Add flag to disable part of event_logging in Settings.

- Fork SettingsEventLogWriter from EventLogWritter. This is identical to
the base class except it overrides some logging method with a flag
check.  We can't entirely disable event_log logging because some of the stuff
being logged will not exist in stats_log, for example paired metadata.

Bug: 129697155
Test: robotest
Change-Id: I9cd46bbb54cb85737bbf7760e315c1fe34f77498

tests/robotests/src/com/android/settings/core/instrumentation/SettingsEventLogWriterTest.java

@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2019 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.core.instrumentation;
+
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.app.settings.SettingsEnums;
+import android.content.Context;
+import android.metrics.LogMaker;
+import android.provider.DeviceConfig;
+
+import com.android.internal.logging.MetricsLogger;
+import com.android.settings.core.SettingsUIDeviceConfig;
+import com.android.settings.testutils.shadow.ShadowDeviceConfig;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.annotation.Resetter;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(shadows = {ShadowDeviceConfig.class, SettingsEventLogWriterTest.ShadowMetricsLogger.class})
+public class SettingsEventLogWriterTest {
+
+    private SettingsEventLogWriter mWriter;
+
+    @Before
+    public void setUp() {
+        mWriter = new SettingsEventLogWriter();
+    }
+
+    @After
+    public void tearDown() {
+        ShadowDeviceConfig.reset();
+        ShadowMetricsLogger.reset();
+    }
+
+    @Test
+    public void visible_eventLogEnabled_shouldLog() {
+        DeviceConfig.setProperty(DeviceConfig.NAMESPACE_SETTINGS_UI,
+                SettingsUIDeviceConfig.GENERIC_EVENT_LOGGING_ENABLED, "true", true);
+
+        mWriter.visible(RuntimeEnvironment.application, SettingsEnums.PAGE_UNKNOWN,
+                SettingsEnums.SETTINGS_HOMEPAGE);
+
+        assertThat(ShadowMetricsLogger.sActionLoggedCount).isEqualTo(1);
+    }
+
+    @Test
+    public void hidden_eventLogEnabled_shouldLog() {
+        DeviceConfig.setProperty(DeviceConfig.NAMESPACE_SETTINGS_UI,
+                SettingsUIDeviceConfig.GENERIC_EVENT_LOGGING_ENABLED, "true", true);
+
+        mWriter.hidden(RuntimeEnvironment.application, SettingsEnums.SETTINGS_HOMEPAGE);
+
+        assertThat(ShadowMetricsLogger.sActionLoggedCount).isEqualTo(1);
+    }
+
+    @Test
+    public void visible_eventLogDisabled_shouldNotLog() {
+        DeviceConfig.setProperty(DeviceConfig.NAMESPACE_SETTINGS_UI,
+                SettingsUIDeviceConfig.GENERIC_EVENT_LOGGING_ENABLED, "false", true);
+
+        mWriter.visible(RuntimeEnvironment.application, SettingsEnums.PAGE_UNKNOWN,
+                SettingsEnums.SETTINGS_HOMEPAGE);
+
+        assertThat(ShadowMetricsLogger.sActionLoggedCount).isEqualTo(0);
+    }
+
+    @Test
+    public void hidden_eventLogDisabled_shouldNotLog() {
+        DeviceConfig.setProperty(DeviceConfig.NAMESPACE_SETTINGS_UI,
+                SettingsUIDeviceConfig.GENERIC_EVENT_LOGGING_ENABLED, "false", true);
+
+        mWriter.hidden(RuntimeEnvironment.application, SettingsEnums.SETTINGS_HOMEPAGE);
+
+        assertThat(ShadowMetricsLogger.sActionLoggedCount).isEqualTo(0);
+    }
+
+    @Implements(MetricsLogger.class)
+    public static class ShadowMetricsLogger {
+
+        public static int sActionLoggedCount = 0;
+
+        @Resetter
+        public static void reset() {
+            sActionLoggedCount = 0;
+        }
+
+        @Implementation
+        protected static void action(LogMaker content) {
+            sActionLoggedCount++;
+        }
+
+        @Implementation
+        public static void hidden(Context context, int category) throws IllegalArgumentException {
+            sActionLoggedCount++;
+        }
+    }
+
+}