磁盘可用空间计算

    /*
    * 初始化标题数据
    * */
    private void initTitle() {
        TextView tvPhoneMemory = (TextView) findViewById(R.id.tv_phone_memory);
        TextView tvSDMemory = (TextView) findViewById(R.id.tv_sd_memory);
        // 获得外部存储与手机的根文件夹路径
        String path = Environment.getDataDirectory().getAbsolutePath();
        String sdPath = Environment.getExternalStorageDirectory().getAbsolutePath();
        // 调用自定义函数获得手机的可用空间大小
        long getpath = getAvaliableSpace(path);
        long getSdPath = getAvaliableSpace(sdPath);
        tvPhoneMemory.setText(Formatter.formatFileSize(this,getpath));
        tvSDMemory.setText(Formatter.formatFileSize(this,getSdPath));
    }

    private long getAvaliableSpace(String path) {
        // 声明磁盘可用空间大小的类
        StatFs statFs = new StatFs(path);
        // 总的可用空间= 可用区块数 * 区块大小大小
        long count = statFs.getAvailableBlocks();//个数
        long size = statFs.getBlockSize();// 每个的大小
        return count * size;
    }