diff --git a/packages/SystemUI/src/com/android/systemui/usb/UsbPermissionActivity.java b/packages/SystemUI/src/com/android/systemui/usb/UsbPermissionActivity.java
index 98b4209ede001..bfa50bcee2703 100644
--- a/packages/SystemUI/src/com/android/systemui/usb/UsbPermissionActivity.java
+++ b/packages/SystemUI/src/com/android/systemui/usb/UsbPermissionActivity.java
@@ -36,6 +36,7 @@ import android.os.UserHandle;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
+import android.view.WindowManager;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
 import android.widget.TextView;
@@ -63,6 +64,8 @@ public class UsbPermissionActivity extends AlertActivity
     public void onCreate(Bundle icicle) {
         super.onCreate(icicle);
 
+        getWindow().addPrivateFlags(
+                WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
         Intent intent = getIntent();
         mDevice = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
         mAccessory = (UsbAccessory)intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
diff --git a/packages/SystemUI/tests/AndroidManifest.xml b/packages/SystemUI/tests/AndroidManifest.xml
index f1c687ff32244..2c9c980322459 100644
--- a/packages/SystemUI/tests/AndroidManifest.xml
+++ b/packages/SystemUI/tests/AndroidManifest.xml
@@ -93,6 +93,13 @@
         <activity android:name="com.android.systemui.screenshot.RecyclerViewActivity"
                   android:exported="false" />
 
+        <!-- started from UsbDeviceSettingsManager -->
+        <activity android:name=".usb.UsbPermissionActivityTest$UsbPermissionActivityTestable"
+                  android:exported="false"
+                  android:theme="@style/Theme.SystemUI.Dialog.Alert"
+                  android:finishOnCloseSystemDialogs="true"
+                  android:excludeFromRecents="true" />
+
         <provider
             android:name="androidx.lifecycle.ProcessLifecycleOwnerInitializer"
             tools:replace="android:authorities"
diff --git a/packages/SystemUI/tests/src/com/android/systemui/usb/UsbPermissionActivityTest.kt b/packages/SystemUI/tests/src/com/android/systemui/usb/UsbPermissionActivityTest.kt
new file mode 100644
index 0000000000000..eebcbe63d004d
--- /dev/null
+++ b/packages/SystemUI/tests/src/com/android/systemui/usb/UsbPermissionActivityTest.kt
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2021 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.systemui.usb
+
+import android.app.PendingIntent
+import android.content.Intent
+import android.hardware.usb.IUsbSerialReader
+import android.hardware.usb.UsbAccessory
+import android.hardware.usb.UsbManager
+import android.testing.AndroidTestingRunner
+import android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS
+import androidx.test.filters.SmallTest
+import androidx.test.rule.ActivityTestRule
+import com.android.systemui.SysuiTestCase
+import com.google.common.truth.Truth.assertThat
+import org.junit.After
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.lang.Exception
+
+/**
+ * UsbPermissionActivityTest
+ */
+@RunWith(AndroidTestingRunner::class)
+@SmallTest
+class UsbPermissionActivityTest : SysuiTestCase() {
+
+    class UsbPermissionActivityTestable : UsbPermissionActivity()
+
+    @Rule
+    @JvmField
+    var activityRule = ActivityTestRule<UsbPermissionActivityTestable>(
+            UsbPermissionActivityTestable::class.java, false, false)
+
+    private val activityIntent = Intent(mContext, UsbPermissionActivityTestable::class.java)
+            .apply {
+                flags = Intent.FLAG_ACTIVITY_NEW_TASK
+                putExtra(UsbManager.EXTRA_PACKAGE, "com.android.systemui")
+                putExtra(Intent.EXTRA_INTENT, PendingIntent.getBroadcast(
+                        mContext,
+                        334,
+                        Intent("NO_ACTION"),
+                        PendingIntent.FLAG_MUTABLE))
+                putExtra(UsbManager.EXTRA_ACCESSORY, UsbAccessory(
+                        "manufacturer",
+                        "model",
+                        "description",
+                        "version",
+                        "uri",
+                        object : IUsbSerialReader.Stub() {
+                            override fun getSerial(packageName: String): String {
+                                return "serial"
+                            }
+                        }))
+            }
+
+    @Before
+    fun setUp() {
+        activityRule.launchActivity(activityIntent)
+    }
+
+    @After
+    fun tearDown() {
+        activityRule.finishActivity()
+    }
+
+    @Test
+    @Throws(Exception::class)
+    fun testHideNonSystemOverlay() {
+        assertThat(activityRule.activity.window.attributes.privateFlags and
+                SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS)
+                .isEqualTo(SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS)
+    }
+}