public class StorageUtils {

    private static String TAG="123";

    // 获取主存储卡路径 内置内存卡路径

    public static String getPrimaryStoragePath(Context context) {

        try {

            StorageManager sm = (StorageManager) context.getSystemService(context.STORAGE_SERVICE);

            Method getVolumePathsMethod = StorageManager.class.getMethod("getVolumePaths");

            String[] paths = (String[]) getVolumePathsMethod.invoke(sm);

            // first element in paths[] is primary storage path

            return paths[0];

        } catch (Exception e) {

            Log.e(TAG, "getPrimaryStoragePath() failed", e);

        }

        return null;

    }

    //获取可用的所有外置内存卡路径

    public static List<String> getSecondaryStoragePath(Context context) {

        try {

            List<String> sdPaths=new ArrayList<>();

            StorageManager sm = (StorageManager) context.getSystemService(context.STORAGE_SERVICE);

            Method getVolumePathsMethod = StorageManager.class.getMethod("getVolumePaths");

            String[] paths = (String[]) getVolumePathsMethod.invoke(sm);//获取所有sd卡路径

            if(paths.length>=1){

                for (int i = 1; i <paths.length ; i++) {

                    if(getStorageState(context,paths[i])){

                        sdPaths.add(paths[i]);

                    }

                }

            }

            return sdPaths;

        } catch (Exception e) {

            Log.e(TAG, "getSecondaryStoragePath() failed", e);

        }

        return null;

    }

    // 判断存储卡的路径是否可用

    public static boolean getStorageState(Context context,String path) {

        try {

            StorageManager sm = (StorageManager) context.getSystemService(context.STORAGE_SERVICE);

            Method getVolumeStateMethod = StorageManager.class.getMethod("getVolumeState", new Class[] {String.class});

            String state = (String) getVolumeStateMethod.invoke(sm, path);

            if(state.equals(Environment.MEDIA_MOUNTED_READ_ONLY)||state.equals(Environment.MEDIA_MOUNTED)){

                return true;

            }

            return false;

        } catch (Exception e) {

            Log.e(TAG, "getStorageState() failed", e);

            return false;

        }

    }

}