android 6.0 SystemUI源码分析(6)-StorageNotification介绍

来源：互联网发布：prim算法和迪杰斯特拉编辑：程序博客网时间：2024/06/04 18:51

StorageNotification继承于SystemUI,主要处理Storage事件，比如Storage插拔等。

在StorageNotfication的start函数，会去注册StorageEventListener。

 @Override    public void start() {        mNotificationManager = mContext.getSystemService(NotificationManager.class);        mStorageManager = mContext.getSystemService(StorageManager.class);        mStorageManager.registerListener(mListener);

对于U盘或SD卡插拔事件，我们常用的是通过广播的方式去接收，具体可以参考：

http://blog.csdn.net/zhudaozhuan/article/details/7199799

StorageEventListener的实现如下：

    private final StorageEventListener mListener = new StorageEventListener() {        @Override        public void onVolumeStateChanged(VolumeInfo vol, int oldState, int newState) {            onVolumeStateChangedInternal(vol);        }        @Override        public void onVolumeRecordChanged(VolumeRecord rec) {            // Avoid kicking notifications when getting early metadata before            // mounted. If already mounted, we're being kicked because of a            // nickname or init'ed change.            final VolumeInfo vol = mStorageManager.findVolumeByUuid(rec.getFsUuid());            if (vol != null && vol.isMountedReadable()) {                onVolumeStateChangedInternal(vol);            }        }        @Override        public void onVolumeForgotten(String fsUuid) {            // Stop annoying the user            mNotificationManager.cancelAsUser(fsUuid, PRIVATE_ID, UserHandle.ALL);        }        @Override        public void onDiskScanned(DiskInfo disk, int volumeCount) {            onDiskScannedInternal(disk, volumeCount);        }    };

StorageEventListener中还有其他的call back函数，对于外置存储设备插拔，我觉得这两个函数应该都可以拿到对应的事件：

public void onStorageStateChanged(String path, String oldState, String newState)
public void onVolumeStateChanged(VolumeInfo vol, int oldState, int newState)

在StorageNotification使用的是onVolumeStateChanged和onVolumeRecordChanged

  private void onVolumeStateChangedInternal(VolumeInfo vol) {        switch (vol.getType()) {            case VolumeInfo.TYPE_PRIVATE:                onPrivateVolumeStateChangedInternal(vol);                break;            case VolumeInfo.TYPE_PUBLIC:                onPublicVolumeStateChangedInternal(vol);                break;        }    }

TYPE_PRIVATE和TYPE_PUBLIC没有详细的解释，对于U盘TYPE_PUBLIC。

 private void onPublicVolumeStateChangedInternal(VolumeInfo vol) {        Log.d(TAG, "Notifying about public volume: " + vol.toString());        final Notification notif;        switch (vol.getState()) {            case VolumeInfo.STATE_UNMOUNTED:                notif = onVolumeUnmounted(vol);                break;            case VolumeInfo.STATE_CHECKING:                notif = onVolumeChecking(vol);                break;            case VolumeInfo.STATE_MOUNTED:            case VolumeInfo.STATE_MOUNTED_READ_ONLY:                notif = onVolumeMounted(vol);                showMMDialog();                break;            case VolumeInfo.STATE_FORMATTING:                notif = onVolumeFormatting(vol);                break;            case VolumeInfo.STATE_EJECTING:                notif = onVolumeEjecting(vol);                break;            case VolumeInfo.STATE_UNMOUNTABLE:                notif = onVolumeUnmountable(vol);                break;            case VolumeInfo.STATE_REMOVED:                notif = onVolumeRemoved(vol);                break;            case VolumeInfo.STATE_BAD_REMOVAL:                notif = onVolumeBadRemoval(vol);                break;            default:                notif = null;                break;        }

VolumeInfo记录了外置存储设备的状态，根据不同的状态，进行相应的处理。

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