Refactor DynamicIndexableContentMonitor

Refactor content monitoring code into a few singletons to keep alive
while Settings app is running.

Bug: 32995210
Test: Manually installing/uninstalling AOSP LatinIME.apk while
      Settings app is/isn't running, then search AOSP.
Test: Connecting/Disconnecting Anker bluetooth keyboard while Settings
      app is/isn't running, then search Anker.
Test: Added Robolectric test for DynamicIndexableContentMonitor.
Change-Id: I588e33be169fc9677d41c3daa59ab400f04f6419

tests/robotests/src/com/android/settings/search/DynamicIndexableContentMonitorTest.java

@@ -0,0 +1,601 @@
+/*
+ * Copyright (C) 2016 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.search;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyBoolean;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.only;
+import static org.mockito.Mockito.reset;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import android.accessibilityservice.AccessibilityServiceInfo;
+import android.app.Activity;
+import android.app.Application;
+import android.app.LoaderManager;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.Loader;
+import android.content.pm.ActivityInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.content.pm.ServiceInfo;
+import android.database.ContentObserver;
+import android.hardware.input.InputManager;
+import android.net.Uri;
+import android.os.Bundle;
+import android.print.PrintManager;
+import android.print.PrintServicesLoader;
+import android.printservice.PrintServiceInfo;
+import android.provider.UserDictionary;
+import android.view.inputmethod.InputMethodInfo;
+
+import com.android.internal.content.PackageMonitor;
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+import com.android.settings.accessibility.AccessibilitySettings;
+import com.android.settings.inputmethod.InputMethodAndLanguageSettings;
+import com.android.settings.print.PrintSettingsFragment;
+import com.android.settings.testutils.shadow.ShadowActivityWithLoadManager;
+import com.android.settings.testutils.shadow.ShadowContextImplWithRegisterReceiver;
+import com.android.settings.testutils.shadow.ShadowInputManager;
+import com.android.settings.testutils.shadow.ShadowInputMethodManagerWithMethodList;
+import com.android.settings.testutils.shadow.ShadowPackageMonitor;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.verification.VerificationMode;
+import org.robolectric.Robolectric;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+import org.robolectric.internal.ShadowExtractor;
+import org.robolectric.res.builder.RobolectricPackageManager;
+import org.robolectric.shadows.ShadowAccessibilityManager;
+import org.robolectric.shadows.ShadowApplication;
+import org.robolectric.shadows.ShadowContentResolver;
+import org.xmlpull.v1.XmlPullParserException;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(
+        manifest = TestConfig.MANIFEST_PATH,
+        sdk = TestConfig.SDK_VERSION,
+        shadows = {
+                ShadowActivityWithLoadManager.class,
+                ShadowContextImplWithRegisterReceiver.class,
+                ShadowInputManager.class,
+                ShadowInputMethodManagerWithMethodList.class,
+                ShadowPackageMonitor.class,
+        }
+)
+public class DynamicIndexableContentMonitorTest {
+
+    private static final int USER_ID = 5678;
+    private static final int LOADER_ID = 1234;
+    private static final String A11Y_PACKAGE_1 = "a11y-1";
+    private static final String A11Y_PACKAGE_2 = "a11y-2";
+    private static final String IME_PACKAGE_1 = "ime-1";
+    private static final String IME_PACKAGE_2 = "ime-2";
+
+    private LoaderManager mLoaderManager = mock(LoaderManager.class);
+    private Index mIndex = mock(Index.class);
+
+    private Activity mActivity;
+    private InputManager mInputManager;
+
+    private ShadowContextImplWithRegisterReceiver mShadowContextImpl;
+    private ShadowActivityWithLoadManager mShadowActivity;
+    private ShadowAccessibilityManager mShadowAccessibilityManager;
+    private ShadowInputMethodManagerWithMethodList mShadowInputMethodManager;
+    private RobolectricPackageManager mRobolectricPackageManager;
+
+    private final DynamicIndexableContentMonitor mMonitor = new DynamicIndexableContentMonitor();
+
+    @Before
+    public void setUp() {
+        mActivity = Robolectric.buildActivity(Activity.class).get();
+        mInputManager = InputManager.getInstance();
+
+        // Robolectric shadows.
