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RecyclerViewエンドレススクロールビュー

2016-07-08 7 views
1

私はrecylerviewをエンドレスなリストビューで実装しようとしました。アンドロイドで。すべて正常に動作しています。別のスレッドであり、しばらくの間スリープしていたスクロールリスナーのハンドラでasynctaskを再び呼び出しましたが、その場合はハンドラの呼び出しをすべて呼びたくありません。その場合、ボトムにプログレスバーが表示されません非常に高速で表示されません。どのように私はこれを達成することができる、親切に私をお勧めします。RecyclerViewエンドレススクロールビュー

これは私のメインactivity.java

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.os.Handler; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.View; 
import android.widget.TextView; 

import org.apache.http.HttpResponse; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 
import java.util.List; 

public class MainActivity extends AppCompatActivity { 

    private Toolbar toolbar; 
    Activity _activity; 
    private String jsonResult; 
    boolean loadingMore = false; 
    ProgressDialog progress; 
    private TextView tvEmptyView; 
    private RecyclerView mRecyclerView; 
    private DataAdapter mAdapter; 
    private LinearLayoutManager mLayoutManager; 

    private List<Student> dataArrayList; 
    private LoadJsonData loadJsonData; 
    protected Handler handler; 
    private int count; 
    private static final String TAG = MainActivity.class.getSimpleName(); 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     toolbar = (Toolbar) findViewById(R.id.toolbar); 
     progress = new ProgressDialog(this); 
     _activity = this; 
     loadJsonData = new LoadJsonData(); 
     tvEmptyView = (TextView) findViewById(R.id.empty_view); 
     mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view); 
     dataArrayList = new ArrayList<Student>(); 
     handler = new Handler(); 
     if (toolbar != null) { 
      setSupportActionBar(toolbar); 
      getSupportActionBar().setTitle("Android Endless Scrollling data "); 

     } 

//  loadData(); 
     if (dataArrayList.isEmpty()) { 
      loadJsonData.execute(); 
     } 

     // use this setting to improve performance if you know that changes 
     // in content do not change the layout size of the RecyclerView 
     mRecyclerView.setHasFixedSize(true); 

     mLayoutManager = new LinearLayoutManager(this); 

     // use a linear layout manager 
     mRecyclerView.setLayoutManager(mLayoutManager); 

     // create an Object for Adapter 
     mAdapter = new DataAdapter(dataArrayList, mRecyclerView); 

     // set the adapter object to the Recyclerview 
     mRecyclerView.setAdapter(mAdapter); 
     // mAdapter.notifyDataSetChanged(); 


     if (dataArrayList.isEmpty() && count > 0) { 
      mRecyclerView.setVisibility(View.GONE); 
      tvEmptyView.setVisibility(View.VISIBLE); 

     } else { 
      mRecyclerView.setVisibility(View.VISIBLE); 
      tvEmptyView.setVisibility(View.GONE); 
     } 

     mAdapter.setOnLoadMoreListener(new OnLoadMoreListener() { 
      @Override 
      public void onLoadMore() { 
//    //add null , so the adapter will check view_type and show progress bar at bottom 
       dataArrayList.add(null); 
       mAdapter.notifyItemInserted(dataArrayList.size()); 
// 
       handler.postDelayed(new Runnable() { 
        @Override 
        public void run() { 
//      // remove progress item 
//      studentList.remove(studentList.size() - 1); 
//      mAdapter.notifyItemRemoved(studentList.size()); 
//      //add items one by one 
//      int start = studentList.size(); 
//      int end = start + 20; 
         new LoadJsonData().execute(); 
//      for (int i = start + 1; i <= end; i++) { 
//       studentList.add(new Student("Student " + i, "AndroidStudent" + i + "@gmail.com")); 
//       mAdapter.notifyItemInserted(studentList.size()); 
//      } 
//      mAdapter.setLoaded(); 
         //or you can add all at once but do not forget to call mAdapter.notifyDataSetChanged(); 
        } 
       }, 1000); 


      } 
     }); 

    } 

    private class LoadJsonData extends AsyncTask<Void, Void, String> { 
     //  ProgressDialog progress; 
     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      if (dataArrayList.size() == 0) { 

       progress = ProgressDialog.show(_activity, "Progress", 
         "Please wait", true); 
      } else { 
       dataArrayList.remove(dataArrayList.size() - 1); 
//    mAdapter.notifyItemRemoved(dataArrayList.size()-); 
      } 

     } 

     @Override 
     protected String doInBackground(Void... params) { 
      String jsonResult = ""; 
      loadingMore = true; 
//   lv.removeFooterView(footerView); 
//   jsonResult=get("https://datatables.net/examples/server_side/scripts/server_processing.php"); 
//   return jsonResult; 
      InputStream inputStream = null; 
      String result = ""; 
      try { 
       HttpClient httpclient = new DefaultHttpClient(); 
       HttpGet request = new HttpGet("https://datatables.net/examples/server_side/scripts/server_processing.php"); 

