How to show list of all folders in android file system specially SD card

Question

在我的应用程序中，我想在列表视图中显示SD卡上的所有文件夹，并且需要这样的功能：如果用户单击文件夹，它将显示其子目录。

Answer 1

File f = new File(path);
File[] files = f.listFiles();
for (File inFile : files) {
    if (inFile.isDirectory()) {
        // is directory
    }
}

This will return you the list of folders in your path. From here: https://stackoverflow.com/a/6997422/2065418