WiFi打开与关闭
1.WiFi网卡的状态主要有如下五种状态：
WIFI_STATE_DISABLED: WIFI网卡不可用
WIFI_STATE_DISABLING: WIFI正在关闭
WIFI_STATE_ENABLED: WIFI网卡可用
WIFI_STATE_ENABLED: WIFI网卡正在打开
WIFI_STATE_UNKNOWN: 未知网卡状态
2.Wifi主要通过WiFiManager这个类来进行管理，操作步骤如下：
(1)首先打开WIFI相关的权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
(2)在Context对象中获得WiFiManager对象
WiFiManager wifiManager=(WifiManager)getSystemService(WIFI_SERVICE);
(3) 通过WiFiManager类中的改变WiFi状态的方法，来打开、关闭、查询WiFi的状态
wifiManager.setWifiEnabled(true); //打开WiFiWiFi状态由WIFI_STATE_ENABLED变为WIFI_STATE_ENABLED；
wifiManager.setWifiEnabled(false); //关闭WiFiWiFi状态由WIFI_STATE_DISABLING变为WIFI_STATE_DISABLED;
wifiManager.getWifiState(); //查询WiFi状态
3.源代码如下：
(1)AndroidManifest.xml文件如下：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.haitun.wifi"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="8" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.haitun.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>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
</manifest>
(2)Java源代码
package com.haitun.wifi;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
public class MainActivity extends Activity {
private final static int START=1;
private final static int STOP=2;
private final static int CHECK=3;
private WifiManager wifiManager=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
//增加菜单按钮
menu.add(0,START, 1, "打开WiFi");
menu.add(0, STOP, 2, "关闭WiFi");
menu.add(0, CHECK, 3, "检查WiFi状态");
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
//打开WiFi
if(item.getItemId()==START){
wifiManager=(WifiManager)getSystemService(WIFI_SERVICE);
wifiManager.setWifiEnabled(true);
Toast.makeText(this, "当前无线网卡的状态为："+wifiManager.getWifiState()+"~", Toast.LENGTH_SHORT).show();
}
//关闭WiFi
else if(item.getItemId()==STOP){
wifiManager=(WifiManager)getSystemService(WIFI_SERVICE);
wifiManager.setWifiEnabled(false);
Toast.makeText(this, "当前无线网卡的状态为："+wifiManager.getWifiState()+"~", Toast.LENGTH_SHORT).show();
}
//查询WiFi
else if(item.getItemId()==CHECK){
int state;
state=wifiManager.getWifiState();
Toast.makeText(this, "当前无线网卡的状态为："+state+"~", Toast.LENGTH_SHORT).show();
}
return super.onOptionsItemSelected(item);
}
}
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