Android 连接Wifi和创建Wifi热点的实例

本文实例讲述了连接Wifi和创建Wifi热点的方法。分享给大家供大家参考，具体如下：

android的热点功能不可见，用了反射的技术搞定之外。

Eclipse设置语言为utf-8才能查看中文注释

上代码：

MainActivity.java

package com.widget.hotspot;
import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button; 

public class MainActivity extends Activity { 

  public static final String TAG = "MainActivity"; 

  private Button mBtn1, mBtn2; 

  private WifiAdmin mWifiAdmin; 

  private Context mContext = null;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); 

    mContext = this; 

    setContentView(R.layout.activity_main); 

    mBtn1 = (Button)findViewById(R.id.button1);
    mBtn2 = (Button)findViewById(R.id.button2);
    mBtn1.setText("点击连接Wifi");
    mBtn2.setText("点击创建Wifi热点");
    mBtn1.setOnClickListener(new Button.OnClickListener() { 

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub 

        mWifiAdmin = new WifiAdmin(mContext) { 

          @Override
          public void myUnregisterReceiver(BroadcastReceiver receiver) {
            // TODO Auto-generated method stub
            MainActivity.this.unregisterReceiver(receiver);
          } 

          @Override
          public Intent myRegisterReceiver(BroadcastReceiver receiver,
              IntentFilter filter) {
            // TODO Auto-generated method stub
            MainActivity.this.registerReceiver(receiver, filter);
            return null;
          } 

          @Override
          public void onNotifyWifiConnected() {
            // TODO Auto-generated method stub
            Log.v(TAG, "have connected success!");
            Log.v(TAG, "###############################");
          } 

          @Override
          public void onNotifyWifiConnectFailed() {
            // TODO Auto-generated method stub
            Log.v(TAG, "have connected failed!");
            Log.v(TAG, "###############################");
          }
        };
        mWifiAdmin.openWifi();
        mWifiAdmin.addNetwork(mWifiAdmin.createWifiInfo("YOU_WIFI", "MM123456", WifiAdmin.TYPE_WPA)); 

      }
    }); 

    mBtn2.setOnClickListener(new Button.OnClickListener() { 

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub 

        WifiApAdmin wifiAp = new WifiApAdmin(mContext);
        wifiAp.startWifiAp("\"HotSpot\"", "hhhhhh123");
      }
    }); 

  } 

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
  } 

   @Override
    public void onResume() {
      super.onResume(); 

      Log.d("Rssi", "Registered");
    } 

    @Override
    public void onPause() {
      super.onPause(); 

      Log.d("Rssi", "Unregistered");
    } 

}

WifiAdmin.java

package com.widget.hotspot;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.NetworkInfo.DetailedState;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.WifiLock;
import android.util.Log; 

public abstract class WifiAdmin { 

  private static final String TAG = "WifiAdmin"; 

  private WifiManager mWifiManager;
  private WifiInfo mWifiInfo;
  // 扫描出的网络连接列表
  private List<ScanResult> mWifiList;
  private List<WifiConfiguration> mWifiConfiguration; 

  private WifiLock mWifiLock; 

  private String mPasswd = "";
  private String mSSID = ""; 

  private Context mContext = null; 

  public WifiAdmin(Context context) { 

    mContext = context; 

    // 取得WifiManager对象
    mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    // 取得WifiInfo对象
    mWifiInfo = mWifiManager.getConnectionInfo(); 

    Log.v(TAG, "getIpAddress = " + mWifiInfo.getIpAddress());
  } 

  // 打开WIFI
  public void openWifi() {
    if (!mWifiManager.isWifiEnabled()) {
      mWifiManager.setWifiEnabled(true);
    }
  } 

