WiFi的使用Demo

先发代码放上来:

package cn.com;

import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

public class WiFiTest extends Activity
{
  private TextView mTextView01;
  private CheckBox mCheckBox01;

  /* 创建WiFiManager对象 */
  private WifiManager mWiFiManager01;

  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    mTextView01 = (TextView) findViewById(R.id.myTextView1);
    mCheckBox01 = (CheckBox) findViewById(R.id.myCheckBox1);

    /* 以getSystemService取得WIFI_SERVICE */
    mWiFiManager01 = (WifiManager)   
    this.getSystemService(Context.WIFI_SERVICE);

    checkWiFiStatus();
    addCheckboxListener();

  }

  public void addCheckboxListener()
  {
    /* 捕捉CheckBox的点击事件 */
    mCheckBox01.setOnClickListener(new CheckBox.OnClickListener()
    {
      public void onClick(View v)
      {
        /* 当选取项为取消选取状态 */
        if (mCheckBox01.isChecked() == false)
        {
          closeWiFiServices();
        } else if (mCheckBox01.isChecked() == true)
        {
          openWiFiServices();
        }
      }
    });
  }

  public void checkWiFiStatus()
  {
    if (mWiFiManager01.isWifiEnabled())
     // 判断手机是否已启用了WiFi功能
    {
      /* 判断WiFi状态是否“已打开” */
      if (mWiFiManager01.getWifiState() ==  
          WifiManager.WIFI_STATE_ENABLED)
      {
        /* 若WiFi已打开，将选取项打勾 */
        mCheckBox01.setChecked(true);
        /* 更改选取项文字为关闭WiFi */
        mCheckBox01.setText(R.string.str_uncheck);
      } else
      {
        /* 若WiFi未打开，将选取项勾选择消 */
        mCheckBox01.setChecked(false);
        /* 更改选取项文字为打开WiFi */
        mCheckBox01.setText(R.string.str_checked);
      }
    } else
    {
      mCheckBox01.setChecked(false);
      mCheckBox01.setText(R.string.str_checked);
    }
  }

  public void mMakeTextToast(String str, boolean isLong)
  {
    if (isLong == true)
    {
      Toast.makeText(EX05_17.this, str, Toast.LENGTH_LONG).show();
    } else
    {
      Toast.makeText(EX05_17.this, str, Toast.LENGTH_SHORT).show();
    }
  }

  public void closeWiFiServices()
  {
    try
    {
      if (mWiFiManager01.isWifiEnabled())
      // 判断WiFi状态是否为已打开
      {
        if (mWiFiManager01.setWifiEnabled(false))// 关闭WiFi
        {
          mTextView01.setText(R.string.str_stop_wifi_done);
        } else
        {
          mTextView01.setText(R.string.str_stop_wifi_failed);
        }
      } else
      {
        switch (mWiFiManager01.getWifiState())
        // WiFi状态不为已打开状态时
        {
          case WifiManager.WIFI_STATE_ENABLING:
          // WiFi正在打开过程中，导致无法关闭...
            mTextView01.setText(getResources().getText(
                R.string.str_stop_wifi_failed)
                + ":" + 
            getResources().getText(R.string.str_wifi_enabling));
            break;
          case WifiManager.WIFI_STATE_DISABLING:
          // WiFi正在关闭过程中，导致无法关闭...
            mTextView01.setText(getResources().getText(
                R.string.str_stop_wifi_failed)
                + ":" + 
            getResources().getText(R.string.str_wifi_disabling));
            break;
          case WifiManager.WIFI_STATE_DISABLED:
           // WiFi已经关闭
            mTextView01.setText(getResources().getText(
                R.string.str_stop_wifi_failed)
                + ":" +  
            getResources().getText(R.string.str_wifi_disabled));
            break;
          case WifiManager.WIFI_STATE_UNKNOWN:
          // 无法取得或辨识WiFi状态
          default:
            mTextView01.setText(getResources().getText(
                R.string.str_stop_wifi_failed)
                + ":" + 
            getResources().getText(R.string.str_wifi_unknow));
            break;
        }
        mCheckBox01.setText(R.string.str_checked);
      }
    } catch (Exception e)
    {
      Log.i("HIPPO", e.toString());
      e.printStackTrace();
    }
  }

  public void openWiFiServices()
  {
    if (!mWiFiManager01.isWifiEnabled()
    // 确认WiFi服务是关闭且不在打开过程中
        && mWiFiManager01.getWifiState() != 
       WifiManager.WIFI_STATE_ENABLING)
    {
      if (mWiFiManager01.setWifiEnabled(true))
      // 启动WiFi服务
      {
        switch (mWiFiManager01.getWifiState())
        {
          case WifiManager.WIFI_STATE_ENABLING:
           // WiFi正在打开过程中....
            mTextView01.setText(getResources().getText(
                R.string.str_wifi_enabling));
            break;
          case WifiManager.WIFI_STATE_ENABLED:
           // WiFi已经打开
            mTextView01.setText(getResources().getText(
                R.string.str_start_wifi_done));
            break;
          default:
            mTextView01.setText(getResources().getText(
                R.string.str_start_wifi_failed)
           // 其它未知的错误
                + ":" + 
            getResources().getText(R.string.str_wifi_unknow));
            break;
        }
      } else
      {
        mTextView01.setText(R.string.str_start_wifi_failed);
      }
    }
  }

}
还有个最重要的环节就是设置各种权限
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