android 实时检测网络状态

xml添加权限:

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

onCreate:注册帧听
NetState receiver = new NetState();
IntentFilter filter = new IntentFilter();

filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
this.registerReceiver(receiver, filter);
receiver.onReceive(this, null);

添加类:

class NetState extends BroadcastReceiver{    @Override    public void onReceive(Context context, Intent arg1) {        ConnectivityManager manager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo gprs = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);        NetworkInfo wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);        if(!gprs.isConnected() && !wifi.isConnected())        {            AlertDialog.Builder ab = new AlertDialog.Builder(context);            ab.setMessage("网络连接断开，请检查网络");            ab.setPositiveButton("确定", new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface dialog, int which) {                    // TODO Auto-generated method stub                    dialog.dismiss();                }            }).show();        }        else{            AlertDialog.Builder ab = new AlertDialog.Builder(context);            ab.setMessage("网络连接成功");            ab.setPositiveButton("确定", new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface dialog, int which) {                    // TODO Auto-generated method stub                    dialog.dismiss();                }            }).show();                       }    }}

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