Internet Downloading & Uploading Speed

AndroidManifest.xml

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

 <uses-permission android:name="android.permission.INTERNET"/>

 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/> 

<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE"/>

 <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     

android:id="@+id/LinearLayout1"    android:layout_width="fill_parent"     

android:layout_height="fill_parent"    android:orientation="vertical" >


    <ScrollView 

 android:layout_width="match_parent"         

android:layout_height="wrap_content"> 

<LinearLayout 

 android:id="@+id/layout1" 

 android:layout_width="wrap_content" 

 android:layout_height="wrap_content" 

 android:orientation="vertical"> 

</LinearLayout> 

</ScrollView> 

</LinearLayout>

MainActivity.java

import android.net.TrafficStats; 

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle; 

import android.widget.LinearLayout;

import android.widget.TextView; 

 public class MainActivity extends AppCompatActivity {

  LinearLayout llayout;     

  String uploadSpeed, downloadSpeed = null; 

  String speedError = null; 

  int chechLength = 10; 

  TextView[] tvDownload, tvUpload;
    // ---- 

  long BeforeTime ,TotalTxBeforeTest, TotalRxBeforeTest , TotalTxAfterTest , TotalRxAfterTest, AfterTime;
  double TimeDifference , rxDiff , txDiff; 

     @Override 

 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState); 

 setContentView(R.layout.activity_main);
 llayout = (LinearLayout)findViewById(R.id.layout1) ;
 tvDownload = new TextView[chechLength];              

 tvUpload = new TextView[chechLength]; 

 for(int i=0;i<chechLength;i++)
 {
  tvDownload[i] = new TextView(this);                     

  tvUpload[i] = new TextView(this); 

 try {
      Thread.sleep(1000);
      BeforeTime = System.currentTimeMillis(); 

      TotalTxBeforeTest = TrafficStats.getTotalTxBytes();                         

      TotalRxBeforeTest = TrafficStats.getTotalRxBytes(); 

      } catch (InterruptedException e) {
      e.printStackTrace();                     

      }
      /* DO WHATEVER NETWORK STUFF YOU NEED TO DO */ 

 try {
      Thread.sleep(1000); 

      TotalTxAfterTest = TrafficStats.getTotalTxBytes();                         

      TotalRxAfterTest = TrafficStats.getTotalRxBytes(); 

      AfterTime = System.currentTimeMillis();                     

     } catch (InterruptedException e) {
       e.printStackTrace();                    }
       TimeDifference = AfterTime - BeforeTime;
       rxDiff = TotalRxAfterTest - TotalRxBeforeTest; 

       txDiff = TotalTxAfterTest - TotalTxBeforeTest;                     

       if((rxDiff != 0) || (txDiff != 0)) {
       double rxBPS = (rxDiff / (TimeDifference/1000));  

       // total rx bytes per second.                         

       double txBPS = (txDiff / (TimeDifference/1000)); 

       // total tx bytes per second.                         

       downloadSpeed = String.valueOf((rxBPS*8)/1024); 

       uploadSpeed = String.valueOf((txBPS*8)/1024);                       

       /*downloadSpeed = String.valueOf((rxBPS)/1024) + "KB/s. Total rx = " + rxDiff; 

       uploadSpeed = String.valueOf((txBPS)/1024) + "KB/s. Total tx = " + txDiff; 

 */ 

       tvDownload[i].setText("DOWNLOAD : "+downloadSpeed+" Kpps"); 

       tvUpload[i].setText("UPLOAD   : "+uploadSpeed + "  Kbps");

       }
         else {
        speedError = "No uploaded or downloaded bytes."; 

        tvDownload[i].setText("DOWNLOAD : "+speedError);                           

        tvUpload[i].setText("UPLOAD   : "+speedError);
                    }
                    llayout.addView(tvDownload[i]); 

                    llayout.addView(tvUpload[i]);                }
    }

}

///