控制WIFI状态

public class MainActivity extends Activity {

    private Button startButton = null;

    private Button stopButton = null;

    private Button checkButton = null;

    private WifiManager wifiManager = null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        startButton = (Button)findViewById(R.id.startWifi);

        stopButton = (Button)findViewById(R.id.stopWifi);

        checkButton = (Button)findViewById(R.id.checkWifi);

        startButton.setOnClickListener(new StartWifiListener());

        stopButton.setOnClickListener(new StopWifiListener());

        checkButton.setOnClickListener(new CheckWifiListener());

        /*if (savedInstanceState == null) {

            getSupportFragmentManager().beginTransaction()

                    .add(R.id.container, new PlaceholderFragment()).commit();

        }*/

    }

    class StartWifiListener implements OnClickListener{

        @Override

        public void onClick(View v) {

            wifiManager = (WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);

            wifiManager.setWifiEnabled(true);

            System.out.println("wifi state --->" + wifiManager.getWifiState());

            Toast.makeText(MainActivity.this, "当前Wifi网卡状态为" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();

        }

    }

    class StopWifiListener implements OnClickListener{

        @Override

        public void onClick(View arg0) {

            // TODO Auto-generated method stub

            wifiManager = (WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);

            wifiManager.setWifiEnabled(false);

            System.out.println("wifi state --->" + wifiManager.getWifiState());

            Toast.makeText(MainActivity.this, "当前Wifi网卡状态为" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();

        }

    }

    class CheckWifiListener implements OnClickListener{

        @Override

        public void onClick(View v) {

            wifiManager = (WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);

            System.out.println("wifi state --->" + wifiManager.getWifiState());

            Toast.makeText(MainActivity.this, "当前Wifi网卡状态为" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();

        }

    }

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.mars_1900_wifi"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="19" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.example.mars_1900_wifi.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

    <!-- 以下是使用wifi访问网络所需要的权限 -->

    <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>

</manifest>