  // 关闭WIFI
  public void closeWifi() {
    if (mWifiManager.isWifiEnabled()) {
      mWifiManager.setWifiEnabled(false);
    }
  } 

  public abstract Intent myRegisterReceiver(BroadcastReceiver receiver, IntentFilter filter); 

  public abstract void myUnregisterReceiver(BroadcastReceiver receiver); 

  public abstract void onNotifyWifiConnected(); 

  public abstract void onNotifyWifiConnectFailed(); 

  // 添加一个网络并连接
  public void addNetwork(WifiConfiguration wcg) { 

    register(); 

    WifiApAdmin.closeWifiAp(mContext); 

    int wcgID = mWifiManager.addNetwork(wcg);
    boolean b = mWifiManager.enableNetwork(wcgID, true);
  } 

  public static final int TYPE_NO_PASSWD = 0x11;
  public static final int TYPE_WEP = 0x12;
  public static final int TYPE_WPA = 0x13; 

  public void addNetwork(String ssid, String passwd, int type) {
    if (ssid == null || passwd == null || ssid.equals("")) {
      Log.e(TAG, "addNetwork() ## nullpointer error!");
      return;
    } 

    if (type != TYPE_NO_PASSWD && type != TYPE_WEP && type != TYPE_WPA) {
      Log.e(TAG, "addNetwork() ## unknown type = " + type);
    } 

    stopTimer();
    unRegister(); 

    addNetwork(createWifiInfo(ssid, passwd, type));
  } 

  private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() { 

    @Override
    public void onReceive(Context context, Intent intent) {
      // TODO Auto-generated method stub
      if (intent.getAction().equals(WifiManager.RSSI_CHANGED_ACTION)) {
        Log.d(TAG, "RSSI changed"); 

        //有可能是正在获取，或者已经获取了
        Log.d(TAG, " intent is " + WifiManager.RSSI_CHANGED_ACTION); 

        if (isWifiContected(mContext) == WIFI_CONNECTED) {
          stopTimer();
          onNotifyWifiConnected();
          unRegister();
        } else if (isWifiContected(mContext) == WIFI_CONNECT_FAILED) {
          stopTimer();
          closeWifi();
          onNotifyWifiConnectFailed();
          unRegister();
        } else if (isWifiContected(mContext) == WIFI_CONNECTING) { 

        }
      }
    }
  }; 

  private final int STATE_REGISTRING = 0x01;
  private final int STATE_REGISTERED = 0x02;
  private final int STATE_UNREGISTERING = 0x03;
  private final int STATE_UNREGISTERED = 0x04; 

  private int mHaveRegister = STATE_UNREGISTERED;
  private synchronized void register() {
    Log.v(TAG, "register() ##mHaveRegister = " + mHaveRegister); 

    if (mHaveRegister == STATE_REGISTRING
        || mHaveRegister == STATE_REGISTERED) {
      return ;
    } 

    mHaveRegister = STATE_REGISTRING;
    myRegisterReceiver(mBroadcastReceiver, new IntentFilter(WifiManager.RSSI_CHANGED_ACTION));
    mHaveRegister = STATE_REGISTERED; 

    startTimer();
  } 

  private synchronized void unRegister() {
    Log.v(TAG, "unRegister() ##mHaveRegister = " + mHaveRegister); 

    if (mHaveRegister == STATE_UNREGISTERED
        || mHaveRegister == STATE_UNREGISTERING) {
      return ;
    } 

    mHaveRegister = STATE_UNREGISTERING;
    myUnregisterReceiver(mBroadcastReceiver);
    mHaveRegister = STATE_UNREGISTERED;
  } 

  private Timer mTimer = null;
  private void startTimer() {
    if (mTimer != null) {
      stopTimer();
    } 

    mTimer = new Timer(true);
//   mTimer.schedule(mTimerTask, 0, 20 * 1000);// 20s
    mTimer.schedule(mTimerTask, 30 * 1000);
  } 

  private TimerTask mTimerTask = new TimerTask() { 

    @Override
    public void run() {
      // TODO Auto-generated method stub
      Log.e(TAG, "timer out!");
      onNotifyWifiConnectFailed();
      unRegister();
    }
  }; 

  private void stopTimer() {
    if (mTimer != null) {
      mTimer.cancel();
      mTimer = null;
    }
  } 

