androd 获得wifi列表

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.yanlei.wifi" >
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <!-- 在SDCard中创建与删除文件权限 -->

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

    <!-- 连接<a href="http://www.it165.net/news/nhlw/" target="_blank" class="keylink">互联网</a>Internet权限 -->
    <uses-permission android:name="android.permission.INTERNET" />
    <!-- GPS定位权限 -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <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.INTERNET" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

activity_main.xml

<RelativeLayout 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=".WifiListActivity" >

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</RelativeLayout>  

item_wifi_list.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/imageView"
        android:layout_marginBottom="14dp"
        android:layout_toRightOf="@+id/imageView"
        android:text="TextView" />

    <TextView
        android:id="@+id/signal_strenth"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView"
        android:layout_alignBottom="@+id/textView"
        android:layout_alignParentRight="true"
        android:text="TextView" />

</RelativeLayout>

MainActivity.java

package com.example.yanlei.wifi;

import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    private WifiManager wifiManager;
    List<ScanResult> list;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }

    private void init() {
        wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        openWifi();
        list = wifiManager.getScanResults();
        ListView listView = (ListView) findViewById(R.id.listView);
        if (list == null) {
            Toast.makeText(this, "wifi未打开！", Toast.LENGTH_LONG).show();
        }else {
            listView.setAdapter(new MyAdapter(this,list));
        }

    }

    /**
     *  打开WIFI
     */
    private void openWifi() {
        if (!wifiManager.isWifiEnabled()) {
            wifiManager.setWifiEnabled(true);
        }

    }

    public class MyAdapter extends BaseAdapter {

        LayoutInflater inflater;
        List<ScanResult> list;
        public MyAdapter(Context context, List<ScanResult> list) {
            // TODO Auto-generated constructor stub
            this.inflater = LayoutInflater.from(context);
            this.list = list;
        }

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return list.size();
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return position;
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            View view = null;
            view = inflater.inflate(R.layout.item_wifi_list, null);
            ScanResult scanResult = list.get(position);
            TextView textView = (TextView) view.findViewById(R.id.textView);
            textView.setText(scanResult.SSID);
            TextView signalStrenth = (TextView) view.findViewById(R.id.signal_strenth);
            signalStrenth.setText(String.valueOf(Math.abs(scanResult.level)));
            ImageView imageView = (ImageView) view.findViewById(R.id.imageView);
            //判断信号强度，显示对应的指示图标
            if (Math.abs(scanResult.level) > 100) {
                imageView.setImageDrawable(getResources().getDrawable(R.drawable.a0));
            } else if (Math.abs(scanResult.level) > 80) {
                imageView.setImageDrawable(getResources().getDrawable(R.drawable.a1));
            } else if (Math.abs(scanResult.level) > 70) {
                imageView.setImageDrawable(getResources().getDrawable(R.drawable.a0));
            } else if (Math.abs(scanResult.level) > 60) {
                imageView.setImageDrawable(getResources().getDrawable(R.drawable.a1));
            } else if (Math.abs(scanResult.level) > 50) {
                imageView.setImageDrawable(getResources().getDrawable(R.drawable.a0));
            } else {
                imageView.setImageDrawable(getResources().getDrawable(R.drawable.a1));
            }
            return view;
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

来自：android wifi讲解 wifi列表显示