Android擷取SD卡總容量，可用大小，機身記憶體總容量及可用大小

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public long getSDTotalSize(){    /*擷取儲存卡路徑*/    File sdcardDir= Environment.getExternalStorageDirectory();    /*StatFs 看檔案系統空間使用方式*/    StatFs statFs=new StatFs(sdcardDir.getPath());    long blockSize= statFs.getBlockSizeLong();    long totalSize=statFs.getBlockCountLong();    return blockSize*totalSize;}    /**     * 獲得sd卡剩餘容量，即可以大小     * @return     */    public long getSdAvaliableSize()    {        File path=Environment.getExternalStorageDirectory();        StatFs statFs=new StatFs(path.getPath());        long blockSize=statFs.getBlockSizeLong();        long availableBlocks=statFs.getAvailableBlocksLong();        return blockSize*availableBlocks;    }    /**     * 獲得機身記憶體大小     * @return     */    public long getRomTotalSize()    {        File path=Environment.getDataDirectory();        StatFs statFs=new StatFs(path.getPath());        long blockSize=statFs.getBlockSizeLong();        long tatalBlocks= statFs.getBlockCountLong();     return blockSize*tatalBlocks;    }    /**     * 獲得機身可用記憶體     * @return     */    private long getRomAvailableSize()    {        File path=Environment.getDataDirectory();        StatFs statFs=new StatFs(path.getPath());        long blockSize=statFs.getBlockSizeLong();        long availableBlocks=statFs.getAvailableBlocksLong();        return blockSize*availableBlocks;    }