  @Override
  protected void finalize() {
    try {
      super.finalize();
      unRegister();
    } catch (Throwable e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  } 

  public WifiConfiguration createWifiInfo(String SSID, String password, int type) { 

    Log.v(TAG, "SSID = " + SSID + "## Password = " + password + "## Type = " + type); 

    WifiConfiguration config = new WifiConfiguration();
    config.allowedAuthAlgorithms.clear();
    config.allowedGroupCiphers.clear();
    config.allowedKeyManagement.clear();
    config.allowedPairwiseCiphers.clear();
    config.allowedProtocols.clear();
    config.SSID = "\"" + SSID + "\""; 

    WifiConfiguration tempConfig = this.IsExsits(SSID);
    if (tempConfig != null) {
      mWifiManager.removeNetwork(tempConfig.networkId);
    } 

    // 分为三种情况：1没有密码2用wep加密3用wpa加密
    if (type == TYPE_NO_PASSWD) {// WIFICIPHER_NOPASS
      config.wepKeys[0] = "";
      config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
      config.wepTxKeyIndex = 0; 

    } else if (type == TYPE_WEP) { // WIFICIPHER_WEP
      config.hiddenSSID = true;
      config.wepKeys[0] = "\"" + password + "\"";
      config.allowedAuthAlgorithms
          .set(WifiConfiguration.AuthAlgorithm.SHARED);
      config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
      config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
      config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
      config.allowedGroupCiphers
          .set(WifiConfiguration.GroupCipher.WEP104);
      config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
      config.wepTxKeyIndex = 0;
    } else if (type == TYPE_WPA) {  // WIFICIPHER_WPA
      config.preSharedKey = "\"" + password + "\"";
      config.hiddenSSID = true;
      config.allowedAuthAlgorithms
          .set(WifiConfiguration.AuthAlgorithm.OPEN);
      config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
      config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
      config.allowedPairwiseCiphers
          .set(WifiConfiguration.PairwiseCipher.TKIP);
      // config.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
      config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
      config.allowedPairwiseCiphers
          .set(WifiConfiguration.PairwiseCipher.CCMP);
      config.status = WifiConfiguration.Status.ENABLED;
    }  

    return config;
  } 

  public static final int WIFI_CONNECTED = 0x01;
  public static final int WIFI_CONNECT_FAILED = 0x02;
  public static final int WIFI_CONNECTING = 0x03;
  /**
   * 判断wifi是否连接成功,不是network
   *
   * @param context
   * @return
   */
  public int isWifiContected(Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context
        .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo wifiNetworkInfo = connectivityManager
        .getNetworkInfo(ConnectivityManager.TYPE_WIFI); 

    Log.v(TAG, "isConnectedOrConnecting = " + wifiNetworkInfo.isConnectedOrConnecting());
    Log.d(TAG, "wifiNetworkInfo.getDetailedState() = " + wifiNetworkInfo.getDetailedState());
    if (wifiNetworkInfo.getDetailedState() == DetailedState.OBTAINING_IPADDR
        || wifiNetworkInfo.getDetailedState() == DetailedState.CONNECTING) {
      return WIFI_CONNECTING;
    } else if (wifiNetworkInfo.getDetailedState() == DetailedState.CONNECTED) {
      return WIFI_CONNECTED;
    } else {
      Log.d(TAG, "getDetailedState() == " + wifiNetworkInfo.getDetailedState());
      return WIFI_CONNECT_FAILED;
    }
  } 

  private WifiConfiguration IsExsits(String SSID) {
    List<WifiConfiguration> existingConfigs = mWifiManager.getConfiguredNetworks();
    for (WifiConfiguration existingConfig : existingConfigs) {
      if (existingConfig.SSID.equals("\"" + SSID + "\"") /*&& existingConfig.preSharedKey.equals("\"" + password + "\"")*/) {
        return existingConfig;
      }
    }
    return null;
  } 

