监听网络变化的广播

public class NetBroadcast extends BroadcastReceiver {
    private SharedPreferences sp;
    @Override
    public void onReceive(Context context, Intent intent) {
        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo mobNetworkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        NetworkInfo wifiNetworkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        if (!mobNetworkInfo.isConnected() && !wifiNetworkInfo.isConnected()){
            Toast.makeText(context, "当前网络环境不可用", Toast.LENGTH_SHORT).show();
        }else if (mobNetworkInfo.isConnected() || wifiNetworkInfo.isConnected()){
//            Toast.makeText(context, "广播：有网啦哈哈哈", Toast.LENGTH_SHORT).show();
            sp = context.getSharedPreferences("config", Context.MODE_PRIVATE);
            Boolean netBroadcast = PrefUtils.getBoolean(sp, "netBroadcast", false);
            if (!netBroadcast) {
                context.sendBroadcast(new Intent("com.bbdseven.lifenecessary.fragment.MainFragment.UpdateWeatherBroadcast"));
            }
            PrefUtils.setBoolean(sp, "netBroadcast", true);
        }
    }
}

<receiver android:name=".broadcast.NetBroadcast">
    <intent-filter>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
    </intent-filter>
</receiver>

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>

<uses-permission android:name="android.permission.INTERNET" />