android代码设置、打开WLAN wifi热点及热点的连接

其实创建热点很简单，先获取到wifi的服务，再配置热点名称、密码等等，然后再通过反射打开它就OK了。

下面我们看看创建热点的代码实现：

这一段是开启WLAN热点，并可以指定好它的热点名和密码

支行后，这一段程序可以开启WLAN和同时自动关闭WIFI。

package com.tel.lajoin.wifi.hotspot;

import java.lang.reflect.Method;

import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class HotspotActivity extends Activity {
	private WifiManager wifiManager;
	private Button open;
	private boolean flag=false;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		//获取wifi管理服务
		wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
		open=(Button)findViewById(R.id.open_hotspot);
		//通过按钮事件设置热点
		open.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				//如果是打开状态就关闭，如果是关闭就打开
				flag=!flag;
				setWifiApEnabled(flag);
			}
		});
	}

	// wifi热点开关
	public boolean setWifiApEnabled(boolean enabled) {
		if (enabled) { // disable WiFi in any case
			//wifi和热点不能同时打开，所以打开热点的时候需要关闭wifi
			wifiManager.setWifiEnabled(false);
		}
		try {
			//热点的配置类
			WifiConfiguration apConfig = new WifiConfiguration();
			//配置热点的名称(可以在名字后面加点随机数什么的)
			apConfig.SSID = "YRCCONNECTION";
			//配置热点的密码
			apConfig.preSharedKey="12122112";
     			//通过反射调用设置热点
			Method method = wifiManager.getClass().getMethod(
					"setWifiApEnabled", WifiConfiguration.class, Boolean.TYPE);
			//返回热点打开状态
			return (Boolean) method.invoke(wifiManager, apConfig, enabled);
		} catch (Exception e) {
			return false;
		}
	}
}

下在一段是，去连一个WLAN热点

package com.tel.lajoin.wifiscan;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.Bundle;

public class MainActivity extends Activity {
	private List<ScanResult> wifiList;
	private WifiManager wifiManager;
	private List<String> passableHotsPot;
	private WifiReceiver wifiReceiver;
	private boolean isConnected=false;
	private Button connect;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		init();
	}

	/* 初始化参数 */
	public void init() {
		setContentView(R.layout.main);
		connect=(Button)findViewById(R.id.connect);
		wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
		wifiReceiver = new WifiReceiver();
		//通过按钮事件搜索热点
		connect.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				wifiManager.startScan();
			}
		});
	}

	/* 监听热点变化 */
	private final class WifiReceiver extends BroadcastReceiver {
		@Override
		public void onReceive(Context context, Intent intent) {
			wifiList = wifiManager.getScanResults();
			if (wifiList == null || wifiList.size() == 0 || isConnected)
				return;
			onReceiveNewNetworks(wifiList);
		}
	}

	/*当搜索到新的wifi热点时判断该热点是否符合规格*/
	public void onReceiveNewNetworks(List<ScanResult> wifiList){
		passableHotsPot=new ArrayList<String>();
		for(ScanResult result:wifiList){
			System.out.println(result.SSID);
			if((result.SSID).contains("YRCCONNECTION"))
				passableHotsPot.add(result.SSID);
		}
		synchronized (this) {
			connectToHotpot();
		}
	}

	/*连接到热点*/
	public void connectToHotpot(){
		if(passableHotsPot==null || passableHotsPot.size()==0)
			return;
		WifiConfiguration wifiConfig=this.setWifiParams(passableHotsPot.get(0));
		int wcgID = wifiManager.addNetwork(wifiConfig);
	    boolean flag=wifiManager.enableNetwork(wcgID, true);
	    isConnected=flag;
		System.out.println("connect success? "+flag);
	}

	/*设置要连接的热点的参数*/
	public WifiConfiguration setWifiParams(String ssid){
		WifiConfiguration apConfig=new WifiConfiguration();
		apConfig.SSID="\""+ssid+"\"";
		apConfig.preSharedKey="\"12122112\"";
		apConfig.hiddenSSID = true;
		apConfig.status = WifiConfiguration.Status.ENABLED;
		apConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
		apConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
		apConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
		apConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
		apConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
		apConfig.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
		return apConfig;
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		/*销毁时注销广播*/
		unregisterReceiver(wifiReceiver);
	}
}

当然，如果要运行起来，还要在MANIFEST.XML中设定好定义的ACTIVITY类。以及相应的LAYOUT文件和R文件的生成。

还有配置权限。

<uses-permission android:name="android.permission.INTERNET"></uses-permission>
	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" ></uses-permission>"
	<!-- 设置允许改变配置信息的权??-->
    <uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />  

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