Question

我正在尝试在Android Studio中开发应用。我陷入了这种境地。我使用AsyncHttp客户端从MySQL数据库中获取表名列表。我在UI活动中调用以下函数来填充Spinner中的值。但是我无法返回值。该值在内部类中以及返回类型为void的重写方法内部检索。请查看代码以进一步了解。

public void fetchAvailableLocations ()
{
    AsyncHttpClient httpClient = new AsyncHttpClient();
    RequestParams requestParams = new RequestParams();

    String _URL = ""; // Enter URL here

    byte[] retreivedBytes;

    httpClient.post(_URL, requestParams, responseHandler, new AsyncHttpResponseHandler() {


        @Override
        public void onSuccess(int i, cz.msebera.android.httpclient.Header[] headers, byte[] bytes) {
            retrievedBytes = bytes; //This is where I'm stuck

        }

        @Override
        public void onFailure(int i, cz.msebera.android.httpclient.Header[] headers, byte[] bytes, Throwable throwable) {
           //make toasts 
        }
    });
}

一个解决方案我想到的是在UI活动中创建一个静态字段，创建一个以字节为参数的回调函数，并将静态字段分配给bytes参数然后调用它来自onSuceed方法。但这条路线看起来很难看。有更简单的方法吗？

我对Android编程有点新意，所以请帮忙。

Answer 1

而不是扩展使用继承：

public class fetchAvailableLocationsClass implements AsyncHttpResponseHandler {

    public void fetchAvailableLocations() {
        AsyncHttpClient httpClient = new AsyncHttpClient();
        RequestParams requestParams = new RequestParams();

        String _URL = ""; // Enter URL here

        byte[] retreivedBytes;

        httpClient.post(_URL, requestParams, responseHandler, this);


        @Override
        public void onSuccess ( int i, cz.msebera.android.httpclient.Header[] headers, byte[] bytes)
        {
            retrievedBytes = bytes; //This is where I'm stuck

        }

        @Override
        public void onFailure ( int i, cz.msebera.android.httpclient.Header[] headers,
        byte[] bytes, Throwable throwable){
            //make toasts
        }

    }
}

从内部类

1 个答案: