需要在真机上使用才有更好的效果
在main.xml中：
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:orientation="vertical"
android:gravity="center_horizontal">
<TextView
android:id="@+id/msg"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:gravity="center_horizontal"
android:textSize="20dp"
android:textColor="#ffffff"/>
<Button
android:id="@+id/open"
android:layout_marginTop="8dp"
android:layout_width="80dp"
android:layout_height="40dp"
android:background="#3399ff"
android:textColor="#ffffff"
android:text="打开WIFI"/>
<Button
android:id="@+id/close"
android:layout_marginTop="8dp"
android:layout_width="80dp"
android:layout_height="40dp"
android:background="#3399ff"
android:textColor="#ffffff"
android:text="关闭WIFI"/>
<Button
android:id="@+id/check"
android:layout_marginTop="8dp"
android:layout_width="80dp"
android:layout_height="40dp"
android:background="#3399ff"
android:textColor="#ffffff"
android:text="检查WIFI"/>
</LinearLayout>
在MyWifiDemo.java中：
package com.li.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.TextView;
public class MyWifiDemo extends Activity {
private Button open = null ;
private Button close = null ;
private Button check = null ;
private TextView msg = null ;
private WifiManager wifiManager = null ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.open = (Button) super.findViewById(R.id.open) ;
this.close = (Button) super.findViewById(R.id.close) ;
this.check = (Button) super.findViewById(R.id.check) ;
this.msg = (TextView) super.findViewById(R.id.msg) ;
this.wifiManager = (WifiManager) super
.getSystemService(Context.WIFI_SERVICE);
this.open.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
MyWifiDemo.this.wifiManager.setWifiEnabled(true) ; // 启用wifi
MyWifiDemo.this.msg.setText("打开WIFI状态：" + MyWifiDemo.this.wifiManager.getWifiState()) ;
}
}) ;
this.close.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
MyWifiDemo.this.wifiManager.setWifiEnabled(false) ; // 启用wifi
MyWifiDemo.this.msg.setText("关闭WIFI状态：" + MyWifiDemo.this.wifiManager.getWifiState()) ;
}
}) ;
this.check.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
MyWifiDemo.this.msg.setText("检查WIFI状态：" + MyWifiDemo.this.wifiManager.getWifiState()) ;
}
}) ;
}
}
在AndroidManifest.xml中修改权限：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.li.wifi"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MyWifiDemo"
android:label="@string/title_activity_my_wifi_demo" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>