  // 断开指定ID的网络
  public void disconnectWifi(int netId) {
    mWifiManager.disableNetwork(netId);
    mWifiManager.disconnect();
  } 

  // 检查当前WIFI状态
  public int checkState() {
    return mWifiManager.getWifiState();
  } 

  // 锁定WifiLock
  public void acquireWifiLock() {
    mWifiLock.acquire();
  } 

  // 解锁WifiLock
  public void releaseWifiLock() {
    // 判断时候锁定
    if (mWifiLock.isHeld()) {
      mWifiLock.acquire();
    }
  } 

  // 创建一个WifiLock
  public void creatWifiLock() {
    mWifiLock = mWifiManager.createWifiLock("Test");
  } 

  // 得到配置好的网络
  public List<WifiConfiguration> getConfiguration() {
    return mWifiConfiguration;
  } 

  // 指定配置好的网络进行连接
  public void connectConfiguration(int index) {
    // 索引大于配置好的网络索引返回
    if (index > mWifiConfiguration.size()) {
      return;
    }
    // 连接配置好的指定ID的网络
    mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId,
        true);
  } 

  public void startScan() {
    mWifiManager.startScan();
    mWifiList = mWifiManager.getScanResults();
    mWifiConfiguration = mWifiManager.getConfiguredNetworks();
  } 

  // 得到网络列表
  public List<ScanResult> getWifiList() {
    return mWifiList;
  } 

  // 查看扫描结果
  public StringBuilder lookUpScan() {
    StringBuilder stringBuilder = new StringBuilder();
    for (int i = 0; i < mWifiList.size(); i++) {
      stringBuilder
          .append("Index_" + new Integer(i + 1).toString() + ":");
      // 将ScanResult信息转换成一个字符串包
      // 其中把包括：BSSID、SSID、capabilities、frequency、level
      stringBuilder.append((mWifiList.get(i)).toString());
      stringBuilder.append("/n");
    }
    return stringBuilder;
  } 

  // 得到MAC地址
  public String getMacAddress() {
    return (mWifiInfo == null) ? "NULL" : mWifiInfo.getMacAddress();
  } 

  // 得到接入点的BSSID
  public String getBSSID() {
    return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID();
  } 

  // 得到IP地址
  public int getIPAddress() {
    return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress();
  } 

  // 得到连接的ID
  public int getNetworkId() {
    return (mWifiInfo == null) ? 0 : mWifiInfo.getNetworkId();
  } 

  // 得到WifiInfo的所有信息包
  public String getWifiInfo() {
    return (mWifiInfo == null) ? "NULL" : mWifiInfo.toString();
  }
}

WifiApAdmin.java

package com.widget.hotspot; 

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Timer;
import java.util.TimerTask; 

import android.content.Context;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.util.Log; 

/**
 * 创建热点
 *
 */
public class WifiApAdmin {
  public static final String TAG = "WifiApAdmin"; 

  public static void closeWifiAp(Context context) {
    WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    closeWifiAp(wifiManager);
  } 

  private WifiManager mWifiManager = null; 

  private Context mContext = null;
  public WifiApAdmin(Context context) {
    mContext = context; 

    mWifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);  

    closeWifiAp(mWifiManager);
  } 

  private String mSSID = "";
  private String mPasswd = "";
  public void startWifiAp(String ssid, String passwd) {
    mSSID = ssid;
    mPasswd = passwd; 

    if (mWifiManager.isWifiEnabled()) {
      mWifiManager.setWifiEnabled(false);
    }  

    stratWifiAp(); 

