android获取sdcard可用、已用空间大小的方法：

/**
* 获取sdcard使用情况
*/
private void setSdcardInfo(){
	if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
		File filePath = Environment.getExternalStorageDirectory();    //获得sd卡的路径
		StatFs stat=new StatFs(filePath.getPath());                 //创建StatFs对象
		long blockSize=stat.getBlockSize();                         //获取block的size
		float totalBlocks=stat.getBlockCount();                     //获取block的总数
		float totalGbSize = (blockSize*totalBlocks)/1024/1024/1024;
		DecimalFormat df = new DecimalFormat("#0.0");
		String totalGbSizeStr = df.format(totalGbSize);            //总共大小
		long availableBlocks=stat.getAvailableBlocks();             //获取可用块大小
		String usedTotalGbSizeStr = df.format((totalBlocks – availableBlocks) * blockSize /1024/1024/1024);//已用大小
		System.out.println("存储空间"+totalGbSizeStr+"G,已用"+usedTotalGbSizeStr+"G");
	}
	else{
		Toast.makeText(this,"SD卡不存在",Toast.LENGTH_LONG).show();
	}
}

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