mars老师[Android开发视频教授教养]01_23 WIFI网络操作

mars老师[Android开发视频教学]01_23 WIFI网络操作

mars老师[Android开发视频教学]01_23 WIFI网络操作

创建项目：Wifi

项目运行截图：

布局文件：main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    /><Button android:id="@+id/startWifi"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="启动手机的wifi网卡"    /><Button android:id="@+id/stopWifi"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="关闭手机的wifi网卡"    /><Button android:id="@+id/checkWifi"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="检查当前wifi网卡状态"    /></LinearLayout>

在manifest文件设置权限：AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/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> 

==>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{@Overridepublic 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{@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubwifiManager = (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{@Overridepublic 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();}        }}