android 之WIFI操作

wifi网卡的状态

1.WIFI_STATE_DISABLED:WIFI网卡不可用

2.WIFI_STATE_DISABLING:WIFI网卡正在关闭

1.WIFI_STATE_EWNABLED:WIFI网卡可用

1.WIFI_STATE_ENABLING:WIFI网卡正在打开

1.WIFI_STATE_UNKNOWN:未知网卡状态

改变WIFI网卡的状态

对WIFI网卡进行操作需要通过WifiManager对象进行，获取该对象的方法如下：

WifiManger wifiManger = (WifiManger)Context.getSystemService(Service.WIFI_SERVICE); //得到系统服务

打开WIFI网卡

wifiManger.setWifiEnabled(true);

打开WIFI网卡

wifiManger.setWifiEnabled(false);

获取网卡当前状态

wifiManger.getWifiState();

android在操作wifi之前需要给app赋予权限：

在AndroidManifest.xml文件中加入红色的代码

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

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

package="com.yx.wificontrol"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="18" />

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name="com.yx.wificontrol.WifiControlActivity"

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>

<!-- 添加wifi网络需要的权限 -->

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

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

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

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

</manifest>

代码比较简单，WifiControlActivity.java文件

package com.yx.wificontrol;

import android.net.wifi.WifiManager;

import android.os.Bundle;

import android.app.Activity;

import android.content.Context;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class WifiControlActivity extends Activity {

private Button startWifi;

private Button stopWifi;

private Button seeWifi;

private WifiManager wifiManager;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_wifi_control);

startWifi = (Button) findViewById(R.id.startWifi);

stopWifi = (Button) findViewById(R.id.stopWifi);

seeWifi = (Button) findViewById(R.id.seeWifi);

startWifi.setOnClickListener(new StartWifiListener());

stopWifi.setOnClickListener(new StopWifiListener());

seeWifi.setOnClickListener(new SeeWifiListener());

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.wifi_control, menu);

return true;

}



class StartWifiListener implements OnClickListener{

@Override

public void onClick(View v) {

System.out.println("StartWifiListener");

//Toast.makeText(WifiControlActivity.this, "当前网卡状态："+wifiManager.getWifiState(), Toast.LENGTH_LONG);

wifiManager = (WifiManager) WifiControlActivity.this.getSystemService(Context.WIFI_SERVICE);

wifiManager.setWifiEnabled(true);

System.out.println("wifi 状态："+wifiManager.getWifiState());

Toast.makeText(WifiControlActivity.this, "当前网卡状态："+wifiManager.getWifiState(), Toast.LENGTH_LONG).show();

}

}



class StopWifiListener implements OnClickListener{

@Override

public void onClick(View v) {

System.out.println("StopWifiListener");

//Toast.makeText(WifiControlActivity.this, "当前网卡状态："+wifiManager.getWifiState(), Toast.LENGTH_SHORT);

wifiManager = (WifiManager) WifiControlActivity.this.getSystemService(Context.WIFI_SERVICE);

wifiManager.setWifiEnabled(false);

System.out.println("wifi 状态："+wifiManager.getWifiState());

Toast.makeText(WifiControlActivity.this, "当前网卡状态："+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();

}

}



class SeeWifiListener implements OnClickListener{

@Override

public void onClick(View v) {

System.out.println("SeeWifiListener");

wifiManager = (WifiManager) WifiControlActivity.this.getSystemService(Context.WIFI_SERVICE);

System.out.println("wifi 状态："+wifiManager.getWifiState());

Toast.makeText(WifiControlActivity.this, "当前网卡状态："+wifiManager.getWifiState(), Toast.LENGTH_LONG).show();



}

}

}

顺便贴出布局文件

<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=".WifiControlActivity" >

<Button

android:id="@+id/startWifi"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="启动wifi网卡" />

<Button

android:id="@+id/stopWifi"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_below="@id/startWifi"

android:text="关闭wifi网卡" />

<Button

android:id="@+id/seeWifi"

android:layout_below="@id/stopWifi"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="查看wifi网卡状态" />

</RelativeLayout>