Author:Even
1. WifiManager
WifiManager是管理android WIFI的連接服務，它可以配置WIFI網絡連接，管理當前wifi連接，掃描接入點，監視wifi連接狀態；
使用必需加權限：
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />使用getSystemService方法訪問
private static WifiManager wifiManager; String wifiService = getActivity().WIFI_SERVICE; wifiManager = (WifiManager) getActivity().getSystemService(wifiService);
2. wifi開關
wifiManager.setWifiEnabled(isChecked);
3. 監聽wifi連接狀態
註冊廣播:
IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION); intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION); intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION); intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); getActivity().registerReceiver(receiver, intentFilter);
監聽：
/*
* 監聽wifi狀態
*/
private BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
Log.i(TAG,"接入點掃描已經完成，從懇求者那裏可以得到結果");
} else if (action.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {
int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);
switch (wifiState) {
case WifiManager.WIFI_STATE_ENABLED:
Log.i(TAG,"獲取到wifi開啓的廣播時，開始掃描");
break;
case WifiManager.WIFI_STATE_DISABLED:
Log.i(TAG,"wifi關閉發出的廣播");
break;
}
}else if (action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
/*
* 顯示Wi-Fi連接狀態改變的廣播意圖動作
*/
NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
if (info.getState().equals(NetworkInfo.State.DISCONNECTED)) {
Log.i(TAG,"連接已斷開");
}
else if (info.getState().equals(NetworkInfo.State.CONNECTED)) {
Log.i("AAA","已連接");
} else {
NetworkInfo.DetailedState state = info.getDetailedState();
if (state == state.CONNECTING) {
Log.i("AAA","連接中...");
} else if (state == state.AUTHENTICATING) {
Log.i("AAA","正在驗證身份信息...");
} else if (state == state.OBTAINING_IPADDR) {
Log.i("AAA","正在獲取IP地址...");
} else if (state == state.FAILED) {
Log.i("AAA","連接失敗");
}
}
}
else if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) { //查看wifi是否在連接狀態
if (intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false)) {
Log.i("AAA","查看wifi是否在連接狀態 "+false);
} else {
Log.i("AAA","查看wifi是否在連接狀態 "+true);
}
}
}
};我們拿到wifi的狀態就可以做很多事了
4. 拿到掃描的wifi列表
首先要搜一下wifi信號
/*
* 搜索wifi熱點
*/
private void search() {
wifiManager.startScan();
}存放在list中
List<ScanResult> scanResults; scanResults = wifiManager.getScanResults();
拿到wifi列表它就任你怎麼玩了 --
一般而言，你打印就知道，你拿的wifi信號會發現有些是重複的，這是因爲把 SSID和BSSI的wifi信號全部掃描出來了，你這個時候，就可以使用這個方法過濾一遍保留ssid
/*
* 以 SSID 爲關鍵字，過濾掉信號弱和重複wifi選項
*/
public static List<ScanResult> filterScanResult(final List<ScanResult> list) {
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
LinkedHashMap<String, ScanResult> linkedMap = new LinkedHashMap<>(list.size());
for (ScanResult rst : list) {
if (linkedMap.containsKey(rst.SSID)) {
if (rst.level > linkedMap.get(rst.SSID).level ) {
linkedMap.put(rst.SSID, rst);
}
continue;
}
linkedMap.put(rst.SSID, rst);
}
list.clear();
list.addAll(linkedMap.values());
return list;
}5.加載到listview中
拿好了wifi列表就可以寫一個adapter加載到listview中了
/*
* wifi列表的加載器
*/
public class WifiListAdapter extends ArrayAdapter<ScanResult> {
private final LayoutInflater mInflater;
private int mResource;
public WifiListAdapter(Context context, int resource) {
super(context, resource);
mInflater = LayoutInflater.from(context);
mResource = resource;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = mInflater.inflate(mResource, parent, false);
}
TextView name = (TextView) convertView.findViewById(R.id.wifi_name);
ScanResult scanResult = getItem(position);
name.setText(scanResult.SSID);
return convertView;
}
}6. 獲取信號的強弱，是否加密
在加載adapter的時候，可以去獲取對應信號的很多信息，包括一些地址，類別，信號強弱，是否需要密碼等等
信號強弱
ScanResult scanResult = getItem(position);
int level = scanResult.level;
if (level <= 0 && level >= -50) {
signl.setBackgroundResource(R.drawable.icon_wifi_level4);
} else if (level < -50 && level >= -70) {
signl.setBackgroundResource(R.drawable.icon_wifi_level3);
} else if (level < -70 && level >= -80) {
signl.setBackgroundResource(R.drawable.icon_wifi_level2);
} else if (level < -80 && level >= -100) {
signl.setBackgroundResource(R.drawable.icon_wifi_level1);
}是否加密
ScanResult scanResult = getItem(position);
String capabilities = scanResult.capabilities;
if (!TextUtils.isEmpty(capabilities)) {
if (capabilities.contains("WPA") || capabilities.contains("wpa")) {
//wpa類型密碼
} else if (capabilities.contains("WEP") || capabilities.contains("wep")) {
//wep類型密碼
} else {
//無密碼
type = WIFICIPHER_NOPASS;
}
}7. 連接wifi
首先我們要判斷指定的wifi信號是否有保存密碼
/*
* 判斷當前wifi是否有保存
*/
private WifiConfiguration config;
private WifiConfiguration isExsits(String SSID) {
List<WifiConfiguration> existingConfigs = wifiManager.getConfiguredNetworks();
for (WifiConfiguration existingConfig : existingConfigs) {
if (existingConfig.SSID.equals("\"" + SSID + "\"")) {
return existingConfig;
}
}
return null;
}
。。。
/*
* 彈出帶editText的AlertDialog框，獲取輸入的密碼
*/
if (config == null) {
if (type != WIFICIPHER_NOPASS) {//需要密碼
final EditText editText = new EditText(getActivity());
final int finalType = type;
new AlertDialog.Builder(getActivity()).setTitle(
getResources().getString(R.string.enter_wifi)).setIcon(
android.R.drawable.ic_dialog_info).setView(
editText).setPositiveButton(
getResources().getString(R.string.confirm),
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
config = createWifiInfo(scanResult.SSID, editText.getText().toString(), finalType);
connect(config,position);
}
})
.setNegativeButton(getResources().getString(R.string.cancel), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).show();
return;
} else {
config = createWifiInfo(scanResult.SSID, "", type);
connect(config,position);
}
。。。
/*
* 連接的方法
*/
private int wcgID;
private void connect(WifiConfiguration config,int position) {
Visible_cur_wifi_view(true);
wcgID = wifiManager.addNetwork(config);
wifiManager.enableNetwork(wcgID, true);
}8. 忘記密碼
/*
* 傳入對應的wifi的ssid
忘卻密碼的方法
*/
public void removeWifi_si(String charSequence){
List<WifiConfiguration> wifiConfigurations = wifiManager.getConfiguredNetworks();
//忘卻wifi密碼
for (WifiConfiguration wifiConfig : wifiConfigurations) {
String ssid = wifiConfig.SSID;
if (ssid.substring(1, ssid.length() - 1).equals(charSequence)) {
wifiManager.removeNetwork(wifiConfig.networkId);
wifiManager.saveConfiguration();
}
}
}9. 斷開wifi信號
wifiManager.disconnect();