+        mShadowContextImpl = (ShadowContextImplWithRegisterReceiver) ShadowExtractor.extract(
+                ((Application) ShadowApplication.getInstance().getApplicationContext())
+                .getBaseContext());
+        mShadowActivity = (ShadowActivityWithLoadManager) ShadowExtractor.extract(mActivity);
+        mShadowAccessibilityManager = (ShadowAccessibilityManager) ShadowExtractor.extract(
+                mActivity.getSystemService(Context.ACCESSIBILITY_SERVICE));
+        mShadowInputMethodManager = (ShadowInputMethodManagerWithMethodList) ShadowExtractor
+                .extract(mActivity.getSystemService(Context.INPUT_METHOD_SERVICE));
+        mRobolectricPackageManager = RuntimeEnvironment.getRobolectricPackageManager();
+
+        // Setup shadows.
+        mShadowContextImpl.setSystemService(Context.PRINT_SERVICE, mock(PrintManager.class));
+        mShadowContextImpl.setSystemService(Context.INPUT_SERVICE, mInputManager);
+        mShadowActivity.setLoaderManager(mLoaderManager);
+        mShadowAccessibilityManager.setInstalledAccessibilityServiceList(Collections.emptyList());
+        mShadowInputMethodManager.setInputMethodList(Collections.emptyList());
+        mRobolectricPackageManager.setSystemFeature(PackageManager.FEATURE_PRINTING, true);
+        mRobolectricPackageManager.setSystemFeature(PackageManager.FEATURE_INPUT_METHODS, true);
+    }
+
+    @After
+    public void shutDown() {
+        DynamicIndexableContentMonitor.resetForTesting();
+        mRobolectricPackageManager.reset();
+    }
+
+    @Test
+    public void testLockedUser() {
+        mMonitor.register(mActivity, LOADER_ID, mIndex, false /* isUserUnlocked */);
+
+        // No loader procedure happens.
+        verify(mLoaderManager, never()).initLoader(
+                anyInt(), any(Bundle.class), any(LoaderManager.LoaderCallbacks.class));
+        // No indexing happens.
+        verify(mIndex, never()).updateFromClassNameResource(
+                anyString(), anyBoolean(), anyBoolean());
+
+        mMonitor.unregister(mActivity, LOADER_ID);
+
+        // No destroy loader should happen.
+        verify(mLoaderManager, never()).destroyLoader(anyInt());
+    }
+
+    @Test
+    public void testWithNoPrintingFeature() {
+        mRobolectricPackageManager.setSystemFeature(PackageManager.FEATURE_PRINTING, false);
+
+        mMonitor.register(mActivity, LOADER_ID, mIndex, true /* isUserUnlocked */);
+
+        // No loader procedure happens.
+        verify(mLoaderManager, never()).initLoader(
+                anyInt(), any(Bundle.class), any(LoaderManager.LoaderCallbacks.class));
+        verifyNoIndexing(PrintSettingsFragment.class);
+
+        mMonitor.unregister(mActivity, LOADER_ID);
+
+        // No destroy loader should happen.
+        verify(mLoaderManager, never()).destroyLoader(anyInt());
+    }
+
+    @Test
+    public void testPrinterServiceIndex() {
+        mMonitor.register(mActivity, LOADER_ID, mIndex, true /* isUserUnlocked */);
+
+        // Loader procedure happens.
+        verify(mLoaderManager, only()).initLoader(LOADER_ID, null, mMonitor);
+
+        // Loading print services happens.
