获取wifi当前手机连接的wifi信息以及信号强度

1、获得WifiManager对象

WifiManager wm = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

2、通过WifiManager对象获得wifi信息

WifiInfo info = wm.getConnectionInfo();

3、通过WifiInfo获得wifi信息

//通过wifi管理对象获得wifi信息
                        WifiInfo info = wm.getConnectionInfo();
                        //获取wifi名称
                        String ssid = info.getSSID().replace("\"", "");
                        //获取mac地址
                        String MacAddr = info.getMacAddress();
                        //获取当前连接速度
                        int linkSpeed = info.getLinkSpeed();
                        //获取ip地址
                        int ipAddr = info.getIpAddress();
                        ......

xml代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="20dp"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="SSID:"
        android:textColor="@android:color/black"
        android:textSize="30sp" />

    <TextView
        android:id="@+id/wifiSSID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/textView1"
        android:text="-"
        android:textColor="@android:color/black"
        android:textSize="30sp" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="信号强度"
        android:layout_below="@id/textView1"
        android:textColor="@android:color/black"
        android:textSize="30sp" />

    <ImageView
        android:id="@+id/ivWifi"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView2"
        android:background="@drawable/wifi1"/>

</RelativeLayout>

主函数代码

import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private WifiManager wm;
    private TextView wifiSSID;
    private ImageView ivWifi;

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

    private void initView() {
        wifiSSID = findViewById(R.id.wifiSSID);
        ivWifi = findViewById(R.id.ivWifi);
    }

    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 1:
                    wifiSSID.setText(msg.obj.toString());
                    if (msg.arg1 <= 50) {
                        ivWifi.setBackgroundResource(R.drawable.wifi4);
                    } else if (msg.arg1 <= 70) {
                        ivWifi.setBackgroundResource(R.drawable.wifi3);
                    } else if (msg.arg1 <= 100) {
                        ivWifi.setBackgroundResource(R.drawable.wifi2);
                    }
                    break;
                case 2:
                    wifiSSID.setText("-");
                    ivWifi.setBackgroundResource(R.drawable.wifi1);
                    break;
            }
        }
    };

    private void initWifi() {
        Thread thread = new Thread() {
            @Override
            public void run() {
                while (true) {
                    try {
                        sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    //拿到wifi管理对象
                    wm = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
                    if (wm.isWifiEnabled()) {
                        //通过wifi管理对象获得wifi信息
                        WifiInfo info = wm.getConnectionInfo();
                        //获取wifi名称
                        String ssid = info.getSSID().replace("\"", "");
                        //获取mac地址
                        String MacAddr = info.getMacAddress();
                        //获取当前连接速度
                        int linkSpeed = info.getLinkSpeed();
                        //获取ip地址
                        int ipAddr = info.getIpAddress();

                        Message msg = Message.obtain();
                        msg.what = 1;
                        msg.obj = ssid;
                        /**
                        *	getRssi()返回的是一个-100到0的数，直接取绝对值
                        *	-50到0表示信号好
                        *	-50到-70表示信号一般
                        *	-70到-100表示信号差
                        */
                        msg.arg1 = Math.abs(info.getRssi());
                        handler.sendMessage(msg);
                    } else {
                        Message msg = Message.obtain();
                        msg.what = 2;
                        handler.sendMessage(msg);
                    }
                }
            }
        };
        thread.start();
    }


}

最后给权限

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