我怎樣才能從onResponse返回值onCreate？

Question

如何從onResponse()凌空退回onCreate()？

在波紋管源代碼中，我需要返回jsonInstagramList到onCreate()。

public class MainActivity extends Activity { 
    private static final String ENDPOINT = "https://......."; 

    private RequestQueue requestQueue; 
    private Gson gson; 
    private RecyclerView start_recyclerView; 
    private Adapter mAdapter; 
    protected Handler handler; 
    private List<JsonInstagram> jsonInstagramList; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     start_recyclerView = (RecyclerView) findViewById(R.id.start_recyclerView); 
     start_recyclerView.setLayoutManager(new LinearLayoutManager(this)); 
     start_recyclerView.setItemAnimator(new DefaultItemAnimator()); 

     requestQueue = Volley.newRequestQueue(getApplicationContext()); 
     GsonBuilder gsonBuilder = new GsonBuilder(); 
     gsonBuilder.setDateFormat("M/d/yy hh:mm a"); 
     gson = gsonBuilder.create(); 

     fetchPosts(); 

    } 

    private void fetchPosts() { 
     StringRequest request = new StringRequest(Request.Method.GET, ENDPOINT, onPostsLoaded, onPostsError); 
     requestQueue.add(request); 
    } 



    private final Response.Listener<String> onPostsLoaded = new Response.Listener<String>() { 
     @Override 
     public void onResponse(String response) { 
      Document doc = Jsoup.parse(response); 
      Element links = doc.select("script").get(3); 
      String content = links.html(); 
      String res1 = content.replaceAll("window._sharedData = ", ""); 
      String finalRes = res1.replaceAll("\\}\\;", "}"); 

      jsonInstagramList = Collections.singletonList(gson.fromJson(finalRes, JsonInstagram.class)); 
      mAdapter = new Adapter(
        jsonInstagramList.get(0).getEntryData().getProfilePage().get(0).getUser().getMedia().getNodes(), 
        start_recyclerView 
      ); 
      start_recyclerView.setAdapter(mAdapter); 

     } 
    }; 

    private final Response.ErrorListener onPostsError = new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      Log.e(MainActivity.class.getSimpleName(), error.toString()); 
     } 
    }; 
} 

Answer 1

你不能，onResponse（）是一個回調方法，用於異步請求，一旦請求完成就會被調用，所以你不能從那裏返回一個值。

但是你可以做任何你想從裏面onResponse()與jsonInstagramList做，或者你可以撥打您要它來對付另一種方法jsonInstagramList

例如：

public void onResponse(){ 
//...code ... 
    doSomething(jsonInstagramList); 
}