Android WiFi连接管理-优快云博客

//主界面

public class MainActivity extends Activity implements OnClickListener {
public static final String TAG = "MainActivity";
private Button scan_wifi;
private ListView mlistView;
protected WifiAdmin mWifiAdmin;
private List<ScanResult> mWifiList;
public int level;
protected String ssid;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mWifiAdmin = new WifiAdmin(MainActivity.this);
initViews();
IntentFilter filter = new IntentFilter(
WifiManager.NETWORK_STATE_CHANGED_ACTION);
//="android.net.wifi.STATE_CHANGE" 监听wifi状态的变化
registerReceiver(mReceiver, filter);
mlistView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
ScanResult result = mWifiList.get(position);
ssid=result.SSID;
if (!WifiAdmin.isLocked(result)) {
mWifiAdmin.addNetwork(mWifiAdmin.CreateWifiInfo(ssid, "", 1));
}else{
AlertDialog.Builder alert=new AlertDialog.Builder(MainActivity.this);
alert.setTitle(ssid);
alert.setMessage("输入密码");
final EditText et_password=new EditText(MainActivity.this);
final SharedPreferences preferences=getSharedPreferences("wifi_password",Context.MODE_PRIVATE);
et_password.setText(preferences.getString(ssid, ""));
alert.setView(et_password);
//alert.setView(view1);
alert.setPositiveButton("连接", new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
String pw = et_password.getText().toString();
if(null == pw || pw.length() < 8){
Toast.makeText(MainActivity.this, "密码至少8位", Toast.LENGTH_SHORT).show();
return;
}
Editor editor=preferences.edit();
editor.putString(ssid, pw); //保存密码
editor.commit();
mWifiAdmin.addNetwork(mWifiAdmin.CreateWifiInfo(ssid, et_password.getText().toString(), 3));
}
});
alert.setNegativeButton("取消", new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
//
//mWifiAdmin.removeWifi(mWifiAdmin.getNetworkId());
}
});
alert.create();
alert.show();
}
}
});

}

/*
* 控件初始化
* */
private void initViews() {
scan_wifi=(Button) findViewById(R.id.scan_wifi);
mlistView=(ListView) findViewById(R.id.wifi_list);

scan_wifi.setOnClickListener(MainActivity.this);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.scan_wifi:
mWifiAdmin.startScan(MainActivity.this);
mWifiList=mWifiAdmin.getWifiList();
if(mWifiList!=null){
mlistView.setAdapter(new MyAdapter(this,mWifiList));
}
break;
default:
break;
}
}

public class MyAdapter extends BaseAdapter{
LayoutInflater inflater;
List<ScanResult> list;
public MyAdapter(Context context, List<ScanResult> list){
this.inflater=LayoutInflater.from(context);
this.list=list;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@SuppressLint({ "ViewHolder", "InflateParams" })
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view=null;
view=inflater.inflate(R.layout.wifi_listitem, null);
ScanResult scanResult = list.get(position);
TextView wifi_ssid=(TextView) view.findViewById(R.id.ssid);
ImageView wifi_level=(ImageView) view.findViewById(R.id.wifi_level);
wifi_ssid.setText(scanResult.SSID);
Log.i(TAG, "scanResult.SSID="+scanResult);
level=WifiManager.calculateSignalLevel(scanResult.level,5);
if(WifiAdmin.isLocked(scanResult)){
wifi_level.setImageResource(R.drawable.wifi_signal_lock);
}else{
wifi_level.setImageResource(R.drawable.wifi_signal_open);
}
wifi_level.setImageLevel(level);
//判断信号强度，显示对应的指示图标
return view;
}
}

//监听wifi状态
private BroadcastReceiver mReceiver = new BroadcastReceiver (){
@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo wifiInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if(wifiInfo.isConnected()){
WifiManager wifiManager = (WifiManager) context
.getSystemService(Context.WIFI_SERVICE);
String wifiSSID = wifiManager.getConnectionInfo()
.getSSID();
Toast.makeText(context, wifiSSID+"连接成功", 1).show();
}
}

};
}

//另一个界面

public class WifiAdmin {
// 定义WifiManager对象
private WifiManager mWifiManager;
// 定义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> mWifiConfiguration;
// 定义一个WifiLock
WifiLock mWifiLock;

// 构造器
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(Context context) {
// if (!mWifiManager.isWifiEnabled()) {
// mWifiManager.setWifiEnabled(true);
// }else if (mWifiManager.getWifiState() == 2) {
// Toast.makeText(context,"亲，Wifi正在开启，不用再开了", Toast.LENGTH_SHORT).show();
// }else{
// Toast.makeText(context,"亲，Wifi已经开启,不用再开了", Toast.LENGTH_SHORT).show();
// }
// }
//
// // 关闭WIFI
// public void closeWifi(Context context) {
// if (mWifiManager.isWifiEnabled()) {
// mWifiManager.setWifiEnabled(false);
// }else if(mWifiManager.getWifiState() == 1){
// Toast.makeText(context,"亲，Wifi已经关闭，不用再关了", Toast.LENGTH_SHORT).show();
// }else if (mWifiManager.getWifiState() == 0) {
// Toast.makeText(context,"亲，Wifi正在关闭，不用再关了", Toast.LENGTH_SHORT).show();
// }else{
// Toast.makeText(context,"请重新关闭", Toast.LENGTH_SHORT).show();
// }
// }
//

// 锁定WifiLock
public void acquireWifiLock() {
mWifiLock.acquire();
}

// 解锁WifiLock
public void releaseWifiLock() {
// 判断时候锁定
if (mWifiLock.isHeld()) {
mWifiLock.acquire();
}
}

// 创建一个WifiLock
public void creatWifiLock() {
mWifiLock = mWifiManager.createWifiLock("Test");
}

// 得到配置好的网络
public List<WifiConfiguration> getConfiguration() {
return mWifiConfiguration;
}

// 指定配置好的网络进行连接
public void connectConfiguration(int index) {
// 索引大于配置好的网络索引返回
if (index > mWifiConfiguration.size()) {
return;
}
// 连接配置好的指定ID的网络
mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId,
true);
}

public void startScan(Context context) {
mWifiManager.startScan();
// 得到扫描结果
List<ScanResult> results = mWifiManager.getScanResults();
// 得到配置好的网络连接
mWifiConfiguration = mWifiManager.getConfiguredNetworks();
if (results == null) { //没有结果
if(mWifiManager.getWifiState()==3){
Toast.makeText(context,"当前区域没有无线网络", Toast.LENGTH_SHORT).show();
}else if(mWifiManager.getWifiState()==2){
Toast.makeText(context,"WiFi正在开启，请稍后重新点击扫描", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(context,"WiFi没有开启，无法扫描", Toast.LENGTH_SHORT).show();
}
}else {
mWifiList = results;
// //如果你发现大量重复的wifi，可以替换为以下代码
// mWifiList = new ArrayList();
// for (ScanResult result : results) {
// //过滤无效的wifi
// if (result.SSID == null || result.SSID.length() == 0
// || result.capabilities.contains("[IBSS]")) {
// continue;
// }
//
// //去重
// boolean found = false;
// for (ScanResult item : mWifiList) {
// if (item.SSID.equals(result.SSID)
// && item.capabilities.equals(result.capabilities)) {
// found = true;
// break;
// }
// }
// if (!found) {
// mWifiList.add(result);
// }
// }
}
}

// 得到网络列表
public List<ScanResult> getWifiList() {
return mWifiList;
}

// 查看扫描结果
public StringBuilder lookUpScan() {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < mWifiList.size(); i++) {
stringBuilder
.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
stringBuilder.append((mWifiList.get(i)).toString());
stringBuilder.append("/n");
}
return stringBuilder;
}

// 得到接入点的BSSID
public String getBSSID() {
return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID();
}

// 添加一个网络并连接
public void addNetwork(WifiConfiguration wcg) {
int wcgID = mWifiManager.addNetwork(wcg);
boolean b = mWifiManager.enableNetwork(wcgID, true);
}

// 断开指定ID的网络
public void disconnectWifi(int netId) {
mWifiManager.disableNetwork(netId);
mWifiManager.disconnect();
}

public void removeWifi(int netId) {
disconnectWifi(netId);
mWifiManager.removeNetwork(netId);
}

//然后是一个实际应用方法，只验证过没有密码的情况：

public WifiConfiguration CreateWifiInfo(String SSID, String Password, int Type)
{
WifiConfiguration config = new WifiConfiguration();
config.allowedAuthAlgorithms.clear();
config.allowedGroupCiphers.clear();
config.allowedKeyManagement.clear();
config.allowedPairwiseCiphers.clear();
config.allowedProtocols.clear();
config.SSID = "\"" + SSID + "\"";

WifiConfiguration tempConfig = this.IsExsits(SSID);
if(tempConfig != null) {
mWifiManager.removeNetwork(tempConfig.networkId);
}

if(Type == 1) //WIFICIPHER_NOPASS
{
config.wepKeys[0] = "";
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
config.wepTxKeyIndex = 0;
}
if(Type == 2) //WIFICIPHER_WEP
{
config.hiddenSSID = true;
config.wepKeys[0]= "\""+Password+"\"";
config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
config.wepTxKeyIndex = 0;
}
if(Type == 3) //WIFICIPHER_WPA
{
config.preSharedKey = "\""+Password+"\"";
config.hiddenSSID = true;
config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
//config.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
config.status = WifiConfiguration.Status.ENABLED;
}
return config;
}

private WifiConfiguration IsExsits(String SSID)
{
List<WifiConfiguration> existingConfigs = mWifiManager.getConfiguredNetworks();
for (WifiConfiguration existingConfig : existingConfigs)
{
if (existingConfig.SSID.equals("\""+SSID+"\""))
{
return existingConfig;
}
}
return null;
}

public static boolean isLocked(ScanResult result){
if (result.capabilities.contains("WEP") || result.capabilities.contains("PSK")
|| result.capabilities.contains("EAP")){
return true;
}
return false;
}
}

WIFi