获取Wifi信息及注册Wifi改变信息

项目用到，标记记录一下方便下一次使用。

先获取系统服务

(ConnectivityManager) mContext
                .getSystemService(Context.CONNECTIVITY_SERVICE);

注册广播

IntentFilter ifilter = new IntentFilter(
                    WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
            ifilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
            ifilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
            mContext.registerReceiver(mWifiStateReceiver, ifilter);

接收广播

public class WifiStateReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            try {
                AspLog.v(TAG,
                        "WifiStateReceiver onReceive:" + intent.getAction());
                if (intent.getAction().equals(
                        WifiManager.WIFI_STATE_CHANGED_ACTION)) {
                    if (dialog_loading != null) {
                        AspLog.v(TAG,
                                "WIFI_STATE_CHANGED_ACTION dialog_loading="
                                        + dialog_loading + ",showing="
                                        + dialog_loading.isShowing()
                                        + ",wifistate=" + getWIFIstate());
                    } else {
                        AspLog.v(TAG,
                                "WIFI_STATE_CHANGED_ACTION dialog_loading="
                                        + dialog_loading + ",showing=null"
                                        + ",wifistate=" + getWIFIstate());
                    }
                    if (dialog_loading != null && dialog_loading.isShowing()
                            && getWIFIstate() == State.CONNECTED) {
                        dialog_loading.dismiss();
                        finishAsOk(intent);
                    }
                }
                if (intent.getAction().equals(
                        WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {// 判断wifi
                                                                        // enable的事件
                    if (mWifiList == null || mWifiList.size() == 0) {
                        mWifiList = mWifiManager.getScanResults();
                        listScanResults();
                    }
                    handlerWIFIMessage(STATE_UPDATE_LIST);
                }
                if (intent.getAction().equals(
                        WifiManager.NETWORK_STATE_CHANGED_ACTION)) {// 判断wifi
                                                                    // enable的事件
                    mWifiList = mWifiManager.getScanResults();
                    listScanResults();
                    AspLog.v(TAG, "wifiList size:" + mWifiList.size());
                    handlerWIFIMessage(STATE_UPDATE_LIST);
                    if (dialog_loading != null) {
                        AspLog.v(TAG,
                                "NETWORK_STATE_CHANGED_ACTION dialog_loading="
                                        + dialog_loading + ",showing="
                                        + dialog_loading.isShowing()
                                        + ",wifistate=" + getWIFIstate());
                    } else {
                        AspLog.v(TAG,
                                "NETWORK_STATE_CHANGED_ACTION dialog_loading="
                                        + dialog_loading + ",showing= null"
                                        + ",wifistate=" + getWIFIstate());
                    }
                    if (dialog_loading != null && dialog_loading.isShowing()
                            && getWIFIstate() == State.CONNECTED) {
                        dialog_loading.dismiss();
                        finishAsOk(intent);
                    }
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

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资料：

http://www.yidin.net/?p=8280

http://www.yidin.net/?p=9725