+        final Loader<List<PrintServiceInfo>> loader =
+                mMonitor.onCreateLoader(LOADER_ID, null /* args */);
+        assertThat(loader).isInstanceOf(PrintServicesLoader.class);
+        verifyNoIndexing(PrintSettingsFragment.class);
+
+        mMonitor.onLoadFinished(loader, Collections.emptyList());
+
+        verifyIncrementalIndexing(PrintSettingsFragment.class);
+    }
+
+    @Test
+    public void testInputDevicesMonitor() {
+        mMonitor.register(mActivity, LOADER_ID, mIndex, true /* isUserUnlocked */);
+
+        // Rebuild indexing should happen.
+        // CAVEAT: Currently InputMethodAndLanuageSettings may be indexed once for input devices and
+        // once for input methods.
+        verifyRebuildIndexing(InputMethodAndLanguageSettings.class, atLeastOnce());
+        // Input monitor should be registered to InputManager.
+        final InputManager.InputDeviceListener listener = extactInputDeviceListener();
+        assertThat(listener).isNotNull();
+
+        /*
+         * Nothing happens on successive register calls.
+         */
+        reset(mIndex);
+
+        mMonitor.register(mActivity, LOADER_ID, mIndex, true /* isUserUnlocked */);
+
+        verifyNoIndexing(InputMethodAndLanguageSettings.class);
+        assertThat(extactInputDeviceListener()).isEqualTo(listener);
+
+        /*
+         * A device is added.
+         */
+        reset(mIndex);
+
+        listener.onInputDeviceAdded(1 /* deviceId */);
+
+        verifyIncrementalIndexing(InputMethodAndLanguageSettings.class);
+
+        /*
+         * A device is removed.
+         */
+        reset(mIndex);
+
+        listener.onInputDeviceRemoved(2 /* deviceId */);
+
+        verifyRebuildIndexing(InputMethodAndLanguageSettings.class);
+
+        /*
+         * A device is changed.
+         */
+        reset(mIndex);
+
+        listener.onInputDeviceChanged(3 /* deviceId */);
+
+        verifyRebuildIndexing(InputMethodAndLanguageSettings.class);
+    }
+
+    @Test
+    public void testAccessibilityServicesMonitor() throws Exception {
+        mMonitor.register(mActivity, LOADER_ID, mIndex, true /* isUserUnlocked */);
+
+        final PackageMonitor packageMonitor = extractPackageMonitor();
+        assertThat(packageMonitor).isNotNull();
+
+        verifyRebuildIndexing(AccessibilitySettings.class);
+
+        /*
+         * When an accessibility service package is installed, incremental indexing happen.
+         */
+        installAccessibilityService(A11Y_PACKAGE_1);
+        reset(mIndex);
+
+        packageMonitor.onPackageAppeared(A11Y_PACKAGE_1, USER_ID);
+        Robolectric.flushBackgroundThreadScheduler();
+
+        verifyIncrementalIndexing(AccessibilitySettings.class);
+
+        /*
+         * When another accessibility service package is installed, incremental indexing happens.
+         */
+        installAccessibilityService(A11Y_PACKAGE_2);
+        reset(mIndex);
+
+        packageMonitor.onPackageAppeared(A11Y_PACKAGE_2, USER_ID);
+        Robolectric.flushBackgroundThreadScheduler();
+
+        verifyIncrementalIndexing(AccessibilitySettings.class);
+
+        /*
+         * When an accessibility service is disabled, rebuild indexing happens.
+         */
+        ((PackageManager) mRobolectricPackageManager).setApplicationEnabledSetting(
+                A11Y_PACKAGE_1, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, 0 /* flags */);
+        reset(mIndex);
+
+        packageMonitor.onPackageModified(A11Y_PACKAGE_1);
+        Robolectric.flushBackgroundThreadScheduler();
+
+        verifyRebuildIndexing(AccessibilitySettings.class);
+
+        /*
+         * When an accessibility service is enabled, incremental indexing happens.
+         */
+        ((PackageManager) mRobolectricPackageManager).setApplicationEnabledSetting(
+                A11Y_PACKAGE_1, PackageManager.COMPONENT_ENABLED_STATE_DEFAULT, 0 /* flags */);
+        reset(mIndex);
+
+        packageMonitor.onPackageModified(A11Y_PACKAGE_1);
+        Robolectric.flushBackgroundThreadScheduler();
+
+        verifyIncrementalIndexing(AccessibilitySettings.class);
+
+        /*
+         * When an accessibility service package is uninstalled, rebuild indexing happens.
+         */
+        uninstallAccessibilityService(A11Y_PACKAGE_1);
+        reset(mIndex);
+
+        packageMonitor.onPackageDisappeared(A11Y_PACKAGE_1, USER_ID);
+
+        verifyRebuildIndexing(AccessibilitySettings.class);
+
+        /*
+         * When an input method service package is installed, nothing happens.
+         */
+        installInputMethodService(IME_PACKAGE_1);
+        reset(mIndex);
+
+        packageMonitor.onPackageAppeared(IME_PACKAGE_1, USER_ID);
+
+        verifyNoIndexing(AccessibilitySettings.class);
+    }
+
+    @Test
+    public void testInputMethodServicesMonitor() throws Exception {
+        mMonitor.register(mActivity, LOADER_ID, mIndex, true /* isUserUnlocked */);
+
+        final PackageMonitor packageMonitor = extractPackageMonitor();
+        assertThat(packageMonitor).isNotNull();
+
+        // CAVEAT: Currently InputMethodAndLanuageSettings may be indexed once for input devices and
+        // once for input methods.
+        verifyRebuildIndexing(InputMethodAndLanguageSettings.class, atLeastOnce());
+
+        /*
+         * When an input method service package is installed, incremental indexing happen.
+         */
+        installInputMethodService(IME_PACKAGE_1);
+        reset(mIndex);
+
+        packageMonitor.onPackageAppeared(IME_PACKAGE_1, USER_ID);
+        Robolectric.flushBackgroundThreadScheduler();
+
+        verifyIncrementalIndexing(InputMethodAndLanguageSettings.class);
+
+        /*
+         * When another input method service package is installed, incremental indexing happens.
+         */
+        installInputMethodService(IME_PACKAGE_2);
+        reset(mIndex);
+
+        packageMonitor.onPackageAppeared(IME_PACKAGE_2, USER_ID);
+        Robolectric.flushBackgroundThreadScheduler();
+
+        verifyIncrementalIndexing(InputMethodAndLanguageSettings.class);
+
+        /*
+         * When an input method service is disabled, rebuild indexing happens.
+         */
+        ((PackageManager) mRobolectricPackageManager).setApplicationEnabledSetting(
+                IME_PACKAGE_1, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, 0 /* flags */);
+        reset(mIndex);
+
+        packageMonitor.onPackageModified(IME_PACKAGE_1);
+        Robolectric.flushBackgroundThreadScheduler();
+
+        verifyRebuildIndexing(InputMethodAndLanguageSettings.class);
+
+        /*
+         * When an input method service is enabled, incremental indexing happens.
+         */
+        ((PackageManager) mRobolectricPackageManager).setApplicationEnabledSetting(
+                IME_PACKAGE_1, PackageManager.COMPONENT_ENABLED_STATE_DEFAULT, 0 /* flags */);
+        reset(mIndex);
+
+        packageMonitor.onPackageModified(IME_PACKAGE_1);
+        Robolectric.flushBackgroundThreadScheduler();
+
+        verifyIncrementalIndexing(InputMethodAndLanguageSettings.class);
+
+        /*
+         * When an input method service package is uninstalled, rebuild indexing happens.
+         */
+        uninstallInputMethodService(IME_PACKAGE_1);
+        reset(mIndex);
+
+        packageMonitor.onPackageDisappeared(IME_PACKAGE_1, USER_ID);
+
+        verifyRebuildIndexing(InputMethodAndLanguageSettings.class);
+
+        /*
+         * When an accessibility service package is installed, nothing happens.
