Android实战简易教程-第七十七枪（获取附近可用WIFI列表 附新书地址）

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

 

2.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>

 

3.MainActivity.java:

package demo.androidwar.com.actionbardemo;import android.app.Activity;import android.content.Context;import android.net.wifi.ScanResult;import android.net.wifi.WifiManager;import android.os.Bundle;import android.view.LayoutInflater;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 Activity {    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);        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));        }    }    public class MyAdapter extends BaseAdapter {        LayoutInflater inflater;        List<ScanResult> list;        public MyAdapter(Context context, List<ScanResult> list) {            this.inflater = LayoutInflater.from(context);            this.list = list;        }        @Override        public int getCount() {            return list.size();        }        @Override        public Object getItem(int position) {            return position;        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            View 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.stat_sys_wifi_signal_0));            } else if (Math.abs(scanResult.level) > 80) {                imageView.setImageDrawable(getResources().getDrawable(R.drawable.stat_sys_wifi_signal_1));            } else if (Math.abs(scanResult.level) > 70) {                imageView.setImageDrawable(getResources().getDrawable(R.drawable.stat_sys_wifi_signal_1));            } else if (Math.abs(scanResult.level) > 60) {                imageView.setImageDrawable(getResources().getDrawable(R.drawable.stat_sys_wifi_signal_2));            } else if (Math.abs(scanResult.level) > 50) {                imageView.setImageDrawable(getResources().getDrawable(R.drawable.stat_sys_wifi_signal_3));            } else {                imageView.setImageDrawable(getResources().getDrawable(R.drawable.stat_sys_wifi_signal_4));            }            return view;        }    }}

实例化WifiManager对象，并调用其getScanResults方法返回WIFI扫描到的列表。主要要配置权限：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="demo.androidwar.com.actionbardemo">    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

运行项目实例：

 

**喜欢的朋友请关注我，另欢迎阅读我的电子书 
百度阅读： 
**喜欢的朋友请关注我，另欢迎阅读我的电子书 

 

百度阅读： 
http://yuedu.baidu.com/ebook/284b41a1e518964bce847c90?pn=1&click_type=10010002&rf=http%3A%2F%2Fblog.csdn.net%2Fyayun0516%2Farticle%2Fdetails%2F51277821 

http://yuedu.baidu.com/ebook/7ab931faa32d7375a5178060?pn=1&click_type=10010002&rf=http%3A%2F%2Fyuedu.baidu.com%2Fsearch%3Fword%3DAndroid%25BF%25D8%25BC%25FE%26pbook%3D0
亚马逊： 
http://www.amazon.cn/android-%E7%99%BE%E6%88%98%E7%BB%8F%E5%85%B8-%E5%8D%B7I-%E5%BC%A0%E4%BA%9A%E8%BF%90/dp/B01ER5R9U2?ie=UTF8&keywords=Android%E7%BB%8F%E5%85%B8&qid=1461806976&ref_=sr_1_6&s=digital-text&sr=1-6**