Android治理WIFI

首先，需要权限

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

WIF的状态在WifiManager中定义了常量，都是public static final int类型的，如下

public static final int WIFI_STATE_DISABLEDWi-Fi is disabled.Constant Value: 1 (0x00000001)public static final int WIFI_STATE_DISABLINGWi-Fi is currently being disabled. The state will change to WIFI_STATE_DISABLED if it finishes successfully.Constant Value: 0 (0x00000000)public static final int WIFI_STATE_ENABLEDWi-Fi is enabled.Constant Value: 3 (0x00000003)public static final int WIFI_STATE_ENABLINGWi-Fi is currently being enabled. The state will change to WIFI_STATE_ENABLED if it finishes successfully.Constant Value: 2 (0x00000002)public static final int WIFI_STATE_UNKNOWNWi-Fi is in an unknown state. This state will occur when an error happens while enabling or disabling.Constant Value: 4 (0x00000004)

定义一个并且初始化WifiManager manager==(WifiManager) Context.getSystemService(Context.WIFI_SERVICE);

启动WIFI manager.setWifiEnabled(true);

关闭WIFI manager.setWifiEnabled(false);

获取WIFI状态 manager.getWifiState();返回前面说的五种状态的一种

下面是全部代码

package com.zhycheng.wifi;import android.app.Activity;import android.content.Context;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.Toast;public class WIFIDemoActivity extends Activity implements OnClickListener {	Button start,stop,state;	WifiManager manager;		    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        start=(Button) findViewById(R.id.startWIFI);        stop=(Button) findViewById(R.id.stopWIFI);        state=(Button) findViewById(R.id.getSTATE);        start.setOnClickListener(this);        stop.setOnClickListener(this);        state.setOnClickListener(this);    }	@Override	public void onClick(View v) {		manager=(WifiManager) this.getSystemService(Context.WIFI_SERVICE);				switch(v.getId())		{		case R.id.startWIFI:			manager.setWifiEnabled(true);			System.out.println("当前WIFI状态为"+manager.getWifiState());			Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();						break;		case R.id.stopWIFI:			manager.setWifiEnabled(false);			System.out.println("当前WIFI状态为"+manager.getWifiState());			Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();						break;		case R.id.getSTATE:						System.out.println("当前WIFI状态为"+manager.getWifiState());			Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();			break;		}			}}

示例工程下载：点击打开链接