+         */
+        installAccessibilityService(A11Y_PACKAGE_1);
+        reset(mIndex);
+
+        packageMonitor.onPackageAppeared(A11Y_PACKAGE_1, USER_ID);
+
+        verifyNoIndexing(InputMethodAndLanguageSettings.class);
+    }
+
+    @Test
+    public void testUserDictionaryChangeMonitor() throws Exception {
+        mMonitor.register(mActivity, LOADER_ID, mIndex, true /* isUserUnlocked */);
+
+        // Content observer should be registered.
+        final ContentObserver observer = extractContentObserver(UserDictionary.Words.CONTENT_URI);
+        assertThat(observer).isNotNull();
+
+        // CAVEAT: Currently InputMethodAndLanuageSettings may be indexed once for input devices and
+        // once for input methods.
+        verifyRebuildIndexing(InputMethodAndLanguageSettings.class, atLeastOnce());
+
+        /*
+         * When user dictionary content is changed, rebuild indexing happens.
+         */
+        reset(mIndex);
+
+        observer.onChange(false /* selfChange */, UserDictionary.Words.CONTENT_URI);
+
+        verifyRebuildIndexing(InputMethodAndLanguageSettings.class);
+    }
+
+    /*
+     * Verification helpers.
+     */
+
+    private void verifyNoIndexing(Class<?> indexingClass) {
+        verify(mIndex, never()).updateFromClassNameResource(eq(indexingClass.getName()),
+                anyBoolean(), anyBoolean());
+    }
+
+    private void verifyRebuildIndexing(Class<?> indexingClass) {
+        verifyRebuildIndexing(indexingClass, times(1));
+    }
+
+    private void verifyRebuildIndexing(Class<?> indexingClass, VerificationMode verificationMode) {
+        verify(mIndex, verificationMode).updateFromClassNameResource(indexingClass.getName(),
+                true /* rebuild */, true /* includeInSearchResults */);
+        verify(mIndex, never()).updateFromClassNameResource(indexingClass.getName(),
+                false /* rebuild */, true /* includeInSearchResults */);
+    }
+
+    private void verifyIncrementalIndexing(Class<?> indexingClass) {
+        verify(mIndex, times(1)).updateFromClassNameResource(indexingClass.getName(),
+                false /* rebuild */, true /* includeInSearchResults */);
+        verify(mIndex, never()).updateFromClassNameResource(indexingClass.getName(),
+                true /* rebuild */, true /* includeInSearchResults */);
+    }
+
+    /*
+     * Testing helper methods.
+     */
+
+    private InputManager.InputDeviceListener extactInputDeviceListener() {
+        List<InputManager.InputDeviceListener> listeners = ((ShadowInputManager) ShadowExtractor
+                .extract(mInputManager))
+                .getRegisteredInputDeviceListeners();
+        InputManager.InputDeviceListener inputDeviceListener = null;
+        for (InputManager.InputDeviceListener listener : listeners) {
+            if (isUnderTest(listener)) {
+                if (inputDeviceListener != null) {
+                    assertThat(listener).isEqualTo(inputDeviceListener);
+                } else {
+                    inputDeviceListener = listener;
+                }
+            }
+        }
+        return inputDeviceListener;
+    }
+
+    private PackageMonitor extractPackageMonitor() {
+        List<ShadowApplication.Wrapper> receivers = ShadowApplication.getInstance()
+                .getRegisteredReceivers();
+        PackageMonitor packageMonitor = null;
+        for (ShadowApplication.Wrapper wrapper : receivers) {
+            BroadcastReceiver receiver = wrapper.getBroadcastReceiver();
+            if (isUnderTest(receiver) && receiver instanceof PackageMonitor) {
+                if (packageMonitor != null) {
+                    assertThat(receiver).isEqualTo(packageMonitor);
+                } else {
+                    packageMonitor = (PackageMonitor) receiver;
+                }
+            }
+        }
+        return packageMonitor;
+    }
+
+    private ContentObserver extractContentObserver(Uri uri) {
+        ShadowContentResolver contentResolver = (ShadowContentResolver) ShadowExtractor
+                .extract(mActivity.getContentResolver());
+        Collection<ContentObserver> observers = contentResolver.getContentObservers(uri);
+        ContentObserver contentObserver = null;
+        for (ContentObserver observer : observers) {
+            if (isUnderTest(observer)) {
