附帶parce.com.no適配器的Android應用程序;跳過佈局

Question

有我的code.The問題是，當我改變方向我有sucha線：沒有適配器連接;跳過layout.Marked紅色colour.But後附加一些毫秒的佈局。所以我想知道是否可以，或者我應該改變我的代碼莫名其妙？

package by.test.roma.myapplication; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.Toast; 

import com.parse.FindCallback; 
import com.parse.GetCallback; 
import com.parse.Parse; 
import com.parse.ParseException; 
import com.parse.ParseObject; 
import com.parse.ParseQuery; 

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

public class MainActivity extends AppCompatActivity { 
    RecyclerView recyclerView; 
    LinearLayoutManager manager; 
    List<Recipe> recipes; 
    static int count = 0; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     recipes = new ArrayList<Recipe>(); 

     // Enable Local Datastore. 
     if(count == 0) { 
      Parse.enableLocalDatastore(this); 
      Parse.initialize(this, "id", "key"); 
      count++; 
     } 
     ParseQuery<ParseObject> query = ParseQuery.getQuery("Recipes"); 
     query.findInBackground(new FindCallback<ParseObject>() { 
      public void done(List<ParseObject> recipesList, ParseException e) { 
       if (e == null) { 
        Log.d("score", "Retrieved " + recipesList.size() + " recipes"); 
        for(ParseObject obj :recipesList) { 
         initializeData(obj); 
       } 
       } else { 
        Log.d("score", "Error: " + e.getMessage()); 
       } 
       initializeAdapter(); 
      } 
     }); 

     setContentView(R.layout.activity_main); 
     recyclerView = (RecyclerView)findViewById(R.id.recyclerView); 
     manager = new LinearLayoutManager(getApplicationContext()); 
     recyclerView.setHasFixedSize(true); 
     recyclerView.setLayoutManager(manager); 

     //initializeData(); 



    } 

    @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); 
    } 
    private void initializeAdapter(){ 
     RVAdapter adapter = new RVAdapter(recipes); 
     recyclerView.setAdapter(adapter); 
    } 
    private void initializeData(ParseObject obj){ 
     recipes.add(new Recipe(obj.getString("Description"), obj.getString("shortDescription"), obj.getString("Name"), R.drawable.share)); 
     Log.d("score", Integer.toString(recipes.size())); 
    } 
} 



My log : 
08-28 14:04:28.913 14256-14256/by.test.roma.myapplication D/﹕ mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Fri May 4 10:32:42 KST 2012 
08-28 14:04:28.948 14256-14256/by.test.roma.myapplication D/OpenGLRenderer﹕ Enabling debug mode 0 
08-28 14:04:28.948 14256-14256/by.test.roma.myapplication E/RecyclerView﹕ No adapter attached; skipping layout 
08-28 14:04:28.983 14256-14256/by.test.roma.myapplication E/RecyclerView﹕ No adapter attached; skipping layout 
08-28 14:04:29.058 14256-14256/by.test.roma.myapplication D/CLIPBOARD﹕ Hide Clipboard dialog at Starting input: finished by someone else... ! 
08-28 14:04:29.573 14256-14256/by.test.roma.myapplication D/score﹕ Retrieved 2 recipes 
08-28 14:04:29.573 14256-14256/by.test.roma.myapplication D/score﹕ 1 
08-28 14:04:29.573 14256-14256/by.test.roma.myapplication D/score﹕ 2 
08-28 14:04:29.603 14256-14257/by.test.roma.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 299K, 8% free 13141K/14215K, paused 2ms+2ms 
08-28 14:04:29.618 14256-14256/by.test.roma.myapplication D/dalvikvm﹕ GC_FOR_ALLOC freed 4K, 8% free 13239K/14343K, paused 13ms 
08-28 14:04:29.618 14256-14256/by.test.roma.myapplication I/dalvikvm-heap﹕ Grow heap (frag case) to 14.041MB for 417616-byte allocation 
08-28 14:04:29.633 14256-14256/by.test.roma.myapplication D/dalvikvm﹕ GC_FOR_ALLOC freed <1K, 8% free 13646K/14791K, paused 13ms 
08-28 14:04:43.178 14256-14256/by.test.roma.myapplication D/OpenGLRenderer﹕ Flushing caches (mode 0) 
08-28 14:04:43.418 14256-14256/by.test.roma.myapplication E/RecyclerView﹕ No adapter attached; skipping layout 
08-28 14:04:43.428 14256-14256/by.test.roma.myapplication E/RecyclerView﹕ No adapter attached; skipping layout 
08-28 14:04:43.578 14256-14256/by.test.roma.myapplication D/score﹕ Retrieved 2 recipes 
08-28 14:04:43.578 14256-14256/by.test.roma.myapplication D/score﹕ 1 
08-28 14:04:43.578 14256-14256/by.test.roma.myapplication D/score﹕ 2 
. 
. 
. 

Answer 1

您需要創建和設置您的適配器爲RecyclerView要繪製：

setContentView(R.layout.activity_main); 
    recyclerView = (RecyclerView)findViewById(R.id.recyclerView); 
    manager = new LinearLayoutManager(getApplicationContext()); 
    recyclerView.setHasFixedSize(true); 
    recyclerView.setLayoutManager(manager); 
    // initialize your array and set an adapter even if its empty to avoid the 
    // skipping layout warning 
    recipes = new ArrayList<>(); 
    RVAdapter adapter = new RVAdapter(recipes); 
    recyclerView.setAdapter(adapter); 

然後，一旦你取，並添加您的數據：

adapter.notifyDataSetChanged(); 

或更有效：

adapter.notifyItemInserted(positionOfItem);