控制WIFI状态

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　　1.控制WIFI



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();
}
}

　　
　　2.加入权限



<?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>