我目前正在尝试在Android Studio上进行发布请求练习。我创建了一个按钮，当单击该按钮时，它应该从textview中获取一个数字，并将其作为参数传递给URL并得到响应。
我已经学会了如何自行执行发布请求，并且当我在Visual Studio Code上运行该请求时，我的代码也可以正常工作。 但是，当我在Android Studio上运行相同的代码时，则不会发生连接。
这是我的代码。
$('#btnAddToList').click(function () {
item++;
var customer_name = $('#customer_name').val();
var producto_name = $('#producto_name').val();
var product_price = $('#product_price').val();
var product_stock = $('#product_stock').val();
var product_quantity = $('#product_quantity').val();
var Subtotal = product_price * product_quantity;
var fila = '<tr><td>' + item + '</td><td>' + customer_name + '</td><td>' + producto_name + '</td><td>' + product_price + '</td><td>' + product_stock + '</td><td>' + product_quantity + '</td><td class="td-Subtotal">' + Subtotal + '</td></tr>';
var btn = document.createElement('tr');
btn.innerHTML = fila;
document.getElementById('dtProduct').appendChild(btn);
// initialize
var total = 0;
// loop
$(".td-subtotal").each(function(){
// get value
total+=$(this).html();
});
// assign
$("#total_pay").val(total);
});
我用随机字符串替换了网址和参数。
问题发生在第Button translate = findViewById(R.id.transButton);
translate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v){
TextView postText = findViewById(R.id.postText);
String number = result.getText().toString();
String output = "";
HttpURLConnection connection = null;
try {
URL url = new URL("some random url that i replaced with");
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Accept-Charset","UTF-8");
connection.setDoOutput(true);
connection.setDoInput(true);
connection.connect();
String parameters = "random parameters";
OutputStream out = connection.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(out, "UTF-8"));
writer.write(parameters);
writer.flush();
writer.close();
out.close();
int responseCode = connection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
output += "Status: True\n";
String line;
InputStream in = new BufferedInputStream(connection.getInputStream());
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
while ((line = reader.readLine()) != null) {
String[] list = line.split(",");
String[] message = list[2].split(":");
output += message[1];
}
reader.close();
}
else{
output += "Status: False\n";
}
postText.setText(output);
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage(output);
builder.setTitle("Magic Number");
builder.setCancelable(true);
builder.setPositiveButton(
"Ok",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
}
);
AlertDialog alert = builder.create();
alert.show();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
});
行。我尝试通过更改textview文本来跟踪问题，发现连接从未发生过。同样，如果我在Visual Studio Code上运行完全相同的代码，它将连接并且可以从服务器获取响应，但是connection.connect()似乎不能在Android Studio上运行。
在有人问之前，我确实在清单文件中授予了Internet许可。