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Android 8.1 设置--声音中增加通话音量

近来收到项目需求，想要在设置--声音中增加一项通话音量调节，具体修改参照如下：

/vendor/mediatek/proprietary/packages/apps/MtkSettings/res/values/strings.xml

+    <!-- Sound: Title for the option managing call volume. [CHAR LIMIT=30] -->
+    <string name="call_volume_option_title">Call volume</string>

/vendor/mediatek/proprietary/packages/apps/MtkSettings/res/values-zh-rCN/strings.xml

+    <string name="call_volume_option_title">"通话音量"</string>

/vendor/mediatek/proprietary/packages/apps/MtkSettings/res/drawable/ic_volume_voice.xml

<!--Copyright (C) 2015 The Android Open Source ProjectLicensed 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 athttp://www.apache.org/licenses/LICENSE-2.0Unless required by applicable law or agreed to in writing, softwaredistributed 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 andlimitations under the License.
-->
<vector xmlns:android="http://schemas.android.com/apk/res/android"android:height="24.0dp"android:viewportHeight="48.0"android:viewportWidth="48.0"android:width="24.0dp"android:tint="?android:attr/colorControlNormal" ><pathandroid:fillColor="#FFFFFF"android:pathData="M13.25,21.59c2.88,5.66 7.51,10.29 13.18,13.17l4.4,-4.41c0.55,-0.55 1.34,-0.71 2.03,-0.49C35.1,30.6 37.51,31.0 40.0,31.0c1.11,0.0 2.0,0.89 2.0,2.0l0.0,7.0c0.0,1.11 -0.89,2.0 -2.0,2.0C21.22,42.0 6.0,26.78 6.0,8.0c0.0,-1.1 0.9,-2.0 2.0,-2.0l7.0,0.0c1.11,0.0 2.0,0.89 2.0,2.0 0.0,2.4 0.4,4.9 1.14,7.1 0.2,0.6 0.06,1.48 -0.49,2.03l-4.4,4.42z" /></vector>

/vendor/mediatek/proprietary/packages/apps/MtkSettings/res/xml/sound_settings.xml

+        <!-- Call volume -->
+        <com.android.settings.notification.VolumeSeekBarPreference
+                android:key="call_volume"
+                android:icon="@drawable/ic_volume_voice"
+                android:title="@string/call_volume_option_title" />

/vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/notification/CallVolumePreferenceController.java

/** 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.notification;import android.content.Context;
import android.media.AudioManager;import com.android.internal.annotations.VisibleForTesting;
import com.android.settings.notification.VolumeSeekBarPreference.Callback;
import com.android.settingslib.core.lifecycle.Lifecycle;
import com.android.settings.R;public class CallVolumePreferenceController extendsVolumeSeekBarPreferenceController {private static final String KEY_CALL_VOLUME = "call_volume";private AudioHelper mHelper;public CallVolumePreferenceController(Context context, Callback callback,Lifecycle lifecycle) {this(context, callback, lifecycle, new AudioHelper(context));}@VisibleForTestingCallVolumePreferenceController(Context context, Callback callback, Lifecycle lifecycle,AudioHelper helper) {super(context, callback, lifecycle);mHelper = helper;}@Overridepublic boolean isAvailable() {return !mHelper.isSingleVolume();}@Overridepublic String getPreferenceKey() {return KEY_CALL_VOLUME;}@Overridepublic int getAudioStream() {return AudioManager.STREAM_VOICE_CALL;}@Overridepublic int getMuteIcon() {return R.drawable.ic_volume_voice;}}

/vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/notification/SoundSettings.java

    private static List<AbstractPreferenceController> buildPreferenceControllers(Context context,SoundSettings fragment, VolumeSeekBarPreference.Callback callback,Lifecycle lifecycle) {final List<AbstractPreferenceController> controllers = new ArrayList<>();controllers.add(new ZenModePreferenceController(context));controllers.add(new EmergencyBroadcastPreferenceController(context, KEY_CELL_BROADCAST_SETTINGS));controllers.add(new VibrateWhenRingPreferenceController(context));// === Volumes ===controllers.add(new AlarmVolumePreferenceController(context, callback, lifecycle));
+        controllers.add(new CallVolumePreferenceController(context, callback, lifecycle));

重新编译验证，修改生效，设置--声音中已增加通话音量调节项