我正在编写一个带有休息API请求的类（Yandex磁盘）。我使用凌空抽射，但从中得到回应确实有一些问题。您可以检查其余的API here。
我使用排球，但可以在调试器中获得响应，但不能在Activity中得到响应。
这是我的Requests班
class Requests {
private String response_of_server, token;
private String url = "https://cloud-api.yandex.net/v1/disk";
private Context context;
Requests (String token, Context context) {
this.token = token;
this.context = context;
}
private void set_response_of_server(String response) {
this.response_of_server = response;
}
String get_response() {
return response_of_server;
}
void get_metadata_of_user() {
try {
/*Request*/
RequestQueue queue = Volley.newRequestQueue(this.context);
Response.ErrorListener error_listener = new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
};
Response.Listener<String> response_listener = new Response.Listener<String>()
{
@Override
public void onResponse(String response) {
set_response_of_server(response);
}
};
StringRequest getRequest = new StringRequest(Request.Method.GET, url+"?fields=user", response_listener, error_listener) {
@Override
public Map<String, String> getHeaders() {
Map<String, String> params = new HashMap<>();
params.put("Host", "cloud-api.yandex.net");
params.put("Authorization", token);
return params;
}
};
queue.add(getRequest);
/*Request end*/
} catch (Exception e) {
e.printStackTrace();
}
}
}
还有MainActivity，我想在此回复。
public class MainActivity extends AppCompatActivity {
private final String ID_OF_APP = "Your token of app";
private final String URL_FOR_CODE_QUERY = "https://oauth.yandex.com/authorize?response_type=token&client_id=" + ID_OF_APP;
private String SAVED_TOKEN = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn_get_code = findViewById(R.id.btn_get_code); // send to get code page (yandex)
btn_get_code.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(URL_FOR_CODE_QUERY));
startActivity(i);
}
});
Button btn_sign_in = findViewById(R.id.btn_sign_in);
btn_sign_in.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
EditText code_field = findViewById(R.id.code_field);
String token = code_field.getText().toString();
save_token(token);
try {
if(check_token()) {
//Toast.makeText(MainActivity.this, "You are successfully signed in", Toast.LENGTH_SHORT).show();
// TODO change activity
}
else {}
} catch (InterruptedException e) {
e.printStackTrace();
}
//Toast.makeText(MainActivity.this, "Something went wrong. Please, check your connection and try again later", Toast.LENGTH_SHORT).show();
}
});
}
private void save_token(String token) {
SharedPreferences sPref = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor ed = sPref.edit();
ed.putString(SAVED_TOKEN, token);
ed.apply();
}
private String load_token() {
SharedPreferences sPref = getPreferences(MODE_PRIVATE);
return sPref.getString(SAVED_TOKEN, "");
}
private boolean check_token() throws InterruptedException {
String token = load_token();
String result;
Requests request = new Requests(token, this);
request.get_metadata_of_user();
result = request.get_response();
Toast.makeText(MainActivity.this, result, Toast.LENGTH_SHORT).show();
return !(result.equals("-1"));
}
}
check_token()函数应该只是随服务器的响应而改变。但是，我无法从服务器返回Toast或任何响应。
答案 0 :(得分：1)
您有一个<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/2.1.2/TweenMax.min.js"></script>
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<div></div>
<h1 id="title">Hello World !</h1>
<div></div>类，该类具有调用服务器API Requests的功能。因此，在Asynchronous函数中调用result之后，您不会立即得到request.get_metadata_of_user();。
因此，我建议您像下面这样修改check_token()类。
Request现在public class Requests {
private String response_of_server, token;
private String url = "https://cloud-api.yandex.net/v1/disk";
private Context context;
private HttpListener listener; // Add a listener to get the callback functionality
Requests (String token, Context context, HttpListener listener) {
this.token = token;
this.context = context;
this.listener = listener; // initialize the listener here
}
private void set_response_of_server(String response) {
this.response_of_server = response;
listener.onResponseReceived(response); // Send the response back to the calling class
}
String get_response() {
return response_of_server;
}
void get_metadata_of_user() {
try {
RequestQueue queue = Volley.newRequestQueue(this.context);
Response.ErrorListener error_listener = new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
};
Response.Listener<String> response_listener = new Response.Listener<String>()
{
@Override
public void onResponse(String response) {
set_response_of_server(response);
}
};
StringRequest getRequest = new StringRequest(Request.Method.GET, url+"?fields=user", response_listener, error_listener) {
@Override
public Map<String, String> getHeaders() {
Map<String, String> params = new HashMap<>();
params.put("Host", "cloud-api.yandex.net");
params.put("Authorization", token);
return params;
}
};
queue.add(getRequest);
} catch (Exception e) {
e.printStackTrace();
}
}
}
类可能如下所示。创建HttpListener并添加以下代码以将其创建为接口。
HttpListener.java因此，您需要像下面这样在public interface HttpListener {
public void onResponseReceived();
}
中实现此interface。
MainActivity请注意，该代码未经测试。请根据您的要求进行修改。我希望这可以帮助您理解问题。