Android获取SDcard目录及创建文件夹；

 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();    }

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" /><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;        }   }

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