+                if (contentObserver != null) {
+                    assertThat(observer).isEqualTo(contentObserver);
+                } else {
+                    contentObserver = observer;
+                }
+            }
+        }
+        return contentObserver;
+    }
+
+    private void installAccessibilityService(String packageName) throws Exception {
+        final AccessibilityServiceInfo serviceToAdd = buildAccessibilityServiceInfo(packageName);
+
+        final List<AccessibilityServiceInfo> services = new ArrayList<>();
+        services.addAll(mShadowAccessibilityManager.getInstalledAccessibilityServiceList());
+        services.add(serviceToAdd);
+        mShadowAccessibilityManager.setInstalledAccessibilityServiceList(services);
+
+        final Intent intent = DynamicIndexableContentMonitor
+                .getAccessibilityServiceIntent(packageName);
+        mRobolectricPackageManager.addResolveInfoForIntent(intent, serviceToAdd.getResolveInfo());
+        mRobolectricPackageManager.addPackage(packageName);
+    }
+
+    private void uninstallAccessibilityService(String packageName) throws Exception {
+        final AccessibilityServiceInfo serviceToRemove = buildAccessibilityServiceInfo(packageName);
+
+        final List<AccessibilityServiceInfo> services = new ArrayList<>();
+        services.addAll(mShadowAccessibilityManager.getInstalledAccessibilityServiceList());
+        services.remove(serviceToRemove);
+        mShadowAccessibilityManager.setInstalledAccessibilityServiceList(services);
+
+        final Intent intent = DynamicIndexableContentMonitor
+                .getAccessibilityServiceIntent(packageName);
+        mRobolectricPackageManager.removeResolveInfosForIntent(intent, packageName);
+        mRobolectricPackageManager.removePackage(packageName);
+    }
+
+    private void installInputMethodService(String packageName) throws Exception {
+        final ResolveInfo resolveInfoToAdd = buildResolveInfo(packageName, "imeService");
+        final InputMethodInfo serviceToAdd = buildInputMethodInfo(resolveInfoToAdd);
+
+        final List<InputMethodInfo> services = new ArrayList<>();
+        services.addAll(mShadowInputMethodManager.getInputMethodList());
+        services.add(serviceToAdd);
+        mShadowInputMethodManager.setInputMethodList(services);
+
+        final Intent intent = DynamicIndexableContentMonitor.getIMEServiceIntent(packageName);
+        mRobolectricPackageManager.addResolveInfoForIntent(intent, resolveInfoToAdd);
+        mRobolectricPackageManager.addPackage(packageName);
+    }
+
+    private void uninstallInputMethodService(String packageName) throws Exception {
+        final ResolveInfo resolveInfoToRemove = buildResolveInfo(packageName, "imeService");
+        final InputMethodInfo serviceToRemove = buildInputMethodInfo(resolveInfoToRemove);
+
+        final List<InputMethodInfo> services = new ArrayList<>();
+        services.addAll(mShadowInputMethodManager.getInputMethodList());
+        services.remove(serviceToRemove);
+        mShadowInputMethodManager.setInputMethodList(services);
+
+        final Intent intent = DynamicIndexableContentMonitor.getIMEServiceIntent(packageName);
+        mRobolectricPackageManager.removeResolveInfosForIntent(intent, packageName);
+        mRobolectricPackageManager.removePackage(packageName);
+    }
+
+    private AccessibilityServiceInfo buildAccessibilityServiceInfo(String packageName)
+            throws IOException, XmlPullParserException {
+        return new AccessibilityServiceInfo(
+                buildResolveInfo(packageName, "A11yService"), mActivity);
+    }
+
+    private static InputMethodInfo buildInputMethodInfo(ResolveInfo resolveInfo) {
+        return new InputMethodInfo(resolveInfo, false /* isAuxIme */, "SettingsActivity",
+                null /* subtypes */,  0 /* defaultResId */, false /* forceDefault */);
+    }
+
+    private static ResolveInfo buildResolveInfo(String packageName, String className) {
+        final ResolveInfo resolveInfo = new ResolveInfo();
+        resolveInfo.serviceInfo = new ServiceInfo();
+        resolveInfo.serviceInfo.packageName = packageName;
+        resolveInfo.serviceInfo.name = className;
+        // To workaround that RobolectricPackageManager.removeResolveInfosForIntent() only works
+        // for activity/broadcast resolver.
