Question

我想使用volley来构建具有身份验证的http连接。在this answer之后我添加了细分

  @Override
                    public Map<String, String> getHeaders() throws AuthFailureError {
                        HashMap<String, String> params = new HashMap<String, String>();
                        String creds = String.format("%s:%s","USERNAME","PASSWORD");
                        String auth = "Basic " + Base64.encodeToString(creds.getBytes(), Base64.DEFAULT);
                        params.put("Authorization", auth);
                        return params;
                    }

在匿名内部班StringRequest中，它看起来像：

StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
        new Response.Listener<String>() {


//the segment below is what I add 
            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                HashMap<String, String> params = new HashMap<String, String>();
                String creds = String.format("%s:%s","USERNAME","PASSWORD");
                String auth = "Basic " + Base64.encodeToString(creds.getBytes(), Base64.DEFAULT);
                params.put("Authorization", auth);
                return params;
            }

//the segment above is what I add 
            @Override
            public void onResponse(String response) {
                // Display the first 500 characters of the response string.
            }
        }, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
    }
});

但是，IDE提示getHeaders()不会覆盖其超类。

为什么？我发现StringRequest扩展了类Request<String>，而后者确实有一个名为getHeaders()的方法。

Answer 1

您在public Map<String, String> getHeaders()的新实例中覆盖Response.Listener<String>而不是Request<String>而Response.Listener<String>没有此类方法（仅onResponse(String)）。

为什么Android Studio提示“方法不会覆盖其超类”？

1 个答案: