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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.systemui.volume;
     18 
     19 import android.animation.Animator;
     20 import android.animation.AnimatorInflater;
     21 import android.animation.AnimatorSet;
     22 import android.annotation.DrawableRes;
     23 import android.annotation.Nullable;
     24 import android.app.Dialog;
     25 import android.app.KeyguardManager;
     26 import android.car.Car;
     27 import android.car.CarNotConnectedException;
     28 import android.car.media.CarAudioManager;
     29 import android.car.media.ICarVolumeCallback;
     30 import android.content.ComponentName;
     31 import android.content.Context;
     32 import android.content.DialogInterface;
     33 import android.content.ServiceConnection;
     34 import android.content.res.TypedArray;
     35 import android.content.res.XmlResourceParser;
     36 import android.graphics.Color;
     37 import android.graphics.drawable.ColorDrawable;
     38 import android.graphics.PixelFormat;
     39 import android.graphics.drawable.Drawable;
     40 import android.media.AudioAttributes;
     41 import android.media.AudioManager;
     42 import android.os.Debug;
     43 import android.os.Handler;
     44 import android.os.IBinder;
     45 import android.os.Looper;
     46 import android.os.Message;
     47 import android.util.AttributeSet;
     48 import android.util.Log;
     49 import android.util.SparseArray;
     50 import android.util.Xml;
     51 import android.view.ContextThemeWrapper;
     52 import android.view.Gravity;
     53 import android.view.MotionEvent;
     54 import android.view.View;
     55 import android.view.ViewGroup;
     56 import android.view.Window;
     57 import android.view.WindowManager;
     58 import android.widget.SeekBar;
     59 import android.widget.SeekBar.OnSeekBarChangeListener;
     60 
     61 import androidx.car.widget.ListItem;
     62 import androidx.car.widget.ListItemAdapter;
     63 import androidx.car.widget.ListItemAdapter.BackgroundStyle;
     64 import androidx.car.widget.ListItemProvider.ListProvider;
     65 import androidx.car.widget.PagedListView;
     66 import androidx.car.widget.SeekbarListItem;
     67 
     68 import java.util.Iterator;
     69 import org.xmlpull.v1.XmlPullParserException;
     70 
     71 import java.io.IOException;
     72 import java.io.PrintWriter;
     73 import java.util.ArrayList;
     74 import java.util.List;
     75 
     76 import com.android.systemui.R;
     77 import com.android.systemui.plugins.VolumeDialog;
     78 
     79 /**
     80  * Car version of the volume dialog.
     81  *
     82  * Methods ending in "H" must be called on the (ui) handler.
     83  */
     84 public class CarVolumeDialogImpl implements VolumeDialog {
     85   private static final String TAG = Util.logTag(CarVolumeDialogImpl.class);
     86 
     87   private static final String XML_TAG_VOLUME_ITEMS = "carVolumeItems";
     88   private static final String XML_TAG_VOLUME_ITEM = "item";
     89   private static final int HOVERING_TIMEOUT = 16000;
     90   private static final int NORMAL_TIMEOUT = 3000;
     91   private static final int LISTVIEW_ANIMATION_DURATION_IN_MILLIS = 250;
     92   private static final int DISMISS_DELAY_IN_MILLIS = 50;
     93   private static final int ARROW_FADE_IN_START_DELAY_IN_MILLIS = 100;
     94 
     95   private final Context mContext;
     96   private final H mHandler = new H();
     97 
     98   private Window mWindow;
     99   private CustomDialog mDialog;
    100   private PagedListView mListView;
    101   private ListItemAdapter mPagedListAdapter;
    102   // All the volume items.
    103   private final SparseArray<VolumeItem> mVolumeItems = new SparseArray<>();
    104   // Available volume items in car audio manager.
    105   private final List<VolumeItem> mAvailableVolumeItems = new ArrayList<>();
    106   // Volume items in the PagedListView.
