android - CONNECTIVITY_ACTION 的 BroadcastReceiver 在 intent.getExtras() 中总是返回 null

Question

我正在尝试接收来自 CONNECTIVITY_ACTION 的 BroadcastMessages:

    // register BroadcastReceiver on network state changes
    final IntentFilter mIFNetwork = new IntentFilter();
    mIFNetwork.addAction(android.net.ConnectivityManager.CONNECTIVITY_ACTION); //"android.net.conn.CONNECTIVITY_CHANGE"
    registerReceiver(mIRNetwork, mIFNetwork);

接收者是:

private BroadcastReceiver mIRNetwork = new BroadcastReceiver() {
    @Override
    public void onReceive(final Context context, final Intent intent) {

        android.util.Log.i(TAG,"mIRNetwork: Network State Received: "+intent.getAction());
        Bundle extras = intent.getExtras();
        if (extras!=null){
                android.util.Log.i(TAG,"mIRNetwork: ACTION_BACKGROUND_DATA_SETTING_CHANGED: "+extras.getString(ConnectivityManager.ACTION_BACKGROUND_DATA_SETTING_CHANGED));
                android.util.Log.i(TAG,"mIRNetwork: CONNECTIVITY_ACTION: "+extras.getString(ConnectivityManager.CONNECTIVITY_ACTION));
                android.util.Log.i(TAG,"mIRNetwork: EXTRA_EXTRA_INFO: "+extras.getString(ConnectivityManager.EXTRA_EXTRA_INFO));
                android.util.Log.i(TAG,"mIRNetwork: EXTRA_NO_CONNECTIVITY: "+extras.getString(ConnectivityManager.EXTRA_NO_CONNECTIVITY));
                android.util.Log.i(TAG,"mIRNetwork: EXTRA_REASON: "+extras.getString(ConnectivityManager.EXTRA_REASON));

            }
        }

简而言之，extras 始终为 null。我认为，如果我失去 WiFi 连接，我应该获得 EXTRA_NO_CONNECTIVITY(因为它是访问互联网的唯一途径)或至少是列表中的某些内容。但没有运气。如果我断开连接，我的 WiFi AP 接收器会收到他的消息，但附加信息为空。当我再次打开我的 WiFi 时，接收器会触发但没有额外信号……这是为什么？如何知道该应用程序丢失了任何网络连接？我认为这是方式。

Answer 1

你不能得到额外的，但你可以通过这种方式获得数据

private class ConnectivityBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        boolean noConnectivity = intent.getBooleanExtra(ConnectivityManager
                .EXTRA_NO_CONNECTIVITY, false);
        NetworkInfo info1 = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager
                .EXTRA_NETWORK_INFO);
        NetworkInfo info2 = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager
                .EXTRA_OTHER_NETWORK_INFO);
        String reason = intent.getStringExtra(ConnectivityManager.EXTRA_REASON);
        boolean failOver = intent.getBooleanExtra(ConnectivityManager.EXTRA_IS_FAILOVER, false);
        Log.d("MY_TAG", "onReceive(): mNetworkInfo=" + info1 + " mOtherNetworkInfo = " +
                (info2 == null ? "[none]" : info2 + " noConn=" + noConnectivity));
    }
}

更多信息请看这里

http://code.google.com/p/androidwisprclient/source/browse/trunk/src/com/joan/pruebas/NetworkConnectivityListener.java?r=2