我怎样才能以百分比的形式获得已用内存?

How can I get used RAM in percent?

我正在尝试获取已用 RAM 的百分比,但此代码仅以 MB 为单位提供已用 RAM。我怎样才能得到它的百分比?

private void Used(){
    ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
    ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
    activityManager.getMemoryInfo(mi);
    long availableMegs = mi.availMem / 1048576L;
    long used = TotalRam() - availableMegs ;
    crpv.setPercent();
    crpv.setPercent(used);
    tvPercent.setText(used+" MB");
}
double percentUsed = 1.0 * used / TotalRam();