 import android.app.Activity;
-import android.app.AlertDialog;
 import android.app.Dialog;
 import android.app.DialogFragment;
 import android.app.Fragment;
 import android.content.ComponentName;
 import android.content.DialogInterface;
-import android.content.pm.PackageManager;
-import android.content.pm.PackageParser;
+import android.os.Binder;
 import android.os.Bundle;
+import android.os.IBinder;
 import android.os.UserHandle;
 import android.provider.Settings;
-import android.support.v7.preference.Preference;
 import android.text.TextUtils;
 import android.view.accessibility.AccessibilityManager;
 
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
-import com.android.settings.DialogCreatable;
 import com.android.settings.applications.defaultapps.DefaultAppInfo;
 import com.android.settings.applications.defaultapps.DefaultAppPickerFragment;
 import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
@@ -118,6 +116,7 @@
             implements DialogInterface.OnClickListener {
         private static final String EXTRA_KEY = "extra_key";
         private static final String TAG = "ConfirmationDialogFragment";
+        private IBinder mToken;
 
         public static ConfirmationDialogFragment newInstance(ShortcutServicePickerFragment parent,
                 String key) {
@@ -126,6 +125,7 @@
             argument.putString(EXTRA_KEY, key);
             fragment.setArguments(argument);
             fragment.setTargetFragment(parent, 0);
+            fragment.mToken = new Binder();
             return fragment;
         }
 
@@ -147,6 +147,22 @@
         }
 
         @Override
+        public void onResume() {
+            super.onResume();
+            if (mToken != null) {
+                setOverlayAllowed(getActivity(), mToken, false);
+            }
+        }
+
+        @Override
+        public void onPause() {
+            super.onPause();
+            if (mToken != null) {
+                setOverlayAllowed(getActivity(), mToken, true);
+            }
+        }
+
+        @Override
         public void onClick(DialogInterface dialog, int which) {
             final Fragment fragment = getTargetFragment();
             if ((which == BUTTON_POSITIVE) && (fragment instanceof DefaultAppPickerFragment)) {
diff --git a/src/com/android/settings/accessibility/ToggleAccessibilityServicePreferenceFragment.java b/src/com/android/settings/accessibility/ToggleAccessibilityServicePreferenceFragment.java
index 04aa5e4..e9fe6e9 100644
--- a/src/com/android/settings/accessibility/ToggleAccessibilityServicePreferenceFragment.java
+++ b/src/com/android/settings/accessibility/ToggleAccessibilityServicePreferenceFragment.java
@@ -26,8 +26,10 @@
 import android.content.Intent;
 import android.content.pm.ResolveInfo;
 import android.net.Uri;
+import android.os.Binder;
 import android.os.Bundle;
 import android.os.Handler;
+import android.os.IBinder;
 import android.os.UserHandle;
 import android.os.storage.StorageManager;
 import android.provider.Settings;
@@ -47,6 +49,8 @@
 
 import java.util.List;
 
+import static com.android.settings.Utils.setOverlayAllowed;
+
 public class ToggleAccessibilityServicePreferenceFragment
         extends ToggleFeaturePreferenceFragment implements DialogInterface.OnClickListener {
 
@@ -69,6 +73,8 @@
 
     private int mShownDialogId;
 
+    private final IBinder mToken = new Binder();
+
     @Override
     public int getMetricsCategory() {
         return MetricsEvent.ACCESSIBILITY_SERVICE;
@@ -99,12 +105,18 @@
     public void onResume() {
         mSettingsContentObserver.register(getContentResolver());
         updateSwitchBarToggleSwitch();
+        if (mToken != null) {
+            setOverlayAllowed(getActivity(), mToken, false);
+        }
         super.onResume();
     }
 
     @Override
     public void onPause() {
         mSettingsContentObserver.unregister(getContentResolver());
+        if (mToken != null) {
+            setOverlayAllowed(getActivity(), mToken, true);
+        }
         super.onPause();
     }