    107   private final List<ListItem> mVolumeLineItems = new ArrayList<>();
    108   private final KeyguardManager mKeyguard;
    109 
    110   private Car mCar;
    111   private CarAudioManager mCarAudioManager;
    112 
    113   private boolean mHovering;
    114   private boolean mShowing;
    115   private boolean mExpanded;
    116 
    117   public CarVolumeDialogImpl(Context context) {
    118     mContext = new ContextThemeWrapper(context, com.android.systemui.R.style.qs_theme);
    119     mKeyguard = (KeyguardManager) mContext.getSystemService(Context.KEYGUARD_SERVICE);
    120     mCar = Car.createCar(mContext, mServiceConnection);
    121   }
    122 
    123   public void init(int windowType, Callback callback) {
    124     initDialog();
    125 
    126     mCar.connect();
    127   }
    128 
    129   @Override
    130   public void destroy() {
    131     mHandler.removeCallbacksAndMessages(null);
    132 
    133     cleanupAudioManager();
    134     // unregisterVolumeCallback is not being called when disconnect car, so we manually cleanup
    135     // audio manager beforehand.
    136     mCar.disconnect();
    137   }
    138 
    139   private void initDialog() {
    140     loadAudioUsageItems();
    141     mVolumeLineItems.clear();
    142     mDialog = new CustomDialog(mContext);
    143 
    144     mHovering = false;
    145     mShowing = false;
    146     mExpanded = false;
    147     mWindow = mDialog.getWindow();
    148     mWindow.requestFeature(Window.FEATURE_NO_TITLE);
    149     mWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
    150     mWindow.clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND
    151         | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
    152     mWindow.addFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
    153         | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
    154         | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
    155         | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
    156         | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
    157         | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);
    158     mWindow.setType(WindowManager.LayoutParams.TYPE_VOLUME_OVERLAY);
    159     mWindow.setWindowAnimations(com.android.internal.R.style.Animation_Toast);
    160     final WindowManager.LayoutParams lp = mWindow.getAttributes();
    161     lp.format = PixelFormat.TRANSLUCENT;
    162     lp.setTitle(VolumeDialogImpl.class.getSimpleName());
    163     lp.gravity = Gravity.TOP | Gravity.CENTER_HORIZONTAL;
    164     lp.windowAnimations = -1;
    165     mWindow.setAttributes(lp);
    166     mWindow.setLayout(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    167 
    168     mDialog.setCanceledOnTouchOutside(true);
    169     mDialog.setContentView(R.layout.car_volume_dialog);
    170     mDialog.setOnShowListener(dialog -> {
    171       mListView.setTranslationY(-mListView.getHeight());
    172       mListView.setAlpha(0);
    173       mListView.animate()
    174           .alpha(1)
    175           .translationY(0)
    176           .setDuration(LISTVIEW_ANIMATION_DURATION_IN_MILLIS)
    177           .setInterpolator(new SystemUIInterpolators.LogDecelerateInterpolator())
    178           .start();
    179     });
    180     mListView = (PagedListView) mWindow.findViewById(R.id.volume_list);
    181     mListView.setOnHoverListener((v, event) -> {
    182       int action = event.getActionMasked();
    183       mHovering = (action == MotionEvent.ACTION_HOVER_ENTER)
    184           || (action == MotionEvent.ACTION_HOVER_MOVE);
    185       rescheduleTimeoutH();
    186       return true;
    187     });
    188 
    189     mPagedListAdapter = new ListItemAdapter(mContext, new ListProvider(mVolumeLineItems),
    190         BackgroundStyle.PANEL);
    191     mListView.setAdapter(mPagedListAdapter);
    192     mListView.setMaxPages(PagedListView.UNLIMITED_PAGES);
    193   }
    194 
    195   public void show(int reason) {
    196     mHandler.obtainMessage(H.SHOW, reason, 0).sendToTarget();
    197   }
    198 
    199   public void dismiss(int reason) {
    200     mHandler.obtainMessage(H.DISMISS, reason, 0).sendToTarget();
    201   }
    202 
    203   private void showH(int reason) {
    204     if (D.BUG) {
    205       Log.d(TAG, "showH r=" + Events.DISMISS_REASONS[reason]);
    206     }
    207 
    208     mHandler.removeMessages(H.SHOW);
    209     mHandler.removeMessages(H.DISMISS);
    210     rescheduleTimeoutH();
    211     // Refresh the data set before showing.
