从按钮发送的每个请求都会收到相同的响应

Question

MainActivity中使用了以下代码：

StringBuilder stringBuilder = new StringBuilder();
Cache cache;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    buttonDiscard = findViewById(R.id.buttonDiscard);

    RequestQueue requestQueue;
    cache = new DiskBasedCache(getCacheDir(), 1024 * 1024); // 1MB cap
    Network network = new BasicNetwork(new HurlStack());
    requestQueue = new RequestQueue(cache, network);
    requestQueue.start();
    String url ="https://www.themealdb.com/api/json/v1/1/random.php";
    StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
            stringBuilder::append,
            error -> System.out.println("Error occurred"));
    requestQueue.add(stringRequest);
}
public void handleDiscardClick(View view){
    System.out.println(stringBuilder);
}

我面临的问题是，每次单击 url 按钮时，我都会收到相同的字符串响应，该按钮以 json 格式提供随机餐点。我可以获得不同字符串的唯一方法是每次重新启动 android 应用程序，这绝对不好。我尝试在按钮功能内移动网络代码，但我仍然收到相同的响应。如果有人能告诉我如何在每次单击按钮时获得不同的响应，我将不胜感激。（抱歉，我是 android 网络新手）

Answer 1

我最终修改了整个代码。我在另一个 class 中编写了以下代码并且运行良好：

public class NetworkController {
StringBuilder stringBuilder = new StringBuilder();
private final RequestQueue queue;

public StringBuilder getstringBuilder() {
    return stringBuilder;
}

public void setModelFromNetwork() {
    final String url = "https://www.themealdb.com/api/json/v1/1/random.php";
    StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
            response -> {
                try {
                    stringBuilder.append(response.toString());
                } catch (JSONException e) {
                    System.out.println("JSONException occurred. The error is: ");
                    e.printStackTrace();
                }
            }, exception -> System.out.println("Error"));
    queue.add(stringRequest);
}

public NetworkController(@NonNull final Activity activity) {
    queue = Volley.newRequestQueue(activity.getApplicationContext());
}
}

从按钮发送的每个请求都会收到相同的响应

Same responses are received for every request sent from button

java

networking

android

android-networking

android-studio