Android学习笔记-Wifi网络操作

Wifi网卡状态
WIFI_STATE_DISABLED Wifi网卡不可用

WIFI_STATE_DIABLING Wifi网卡正在关闭

WIFI_STATE_ENABLED Wifi网卡可用

WIFI_STATE_ENABLING Wifi网卡正在打开

WIFI_STATE_UNKNOWN 未知网卡状态

操作Wifi网卡所需要的权限
CHANGE_NETWORK_STATE 改变网络连接状态

CHANGE_WIFI_STATE 改变Wifi连接状态

ACCESS_NETWORK_STATE 允许应用获取网络状态信息

ACCESS_WIFI_STATE 允许应用获取Wifi状态信息

界面activity_main.xml

<TextView
android:id="@+id/hello"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

<Button
android:id="@+id/startWifi"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/hello"
android:text="启动手机的wifi网卡"
/>
<Button
android:id="@+id/stopWifi"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/startWifi"
android:text="关闭手机的wifi网卡"
/>
<Button
android:id="@+id/checkWifi"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/stopWifi"
android:text="检查当前wifi网卡状态"
/>

需要的权限

<!-- 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>

MainActivity.java

public class MainActivity extends Activity {
private Button startButton = null;
private Button stopButton = null;
private Button checkButton = null;
private WifiManager wifiManager = null;
@Override
public 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());
}
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());
/*
getWifiState返回下面五个常量之一
下面的五个常量都是在WifiManager类中预定义的
public static final int WIFI_STATE_DISABLING = 0;
public static final int WIFI_STATE_DISABLED = 1;
public static final int WIFI_STATE_ENABLING = 2;
public static final int WIFI_STATE_ENABLED = 3;
public static final int WIFI_STATE_UNKNOWN = 4;
*/
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();
}

}
}

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