android 9.0以上版本，获取U盘路径的两种方式-Toy模板网

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第一种，通过DocumentProvider:

private void handleDocumentsProvider() {
    String authority = "com.android.externalstorage.documents";
    final Uri rootsUri = DocumentsContract.buildRootsUri("com.android.externalstorage.documents");
    ContentResolver resolver = getContentResolver();
    final ContentProviderClient client = resolver.acquireUnstableContentProviderClient(
            authority);
    final PackageManager pm = getPackageManager();
    ProviderInfo provider = pm.resolveContentProvider(
            authority, PackageManager.GET_META_DATA);
    if (provider == null) {
        Log.w(TAG, "Failed to get provider info for " + authority);
    }
    if (!provider.exported) {
        Log.w(TAG, "Provider is not exported. Failed to load roots for " + authority);
    }
    if (!provider.grantUriPermissions) {
        Log.w(TAG, "Provider doesn't grantUriPermissions. Failed to load roots for "
                + authority);
    }

    if (!android.Manifest.permission.MANAGE_DOCUMENTS.equals(provider.readPermission)
            || !android.Manifest.permission.MANAGE_DOCUMENTS.equals(provider.writePermission)) {
        Log.w(TAG, "Provider is not protected by MANAGE_DOCUMENTS. Failed to load roots for "
                + authority);
    }

    Cursor cursor = null;
    try {
        cursor = client.query(rootsUri, null, null, null, null);
    } catch (RemoteException e) {
        e.printStackTrace();
    }
    while (cursor.moveToNext()) {
        String rootId = getCursorString(cursor, DocumentsContract.Root.COLUMN_ROOT_ID);
        String title = getCursorString(cursor, DocumentsContract.Root.COLUMN_TITLE);
        String summary = getCursorString(cursor, DocumentsContract.Root.COLUMN_SUMMARY);
        String documentId = getCursorString(cursor, DocumentsContract.Root.COLUMN_DOCUMENT_ID);
        long availableBytes = getCursorLong(cursor, DocumentsContract.Root.COLUMN_AVAILABLE_BYTES);
        long capacityBytes = getCursorLong(cursor, DocumentsContract.Root.COLUMN_CAPACITY_BYTES);
        String mimeTypes = getCursorString(cursor, DocumentsContract.Root.COLUMN_MIME_TYPES);
        String flags = getCursorString(cursor, DocumentsContract.Root.COLUMN_FLAGS);
        DocumentPathBean documentPathBean = new DocumentPathBean(rootId, title, documentId, availableBytes, flags, "/storage/" + rootId);

        Log.e(TAG, "rootId:" + rootId + "flags:" + flags);
        if(!"primary".equals(rootId) && !"home".equals(rootId)){
        Log.e(TAG, "rootId:" + rootId + "title:" + title
                +"summary:" + summary +"documentId:" + documentId +"availableBytes:" + availableBytes +"capacityBytes:" + capacityBytes +"mimeTypes:" + mimeTypes);
        }
    }


}

第二种,通过StorageManager,无法使用的记得用反射;文章来源地址https://www.toymoban.com/news/detail-541661.html

    private HashMap<String, String> getUsbDrivePath() {

        final StorageManager sm = getSystemService(StorageManager.class);
        final List<StorageVolume> volumes = sm.getStorageVolumes();
        HashMap<String, String> paths = new HashMap<>();
        volumes.forEach(new Consumer<StorageVolume>() {
            @Override
            public void accept(StorageVolume volume) {
                File path = volume.getPathFile();

                if (volume.isPrimary()) {
                    Log.v("storageVolume:", "put desc primary");
//                    pathMap.put("primary",path.getAbsolutePath());
                } else {
                    String state = volume.getState();
                    Log.v("storageVolume:", "path" + path.exists());
                    Log.v("storageVolume:", "path isDirectory" + path.isDirectory());
                    Log.v("storageVolume:", "path isFile " + path.isFile());
                    Log.v("storageVolume:", "path " + path.getAbsolutePath());
                    Log.v("storageVolume:", "put desc " + volume.getDescription(DocumentActivity.this) + "volume.isPrimary:" + volume.isPrimary());
//                String mediaStoreVolumeName = storageVolume.getMediaStoreVolumeName();
//                String absolutePath = storageVolume.getDirectory().getAbsolutePath();


                }


            }


        });

        return paths;

    }

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