我正在尝试从 GET
请求发送一些身份验证 header ,我尝试使用 Volley JsonObjectRequest
调用:
Map<String,String> params=new HashMap<String,String>();
params.put("token","fghjbvjhnjjk");
activity.showDialog();
JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET,url,
new JSONObject(params), new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Log.d(tag, response.toString());
activity.hideDialog();
try {
activity.onRequestServed(response, code);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(tag, "Error: " + error.getMessage());
Log.e(tag, "Site Info Error: " + error.getMessage());
Toast.makeText(activity.getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
activity.hideDialog();
try {
activity.onRequestServed(null,code);
} catch (JSONException e) {
e.printStackTrace();
}
}
});
req.setShouldCache(true);
但它显示:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.hashCode()' on a null object reference
at com.android.volley.Request.<init>(Request.java:136)
at com.android.volley.toolbox.JsonRequest.<init>(JsonRequest.java:58)
at com.android.volley.toolbox.JsonObjectRequest.<init>(JsonObjectRequest.java:47)
我在某处读到,您可以通过制作 hashmap
来传递 header ,从而使用该参数创建一个新的 JsonObject
。也许这将适用于 POST
请求。请帮助..
最佳答案
嗯,事情很简单,也很精确。将 header 传递给 GET 或 POST 请求,您需要重写 JsonObjectRequest 类中的 getHeaders 方法。它将如何完成:
JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET,url,
null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Log.d(tag, response.toString());
activity.hideDialog();
try {
activity.onRequestServed(response, code);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(tag, "Error: " + error.getMessage());
Log.e(tag, "Site Info Error: " + error.getMessage());
Toast.makeText(activity.getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
activity.hideDialog();
try {
activity.onRequestServed(null,code);
} catch (JSONException e) {
e.printStackTrace();
}
}
}) {
/**
* Passing some request headers
*/
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
HashMap<String, String> headers = new HashMap<String, String>();
//headers.put("Content-Type", "application/json");
headers.put("key", "Value");
return headers;
}
};
关于android - Volley JsonObjectRequest 在 GET 请求中发送 header ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35218464/