• 獲取sdcard目錄

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

• 建立目錄，不限目錄層級

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();
    }

• 所需許可權

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<!-- 在sdcard中建立/刪除檔案的許可權 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

• 顯示本地圖片

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) {
             //這裡應顯示預設圖片，如圖片無法顯示等；從應用資源圖片中選取
             return null;
        }
   }