    212     mPagedListAdapter.notifyDataSetChanged();
    213     if (mShowing) {
    214       return;
    215     }
    216     mShowing = true;
    217 
    218     mDialog.show();
    219     Events.writeEvent(mContext, Events.EVENT_SHOW_DIALOG, reason, mKeyguard.isKeyguardLocked());
    220   }
    221 
    222   protected void rescheduleTimeoutH() {
    223     mHandler.removeMessages(H.DISMISS);
    224     final int timeout = computeTimeoutH();
    225     mHandler.sendMessageDelayed(mHandler
    226         .obtainMessage(H.DISMISS, Events.DISMISS_REASON_TIMEOUT, 0), timeout);
    227 
    228     if (D.BUG) {
    229       Log.d(TAG, "rescheduleTimeout " + timeout + " " + Debug.getCaller());
    230     }
    231   }
    232 
    233   private int computeTimeoutH() {
    234     return mHovering ? HOVERING_TIMEOUT : NORMAL_TIMEOUT;
    235   }
    236 
    237   protected void dismissH(int reason) {
    238     if (D.BUG) {
    239       Log.d(TAG, "dismissH r=" + Events.DISMISS_REASONS[reason]);
    240     }
    241 
    242     mHandler.removeMessages(H.DISMISS);
    243     mHandler.removeMessages(H.SHOW);
    244     if (!mShowing) {
    245       return;
    246     }
    247 
    248     mListView.animate().cancel();
    249     mShowing = false;
    250 
    251     mListView.setTranslationY(0);
    252     mListView.setAlpha(1);
    253     mListView.animate()
    254         .alpha(0)
    255         .translationY(-mListView.getHeight())
    256         .setDuration(LISTVIEW_ANIMATION_DURATION_IN_MILLIS)
    257         .setInterpolator(new SystemUIInterpolators.LogAccelerateInterpolator())
    258         .withEndAction(() -> mHandler.postDelayed(() -> {
    259           if (D.BUG) {
    260             Log.d(TAG, "mDialog.dismiss()");
    261           }
    262           mDialog.dismiss();
    263         }, DISMISS_DELAY_IN_MILLIS))
    264         .start();
    265 
    266     Events.writeEvent(mContext, Events.EVENT_DISMISS_DIALOG, reason);
    267   }
    268 
    269   public void dump(PrintWriter writer) {
    270     writer.println(VolumeDialogImpl.class.getSimpleName() + " state:");
    271     writer.print("  mShowing: "); writer.println(mShowing);
    272   }
    273 
    274   private void loadAudioUsageItems() {
    275     try (XmlResourceParser parser = mContext.getResources().getXml(R.xml.car_volume_items)) {
    276       AttributeSet attrs = Xml.asAttributeSet(parser);
    277       int type;
    278       // Traverse to the first start tag
    279       while ((type=parser.next()) != XmlResourceParser.END_DOCUMENT
    280           && type != XmlResourceParser.START_TAG) {
    281       }
    282 
    283       if (!XML_TAG_VOLUME_ITEMS.equals(parser.getName())) {
    284         throw new RuntimeException("Meta-data does not start with carVolumeItems tag");
    285       }
    286       int outerDepth = parser.getDepth();
    287       int rank = 0;
    288       while ((type=parser.next()) != XmlResourceParser.END_DOCUMENT
    289           && (type != XmlResourceParser.END_TAG || parser.getDepth() > outerDepth)) {
    290         if (type == XmlResourceParser.END_TAG) {
    291           continue;
    292         }
    293         if (XML_TAG_VOLUME_ITEM.equals(parser.getName())) {
    294           TypedArray item = mContext.getResources().obtainAttributes(
    295               attrs, R.styleable.carVolumeItems_item);
    296           int usage = item.getInt(R.styleable.carVolumeItems_item_usage, -1);
    297           if (usage >= 0) {
    298             VolumeItem volumeItem = new VolumeItem();
    299             volumeItem.usage = usage;
    300             volumeItem.rank = rank;
    301             volumeItem.icon = item.getResourceId(R.styleable.carVolumeItems_item_icon, 0);
    302             mVolumeItems.put(usage, volumeItem);
    303             rank++;
    304           }
    305           item.recycle();
    306         }
    307       }
    308     } catch (XmlPullParserException | IOException e) {
    309       Log.e(TAG, "Error parsing volume groups configuration", e);