+        resolveInfo.activityInfo = new ActivityInfo();
+        resolveInfo.activityInfo.packageName = packageName;
+        resolveInfo.activityInfo.name = className;
+
+        return resolveInfo;
+    }
+
+    private static boolean isUnderTest(Object object) {
+        return object.getClass().getName().startsWith(
+                DynamicIndexableContentMonitor.class.getName());
+    }
+}

tests/robotests/src/com/android/settings/testutils/shadow/ShadowActivityWithLoadManager.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2016 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.testutils.shadow;
+
+import android.app.Activity;
+import android.app.LoaderManager;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.shadows.ShadowActivity;
+
+/*
+ * Shadow for {@link Activity} that has LoadManager accessors.
+ */
+@Implements(Activity.class)
+public class ShadowActivityWithLoadManager extends ShadowActivity {
+
+    private LoaderManager mLoaderManager;
+
+    @Implementation
+    public LoaderManager getLoaderManager() {
+        return mLoaderManager;
+    }
+
+    // Non-Android setter.
+    public void setLoaderManager(LoaderManager loaderManager) {
+        mLoaderManager = loaderManager;
+    }
+}

tests/robotests/src/com/android/settings/testutils/shadow/ShadowContextImplWithRegisterReceiver.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016 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.testutils.shadow;
+
+import android.content.BroadcastReceiver;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.Handler;
+import android.os.UserHandle;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.shadows.ShadowContextImpl;
+
+/*
+ * Shadow for {@link ContextImpl} that has registerReceiverAsUser method.
+ */
+@Implements(className = ShadowContextImpl.CLASS_NAME)
+public class ShadowContextImplWithRegisterReceiver extends ShadowContextImpl {
+
+    @Implementation
+    public Intent registerReceiverAsUser(BroadcastReceiver receiver, UserHandle user,
+            IntentFilter filter, String broadcastPermission, Handler scheduler) {
+        return super.registerReceiver(receiver, filter, broadcastPermission, scheduler);
+    }
+}

tests/robotests/src/com/android/settings/testutils/shadow/ShadowInputManager.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2016 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.testutils.shadow;
+
+import static org.robolectric.util.ReflectionHelpers.ClassParameter.from;
+
+import android.hardware.input.IInputManager;
+import android.hardware.input.InputManager;
+import android.os.Handler;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.util.ReflectionHelpers;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/*
+ * Shadow for {@ InputManager} that has assessors for registered {@link InputDeviceListener}s.
+ */
+@Implements(value = InputManager.class, callThroughByDefault = false)
+public class ShadowInputManager {
+
+    private ArrayList<InputManager.InputDeviceListener> mInputDeviceListeners;
+
+    @Implementation
+    public void __constructor__(IInputManager service) {
+        mInputDeviceListeners = new ArrayList<>();
+    }
+
+    @Implementation
+    public static InputManager getInstance() {
+        return ReflectionHelpers.callConstructor(
+                InputManager.class,
+                from(IInputManager.class, null));
+    }
+
+    @Implementation
+    public void registerInputDeviceListener(InputManager.InputDeviceListener listener,
+            Handler handler) {
+        // TODO: Use handler.
