Question

我正在使用广播接收器来提供互联网。这是代码

private BroadcastReceiver mConnReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        boolean noConnectivity = intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
        String reason = intent.getStringExtra(ConnectivityManager.EXTRA_REASON);
        boolean isFailover = intent.getBooleanExtra(ConnectivityManager.EXTRA_IS_FAILOVER, false);

        NetworkInfo currentNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
        NetworkInfo otherNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_OTHER_NETWORK_INFO);

        if (!cd.isConnectingToInternet()) {
            // Internet Connection is not present
            alert.showAlertDialog(DashBoardActivity.this,
                    "Internet Connection Error",
                    "Please connect to working Internet connection", false);
            // stop executing code by return
            return;
        }

        if(currentNetworkInfo.isConnected()){
            Toast.makeText(getApplicationContext(), "Connected", Toast.LENGTH_LONG).show();
        }else{
            Toast.makeText(getApplicationContext(), "Not Connected", Toast.LENGTH_LONG).show();
        }
    }
};

@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();

    this.registerReceiver(this.mConnReceiver,
            new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    Toast.makeText(getApplicationContext(), "In resume", Toast.LENGTH_LONG).show();
}

当我打开WiFi onReceive只被调用一次但是当我关闭WiFi onReceive被调用两次因为弹出或上面代码中使用的Toast出现两次。

任何人都可以帮忙解决这个奇怪的错误吗？

Answer 1

    public void onReceive(Context context, Intent intent) {
        ConnectivityManager connManager = (ConnectivityManager) context
                        .getSystemService(Context.CONNECTIVITY_SERVICE);
        activeNetworkInfo = connManager.getActiveNetworkInfo();
        if (activeNetworkInfo != null && activeNetworkInfo.isAvailable()) {a
            Toast.makeText(getApplicationContext(),"Connected",Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(getApplicationContext(), "Not Connected", Toast.LENGTH_LONG).show();
            }
    }

Answer 2

我猜你在活动暂停时没有取消注册接收者。

将此添加到您的活动

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();

    this.unregisterReceiver(this.mConnReceiver);
    Toast.makeText(getApplicationContext(), "In pause", Toast.LENGTH_LONG).show();
}

Answer 3

据我所知，当我们可能有多个WiFi状态   设备中的关闭wifi。

使用以下代码检查wifi的状态并采取相应的措施：

int extraWifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_UNKNOWN);

    switch (extraWifiState)
    {
    case WifiManager.WIFI_STATE_DISABLED:
    case WifiManager.WIFI_STATE_DISABLING:
        enableUI(false);
        break;
    case WifiManager.WIFI_STATE_ENABLED:
        ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
        while(conMan.getActiveNetworkInfo() == null || conMan.getActiveNetworkInfo().getState() != NetworkInfo.State.CONNECTED)
        {
            try
            {
                Thread.sleep(500);
            } catch (InterruptedException e)
            {
                e.printStackTrace();
            }
        }
        update();
        enableUI(true);
        break;
    case WifiManager.WIFI_STATE_ENABLING:
        break;
    case WifiManager.WIFI_STATE_UNKNOWN:
        break;
    }

}

可能会帮助您找到问题的解决方案。

关闭wifi导致两次调用onReceive（）

3 个答案: