Android实时获得周围wifi信息（SSID，强度等）

转载请注明出处，谢谢！
1.首先在Manifext里声明权限：

android:name="android.permission.ACCESS_WIFI_STATE" />android:name="android.permission.INTERNET" />android:name="android.permission.ACCESS_NETWORK_STATE" />android:name="android.permission.CHANGE_NETWORK_STATE"/>android:name="android.permission.CHANGE_WIFI_STATE"/>

2.创建一个TextView用来显示wifi信息：

<?xml version="1.0" encoding="utf-8"?>xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.edu.tongji.wifi_around.MainActivity">            android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="New Text"        android:id="@+id/textView"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true" />

3.然后是MianActivity：

package com.edu.tongji.wifi_around;import android.net.wifi.ScanResult;import android.net.wifi.WifiManager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.TextView;import java.util.List;public class MainActivity extends AppCompatActivity {    private TextView textView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        textView = (TextView)findViewById(R.id.textView);        ScanWifiInfo();        //写线程        Thread t = new Thread(new Runnable() {            @Override            public void run() {                while(true)                {                    runOnUiThread(new Runnable() {                        @Override                        public void run() {                            ScanWifiInfo();                        }                    });                    try{Thread.sleep(500);}catch(InterruptedException e){e.printStackTrace();}                }            }        });        t.start();    }    private void ScanWifiInfo(){        WifiManager wifiManager= (WifiManager) getSystemService(WIFI_SERVICE);        wifiManager.startScan(); //启动扫描        StringBuilder scanBuilder= new StringBuilder();        List scanResults=wifiManager.getScanResults();//搜索到的设备列表        for (ScanResult scanResult : scanResults) {            scanBuilder.append("\n设备名："+scanResult.SSID                    +"\n信号强度："+wifiManager.calculateSignalLevel(scanResult.level,1001)+"\n");        }        textView.setText(scanBuilder); }}

最后是效果图：

wifi强度会实时改变

如有问题请在下方评论处留言。

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