Wifi网络状态操作

ゝ一世哀愁。 2024-02-17 22:41 50阅读 0赞

### 1 WIFI网卡状态 ###

wifi网卡的状态是由一系列的整型常量来表示的：

WIFI\_STATE\_DISABLED: WIFI网卡不可用

WIFI\_STATE\_DISABLING: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

### 2 需要的权限 ###

![Center][]

### 3 实现方法 ###

![Center 1][]

### 4 示例 ###

**Wifi.java：**

package com.example.wifi;
    
    import android.net.wifi.WifiManager;
    import android.os.Bundle;
    import android.app.Activity;
    import android.content.Context;
    import android.view.Menu;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.Toast;
    
    public class MainActivity extends Activity {
    
    	
    	Button startbtn, stopbtn, checkbtn;
    	WifiManager wifimanager;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            
            startbtn = (Button) findViewById(R.id.startbtn);
            stopbtn = (Button) findViewById(R.id.stopbtn);
            checkbtn = (Button) findViewById(R.id.checkbtn);
            
            startbtn.setOnClickListener(new StartWifiListener());
            stopbtn.setOnClickListener(new StopWifiListener());
            checkbtn.setOnClickListener(new CheckWifiListener());
            
        }
        
        class StartWifiListener implements OnClickListener {
    		@Override
    		public void onClick(View v) {
    			// TODO Auto-generated method stub
    			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_LONG).show();
    		}
        }
        class StopWifiListener implements OnClickListener {
    		@Override
    		public void onClick(View v) {
    			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_LONG).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_LONG).show();
    		}
        }
    }

**manifest.xml:**

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.wifi"
        android:versionCode="1"
        android:versionName="1.0" >
    
        <uses-sdk
            android:minSdkVersion="8"
            android:targetSdkVersion="18" />
    
          
        <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
        <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
        <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
        
        <application
            android:allowBackup="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:theme="@style/AppTheme" >
            <activity
                android:name="com.example.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>
        
    </manifest>

[Center]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/2dac4566482d4bdfa73b55bb2f8dc0cb.png
[Center 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/27ac637e34c34828be41ce7fab009d04.png