Android的WiFi开启与关闭

注意：要首先注册开启和关闭WiFi的权限，

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.wyl.wifi"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="19" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.wyl.wifi.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>

    <!-- 注册WiFi的权限 -->

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

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

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

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

</manifest>

　　MainActivity.java

package com.wyl.wifi;

import android.content.Context;

import android.database.sqlite.SQLiteOpenHelper;

import android.net.wifi.WifiManager;

import android.os.Bundle;

import android.support.v7.app.ActionBarActivity;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

	Button btn;

	Button btn2;

	Button btn3;

	TextView tv;

	EditText et;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		btn = (Button) findViewById(R.id.btn01);// 检查网卡

		btn2 = (Button) findViewById(R.id.btn02);// 开启网卡

		btn3 = (Button) findViewById(R.id.btn03);// 关闭网卡

		et = (EditText)findViewById(R.id.editText2);

		StartWifiListener start = new StartWifiListener();

		CloseWifiListener close = new CloseWifiListener();

		btn2.setOnClickListener(start);

		btn3.setOnClickListener(close);

	}

	class StartWifiListener implements OnClickListener{

		@Override

		public void onClick(View v) {

			//最重要的就是先获取到WifiManager

			WifiManager wifiman = (WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);

			wifiman.setWifiEnabled(true);//开启WiFi

			System.out.println("wifi state --->"+wifiman.getWifiState());

			Toast.makeText(MainActivity.this, ""+wifiman.getWifiState(), Toast.LENGTH_LONG);

		}

	}

	class CloseWifiListener implements OnClickListener{

		@Override

		public void onClick(View v) {

			WifiManager wifiman = (WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);

			wifiman.setWifiEnabled(false);//关闭WiFi

			System.out.println("wifi state --->"+wifiman.getWifiState());

			Toast.makeText(MainActivity.this, ""+wifiman.getWifiState(), Toast.LENGTH_LONG);

		}

	}

}

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Android的WiFi开启与关闭

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