01_23_WIFI网络操作

01_23_WIFI网络操作

//WifiActivity.java
package mars.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 WifiActivity extends Activity {
    /** Called when the activity is first created. */
    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.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)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
            wifiManager.setWifiEnabled(true);
            System.out.println("wifi state --->" + wifiManager.getWifiState());
            Toast.makeText(WifiActivity.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)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
            wifiManager.setWifiEnabled(false);
            System.out.println("wifi state --->" + wifiManager.getWifiState());
            Toast.makeText(WifiActivity.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)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
            System.out.println("wifi state --->" + wifiManager.getWifiState());
            Toast.makeText(WifiActivity.this, "当前Wifi网卡状态为" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
        }

    }
}

注意在AndroidMainfest.xml中添加  改变网络状态、改变WIFI状态 、访问网络状态、访问WIFI状态权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android=""
    package="mars.wifi" android:versionCode="1" android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".WifiActivity" 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>
    <uses-sdk android:minSdkVersion="4" />
    <!-- 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>
</manifest>