Android检测SD卡是否可用，Android获取磁盘可用空间，Android获取磁盘根目录

       <pre name="code" class="java">       /** * SD卡是否可用 * @author YOLANDA * @return */public static boolean sdCardIsAvailable() {if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {File sd = new File(Environment.getExternalStorageDirectory().getPath());if (sd.canWrite())return true;elsereturn false;} elsereturn false;}

       /** * 得到SD卡根目录 * @author YOLANDA * @return */public static File getRootPath(){File path = null;if (FileUtil.sdCardIsAvailable()) {path = Environment.getExternalStorageDirectory(); // 取得sdcard文件路径} else {path = Environment.getDataDirectory();}return path;}

/** * 获取磁盘可用空间 * @author YOLANDA * @return */@SuppressWarnings("deprecation")@SuppressLint("NewApi")public static long getSDCardAvailaleSize() {File path = getRootPath();StatFs stat = new StatFs(path.getPath());long blockSize ,availableBlocks;if(Build.VERSION.SDK_INT > 17){blockSize = stat.getBlockSizeLong();availableBlocks = stat.getAvailableBlocksLong();}else{blockSize = stat.getBlockSize();availableBlocks = stat.getAvailableBlocks();}return availableBlocks * blockSize;}

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