Retain the selected filter even after the device orientation change.

The selected filter should be retained displaying the list even after the device orientation change.
Bug: 36380176
Test: atest packages/apps/Settings/tests/uitests/src/com/android/settings/ui/AppsSettingsRetainFilterTests.java

Change-Id: I7830b525343ce597929771ad4db55a803f893432

tests/uitests/src/com/android/settings/ui/AppsSettingsRetainFilterTests.java

@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2018 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.ui;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Intent;
+import android.os.RemoteException;
+import android.provider.Settings;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.uiautomator.By;
+import android.support.test.uiautomator.UiDevice;
+import android.support.test.uiautomator.UiObject2;
+import android.support.test.uiautomator.Until;
+import android.system.helpers.ActivityHelper;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class AppsSettingsRetainFilterTests {
+    private static final int TIMEOUT = 2000;
+    private UiDevice mDevice;
+    private ActivityHelper mActivityHelper = null;
+
+    @Before
+    public void setUp() throws Exception {
+        mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation());
+        mActivityHelper = ActivityHelper.getInstance();
+
+        try {
+            mDevice.setOrientationNatural();
+        } catch (RemoteException e) {
+            throw new RuntimeException("failed to freeze device orientation", e);
+        }
+
+        mDevice.pressHome();
+        mDevice.waitForIdle(TIMEOUT);
+    }
+
+    @Test
+    public void testDisablingSystemAppAndRotateDevice() throws Exception {
+        launchAppsSettings();
+
+        UiObject2 calculator = mDevice.wait(
+                Until.findObject(By.text("Calculator")), TIMEOUT);
+        assertThat(calculator).isNotNull();
+        calculator.click();
+        mDevice.waitForIdle(TIMEOUT);
+
+        UiObject2 disableButton = mDevice.wait(
+                Until.findObject(By.text("DISABLE")), TIMEOUT);
+        assertThat(disableButton).isNotNull();
+        disableButton.click();
+        mDevice.waitForIdle(TIMEOUT);
+
+        // Click on "Disable App" on dialog.
+        UiObject2 dialogDisableButton = mDevice.wait(
+                Until.findObject(By.text("DISABLE APP")), TIMEOUT);
+        assertThat(dialogDisableButton).isNotNull();
+        dialogDisableButton.click();
+        mDevice.waitForIdle(TIMEOUT);
+
+        UiObject2 enableButton = mDevice.wait(
+                Until.findObject(By.text("ENABLE")), TIMEOUT);
+        assertThat(enableButton).isNotNull();
+
+        mDevice.pressBack();
+        mDevice.waitForIdle(TIMEOUT);
+
+        UiObject2 spinnerHeader =  mDevice.wait(
+                Until.findObject(By.text("All apps")), TIMEOUT);
+        assertThat(spinnerHeader).isNotNull();
+        spinnerHeader.click();
+
+        UiObject2 optionDisabledApps =  mDevice.wait(
+                Until.findObject(By.text("Disabled apps")), TIMEOUT);
+        assertThat(optionDisabledApps).isNotNull();
+        optionDisabledApps.click();
+        mDevice.waitForIdle(TIMEOUT);
+
+        try {
+            mDevice.setOrientationLeft();
+            mDevice.waitForIdle(TIMEOUT);
+        } catch (RemoteException e) {
+            throw new RuntimeException("Failed to freeze device orientation", e);
+        }
+
+        try {
+            mDevice.unfreezeRotation();
+            mDevice.waitForIdle(TIMEOUT);
+        } catch (RemoteException e) {
+            throw new RuntimeException("Failed to un-freeze device orientation", e);
+        }
+
+        UiObject2 spinnerDisabledApps =  mDevice.wait(
+                Until.findObject(By.text("Disabled apps")), TIMEOUT);
+        assertThat(spinnerDisabledApps).isNotNull();
+    }
+
+    private void launchAppsSettings() throws Exception {
+        Intent appsSettingsIntent = new
+                Intent(Settings.ACTION_MANAGE_APPLICATIONS_SETTINGS);
+        mActivityHelper.launchIntent(appsSettingsIntent);
+    }
+}