获取SD卡剩余容器

    File path = Environment.getExternalStorageDirectory();

        StatFs stat = new StatFs(path.getPath());

        long blockSize;   //分区大 小

        long totalBlocks;  //总分区

        long availableBlocks; //可用分区

        //判断当前版本是否是4.3或以上

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2){

             blockSize = stat.getBlockSizeLong();

             totalBlocks = stat.getBlockCountLong();

             availableBlocks = stat.getAvailableBlocksLong();

        }

        else{

             blockSize = stat.getBlockSize();

             totalBlocks = stat.getBlockCount();

             availableBlocks = stat.getAvailableBlocks();

        }

        /*（availableBlocks * blockSize）= 可用内存大小*/

        String text = formatSize(availableBlocks * blockSize);

        

        TextView tv = (TextView) findViewById(R.id.tv); 

        tv.setText(text);

    }

    private String formatSize(long size) {

        return Formatter.formatFileSize(this, size);//

    }