Android下載速度計算

long startTime = System.currentTimeMillis(); // 開始下載時獲取開始時間

long curTime = System.currentTimeMillis();
int usedTime = (int) ((curTime-startTime)/1000);

if(usedTime==0)usedTime = 1;
int downloadSpeed = (downloadSize/usedTime)/1024; // 下載速度