    310     }
    311   }
    312 
    313   private VolumeItem getVolumeItemForUsages(int[] usages) {
    314     int rank = Integer.MAX_VALUE;
    315     VolumeItem result = null;
    316     for (int usage : usages) {
    317       VolumeItem volumeItem = mVolumeItems.get(usage);
    318       if (volumeItem.rank < rank) {
    319         rank = volumeItem.rank;
    320         result = volumeItem;
    321       }
    322     }
    323     return result;
    324   }
    325 
    326   private static int getSeekbarValue(CarAudioManager carAudioManager, int volumeGroupId) {
    327     try {
    328       return carAudioManager.getGroupVolume(volumeGroupId);
    329     } catch (CarNotConnectedException e) {
    330       Log.e(TAG, "Car is not connected!", e);
    331     }
    332     return 0;
    333   }
    334 
    335   private static int getMaxSeekbarValue(CarAudioManager carAudioManager, int volumeGroupId) {
    336     try {
    337       return carAudioManager.getGroupMaxVolume(volumeGroupId);
    338     } catch (CarNotConnectedException e) {
    339       Log.e(TAG, "Car is not connected!", e);
    340     }
    341     return 0;
    342   }
    343 
    344   private SeekbarListItem addSeekbarListItem(VolumeItem volumeItem, int volumeGroupId,
    345       int supplementalIconId, @Nullable View.OnClickListener supplementalIconOnClickListener) {
    346     SeekbarListItem listItem = new SeekbarListItem(mContext);
    347     listItem.setMax(getMaxSeekbarValue(mCarAudioManager, volumeGroupId));
    348     int color = mContext.getResources().getColor(R.color.car_volume_dialog_tint);
    349     int progress = getSeekbarValue(mCarAudioManager, volumeGroupId);
    350     listItem.setProgress(progress);
    351     listItem.setOnSeekBarChangeListener(
    352         new CarVolumeDialogImpl.VolumeSeekBarChangeListener(volumeGroupId, mCarAudioManager));
    353     Drawable primaryIcon = mContext.getResources().getDrawable(volumeItem.icon);
    354     primaryIcon.setTint(color);
    355     listItem.setPrimaryActionIcon(primaryIcon);
    356     if (supplementalIconId != 0) {
    357       Drawable supplementalIcon = mContext.getResources().getDrawable(supplementalIconId);
    358       supplementalIcon.setTint(color);
    359       listItem.setSupplementalIcon(supplementalIcon, true,
    360           supplementalIconOnClickListener);
    361     } else {
    362       listItem.setSupplementalEmptyIcon(true);
    363     }
    364 
    365     mVolumeLineItems.add(listItem);
    366     volumeItem.listItem = listItem;
    367     volumeItem.progress = progress;
    368     return listItem;
    369   }
    370 
    371   private VolumeItem findVolumeItem(SeekbarListItem targetItem) {
    372     for (int i = 0; i < mVolumeItems.size(); ++i) {
    373       VolumeItem volumeItem = mVolumeItems.valueAt(i);
    374       if (volumeItem.listItem == targetItem) {
    375         return volumeItem;
    376       }
    377     }
    378     return null;
    379   }
    380 
    381   private void cleanupAudioManager() {
    382     try {
    383       mCarAudioManager.unregisterVolumeCallback(mVolumeChangeCallback.asBinder());
    384     } catch (CarNotConnectedException e) {
    385       Log.e(TAG, "Car is not connected!", e);
    386     }
    387     mVolumeLineItems.clear();
    388     mCarAudioManager = null;
    389   }
    390 
    391   private final class H extends Handler {
    392     private static final int SHOW = 1;
    393     private static final int DISMISS = 2;
    394 
    395     public H() {
    396       super(Looper.getMainLooper());
    397     }
    398 
    399     @Override
    400     public void handleMessage(Message msg) {
    401       switch (msg.what) {
    402         case SHOW:
    403           showH(msg.arg1);
    404           break;
    405         case DISMISS:
    406           dismissH(msg.arg1);
    407           break;
    408         default:
    409       }
    410     }
    411   }
    412 
    413   private final class CustomDialog extends Dialog implements DialogInterface {
