拉動刷新與回收視圖不起作用

Question

當我移動我的設備下的屏幕刷新RSS新聞飼料，它不起作用。我試圖用swiperefreshlayout來刷新新聞。我不知道爲什麼，但它不工作：

主要活動：

public class MainActivity extends AppCompatActivity { 
    RecyclerView recyclerView; 
    SwipeRefreshLayout refreshLayout; 

    private LinearLayoutManager linearLayoutManager; 
    private MyAdapter myRecyclerViewAdapter; 

    Context context; 
    ArrayList<FeedItem> feedItems=new ArrayList<FeedItem>(); 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     refreshLayout=(SwipeRefreshLayout)findViewById(R.id.swipeLayout); 
     refreshLayout.setOnRefreshListener((SwipeRefreshLayout.OnRefreshListener) context); 
     refreshLayout.setColorSchemeColors(0, 0, 0, 0); 
     refreshLayout.setProgressBackgroundColor(android.R.color.transparent); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 
     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 
     recyclerView= (RecyclerView) findViewById(R.id.recyclerView); 
     ReadRss readRss=new ReadRss(this,recyclerView); 
     readRss.execute(); 



     recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() { 
      @Override 
      public void onScrolled(RecyclerView recyclerView, int dx, int dy) { 
       int topRowVerticalPosition = 
         (recyclerView == null || recyclerView.getChildCount() == 0) ? 0 : recyclerView.getChildAt(0).getTop(); 
       refreshLayout.setEnabled(topRowVerticalPosition >= 0); 
       refreshLayout.setEnabled(linearLayoutManager.findFirstCompletelyVisibleItemPosition() == 0); 

      } 

      @Override 
      public void onScrollStateChanged(RecyclerView recyclerView, int newState) { 
       super.onScrollStateChanged(recyclerView, newState); 
      } 
     }); 
     /*recyclerView= (RecyclerView) findViewById(R.id.recyclerview); 
     linearLayoutManager = 
       new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false); 
     myRecyclerViewAdapter = new MyAdapter(context,feedItems); 
     //myRecyclerViewAdapter.setOnItemClickListener(this); 
     recyclerView.setAdapter(myRecyclerViewAdapter); 
     recyclerView.setLayoutManager(linearLayoutManager);*/ 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
} 

內容的main.xml：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 

    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:context="com.example.rssreader.MainActivity" 
    tools:showIn="@layout/activity_main"> 

    <android.support.v4.widget.SwipeRefreshLayout 
     android:id="@+id/swipeLayout" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <android.support.v7.widget.RecyclerView 
      android:id="@+id/recyclerView" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:scrollbars="vertical" /> 

    </android.support.v4.widget.SwipeRefreshLayout> 
</RelativeLayout> 

Answer 1

您已經定義在refreshLayoutsetOnRefreshListener但沒有付諸實施。

你必須在你的刷卡刷新佈局上使用setOnRefreshListener方法。

refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { 
      @Override 
      public void onRefresh() { 
       // call your Refresh method here 
       mswipeRefreshLayout.setRefreshing(false); 
      } 
}); 

Answer 2

你必須設置OnRefreshListener到SwipeRefreshListener和處理在回調中刷新。

mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() 
     { 
      @Override 
      public void onRefresh() 
      { 
       // handle your refresh logic 
      } 
     });