Question

所有。我正在使用排球来向我的网站服务器发出http请求。当单击提交按钮向请求队列添加请求时，它工作正常并且响应。但再次单击该按钮不响应。它仍然显示progressdialog和响应没有。有什么不对吗？

以下是代码示例：

public class MainActivity extends ActionBarActivity {
private static final String URL = "http://www.google.com";

public RequestQueue mQueue = null;
public StringRequest request = null;

private Button mScanButton = null;
private TextView mDisplay = null;

private ProgressDialog dialog = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mScanButton = (Button) findViewById(R.id.button_scan);
    mDisplay = (TextView) findViewById(R.id.display);



    request = new StringRequest(Request.Method.GET, URL,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    System.out.println("Response retrieved");
                    mDisplay.setText(response);
                    dialog.dismiss();
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    mDisplay.setText("That didn't work.");
                    dialog.dismiss();
                }
            });
    request.setShouldCache(false);

    mScanButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog = ProgressDialog.show(MainActivity.this, "Mapping data", "please wait..");

            mQueue = Volley.newRequestQueue(MainActivity.this);
            mQueue.add(request);
            System.out.println("Add to queue..");
        }
    });

}

Answer 1

尝试this这里的指南可以帮助您轻松理解。

看这一行

if (ServerConfig.isNetworkOnline(SplashScreen.this)) {
        StringRequest strReq = new StringRequest(Request.Method.POST, "your server link", serverResponse, errorListener) {
        };
        AppController.getInstance().getRequestQueue().add(strReq);
    } else {
        Toast.makeText(getApplicationContext(), "Please check your network connection", Toast.LENGTH_SHORT).show();
        finish();
    }

您可以使用以下代码删除上面的代码。

StringRequest strReq = new StringRequest(Request.Method.POST, "your server link", serverResponse, errorListener) {
            };
            AppController.getInstance().getRequestQueue().add(strReq);

Answer 2

我尝试将请求声明区域移动到on-click方法，它工作正常。但我仍然不明白它是如何运作的。

public class MainActivity extends ActionBarActivity {
private static final String URL = "http://www.google.com";

public RequestQueue mQueue = null;
public StringRequest request = null;

private Button mScanButton = null;
private TextView mDisplay = null;

private ProgressDialog dialog = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mScanButton = (Button) findViewById(R.id.button_scan);
    mDisplay = (TextView) findViewById(R.id.display);

    mScanButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog = ProgressDialog.show(MainActivity.this, "Mapping data", "please wait..");

            request = new StringRequest(Request.Method.GET, URL,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    System.out.println("Response retrieved");
                    mDisplay.setText(response);
                    dialog.dismiss();
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    mDisplay.setText("That didn't work.");
                    dialog.dismiss();
                }
            });

            mQueue = Volley.newRequestQueue(MainActivity.this);
            mQueue.add(request);
            System.out.println("Add to queue..");
        }
    });

}

android Volley再次请求时不响应

2 个答案: