Get WiFi link speed and frequency

Example show how to get WiFi link speed and frequency:

When WiFi OFF

package com.blogspot.android_er.androidwifispeedfrequency;

import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 TextView textInfo = (TextView)findViewById(R.id.info);
 TextView textSpeed = (TextView)findViewById(R.id.speed);
 TextView textFreq = (TextView)findViewById(R.id.frequency);

 WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
 if(wifiManager!=null){
 textInfo.setText(wifiManager.toString());
 WifiInfo wifiInfo = wifiManager.getConnectionInfo();
 textSpeed.setText("Link Speed: " + wifiInfo.getLinkSpeed() + wifiInfo.LINK_SPEED_UNITS);
 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
 textFreq.setText("Freuency: " + wifiInfo.getFrequency() + wifiInfo.FREQUENCY_UNITS);
 }
 }else{
 textInfo.setText("wifiManager == null!");
 }
 }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
 
 android_layout_width="match_parent"
 android_layout_height="match_parent"
 android_padding="16dp"
 android_orientation="vertical"
 tools_context="com.blogspot.android_er.androidwifispeedfrequency.MainActivity">

 <TextView
 android_layout_width="wrap_content"
 android_layout_height="wrap_content"
 android_layout_gravity="center_horizontal"
 android_autoLink="web"
 android_text="http://android-er.blogspot.com/"
 android_textStyle="bold" />

 <TextView
 android_id="@+id/info"
 android_layout_width="match_parent"
 android_layout_height="wrap_content"
 android_textStyle="italic"/>
 <TextView
 android_id="@+id/speed"
 android_layout_width="match_parent"
 android_layout_height="wrap_content"
 android_textStyle="bold"
 android_textSize="30dp"/>
 <TextView
 android_id="@+id/frequency"
 android_layout_width="match_parent"
 android_layout_height="wrap_content"
 android_textStyle="bold"
 android_textSize="30dp"/>

</LinearLayout>

uses-permission of "android.permission.ACCESS_WIFI_STATE" is needed in AndroidManifest.xml.

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