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   源码介绍

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package com.example.xu;

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.ConnectivityManager;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
	protected static final String TAG = "MainActivity";
	private WifiManager mWifiManager;
	private Button mbtn, openWifi, closeWifi;
	private List<ScanResult> mScanResults;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		registerBroadcast();
		mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
		mbtn = (Button) findViewById(R.id.button1);
		openWifi = (Button) findViewById(R.id.open_wifi);
		closeWifi = (Button) findViewById(R.id.close_wifi);
		mbtn.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {

			}
		});

		openWifi.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				mWifiManager.setWifiEnabled(true);
				Log.d(TAG, "开启"   DateUtils.getCurrentDateString());
				mWifiManager.startScan();
			}
		});

		closeWifi.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				mWifiManager.setWifiEnabled(false);
				Log.d(TAG, "关闭"   DateUtils.getCurrentDateString());
			}
		});
	}

	private void registerBroadcast() {
		IntentFilter filter = new IntentFilter();
		filter.setPriority(2147483647);
		filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
		filter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
		filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
		filter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
		filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
		registerReceiver(mReceiver, filter);
	}

	/**
	 * 广播接收，监听网络
	 */
	private BroadcastReceiver mReceiver = new BroadcastReceiver() {

		@Override
		public void onReceive(Context context, Intent intent) {
			final String action = intent.getAction();
			// 该扫描已成功完成。
			if (action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
				Log.d(TAG, "接收到"  DateUtils.getCurrentDateString());
				mScanResults = mWifiManager.getScanResults();
				Log.d(TAG, "mScanResults.size()==="   mScanResults.size());

			} else if (intent.getAction().equals(
					WifiManager.WIFI_STATE_CHANGED_ACTION)) {
				int wifiState = intent.getIntExtra(
						WifiManager.EXTRA_WIFI_STATE, 0);
				switch (wifiState) {
				case WifiManager.WIFI_STATE_ENABLED:
					Log.d(TAG, "Wi-Fi已启用。"   DateUtils.getCurrentTime());
					mWifiManager.startScan();
//					refreshWifiStatusOnTime();
					break;
				case WifiManager.WIFI_STATE_DISABLED:
					Log.d(TAG, "Wifi已关闭"   DateUtils.getCurrentTime());
					break;
				}
			}
		}
	};
	
	protected boolean isUpdate = true;
	/**
	 * 定时刷新Wifi列表信息
	 * @author Xiho
	 */
	private void refreshWifiStatusOnTime() {
		mWifiManager.startScan();
		new Thread() {
			public void run() {
				while (isUpdate) {
					mScanResults = mWifiManager.getScanResults();
					Log.d(TAG, "循环 mResults.size=" mScanResults.size());
					if( mScanResults!=null&&mScanResults.size()>0 ){ 
						isUpdate = false;
						Log.d(TAG, "循环size>0,mResults.size=" mScanResults.size());
					}
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		}.start();
	}

}