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  • Android的WiFi开启与关闭

    注意:要首先注册开启和关闭WiFi的权限,

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.wyl.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.wyl.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>
        <!-- 注册WiFi的权限 -->
    	<uses-permission android:name="android.permission.ACCESS_WIFI_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.CHANGE_NETWORK_STATE"></uses-permission>
    </manifest>
    

      MainActivity.java

    package com.wyl.wifi;
    
    import android.content.Context;
    import android.database.sqlite.SQLiteOpenHelper;
    import android.net.wifi.WifiManager;
    import android.os.Bundle;
    import android.support.v7.app.ActionBarActivity;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
    import android.widget.Toast;
    
    public class MainActivity extends ActionBarActivity {
    	Button btn;
    	Button btn2;
    	Button btn3;
    	TextView tv;
    	EditText et;
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    		btn = (Button) findViewById(R.id.btn01);// 检查网卡
    		btn2 = (Button) findViewById(R.id.btn02);// 开启网卡
    		btn3 = (Button) findViewById(R.id.btn03);// 关闭网卡
    		et = (EditText)findViewById(R.id.editText2);
    		StartWifiListener start = new StartWifiListener();
    		CloseWifiListener close = new CloseWifiListener();
    		btn2.setOnClickListener(start);
    		btn3.setOnClickListener(close);
    	}
    	
    	class StartWifiListener implements OnClickListener{
    
    		@Override
    		public void onClick(View v) {
    			//最重要的就是先获取到WifiManager
    			WifiManager wifiman = (WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);
    			wifiman.setWifiEnabled(true);//开启WiFi
    			System.out.println("wifi state --->"+wifiman.getWifiState());
    			Toast.makeText(MainActivity.this, ""+wifiman.getWifiState(), Toast.LENGTH_LONG);
    		}
    		
    	}
    	class CloseWifiListener implements OnClickListener{
    
    		@Override
    		public void onClick(View v) {
    			WifiManager wifiman = (WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);
    			wifiman.setWifiEnabled(false);//关闭WiFi
    			System.out.println("wifi state --->"+wifiman.getWifiState());
    			Toast.makeText(MainActivity.this, ""+wifiman.getWifiState(), Toast.LENGTH_LONG);
    		}
    		
    	}
    	
    	
    }
    

      

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  • 原文地址:https://www.cnblogs.com/Sunnor/p/4690023.html
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