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最新推荐文章于 2022-10-19 11:06:04 发布

转载最新推荐文章于 2022-10-19 11:06:04 发布 · 679 阅读

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本文介绍了一个文件管理应用中用于更新存储卷信息的方法。通过遍历获取到的所有存储设备，并检查其挂载状态来决定是否将其加入到管理列表中。对于不同的存储类型（如内部存储、外部带有UUID的存储等），赋予了不同的标识符和展示名称。

Get from ：
https://github.com/1hakr/AnExplorer/blob/master/app/src/main/java/dev/dworks/apps/anexplorer/provider/ExternalStorageProvider.java

private void updateVolumesLocked() {
    mRoots.clear();

    int count = 0;
    StorageUtils storageUtils = new StorageUtils(getContext());
    for (StorageVolume storageVolume : storageUtils.getStorageMounts()) {
        final File path = storageVolume.getPathFile();
        String state = EnvironmentCompat.getStorageState(path);
        final boolean mounted = Environment.MEDIA_MOUNTED.equals(state)
                || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state);
        if (!mounted) continue;

        final String rootId;
        final String title;
        if (storageVolume.isPrimary()) {
            rootId = ROOT_ID_PRIMARY_EMULATED;
            title = getContext().getString(R.string.root_internal_storage);
        } else if (storageVolume.getUuid() != null) {
            rootId = ROOT_ID_SECONDARY + storageVolume.getUuid();
            String label = storageVolume.getUserLabel();
            title = !TextUtils.isEmpty(label) ? label
                    : getContext().getString(R.string.root_external_storage)
                    + (count > 0 ? " " + count : "");
            count++;
        } else {
            Log.d(TAG, "Missing UUID for " + storageVolume.getPath() + "; skipping");
            continue;
        }

        if (mRoots.containsKey(rootId)) {
            Log.w(TAG, "Duplicate UUID " + rootId + "; skipping");
            continue;
        }

        try {
           if(null == path.listFiles()){
              continue;
           }
            final RootInfo root = new RootInfo();
            mRoots.put(rootId, root);

            root.rootId = rootId;
            root.flags = Root.FLAG_SUPPORTS_CREATE | Root.FLAG_SUPPORTS_EDIT | Root.FLAG_LOCAL_ONLY | Root.FLAG_ADVANCED
                    | Root.FLAG_SUPPORTS_SEARCH | Root.FLAG_SUPPORTS_IS_CHILD;
            root.title = title;
            root.path = path;
            root.docId = getDocIdForFile(path);
        } catch (FileNotFoundException e) {
            throw new IllegalStateException(e);
        }
    }
}
private void updateVolumesLocked() {    mRoots.clear();    int count = 0;    StorageUtils storageUtils = new StorageUtils(getContext());    for (StorageVolume storageVolume : storageUtils.getStorageMounts()) {        final File path = storageVolume.getPathFile();        String state = EnvironmentCompat.getStorageState(path);        final boolean mounted = Environment.MEDIA_MOUNTED.equals(state)                || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state);        if (!mounted) continue;        final String rootId;        final String title;        if (storageVolume.isPrimary()) {            rootId = ROOT_ID_PRIMARY_EMULATED;            title = getContext().getString(R.string.root_internal_storage);        } else if (storageVolume.getUuid() != null) {            rootId = ROOT_ID_SECONDARY + storageVolume.getUuid();            String label = storageVolume.getUserLabel();            title = !TextUtils.isEmpty(label) ? label                    : getContext().getString(R.string.root_external_storage)                    + (count > 0 ? " " + count : "");            count++;        } else {            Log.d(TAG, "Missing UUID for " + storageVolume.getPath() + "; skipping");            continue;        }        if (mRoots.containsKey(rootId)) {            Log.w(TAG, "Duplicate UUID " + rootId + "; skipping");            continue;        }        try {           if(null == path.listFiles()){              continue;           }            final RootInfo root = new RootInfo();            mRoots.put(rootId, root);            root.rootId = rootId;            root.flags = Root.FLAG_SUPPORTS_CREATE | Root.FLAG_SUPPORTS_EDIT | Root.FLAG_LOCAL_ONLY | Root.FLAG_ADVANCED                    | Root.FLAG_SUPPORTS_SEARCH | Root.FLAG_SUPPORTS_IS_CHILD;            root.title = title;            root.path = path;            root.docId = getDocIdForFile(path);        } catch (FileNotFoundException e) {            throw new IllegalStateException(e);        }    }}