【Android】Wifi管理与应用

检测是否有WIFI可用

WifiManager mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);  if (mWifiManager != null) {   List<ScanResult> wifiScanResults = mWifiManager.getScanResults();         if (wifiScanResults != null && wifiScanResults.size() != 0) {                                    }   }  

检测是否开启WIFI

WifiManager mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);   if (wifiManager.isWifiEnabled()) {   wifiManager.setWifiEnabled(false);   } else {   wifiManager.setWifiEnabled(true);   }  

Menifest.xml文件进行权限登记

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

应用范例

Activity

package com.app.myweb;import java.util.List;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.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class WifiTest extends Activity{private WifiManager wifiManager ;private Button button;private TextView textView1,textView2;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.wifi);button = (Button) findViewById(R.id.button1);textView1 = (TextView) findViewById(R.id.textView1);textView2 = (TextView) findViewById(R.id.textView2);wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);if (wifiManager.isWifiEnabled()) {//判断Wifi是否开启textView1.setText("WIFI开关：已启用");button.setText("关闭Wifi");} else {textView1.setText("WIFI开关：已关闭");button.setText("打开Wifi");}button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (button.getText().equals("关闭Wifi")) {wifiManager.setWifiEnabled(false);textView1.setText("WIFI开关：已关闭");button.setText("打开Wifi");} else if (button.getText().equals("打开Wifi")) {wifiManager.setWifiEnabled(true);textView1.setText("WIFI开关：已启用");button.setText("关闭Wifi");}}});StringBuilder sBuilder = new StringBuilder();if (wifiManager != null) {List<ScanResult> wifiResults = wifiManager.getScanResults();if (wifiResults != null && wifiResults.size() != 0) {for (int i = 0; i < wifiResults.size(); i++) {ScanResult wifi = wifiResults.get(i);System.out.println(wifi.BSSID);sBuilder.append("第"+i+"个可用Wifi：\n");sBuilder.append("Wifi名称："+wifi.BSSID + "\n");}} else {Toast.makeText(this, "请检查Wifi是否开启", Toast.LENGTH_LONG).show();sBuilder.append("没有可用Wifi，请检查Wifi是否开启！");}}textView2.setText(sBuilder);}}

XML布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:padding="10dp" >    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="wrap_content" >        <TextView            android:id="@+id/textView1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerVertical="true"            android:text="WIFI开关" />        <Button            android:id="@+id/button1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentRight="true"            android:text="开启Wifi" />    </RelativeLayout>    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="可用Wifi列表" /></LinearLayout>