Add developer menu entry to enable Bluetooth AVDTP delay reports

Bug: 32755225
Test: Manual test with a device that supports delay reporting;
Robolectric tests
Change-Id: I8f121dd7f94bce3a07deb9cb23c698829cbecd96

src/com/android/settings/development/BluetoothDelayReportsPreferenceController.java

@@ -0,0 +1,85 @@
+/*
+ * 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.development;
+
+import android.content.Context;
+import android.os.SystemProperties;
+import android.support.annotation.VisibleForTesting;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+public class BluetoothDelayReportsPreferenceController extends
+        DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener,
+        PreferenceControllerMixin {
+
+    private static final String BLUETOOTH_ENABLE_AVDTP_DELAY_REPORT_KEY =
+            "bluetooth_enable_avdtp_delay_reports";
+    @VisibleForTesting
+    static final String BLUETOOTH_ENABLE_AVDTP_DELAY_REPORTS_PROPERTY =
+            "persist.bluetooth.enabledelayreports";
+
+    private SwitchPreference mPreference;
+
+    public BluetoothDelayReportsPreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return BLUETOOTH_ENABLE_AVDTP_DELAY_REPORT_KEY;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        mPreference = (SwitchPreference) screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean isEnabled = (Boolean) newValue;
+        SystemProperties.set(BLUETOOTH_ENABLE_AVDTP_DELAY_REPORTS_PROPERTY,
+                isEnabled ? "true" : "false");
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final boolean isEnabled = SystemProperties.getBoolean(
+                BLUETOOTH_ENABLE_AVDTP_DELAY_REPORTS_PROPERTY, false /* default */);
+        mPreference.setChecked(isEnabled);
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchEnabled() {
+        mPreference.setEnabled(true);
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        mPreference.setEnabled(false);
+        // the default setting for this preference is the disabled state
+        mPreference.setChecked(false);
+        SystemProperties.set(BLUETOOTH_ENABLE_AVDTP_DELAY_REPORTS_PROPERTY, "false");
+    }
+
+}

src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java

@@ -404,6 +404,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new BluetoothDeviceNoNamePreferenceController(context));
         controllers.add(new BluetoothAbsoluteVolumePreferenceController(context));
         controllers.add(new BluetoothInbandRingingPreferenceController(context));
+        controllers.add(new BluetoothDelayReportsPreferenceController(context));
         controllers.add(new BluetoothAvrcpVersionPreferenceController(context));
         controllers.add(new BluetoothAudioCodecPreferenceController(context, lifecycle,
                 bluetoothA2dpConfigStore));