HTTP POST已停止

Question

我想发出一个简单的发帖请求，而我正在使用以下代码：

public void Encender_LED(View view){
    try {
        URL url = new URL("http://192.168.1.25");   
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        String data = "/relay=on";
        urlConnection.setDoOutput(true);
        urlConnection.setFixedLengthStreamingMode(data.getBytes().length);
        urlConnection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
        OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream());
        out.write(data.getBytes());
        out.flush();
        out.close();
    } catch (IOException e) {
        Toast.makeText(this, "No ha sido posible realizar la petición", Toast.LENGTH_SHORT).show();
    } finally {
        if(urlConnection!=null){
            urlConnection.disconnect();
        }
    }
}

尽管如此，我仍然遇到问题，并且出现一个警告对话框，其中显示文本“应用程序已停止”。它堆积在行中：

OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream());

我已在AndroidManifest.xml中添加了Internet权限