WiFi控制器

一、添加权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.yxp.android_wifi" >
    <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="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".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>

二、编写布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
    android:orientation="vertical">

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello"
        />
    <Button
        android:id="@+id/startButton"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:text="打开WIFI网卡"
        />
    <Button
        android:id="@+id/stopButton"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:text="关闭WIFI网卡"
        />
    <Button
        android:id="@+id/checkButton"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:text="检查WIFI网卡状态"
        />

</LinearLayout>

三、修改MainActivity文件

package com.example.yxp.android_wifi;



import android.view.Menu;
import android.view.MenuItem;
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 MainActivity extends Activity {
    private Button startButton=null;
    private Button stopButton=null;
    private Button checkButton=null;
    WifiManager wifiManager=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startButton=(Button)findViewById(R.id.startButton);
        stopButton=(Button)findViewById(R.id.stopButton);
        checkButton=(Button)findViewById(R.id.checkButton);
        startButton.setOnClickListener(new startButtonListener());
        stopButton.setOnClickListener(new stopButtonListener());
        checkButton.setOnClickListener(new checkButtonListener());
    }
    class startButtonListener implements OnClickListener
    {

        /* (non-Javadoc)
         * @see android.view.View.OnClickListener#onClick(android.view.View)
         */
        @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, "当前网卡状态为："+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
        }
    }
    class stopButtonListener implements OnClickListener
    {
        /* (non-Javadoc)
         * @see android.view.View.OnClickListener#onClick(android.view.View)
         */
        @Override
        public void onClick(View v) {
            // 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, "当前网卡状态为："+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
        }
    }
    class checkButtonListener implements OnClickListener
    {
        /* (non-Javadoc)
         * @see android.view.View.OnClickListener#onClick(android.view.View)
         */
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            wifiManager=(WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);
            System.out.println("wifi state --->"+wifiManager.getWifiState());
            Toast.makeText(MainActivity.this, "当前网卡状态为："+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
        }
    }
}

四、效果