Java获取文件大小

/**
* 传入文件路径，可以得到文件的大小信息
* @param path 文件路径
* @return
*/
public static String getFileSize(String path) {
String resourceSizeMb = null;
try {
// 指定路径即可
File f = new File(path);

FileInputStream fis = new FileInputStream(f);

DecimalFormat df = new DecimalFormat("#.##");

// double resourceSize = (double)((double) fis.available() / 1024);
// ELog.e(TAG, "resourceSize:" + resourceSize);

if((double)((double) fis.available() / 1024) > 1000) {
resourceSizeMb = df.format((double)((double) fis.available() / 1024 / 1024)) + "MB";
} else {
resourceSizeMb= df.format((double)((double) fis.available() / 1024)) + "KB";
}

} catch (Exception e) {
e.printStackTrace();
resourceSizeMb = null;
}
return resourceSizeMb;
}

/**
* 调用做具体业务
*/
String fileSize = FileHelper.getFileSize(path);
if (null != fileSize) {
if ("0KB".equals(fileSize)) {
ELog.showToastShort(PhotoListActivity.this,getResources().getString(R.string.video_size0));
return;
}
}