Andorid去掉音量後面多餘的圖標

本文是基於Android5.1的代碼

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frameworks\base\packages\SystemUI\src\com\android\systemui\volume\VolumePanel.java

private void createSliders() {
        final Resources res = mContext.getResources();
        final LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(
                Context.LAYOUT_INFLATER_SERVICE);

        mStreamControls = new SparseArray<StreamControl>(STREAMS.length);

        final StreamResources notificationStream = StreamResources.NotificationStream;
        for (int i = 0; i < STREAMS.length; i++) {
            StreamResources streamRes = STREAMS[i];

            final int streamType = streamRes.streamType;
            final boolean isNotification = isNotificationOrRing(streamType);

            final StreamControl sc = new StreamControl();
            sc.streamType = streamType;
            sc.group = (ViewGroup) inflater.inflate(
                    com.android.systemui.R.layout.volume_panel_item, null);
            sc.group.setTag(sc);
            sc.icon = (ImageView) sc.group.findViewById(com.android.systemui.R.id.stream_icon);
            sc.icon.setTag(sc);
            sc.icon.setContentDescription(res.getString(streamRes.descRes));
            sc.iconRes = streamRes.iconRes;
            sc.iconMuteRes = streamRes.iconMuteRes;
            sc.icon.setImageResource(sc.iconRes);
            sc.icon.setClickable(isNotification && mHasVibrator);
            if (isNotification) {
                if (mHasVibrator) {
                    sc.icon.setSoundEffectsEnabled(false);
                    sc.iconMuteRes = com.android.systemui.R.drawable.ic_ringer_vibrate;
                    sc.icon.setOnClickListener(new OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            resetTimeout();
                            toggleRinger(sc);
                        }
                    });
                }
                sc.iconSuppressedRes = com.android.systemui.R.drawable.ic_ringer_mute;
            }
            sc.seekbarView = (SeekBar) sc.group.findViewById(com.android.systemui.R.id.seekbar);
            sc.suppressorView =
                    (TextView) sc.group.findViewById(com.android.systemui.R.id.suppressor);
            sc.suppressorView.setVisibility(View.GONE);
            final boolean showSecondary = false; //!isNotification && notificationStream.show;
            sc.divider = sc.group.findViewById(com.android.systemui.R.id.divider);
            sc.secondaryIcon = (ImageView) sc.group
                    .findViewById(com.android.systemui.R.id.secondary_icon);
            sc.secondaryIcon.setImageResource(com.android.systemui.R.drawable.ic_ringer_audible);
            sc.secondaryIcon.setContentDescription(res.getString(notificationStream.descRes));
            sc.secondaryIcon.setClickable(showSecondary);
            sc.divider.setVisibility(showSecondary ? View.VISIBLE : View.GONE);
            sc.secondaryIcon.setVisibility(showSecondary ? View.VISIBLE : View.GONE);
            if (showSecondary) {
                sc.secondaryIcon.setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        mSecondaryIconTransition.start(sc);
                    }
                });
            }
            final int plusOne = (streamType == AudioSystem.STREAM_BLUETOOTH_SCO ||
                    streamType == AudioSystem.STREAM_VOICE_CALL) ? 1 : 0;
            sc.seekbarView.setMax(getStreamMaxVolume(streamType) + plusOne);
            sc.seekbarView.setOnSeekBarChangeListener(mSeekListener);
            sc.seekbarView.setTag(sc);
            mStreamControls.put(streamType, sc);
        }
    }

final boolean showSecondary = false 即可，具體的代碼熟知這裏不再做過多廢話！