不断检查Android中是否可用互联网连接的有效方法

不断检查Android中是否可用互联网连接的有效方法

用接收器来做。您可以收到有关网络状态更改的通知。例如，

private BroadcastReceiver networkReceiver = new BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {     super.onReceive(context, intent);     if(intent.getExtras()!=null) {        NetworkInfo ni=(NetworkInfo) intent.getExtras().get(ConnectivityManager.EXTRA_NETWORK_INFO);        if(ni!=null && ni.getState()==NetworkInfo.State.CONNECTED) { // we're connected        }     }     // we're not connected    }}

在您的网站上

onResume()

注册，然后在上注销

onPause()

。

@Overrideprotected void onPause() {    super.onPause();    unregisterReceiver(networkReceiver);}@Overrideprotected void onResume() {    super.onResume();    IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);    registerReceiver(networkReceiver, filter);}

此外，要在注册接收者之前获取初始状态，请在您的

onResume()

方法中调用此方法，

public boolean isNetworkConnected() {        ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo netInfo = cm.getActiveNetworkInfo();        if (netInfo != null && netInfo.isConnectedOrConnecting()) { return true;        }        return false;    }

确保您的应用请求此权限，

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