Examples_08_08
WifiActivity
package com.yarin.android.Examples_08_08; import java.util.List; import android.app.Activity; import android.net.wifi.ScanResult; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class WifiActivity extends Activity { /** Called when the activity is first created. */ private TextView allNetWork; private Button scan; private Button start; private Button stop; private Button check; private WifiAdmin mWifiAdmin; // 扫描结果列表 private List<ScanResult> list; private ScanResult mScanResult; private StringBuffer sb=new StringBuffer(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mWifiAdmin = new WifiAdmin(WifiActivity.this); init(); } public void init(){ allNetWork = (TextView) findViewById(R.id.allNetWork); scan = (Button) findViewById(R.id.scan); start = (Button) findViewById(R.id.start); stop = (Button) findViewById(R.id.stop); check = (Button) findViewById(R.id.check); scan.setOnClickListener(new MyListener()); start.setOnClickListener(new MyListener()); stop.setOnClickListener(new MyListener()); check.setOnClickListener(new MyListener()); } private class MyListener implements OnClickListener{ @Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.scan://扫描网络 getAllNetWorkList(); break; case R.id.start://打开Wifi mWifiAdmin.openWifi(); Toast.makeText(WifiActivity.this, "当前wifi状态为："+mWifiAdmin.checkState(), 1).show(); break; case R.id.stop://关闭Wifi mWifiAdmin.closeWifi(); Toast.makeText(WifiActivity.this, "当前wifi状态为："+mWifiAdmin.checkState(), 1).show(); break; case R.id.check://Wifi状态 Toast.makeText(WifiActivity.this, "当前wifi状态为："+mWifiAdmin.checkState(), 1).show(); break; default: break; } } } public void getAllNetWorkList(){ // 每次点击扫描之前清空上一次的扫描结果 if(sb!=null){ sb=new StringBuffer(); } //开始扫描网络 mWifiAdmin.startScan(); list=mWifiAdmin.getWifiList(); if(list!=null){ for(int i=0;i<list.size();i++){ //得到扫描结果 mScanResult=list.get(i); sb=sb.append(mScanResult.BSSID+" ").append(mScanResult.SSID+" ") .append(mScanResult.capabilities+" ").append(mScanResult.frequency+" ") .append(mScanResult.level+"\n\n"); } allNetWork.setText("扫描到的wifi网络：\n"+sb.toString()); } } }
WifiAdmin
package com.yarin.android.Examples_08_08; import java.util.List; import android.content.Context; import android.net.wifi.ScanResult; import android.net.wifi.WifiConfiguration; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.net.wifi.WifiManager.WifiLock; public class WifiAdmin { //定义一个WifiManager对象 private WifiManager mWifiManager; //定义一个WifiInfo对象 private WifiInfo mWifiInfo; //扫描出的网络连接列表 private List<ScanResult> mWifiList; //网络连接列表 private List<WifiConfiguration> mWifiConfigurations; WifiLock mWifiLock; public WifiAdmin(Context context){ //取得WifiManager对象 mWifiManager=(WifiManager) context.getSystemService(Context.WIFI_SERVICE); //取得WifiInfo对象 mWifiInfo=mWifiManager.getConnectionInfo(); } //打开wifi public void openWifi(){ if(!mWifiManager.isWifiEnabled()){ mWifiManager.setWifiEnabled(true); } } //关闭wifi public void closeWifi(){ if(mWifiManager.isWifiEnabled()){ mWifiManager.setWifiEnabled(false); } } // 检查当前wifi状态 public int checkState() { return mWifiManager.getWifiState(); } //锁定wifiLock public void acquireWifiLock(){ mWifiLock.acquire(); } //解锁wifiLock public void releaseWifiLock(){ //判断是否锁定 if(mWifiLock.isHeld()){ mWifiLock.acquire(); } } //创建一个wifiLock public void createWifiLock(){ mWifiLock=mWifiManager.createWifiLock("test"); } //得到配置好的网络 public List<WifiConfiguration> getConfiguration(){ return mWifiConfigurations; } //指定配置好的网络进行连接 public void connetionConfiguration(int index){ if(index>mWifiConfigurations.size()){ return ; } //连接配置好指定ID的网络 mWifiManager.enableNetwork(mWifiConfigurations.get(index).networkId, true); } public void startScan(){ mWifiManager.startScan(); //得到扫描结果 mWifiList=mWifiManager.getScanResults(); //得到配置好的网络连接 mWifiConfigurations=mWifiManager.getConfiguredNetworks(); } //得到网络列表 public List<ScanResult> getWifiList(){ return mWifiList; } //查看扫描结果 public StringBuffer lookUpScan(){ StringBuffer sb=new StringBuffer(); for(int i=0;i<mWifiList.size();i++){ sb.append("Index_" + new Integer(i + 1).toString() + ":"); // 将ScanResult信息转换成一个字符串包 // 其中把包括：BSSID、SSID、capabilities、frequency、level sb.append((mWifiList.get(i)).toString()).append("\n"); } return sb; } public String getMacAddress(){ return (mWifiInfo==null)?"NULL":mWifiInfo.getMacAddress(); } public String getBSSID(){ return (mWifiInfo==null)?"NULL":mWifiInfo.getBSSID(); } public int getIpAddress(){ return (mWifiInfo==null)?0:mWifiInfo.getIpAddress(); } //得到连接的ID public int getNetWordId(){ return (mWifiInfo==null)?0:mWifiInfo.getNetworkId(); } //得到wifiInfo的所有信息 public String getWifiInfo(){ return (mWifiInfo==null)?"NULL":mWifiInfo.toString(); } //添加一个网络并连接 public void addNetWork(WifiConfiguration configuration){ int wcgId=mWifiManager.addNetwork(configuration); mWifiManager.enableNetwork(wcgId, true); } //断开指定ID的网络 public void disConnectionWifi(int netId){ mWifiManager.disableNetwork(netId); mWifiManager.disconnect(); } }
/Examples_08_08/res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <Button android:id="@+id/scan" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="扫描网络" /> <Button android:id="@+id/start" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="打开Wifi" /> <Button android:id="@+id/stop" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="关闭Wifi" /> <Button android:id="@+id/check" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Wifi状态" /> <TextView android:id="@+id/allNetWork" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="当前没有扫描到Wifi网络" /> </LinearLayout> </ScrollView>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.yarin.android.Examples_08_08"
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-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_CHECKIN_PROPERTIES"></uses-permission>
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.MODIFY_PHONE_STATE"></uses-permission>
<uses-sdk android:minSdkVersion="5" />
</manifest>
现在发现关闭wifi无效，是因为没有权限，还是其他什么原因？