Android获取SDcard目录及创建文件夹；

• 获取sdcard目录

 public static String getSDPath() {
        File sdDir = null;
boolean sdCardExist = Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);// 判断sd卡是否存在
if (sdCardExist) {
            sdDir = Environment.getExternalStorageDirectory();// 获取跟目录
        }
return sdDir.toString();
    }

• 创建目录，不限目录层级

public static String mkdirs(String path) {
        String sdcard = getSDPath();
if (path.indexOf(getSDPath()) == -1) {
            path = sdcard + (path.indexOf("/") == 0 ? "" : "/") + path;
        }
        File destDir = new File(path);
if (!destDir.exists()) {
            path = makedir(path);
if (path == null) {
return null;
            }
        }
return path;
    }

private static String makedir(String path) {
        String sdPath = getSDPath();
        String[] dirs = path.replace(sdPath, "").split("/");
        StringBuffer filePath = new StringBuffer(sdPath);
for (String dir : dirs) {
if (!"".equals(dir) && !dir.equals(sdPath)) {
                filePath.append("/").append(dir);
                File destDir = new File(filePath.toString());
if (!destDir.exists()) {
boolean b = destDir.mkdirs();
if (!b) {
return null;
                    }
                }
            }
        }
return filePath.toString();
    }

• 所需权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<!-- 在sdcard中创建/删除文件的权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

• 显示本地图片

ImageView view5 = findView(R.id.imageview2);
view5.setImageBitmap(ImageUtils.getLoacalBitmap("/storage/sdcard1/myimage/20160807.jpg"));

public static Bitmap getLoacalBitmap(String url) {
try {
             FileInputStream fis = new FileInputStream(url);
return BitmapFactory.decodeStream(fis);
        } catch (FileNotFoundException e) {
//这里应显示默认图片，如图片无法显示等；从应用资源图片中选取
return null;
        }
   }