我收到此錯誤，同時實施刷卡刷新佈局

Question

我收到以下錯誤我

setOnRefreshListener （android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener） 在SwipeRefreshLayout不能應用於 到 （in.com .goalert.activity.MainActivity）

在

swipeRefreshLayout.setOnRefreshListener(this); 

全碼低於

public class MainActivity extends AppCompatActivity { 
    private static final String TAG = MainActivity.class.getSimpleName(); 
    private DrawerLayout drawerLayout; 
    private Toolbar toolbar; 
    private SessionManager pref; 
    private SQLiteHandler db; 
    private ListView listView; 
    private FeedListAdapter listAdapter; 
    public static List<FeedItem> feedItems =new ArrayList<>(); 
    private SwipeRefreshLayout swipeRefreshLayout; 
    private String URL_FEED = "http://api.androidhive.info/feed/feed.json"; 
    static int count = 0; 
    @SuppressLint("NewApi") 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     listView = (ListView) findViewById(R.id.list); 
     toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 
     initNavigationDrawer(); 
     listAdapter = new FeedListAdapter(this, feedItems); 
     listView.setAdapter(listAdapter); 
     pref = new SessionManager(getApplicationContext()); 
     db = new SQLiteHandler(getApplicationContext()); 
     swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout); 
     swipeRefreshLayout.setOnRefreshListener(this); 




     // We first check for cached request 
     Cache cache = AppController.getInstance().getRequestQueue().getCache(); 
     Entry entry = cache.get(URL_FEED); 

     if (entry != null) { 
      // fetch the data from cache 
      try { 
       String data = new String(entry.data, "UTF-8"); 
       try { 
        parseJsonFeed(new JSONObject(data)); 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
      } catch (UnsupportedEncodingException e) { 
       e.printStackTrace(); 
      } 

     }else { 
      // making fresh volley request and getting json 
      JsonObjectRequest jsonReq = new JsonObjectRequest(Method.GET, 
        URL_FEED, null, new Response.Listener<JSONObject>() { 

       @Override 
       public void onResponse(JSONObject response) { 
        VolleyLog.d(TAG, "Response: " + response.toString()); 
        if (response != null) { 
         parseJsonFeed(response); 
        } 
       } 
      }, new Response.ErrorListener() { 

       @Override 
       public void onErrorResponse(VolleyError error) { 
        VolleyLog.d(TAG, "Error: " + error.getMessage()); 
       } 
      }); 

      // Adding request to volley request queue 
      AppController.getInstance().addToRequestQueue(jsonReq); 
     } 

    } 



    public void onRefresh() { 
     Log.i("onRefresh","onRefresh"); 
     fetchfeed(); 
    } 

    private void fetchfeed() { 
     Log.i("fetchfeed","fetchfeed"); 
     String URL_FEED = "http://www.goalert.in/feed/engineering.json"; 
     swipeRefreshLayout.setRefreshing(true); 

     JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.GET, 
       URL_FEED, null, new Response.Listener<JSONObject>() { 

      @Override 
      public void onResponse(JSONObject response) { 
       VolleyLog.d("Response",response.toString()); 
       if (response != null) { 
        swipeRefreshLayout.setRefreshing(false); 

        parseJsonFeed(response); 
       } 
       swipeRefreshLayout.setRefreshing(false); 

      } 
     }, new Response.ErrorListener() { 

      @Override 
      public void onErrorResponse(VolleyError error) { 
       VolleyLog.d("", "Error: " + error.getMessage()); 
      } 
     }); 
     AppController.getInstance().addToRequestQueue(jsonReq); 

     // Adding request to volley request queue 
     //AppController.getInstance().addToRequestQueue(jsonReq); 
     // showing refresh animation before making http call 

    } 

    private void parseJsonFeed(JSONObject response) { 
     try { 
      JSONArray feedArray = response.getJSONArray("feed"); 

      for (int i = 0; i < feedArray.length(); i++) { 
       JSONObject feedObj = (JSONObject) feedArray.get(i); 

       FeedItem item = new FeedItem(); 
       item.setId(feedObj.getInt("id")); 
       item.setName(feedObj.getString("name")); 

       // Image might be null sometimes 
       String image = feedObj.isNull("image") ? null : feedObj 
         .getString("image"); 
       item.setImge(image); 
       item.setStatus(feedObj.getString("status")); 
       item.setProfilePic(feedObj.getString("profilePic")); 
       item.setTimeStamp(feedObj.getString("timeStamp")); 

       // url might be null sometimes 
       String feedUrl = feedObj.isNull("url") ? null : feedObj 
         .getString("url"); 
       item.setUrl(feedUrl); 

       feedItems.add(item); 
      } 

      // notify data changes to list adapater 
      listAdapter.notifyDataSetChanged(); 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 
    } 

Answer 1

您可以嘗試使用下面的代碼swipeRefreshLayout此代碼是爲我工作。

這是SwipeRefreshLayout XML代碼snippiest。

<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/swipe_refresh_layout" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"> 

    <ListView 
     android:id="@+id/list" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:divider="@null" 
     android:dividerHeight="0dp" /> 
</android.support.v4.widget.SwipeRefreshLayout> 

這裏是Java代碼snippiest看起來像按您的要求或代碼

final SwipeRefreshLayout swipeView = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout); 

swipeView.setEnabled(false); 
swipeView.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { 
     @Override 
     public void onRefresh() { 
      swipeView.setRefreshing(true); 
      (new Handler()).postDelayed(new Runnable() { 
       @Override 
       public void run() { 
        swipeView.setRefreshing(false); 
        try { 
         onRefresh(); 
        } catch (Exception e) { 
         e.printStackTrace(); 
        } 
       } 
      }, 3000); 
     } 
    }); 
    // user defined on-refresh method 
private void onRefresh() { 
    Log.i("onRefresh","onRefresh"); 
    fetchfeed(); 
} 

private void fetchfeed() { 
    Log.i("fetchfeed","fetchfeed"); 
    String URL_FEED = "http://www.goalert.in/feed/engineering.json"; 

    JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.GET, 
      URL_FEED, null, new Response.Listener<JSONObject>() { 
     @Override 
     public void onResponse(JSONObject response) { 
      VolleyLog.d("Response",response.toString()); 
      if (response != null) { 
       parseJsonFeed(response); 
      } 
     } 
    }, new Response.ErrorListener() { 

     @Override 
     public void onErrorResponse(VolleyError error) { 
      VolleyLog.d("", "Error: " + error.getMessage()); 
     } 
    }); 
    AppController.getInstance().addToRequestQueue(jsonReq); 
} 

仍然可以使用你的代碼按您的要求。

我建議嘗試使用此解決方案。它會工作

Answer 2

你必須 與android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener

Answer 3

我的問題得到解決落實在MainActivity做

implements SwipeRefreshLayout.OnRefreshListener