首先，需要权限
[html]
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
WIF的状态在WifiManager中定义了常量，都是public static final int类型的，如下
[java]
public static final int WIFI_STATE_DISABLED
Wi-Fi is disabled.
Constant Value: 1 (0x00000001)
public static final int WIFI_STATE_DISABLING
Wi-Fi is currently being disabled. The state will change to WIFI_STATE_DISABLED if it finishes successfully.
Constant Value: 0 (0x00000000)
public static final int WIFI_STATE_ENABLED
Wi-Fi is enabled.
Constant Value: 3 (0x00000003)
public static final int WIFI_STATE_ENABLING
Wi-Fi is currently being enabled. The state will change to WIFI_STATE_ENABLED if it finishes successfully.
Constant Value: 2 (0x00000002)
public static final int WIFI_STATE_UNKNOWN
Wi-Fi is in an unknown state. This state will occur when an error happens while enabling or disabling.
Constant Value: 4 (0x00000004)
public static final int WIFI_STATE_DISABLED
Wi-Fi is disabled.
Constant Value: 1 (0x00000001)
public static final int WIFI_STATE_DISABLING
Wi-Fi is currently being disabled. The state will change to WIFI_STATE_DISABLED if it finishes successfully.
Constant Value: 0 (0x00000000)
public static final int WIFI_STATE_ENABLED
Wi-Fi is enabled.
Constant Value: 3 (0x00000003)
public static final int WIFI_STATE_ENABLING
Wi-Fi is currently being enabled. The state will change to WIFI_STATE_ENABLED if it finishes successfully.
Constant Value: 2 (0x00000002)
public static final int WIFI_STATE_UNKNOWN
Wi-Fi is in an unknown state. This state will occur when an error happens while enabling or disabling.
Constant Value: 4 (0x00000004)
定义一个并且初始化WifiManager manager==(WifiManager) Context.getSystemService(Context.WIFI_SERVICE);
启动WIFI manager.setWifiEnabled(true);
关闭WIFI manager.setWifiEnabled(false);
获取WIFI状态 manager.getWifiState();返回前面说的五种状态的一种
下面是全部代码
[java]
package com.zhycheng.wifi;
import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class WIFIDemoActivity extends Activity implements OnClickListener {
Button start,stop,state;
WifiManager manager;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
start=(Button) findViewById(R.id.startWIFI);
stop=(Button) findViewById(R.id.stopWIFI);
state=(Button) findViewById(R.id.getSTATE);
start.setOnClickListener(this);
stop.setOnClickListener(this);
state.setOnClickListener(this);
}
@Override
public void onClick(View v) {
manager=(WifiManager) this.getSystemService(Context.WIFI_SERVICE);
switch(v.getId())
{
case R.id.startWIFI:
manager.setWifiEnabled(true);
System.out.println("当前WIFI状态为"+manager.getWifiState());
Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();
break;
case R.id.stopWIFI:
manager.setWifiEnabled(false);
System.out.println("当前WIFI状态为"+manager.getWifiState());
Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();
break;
case R.id.getSTATE:
System.out.println("当前WIFI状态为"+manager.getWifiState());
Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();
break;
}
}
}
package com.zhycheng.wifi;
import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class WIFIDemoActivity extends Activity implements OnClickListener {
Button start,stop,state;
WifiManager manager;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
start=(Button) findViewById(R.id.startWIFI);
stop=(Button) findViewById(R.id.stopWIFI);
state=(Button) findViewById(R.id.getSTATE);
start.setOnClickListener(this);
stop.setOnClickListener(this);
state.setOnClickListener(this);
}
@Override
public void onClick(View v) {
manager=(WifiManager) this.getSystemService(Context.WIFI_SERVICE);
switch(v.getId())
{
case R.id.startWIFI:
manager.setWifiEnabled(true);
System.out.println("当前WIFI状态为"+manager.getWifiState());
Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();
break;
case R.id.stopWIFI:
manager.setWifiEnabled(false);
System.out.println("当前WIFI状态为"+manager.getWifiState());
Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();
break;
case R.id.getSTATE:
System.out.println("当前WIFI状态为"+manager.getWifiState());
Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();
break;
}
}
}
