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   源码介绍

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package com.example.wifitestact;

import java.util.List;

import android.app.Activity;
import android.app.AlertDialog.Builder;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

	private Button scan_button;

	private TextView wifi_result_textview;

	private WifiManager wifiManager;

	private WifiInfo currentWifiInfo;// 当前所连接的wifi

	private List<ScanResult> wifiList;// wifi列表

	private String[] str;

	private int wifiIndex;

	private ProgressDialog progressDialog;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
		setupViews();
		initListener();
	}

	@Override
	protected void onResume() {
		openWifi();
		currentWifiInfo = wifiManager.getConnectionInfo();
		wifi_result_textview.setText(
				"当前网络："   currentWifiInfo.getSSID()   " ip:"   WifiUtil.intToIp(currentWifiInfo.getIpAddress()));
		new ScanWifiThread().start();
		super.onResume();
	}

	public void setupViews() {
		scan_button = (Button) findViewById(R.id.scan_button);
		wifi_result_textview = (TextView) findViewById(R.id.wifi_result_textview);

	}

	public void initListener() {
		scan_button.setOnClickListener(this);

	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.scan_button:
			lookUpScan();
			break;
		}
	}

	/**
	 * 打开wifi
	 */
	public void openWifi() {
		if (!wifiManager.isWifiEnabled()) {
			wifiManager.setWifiEnabled(true);
		}
	}

	class ScanWifiThread extends Thread {

		@Override
		public void run() {
			while (true) {
				currentWifiInfo = wifiManager.getConnectionInfo();
				startScan();
				try {
					Thread.sleep(1000);
				} catch (InterruptedException e) {
					break;
				}
			}
		}
	}

	public void startScan() {
		wifiManager.startScan();
		// 获取扫描结果
		wifiList = wifiManager.getScanResults();
		str = new String[wifiList.size()];
		String tempStr = null;
		for (int i = 0; i < wifiList.size(); i  ) {
			tempStr = wifiList.get(i).SSID;
			if (null != currentWifiInfo && tempStr.equals(currentWifiInfo.getSSID())) {
				tempStr = tempStr   "(已连接)";
			}
			str[i] = tempStr;
		}
	}

	public void lookUpScan() {
		Builder builder = new Builder(MainActivity.this);
		builder.setTitle("wifi");
		builder.setItems(str, new DialogInterface.OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				wifiIndex = which;
				handler.sendEmptyMessage(3);
			}
		});
		builder.show();
	}

	class RefreshSsidThread extends Thread {

		@Override
		public void run() {
			boolean flag = true;
			while (flag) {
				currentWifiInfo = wifiManager.getConnectionInfo();
				if (null != currentWifiInfo.getSSID() && 0 != currentWifiInfo.getIpAddress()) {
					flag = false;
				}
			}
			handler.sendEmptyMessage(4);
			super.run();
		}
	}

	/**
	 * 连接网络
	 * 
	 * @param index
	 * @param password
	 */
	public void connetionConfiguration(int index, String password) {
		progressDialog = ProgressDialog.show(MainActivity.this, "正在连接...", "请稍候...");
		new ConnectWifiThread().execute(index   "", password);
	}

	/**
	 * 连接wifi
	 * 
	 * @author passing
	 * 
	 */
	class ConnectWifiThread extends AsyncTask<String, Integer, String> {

		@Override
		protected String doInBackground(String... params) {
			int index = Integer.parseInt(params[0]);
			if (index > wifiList.size()) {
				return null;
			}
			// 连接配置好指定ID的网络
			WifiConfiguration config = WifiUtil.createWifiInfo(wifiList.get(index).SSID, params[1], 3, wifiManager);

			int networkId = wifiManager.addNetwork(config);
			if (null != config) {
				wifiManager.enableNetwork(networkId, true);
				return wifiList.get(index).SSID;
			}
			return null;
		}

		@Override
		protected void onPostExecute(String result) {
			if (null != progressDialog) {
				progressDialog.dismiss();
			}
			if (null != result) {
				handler.sendEmptyMessage(0);
			} else {
				handler.sendEmptyMessage(1);
			}
			super.onPostExecute(result);
		}

	}

	Handler handler = new Handler() {

		@Override
		public void handleMessage(Message msg) {
			switch (msg.what) {
			case 0:
				wifi_result_textview.setText("正在获取ip地址...");
				new RefreshSsidThread().start();
				break;
			case 1:
				Toast.makeText(MainActivity.this, "连接失败！", Toast.LENGTH_SHORT).show();
				break;
			case 3:
				View layout = LayoutInflater.from(MainActivity.this).inflate(R.layout.dialog_password_layout, null);
				Builder builder = new Builder(MainActivity.this);
				builder.setTitle("请输入密码").setView(layout);
				final EditText passowrdText = (EditText) layout.findViewById(R.id.dialog_password_et);
				builder.setPositiveButton("连接", new DialogInterface.OnClickListener() {

					@Override
					public void onClick(DialogInterface dialog, int which) {
						connetionConfiguration(wifiIndex, passowrdText.getText().toString());
					}
				}).show();
				break;
			case 4:
				// Toast.makeText(main.this, "连接成功！", Toast.LENGTH_SHORT)
				// .show();
				wifi_result_textview.setText("当前网络："   currentWifiInfo.getSSID()   " ip:"
						  WifiUtil.intToIp(currentWifiInfo.getIpAddress()));
				break;
			}
			super.handleMessage(msg);
		}

	};

}