Android Studio获取wifi列表等信息

SSID为wifi的名称

BSSID为wifi的mac地址

level为wifi的信号强度

 

main_activity.java:

package com.example.myapplication;

import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import java.util.Timer;
import java.util.TimerTask;
import android.annotation.SuppressLint;
import android.os.Handler;
import android.os.Message;
import android.widget.Toast;
import java.util.List;
import android.net.wifi.ScanResult;

public class MainActivity extends AppCompatActivity {

    private WifiInfo wifiInfo = null;       //获得的Wifi信息
    private WifiManager wifiManager = null; //Wifi管理器
    private Handler handler;
    private int level;                      //信号强度值
    private String macAddress;              //wifi信号BSSID值
    List listb;


    @SuppressLint("HandlerLeak")
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 获得WifiManager
        wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
        // 使用定时器,每隔5秒获得一次信号强度值
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {


                listb = wifiManager.getScanResults();
                //数组初始化要注意
                String[] listSSID = new String[listb.size()];
                String[] listBSSID = new String[listb.size()];
                int[] listLevel = new int[listb.size()];
                if (listb != null) {
                    for (int i = 0; i < listb.size(); i++) {
                        ScanResult scanResult = listb.get(i);
                        listSSID[i] = scanResult.SSID;
                        listBSSID[i] = scanResult.BSSID;
                        listLevel[i] = scanResult.level;
                    }
                }
                String[] listSSID0 = new String[listb.size()];
                String[] listBSSID0 = new String[listb.size()];
                int[] listLevel0 = new int[listb.size()];
                if (listb == null) {
                    listSSID0[0] = "NoWiFi";
                    listBSSID0[0] = "NoWiFi";
                    listLevel[0] = -200; //-200默认没有wifi
                } else {
                    listSSID0 = listSSID;
                    listBSSID0 = listBSSID;
                    listLevel0 = listLevel;
                }
                for (int i = 0; i < listb.size(); i++) {
                    Log.d("wifi", listSSID0[i] + "//" + listBSSID0[i] + "//" + listLevel0[i]);
                }
                Log.d("wifi", "=======================");
                wifiInfo = wifiManager.getConnectionInfo();
                //获得信号强度值
                level = wifiInfo.getRssi();
                macAddress = wifiInfo.getBSSID();
                Message msg = new Message();
                handler.sendMessage(msg);
            }

        }, 1000, 5000);
        // 使用Handler实现UI线程与Timer线程之间的信息传递,每5秒告诉UI线程获得wifiInto
        handler = new Handler() {

            @Override
            public void handleMessage(Message msg) {
                Toast.makeText(MainActivity.this,
                        "信号强度：" + level + "  BSSID: " + macAddress, Toast.LENGTH_SHORT)
                        .show();
            }

        };

    }
}

AndroidManifest.xml中获取wifi的权限：

 

参考：https://blog.csdn.net/zoukai1587/article/details/89639169

 

对于Android6.0以上版本，需要添加兼容性：

MainActivity.java代码：

package com.example.zlf_empty;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.util.Log;

import java.util.Timer;
import java.util.TimerTask;

import android.annotation.SuppressLint;
import android.os.Handler;
import android.os.Message;
import android.widget.Toast;

import java.util.List;

import android.net.wifi.ScanResult;
import java.io.IOException;
import android.os.Build;
import android.Manifest;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;

public class MainActivity extends AppCompatActivity {

    private WifiInfo wifiInfo = null;       //获得的Wifi信息
    private WifiManager wifiManager = null; //Wifi管理器
    private Handler handler;
    private int level;                      //信号强度值
    private String macAddress;              //wifi信号BSSID值
    List listb;
    private static final int REQUEST_CODE_ACCESS_COARSE_LOCATION = 1;

    @SuppressLint("HandlerLeak")
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 获得WifiManager
        wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
        // 判断wifi是否开启
        if(! wifiManager.isWifiEnabled()){
            if(wifiManager.getWifiState() != WifiManager.WIFI_STATE_ENABLING)
                wifiManager.setWifiEnabled(true);
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//如果 API level 是大于等于 23(Android 6.0) 时
            //判断是否具有权限
            if (ContextCompat.checkSelfPermission(this,
                    Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                //判断是否需要向用户解释为什么需要申请该权限
                if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                        Manifest.permission.ACCESS_COARSE_LOCATION)) {
                    //showToast("自Android 6.0开始需要打开位置权限");
                }
                //请求权限
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
                        REQUEST_CODE_ACCESS_COARSE_LOCATION);
            }
        }

        // 使用定时器,每隔5秒获得一次信号强度值
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                listb = wifiManager.getScanResults();
                Log.d("wifi","listb"+listb);
                Log.d("wifi","listb.size()"+listb.size());
                //数组初始化要注意
                String[] listSSID = new String[listb.size()];
                String[] listBSSID = new String[listb.size()];
                int[] listLevel = new int[listb.size()];
                if (listb != null) {
                    for (int i = 0; i < listb.size(); i++) {
                        ScanResult scanResult = listb.get(i);
                        listSSID[i] = scanResult.SSID;
                        listBSSID[i] = scanResult.BSSID;
                        listLevel[i] = scanResult.level;
                    }
                }
                String[] listSSID0 = new String[listb.size()];
                String[] listBSSID0 = new String[listb.size()];
                int[] listLevel0 = new int[listb.size()];
                if (listb == null) {
                    listSSID0[0] = "NoWiFi";
                    listBSSID0[0] = "NoWiFi";
                    listLevel[0] = -200; //-200默认没有wifi
                } else {
                    listSSID0 = listSSID;
                    listBSSID0 = listBSSID;
                    listLevel0 = listLevel;
                }
                for (int i = 0; i < listb.size(); i++) {
                    Log.d("wifi", listSSID0[i] + "//" + listBSSID0[i] + "//" + listLevel0[i]);
                }
                Log.d("wifi", "=======================");
                wifiInfo = wifiManager.getConnectionInfo();
                //获得信号强度值
                level = wifiInfo.getRssi();
                macAddress = wifiInfo.getBSSID();
                Message msg = new Message();
                handler.sendMessage(msg);
            }

        }, 1000, 5000);
        // 使用Handler实现UI线程与Timer线程之间的信息传递,每5秒告诉UI线程获得wifiInto
        handler = new Handler() {

            @Override
            public void handleMessage(Message msg) {
                Toast.makeText(MainActivity.this,
                        "信号强度：" + level + "  BSSID: " + macAddress, Toast.LENGTH_SHORT)
                        .show();
            }

        };

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == REQUEST_CODE_ACCESS_COARSE_LOCATION) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                //用户允许改权限，0表示允许，-1表示拒绝 PERMISSION_GRANTED = 0， PERMISSION_DENIED = -1
                //permission was granted, yay! Do the contacts-related task you need to do.
                //这里进行授权被允许的处理
            } else {
                //permission denied, boo! Disable the functionality that depends on this permission.
                //这里进行权限被拒绝的处理
            }
        } else {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }

}

AndroidManifest.xml增加的权限：

参考链接：http://www.pianshen.com/article/2568263532/