我有一项服务正在运行以获取 API 值并将其存储在 sql lite DB 中。我有一个单独的排球类和一个界面。
class PostVolleyJsonRequest {
private String type;
Service act;
private Service service;
Cryptomain cryptomain;
private VolleyJsonRespondsListener volleyJsonRespondsListener;
private String networkurl;
private JSONObject jsonObject = null;
private JSONObject params;
PostVolleyJsonRequest(Service act, VolleyJsonRespondsListener volleyJsonRespondsListener, String type, String netnetworkUrl, JSONObject params) {
this.act = act;
this.volleyJsonRespondsListener = volleyJsonRespondsListener;
this.type = type;
this.networkurl = netnetworkUrl;
this.params = params;
sendRequest();
}
private void sendRequest() {
JsonObjectRequest jsObjRequest = new JsonObjectRequest(Request.Method.GET, networkurl, params,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
volleyJsonRespondsListener.onSuccessJson(response, type);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
try {
NetworkResponse response = error.networkResponse;
Log.e("response", "response " + response);
if (response != null) {
int code = response.statusCode;
String errorMsg = new String(response.data);
Log.e("response", "response" + errorMsg);
try {
jsonObject = new JSONObject(errorMsg);
} catch (JSONException e) {
e.printStackTrace();
}
String msg = jsonObject.optString("message");
volleyJsonRespondsListener.onFailureJson(code, msg);
} else {
String errorMsg = error.getMessage();
volleyJsonRespondsListener.onFailureJson(0, errorMsg);
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
AppController.getInstance().addToRequestQueue(jsObjRequest);
}
}
我的服务等级：
public class Service extends android.app.Service {
private Timer timer = new Timer();
public Service() throws ClassNotFoundException {
}
@Override
public void onCreate() {
super.onCreate();
timer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
sendRequestToServer(); //Your code here
}
}, 0, 60*1000);//5 Minutes
}
private void sendRequestToServer() {
new PostVolleyJsonRequest(Service.this, Service.this,"Zay","https://www.xxxxxx.com/api", null);
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return super.onStartCommand(intent, flags, startId);
}
}
界面：
public interface VolleyJsonRespondsListener {
public void onSuccessJson(JSONObject result, String type);
public void onFailureJson(int responseCode, String responseMessage);
}
如果我的输入如下所示，我可以在实现接口时在 Service 中接收 json 响应。
new PostVolleyJsonRequest(Service.this, Service.this,"Zay","https://www.xxxxxx.com/api", null);
我需要响应的类：
public class main extends AppCompatActivity implements VolleyJsonRespondsListener{
private List<dispitems> movieList = new ArrayList<dispitems>();
private RecyclerView recyclerView;
private Adapter mAdapter;
List<Note> notes;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list);
startService(new Intent(this, Service.class));
LinearLayoutManager manager = new LinearLayoutManager(this);
manager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(manager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
mAdapter = new Adapter(movieList);
recyclerView.setAdapter(mAdapter);
prepareMovieData();
}
private void prepareMovieData() {
notes = Select.from(Note.class).fetch();
if(!notes.isEmpty()) {
movieList.add(new dispitems(notes.get(0).getBuy(), notes.get(0).getSell()));
}
mAdapter.notifyDataSetChanged();
}
@Override
public void onSuccessJson(JSONObject result, String type) {
//I need the response here
}
@Override
public void onFailureJson(int responseCode, String responseMessage) {
}
}
现在，我想在 Service.this 以外的另一个类中接收响应。我尝试在第二个参数中使用类名，但我收到空指针异常。如何通过实现接口接收其他类的响应？