Android 技術總結（014）—— 獲取與轉轉文件的大小（B,KB,MB,GB）

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[java
/**
     * 取得文件大小
     * 
     * @param f
     * @return
     * @throws Exception
     */ 
    public long getFileSizes(File f) throws Exception { 
        long s = 0; 
        if (f.exists()) { 
            FileInputStream fis = null; 
            fis = new FileInputStream(f); 
            s = fis.available(); 
        } else { 
            f.createNewFile(); 
        } 
        return s; 
    } 
 
    /**
     * 轉換文件大小
     * 
     * @param fileS
     * @return
     */ www.2cto.com
    public String FormetFileSize(long fileS) { 
        DecimalFormat df = new DecimalFormat("#.00"); 
        String fileSizeString = ""; 
        if (fileS < 1024) { 
            fileSizeString = df.format((double) fileS) + "B"; 
        } else if (fileS < 1048576) { 
            fileSizeString = df.format((double) fileS / 1024) + "K"; 
        } else if (fileS < 1073741824) { 
            fileSizeString = df.format((double) fileS / 1048576) + "M"; 
        } else { 
            fileSizeString = df.format((double) fileS / 1073741824) + "G"; 
        } 
        return fileSizeString; 
    }