+        if (!mInputDeviceListeners.contains(listener)) {
+            mInputDeviceListeners.add(listener);
+        }
+    }
+
+    @Implementation
+    public void unregisterInputDeviceListener(InputManager.InputDeviceListener listener) {
+        if (mInputDeviceListeners.contains(listener)) {
+            mInputDeviceListeners.remove(listener);
+        }
+    }
+
+    // Non-Android accessor.
+    public List<InputManager.InputDeviceListener> getRegisteredInputDeviceListeners() {
+        return Collections.unmodifiableList(mInputDeviceListeners);
+    }
+}

tests/robotests/src/com/android/settings/testutils/shadow/ShadowInputMethodManagerWithMethodList.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2016 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.testutils.shadow;
+
+import android.view.inputmethod.InputMethodInfo;
+import android.view.inputmethod.InputMethodManager;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.shadows.ShadowInputMethodManager;
+
+import java.util.Collections;
+import java.util.List;
+
+/*
+ * Shadow for {@link InputMethodManager} that has accessors for installed input methods.
+ */
+@Implements(InputMethodManager.class)
+public class ShadowInputMethodManagerWithMethodList extends ShadowInputMethodManager {
+
+    private List<InputMethodInfo> mInputMethodInfos = Collections.emptyList();
+
+    @Implementation
+    public static InputMethodManager getInstance() {
+        return ShadowInputMethodManager.peekInstance();
+    }
+
+    @Implementation
+    public List<InputMethodInfo> getInputMethodList() {
+        return mInputMethodInfos;
+    }
+
+    // Non-Android setter.
+    public void setInputMethodList(List<InputMethodInfo> inputMethodInfos) {
+        mInputMethodInfos = inputMethodInfos;
+    }
+}

tests/robotests/src/com/android/settings/testutils/shadow/ShadowPackageMonitor.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2016 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.testutils.shadow;
+
+import static org.robolectric.util.ReflectionHelpers.ClassParameter.from;
+
+import android.content.Context;
+import android.os.Looper;
+import android.os.UserHandle;
+
+import com.android.internal.content.PackageMonitor;
+import com.android.internal.os.BackgroundThread;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.annotation.RealObject;
+import org.robolectric.internal.Shadow;
+import org.robolectric.internal.ShadowExtractor;
+import org.robolectric.shadows.ShadowApplication;
+import org.robolectric.shadows.ShadowMessageQueue;
+
+/*
+ * Shadow for hidden {@link PackageMonitor}.
+ */
+@Implements(value = PackageMonitor.class, isInAndroidSdk = false)
+public class ShadowPackageMonitor {
+
+    @RealObject
+    private PackageMonitor mPackageMonitor;
+
+    @Implementation
+    public void register(Context context, Looper thread, UserHandle user, boolean externalStorage) {
+        // Call through to @RealObject's method.
+        Shadow.directlyOn(mPackageMonitor, PackageMonitor.class, "register",
+                from(Context.class, context), from(Looper.class, thread),
+                from(UserHandle.class, user), from(Boolean.TYPE, externalStorage));
+        // When <code>thread</code> is null, the {@link BackgroundThread} is used. Here we have to
+        // setup background Robolectric scheduler for it.
+        if (thread == null) {
+            setupBackgroundThreadScheduler();
+        }
+    }
+
+    private static void setupBackgroundThreadScheduler() {
+        ShadowMessageQueue shadowMessageQueue = ((ShadowMessageQueue) ShadowExtractor.extract(
+                BackgroundThread.getHandler().getLooper().getQueue()));
+        shadowMessageQueue.setScheduler(
+                ShadowApplication.getInstance().getBackgroundThreadScheduler());
+    }
+}