    MyTimerCheck timerCheck = new MyTimerCheck() { 

      @Override
      public void doTimerCheckWork() {
        // TODO Auto-generated method stub 

        if (isWifiApEnabled(mWifiManager)) {
          Log.v(TAG, "Wifi enabled success!");
          this.exit();
        } else {
          Log.v(TAG, "Wifi enabled failed!");
        }
      } 

      @Override
      public void doTimeOutWork() {
        // TODO Auto-generated method stub
        this.exit();
      }
    };
    timerCheck.start(15, 1000); 

  } 

  public void stratWifiAp() {
    Method method1 = null;
    try {
      method1 = mWifiManager.getClass().getMethod("setWifiApEnabled",
          WifiConfiguration.class, boolean.class);
      WifiConfiguration netConfig = new WifiConfiguration(); 

      netConfig.SSID = mSSID;
      netConfig.preSharedKey = mPasswd; 

      netConfig.allowedAuthAlgorithms
          .set(WifiConfiguration.AuthAlgorithm.OPEN);
      netConfig.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
      netConfig.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
      netConfig.allowedKeyManagement
          .set(WifiConfiguration.KeyMgmt.WPA_PSK);
      netConfig.allowedPairwiseCiphers
          .set(WifiConfiguration.PairwiseCipher.CCMP);
      netConfig.allowedPairwiseCiphers
          .set(WifiConfiguration.PairwiseCipher.TKIP);
      netConfig.allowedGroupCiphers
          .set(WifiConfiguration.GroupCipher.CCMP);
      netConfig.allowedGroupCiphers
          .set(WifiConfiguration.GroupCipher.TKIP); 

      method1.invoke(mWifiManager, netConfig, true); 

    } catch (IllegalArgumentException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IllegalAccessException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (InvocationTargetException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (SecurityException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (NoSuchMethodException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  } 

  private static void closeWifiAp(WifiManager wifiManager) {
    if (isWifiApEnabled(wifiManager)) {
      try {
        Method method = wifiManager.getClass().getMethod("getWifiApConfiguration");
        method.setAccessible(true); 

        WifiConfiguration config = (WifiConfiguration) method.invoke(wifiManager); 

        Method method2 = wifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
        method2.invoke(wifiManager, config, false);
      } catch (NoSuchMethodException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (IllegalArgumentException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (IllegalAccessException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (InvocationTargetException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
  } 

  private static boolean isWifiApEnabled(WifiManager wifiManager) {
    try {
      Method method = wifiManager.getClass().getMethod("isWifiApEnabled");
      method.setAccessible(true);
      return (Boolean) method.invoke(wifiManager); 

    } catch (NoSuchMethodException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (Exception e) {
      e.printStackTrace();
    } 

    return false;
  } 

}

MyTimeCheck.java

package com.widget.hotspot;
public abstract class MyTimerCheck {
  private int mCount = 0;
  private int mTimeOutCount = 1;
  private int mSleepTime = 1000; // 1s
  private boolean mExitFlag = false;
  private Thread mThread = null; 

  /**
   * Do not process UI work in this.
   */
  public abstract void doTimerCheckWork(); 

  public abstract void doTimeOutWork(); 

  public MyTimerCheck() {
    mThread = new Thread(new Runnable() { 

      @Override
      public void run() {
        // TODO Auto-generated method stub
        while (!mExitFlag) {
          mCount++;
          if (mCount < mTimeOutCount) {
            doTimerCheckWork();
            try {
              mThread.sleep(mSleepTime);
            } catch (InterruptedException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
              exit();
            }
          } else {
            doTimeOutWork();
          }
        }
      }
    });
  } 

  /**
   * start
   * @param times How many times will check?
   * @param sleepTime ms, Every check sleep time.
   */
  public void start(int timeOutCount, int sleepTime) {
    mTimeOutCount = timeOutCount;
    mSleepTime = sleepTime; 

    mThread.start();
  } 

  public void exit() {
    mExitFlag = true;
  } 

}

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