    414     public CustomDialog(Context context) {
    415       super(context, com.android.systemui.R.style.qs_theme);
    416     }
    417 
    418     @Override
    419     public boolean dispatchTouchEvent(MotionEvent ev) {
    420       rescheduleTimeoutH();
    421       return super.dispatchTouchEvent(ev);
    422     }
    423 
    424     @Override
    425     protected void onStart() {
    426       super.setCanceledOnTouchOutside(true);
    427       super.onStart();
    428     }
    429 
    430     @Override
    431     protected void onStop() {
    432       super.onStop();
    433     }
    434 
    435     @Override
    436     public boolean onTouchEvent(MotionEvent event) {
    437       if (isShowing()) {
    438         if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
    439           dismissH(Events.DISMISS_REASON_TOUCH_OUTSIDE);
    440           return true;
    441         }
    442       }
    443       return false;
    444     }
    445   }
    446 
    447   private final class ExpandIconListener implements View.OnClickListener {
    448     @Override
    449     public void onClick(final View v) {
    450       mExpanded = !mExpanded;
    451       Animator inAnimator;
    452       if (mExpanded) {
    453         for (int groupId = 0; groupId < mAvailableVolumeItems.size(); ++groupId) {
    454           // Adding the items which are not coming from the default item.
    455           VolumeItem volumeItem = mAvailableVolumeItems.get(groupId);
    456           if (volumeItem.defaultItem) {
    457             // Set progress here due to the progress of seekbar may not be updated.
    458             volumeItem.listItem.setProgress(volumeItem.progress);
    459           } else {
    460             addSeekbarListItem(volumeItem, groupId, 0, null);
    461           }
    462         }
    463         inAnimator = AnimatorInflater.loadAnimator(
    464             mContext, R.anim.car_arrow_fade_in_rotate_up);
    465       } else {
    466         // Only keeping the default stream if it is not expended.
    467         Iterator itr = mVolumeLineItems.iterator();
    468         while (itr.hasNext()) {
    469           SeekbarListItem seekbarListItem = (SeekbarListItem) itr.next();
    470           VolumeItem volumeItem = findVolumeItem(seekbarListItem);
    471           if (!volumeItem.defaultItem) {
    472             itr.remove();
    473           } else {
    474             // Set progress here due to the progress of seekbar may not be updated.
    475             seekbarListItem.setProgress(volumeItem.progress);
    476           }
    477         }
    478         inAnimator = AnimatorInflater.loadAnimator(
    479             mContext, R.anim.car_arrow_fade_in_rotate_down);
    480       }
    481 
    482       Animator outAnimator = AnimatorInflater.loadAnimator(
    483           mContext, R.anim.car_arrow_fade_out);
    484       inAnimator.setStartDelay(ARROW_FADE_IN_START_DELAY_IN_MILLIS);
    485       AnimatorSet animators = new AnimatorSet();
    486       animators.playTogether(outAnimator, inAnimator);
    487       animators.setTarget(v);
    488       animators.start();
    489       mPagedListAdapter.notifyDataSetChanged();
    490     }
    491   }
    492 
    493   private final class VolumeSeekBarChangeListener implements OnSeekBarChangeListener {
    494     private final int mVolumeGroupId;
    495     private final CarAudioManager mCarAudioManager;
    496 
    497     private VolumeSeekBarChangeListener(int volumeGroupId, CarAudioManager carAudioManager) {
    498       mVolumeGroupId = volumeGroupId;
    499       mCarAudioManager = carAudioManager;
    500     }
    501 
    502     @Override
    503     public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
    504       if (!fromUser) {
    505         // For instance, if this event is originated from AudioService,
    506         // we can ignore it as it has already been handled and doesn't need to be
    507         // sent back down again.
