onRefresh Android SwipeRefreshLayout不打電話給我的方法

Question

我正在學習android刷卡刷新佈局。我在swipeRefreshLayout「setRefreshing（true）」上發佈runabble，然後在方法onRefresh上，我寫了fetchMovie（）。但fetchMovie（）沒有調用。如何解決它？

package com.example.zihadrizkyef.belajarswiperefresh; 

import android.support.v4.widget.SwipeRefreshLayout; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ListView; 
import android.widget.Toast; 

import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.toolbox.JsonArrayRequest; 
import com.example.zihadrizkyef.belajarswiperefresh.app.MyApplication; 
import com.example.zihadrizkyef.belajarswiperefresh.helper.Movie; 
import com.example.zihadrizkyef.belajarswiperefresh.helper.SwipeListAdapter; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.util.ArrayList; 
import java.util.List; 

public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener { 
    private String TAG = MainActivity.class.getSimpleName(); 
    private String URL_TOP_250 = "http://api.androidhive.info/json/imdb_top_250.php?offset="; 
    private SwipeRefreshLayout swipeRefreshLayout; 
    private ListView listView; 
    private SwipeListAdapter adapter; 
    private List<Movie> movieList; 
    private int offSet = 0; 

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

     listView = (ListView) findViewById(R.id.listView); 
     swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout); 

     movieList = new ArrayList<Movie>(); 
     adapter = new SwipeListAdapter(this, movieList); 
     listView.setAdapter(adapter); 
     listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       Toast.makeText(MainActivity.this, "aaaaaaaaaa", Toast.LENGTH_SHORT).show(); 
      } 
     }); 

     swipeRefreshLayout.setOnRefreshListener(this); 

     swipeRefreshLayout.post(new Runnable() { 
      @Override 
      public void run() { 
       swipeRefreshLayout.setRefreshing(true); 
      } 
     }); 
    } 

    @Override 
    public void onRefresh() { 
     fetchMovie(); 
    } 

    private void fetchMovie() { 
     swipeRefreshLayout.setRefreshing(true); 
     String url = URL_TOP_250+offSet; 

     JsonArrayRequest req = new JsonArrayRequest(url, new Response.Listener<JSONArray>() { 
      @Override 
      public void onResponse(JSONArray response) { 
       System.out.println(TAG+response.toString()); 

       if (response.length() > 0) { 
        for (int i=0; i<=response.length(); i++) { 
         try { 
          JSONObject movieObject = response.getJSONObject(i); 
          int rank = movieObject.getInt("rank"); 
          String title = movieObject.getString("title"); 

          Movie movie = new Movie(rank, title); 
          movieList.add(0, movie); 

          if (rank > offSet) { 
           offSet = rank; 
          } 
         } catch (JSONException e) { 
          System.out.println(TAG + " : JSON Parsing error : "+e.getMessage()); 
         } 
        } 
        adapter.notifyDataSetChanged(); 
       } 
       swipeRefreshLayout.setRefreshing(false); 
      } 
     }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       System.out.println(TAG+" : Server error : "+error.getMessage()); 
       Toast.makeText(MainActivity.this, error.getMessage(), Toast.LENGTH_SHORT).show(); 
       swipeRefreshLayout.setRefreshing(false); 
      } 
     }); 

     MyApplication.getInstance().addToRequestQueue(req); 
    } 
} 

Answer 1

正如所看到的有關SwipeRefreshLayout文檔中：

如果活動希望只顯示進度動畫，它應該調用setRefreshing（真）。

調用setRefreshing（）不會呼叫OnRefreshListener。

swipeRefreshLayout.post(new Runnable() { 
      @Override 
      public void run() { 
       swipeRefreshLayout.setRefreshing(true); 
       fetchMovie(); 
      } 
     }); 

相關文件：你可以以後它雖然叫fetchMovie（）https://developer.android.com/reference/android/support/v4/widget/SwipeRefreshLayout.html