[R0] 播放T卡视频，拔卡，状态栏图标不消失 - 《AOSP开发手记》

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移除正在使用中的存储设备，在任何操作系统上都是非法操作，都会引发一定程度的故障，甚至系统宕机（极端情况下会引发SWT）。而存储设备轻则文件被损坏，重则硬件烧坏，这是无法彻底解决的，只能在人为习惯上尽量避免。

本题即为播放T卡中的视频时，突然被拔出，导致ExternalStorageService的IO操作被挂起，StorageService检测到挂起状态后对其进行重启。
ExternalStorageService 重启之后重新尝试卸载T卡，而此时T卡实际已经不在了，故卸载失败；因而SystemUI收不到卸载完成的通知，故图标不消失。

针对此现象的修改方法如下：

1、
修改 vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/usb/StorageNotification.java

private NotificationManager mNotificationManager;
private StorageManager mStorageManager;
/// START. 弹SD卡后图标不消失. By XShawn@20210203.
private static final String ACTION_RESET_STORAGE_SERVICE = "emdoor.intent.action.RESET_STORAGE_SERVICE";
private VolumeInfo lastPublicVolume = null;
private final BroadcastReceiver mServiceResetReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String sessionId = intent.getStringExtra("SESSION_ID");
        String volId = lastPublicVolume.getId();
        if (null == lastPublicVolume || !volId.equals(sessionId)) {
            return;
        }
        mNotificationManager.cancelAsUser(volId, SystemMessage.NOTE_STORAGE_PUBLIC,
                UserHandle.of(lastPublicVolume.getMountUserId()));
        lastPublicVolume = null;
    }
};
/// END. 弹SD卡后图标不消失. By XShawn@20210203.
public StorageNotification(Context context) {
    super(context);
}

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@Override
public void start() {
    mNotificationManager = mContext.getSystemService(NotificationManager.class);
    mStorageManager = mContext.getSystemService(StorageManager.class);
    mStorageManager.registerListener(mListener);
    mContext.registerReceiver(mSnoozeReceiver, new IntentFilter(ACTION_SNOOZE_VOLUME),
                              android.Manifest.permission.MOUNT_UNMOUNT_FILESYSTEMS, null);
    mContext.registerReceiver(mFinishReceiver, new IntentFilter(ACTION_FINISH_WIZARD),
                              android.Manifest.permission.MOUNT_UNMOUNT_FILESYSTEMS, null);
    /// START. 弹SD卡后图标不消失. By XShawn@20210203.
    mContext.registerReceiver(
        mServiceResetReceiver,
        new IntentFilter(ACTION_RESET_STORAGE_SERVICE)
    );
    /// END. 弹SD卡后图标不消失. By XShawn@20210203.
    // Kick current state into place
    final List<DiskInfo> disks = mStorageManager.getDisks();
    for (DiskInfo disk : disks) {
        onDiskScannedInternal(disk, disk.volumeCount);
    }
    final List<VolumeInfo> vols = mStorageManager.getVolumes();
    for (VolumeInfo vol : vols) {
        onVolumeStateChangedInternal(vol);
    }
    mContext.getPackageManager().registerMoveCallback(mMoveCallback, new Handler());
    updateMissingPrivateVolumes();
}