    508         return;
    509       }
    510       try {
    511         if (mCarAudioManager == null) {
    512           Log.w(TAG, "Ignoring volume change event because the car isn't connected");
    513           return;
    514         }
    515         mAvailableVolumeItems.get(mVolumeGroupId).progress = progress;
    516         mCarAudioManager.setGroupVolume(mVolumeGroupId, progress, 0);
    517       } catch (CarNotConnectedException e) {
    518         Log.e(TAG, "Car is not connected!", e);
    519       }
    520     }
    521 
    522     @Override
    523     public void onStartTrackingTouch(SeekBar seekBar) {}
    524 
    525     @Override
    526     public void onStopTrackingTouch(SeekBar seekBar) {}
    527   }
    528 
    529   private final ICarVolumeCallback mVolumeChangeCallback = new ICarVolumeCallback.Stub() {
    530     @Override
    531     public void onGroupVolumeChanged(int groupId, int flags) {
    532       VolumeItem volumeItem = mAvailableVolumeItems.get(groupId);
    533       int value = getSeekbarValue(mCarAudioManager, groupId);
    534       // Do not update the progress if it is the same as before. When car audio manager sets its
    535       // group volume caused by the seekbar progress changed, it also triggers this callback.
    536       // Updating the seekbar at the same time could block the continuous seeking.
    537       if (value != volumeItem.progress) {
    538         volumeItem.listItem.setProgress(value);
    539         volumeItem.progress = value;
    540         if ((flags & AudioManager.FLAG_SHOW_UI) != 0) {
    541           show(Events.SHOW_REASON_VOLUME_CHANGED);
    542         }
    543       }
    544     }
    545 
    546     @Override
    547     public void onMasterMuteChanged(int flags) {
    548       // ignored
    549     }
    550   };
    551 
    552   private final ServiceConnection mServiceConnection = new ServiceConnection() {
    553     @Override
    554     public void onServiceConnected(ComponentName name, IBinder service) {
    555       try {
    556         mExpanded = false;
    557         mCarAudioManager = (CarAudioManager) mCar.getCarManager(Car.AUDIO_SERVICE);
    558         int volumeGroupCount = mCarAudioManager.getVolumeGroupCount();
    559         // Populates volume slider items from volume groups to UI.
    560         for (int groupId = 0; groupId < volumeGroupCount; groupId++) {
    561           VolumeItem volumeItem = getVolumeItemForUsages(
    562               mCarAudioManager.getUsagesForVolumeGroupId(groupId));
    563           mAvailableVolumeItems.add(volumeItem);
    564           // The first one is the default item.
    565           if (groupId == 0) {
    566             volumeItem.defaultItem = true;
    567             addSeekbarListItem(volumeItem, groupId, R.drawable.car_ic_keyboard_arrow_down,
    568                 new ExpandIconListener());
    569           }
    570         }
    571 
    572         // If list is already initiated, update its content.
    573         if (mPagedListAdapter != null) {
    574           mPagedListAdapter.notifyDataSetChanged();
    575         }
    576         mCarAudioManager.registerVolumeCallback(mVolumeChangeCallback.asBinder());
    577       } catch (CarNotConnectedException e) {
    578         Log.e(TAG, "Car is not connected!", e);
    579       }
    580     }
    581 
    582     /**
    583      * This does not get called when service is properly disconnected.
    584      * So we need to also handle cleanups in destroy().
    585      */
    586     @Override
    587     public void onServiceDisconnected(ComponentName name) {
    588       cleanupAudioManager();
    589     }
    590   };
    591 
    592   /**
    593    * Wrapper class which contains information of each volume group.
    594    */
    595   private static class VolumeItem {
    596     private @AudioAttributes.AttributeUsage int usage;
    597     private int rank;
    598     private boolean defaultItem = false;
    599     private @DrawableRes int icon;
    600     private SeekbarListItem listItem;
    601     private int progress;
    602   }
    603 }
    604