Android 监听wifi广播的两种方式

1.XML中声明

 <receiver android:name=".NetworkConnectChangedReceiver" >
            <intent-filter>
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
                <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
                <action android:name="android.net.wifi.STATE_CHANGE" />
            </intent-filter>
        </receiver>

 

2.代码中注册

 IntentFilter filter = new IntentFilter();
 filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
 filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
 filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
 registerReceiver(new NetworkConnectChangedReceiver(), filter);

 

3.实现

package com.example.testss;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.net.NetworkInfo.State;import android.net.wifi.WifiManager;import android.os.Parcelable;import android.util.Log;public class NetworkConnectChangedReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction())) {// 这个监听wifi的打开与关闭，与wifi的连接无关            int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);            Log.e("H3c", "wifiState" + wifiState);            switch (wifiState) {            case WifiManager.WIFI_STATE_DISABLED:                break;            case WifiManager.WIFI_STATE_DISABLING:                break;            //            }        }        // 这个监听wifi的连接状态即是否连上了一个有效无线路由，当上边广播的状态是WifiManager.WIFI_STATE_DISABLING，和WIFI_STATE_DISABLED的时候，根本不会接到这个广播。        // 在上边广播接到广播是WifiManager.WIFI_STATE_ENABLED状态的同时也会接到这个广播，当然刚打开wifi肯定还没有连接到有效的无线        if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction())) {            Parcelable parcelableExtra = intent                    .getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);            if (null != parcelableExtra) {                NetworkInfo networkInfo = (NetworkInfo) parcelableExtra;                State state = networkInfo.getState();                boolean isConnected = state == State.CONNECTED;// 当然，这边可以更精确的确定状态                Log.e("H3c", "isConnected" + isConnected);                if (isConnected) {                } else {                }            }        }        // 这个监听网络连接的设置，包括wifi和移动数据的打开和关闭。.        // 最好用的还是这个监听。wifi如果打开，关闭，以及连接上可用的连接都会接到监听。见log        // 这个广播的最大弊端是比上边两个广播的反应要慢，如果只是要监听wifi，我觉得还是用上边两个配合比较合适        if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
ConnectivityManager manager = (ConnectivityManager) context    .getSystemService(Context.CONNECTIVITY_SERVICE);  NetworkInfo gprs = manager    .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);  NetworkInfo wifi = manager    .getNetworkInfo(ConnectivityManager.TYPE_WIFI);
  Log.i(TAG, "网络状态改变:" + wifi.isConnected() + " 3g:" + gprs.isConnected());
            NetworkInfo info = intent                    .getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);            if (info != null) {                Log.e("H3c", "info.getTypeName()" + info.getTypeName());                Log.e("H3c", "getSubtypeName()" + info.getSubtypeName());                Log.e("H3c", "getState()" + info.getState());                Log.e("H3c", "getDetailedState()"                        + info.getDetailedState().name());                Log.e("H3c", "getDetailedState()" + info.getExtraInfo());                Log.e("H3c", "getType()" + info.getType());                if (NetworkInfo.State.CONNECTED == info.getState()) {                } else if (info.getType() == 1) {                    if (NetworkInfo.State.DISCONNECTING == info.getState()) {                    }                }            }        }    }}