       HttpResponse httpResponse = httpclient.execute(request); 
       inputStream = httpResponse.getEntity().getContent(); 
       if (inputStream != null) { 
        jsonResult = convertInputStreamToString(inputStream); 
       } else { 
        jsonResult = "Did not work!"; 
       } 
      } catch (Exception e) { 
       Log.e(TAG, "GET failed", e); 
      } 

      return jsonResult; 
     } 

     @Override 
     protected void onPostExecute(String result) { 
      super.onPostExecute(result); 
      progress.dismiss(); 
      try { 
       JSONObject dataJsontObject = new JSONObject(result); 
       JSONArray dataJsonArray = dataJsontObject.getJSONArray("data"); 
       for (int i = 0; i < dataJsonArray.length(); i++) { 
        JSONArray dataSubArray = dataJsonArray.getJSONArray(i); 

        Student dataObject = new Student(); 
        dataObject.setName((String) dataSubArray.get(0)); 
        dataObject.setType((String) dataSubArray.get(1)); 
        dataObject.setProfession((String) dataSubArray.get(2)); 
        dataObject.setCountry((String) dataSubArray.get(3)); 
        dataObject.setCurrency((String) dataSubArray.get(5)); 

//     handler.postDelayed(new Runnable() { 
//     @Override 
//     public void run() { 
//      // remove progress item 
//      studentList.remove(studentList.size() - 1); 
//      mAdapter.notifyItemRemoved(studentList.size()); 
//      //add items one by one 
//      int start = studentList.size(); 
//      int end = start + 20; 
// 
//      for (int i = start + 1; i <= end; i++) { 
//       studentList.add(new Student("Student " + i, "AndroidStudent" + i + "@gmail.com")); 
//       mAdapter.notifyItemInserted(studentList.size()); 
//      } 
//      mAdapter.setLoaded(); 
//      //or you can add all at once but do not forget to call mAdapter.notifyDataSetChanged(); 
//     } 
//    }, 2000); 
//     lv.addFooterView(footerView); 
        dataArrayList.add(dataObject); 
        mAdapter.notifyItemInserted(dataArrayList.size()); 

       } 
       count++; 
       mAdapter.setLoaded(); 
//    mAdapter.notifyDataSetChanged(); 
       loadingMore = false; 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 

     } 
    } 


    // load initial data 
// private void loadData() { 
// 
////  for (int i = 1; i <= 20; i++) { 
////   studentList.add(new Student("Student " + i, "androidstudent" + i + "@gmail.com")); 
//// 
////  } 
//  loadJsonData.execute(); 
// 
// 
// } 

    public static String convertInputStreamToString(InputStream inputStream) throws IOException { 
     BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); 
     String line = ""; 
     String result = ""; 
     while ((line = bufferedReader.readLine()) != null) { 
      result += line; 
     } 
     inputStream.close(); 
     return result; 
    } 

}

DataAdapter.javaある

import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.ProgressBar; 
import android.widget.TextView; 
import android.widget.Toast; 

import java.util.List; 

public class DataAdapter extends RecyclerView.Adapter { 
    private final int VIEW_ITEM = 1; 
    private final int VIEW_PROG = 0; 

    private List<Student> studentList; 


    // The minimum amount of items to have below your current scroll position 
    // before loading more. 
    private int visibleThreshold = 5; 
    private int lastVisibleItem, totalItemCount; 
    private boolean loading; 
    private OnLoadMoreListener onLoadMoreListener; 


    public DataAdapter(List<Student> students, RecyclerView recyclerView) { 
     studentList = students; 

     if (recyclerView.getLayoutManager() instanceof LinearLayoutManager) { 

      final LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView 
        .getLayoutManager(); 


      recyclerView 
        .addOnScrollListener(new RecyclerView.OnScrollListener() { 
         @Override 
         public void onScrolled(RecyclerView recyclerView, 
               int dx, int dy) { 
          super.onScrolled(recyclerView, dx, dy); 

          totalItemCount = linearLayoutManager.getItemCount(); 
          lastVisibleItem = linearLayoutManager 
            .findLastVisibleItemPosition(); 
          if (!loading 
            && totalItemCount <= (lastVisibleItem + visibleThreshold)) { 
           // End has been reached 
           // Do something 
           if (onLoadMoreListener != null) { 
            onLoadMoreListener.onLoadMore(); 
           } 
           loading = true; 
          } 
         } 
        }); 
     } 
    } 

    @Override 
    public int getItemViewType(int position) { 
     return studentList.get(position) != null ? VIEW_ITEM : VIEW_PROG; 
    } 

    @Override 
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, 
                 int viewType) { 
     RecyclerView.ViewHolder vh; 
     if (viewType == VIEW_ITEM) { 
      View v = LayoutInflater.from(parent.getContext()).inflate(
        R.layout.list_row, parent, false); 

      vh = new StudentViewHolder(v); 
     } else { 
      View v = LayoutInflater.from(parent.getContext()).inflate(
        R.layout.progress_item, parent, false); 

      vh = new ProgressViewHolder(v); 
     } 
     return vh; 
    } 

    @Override 
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { 
     if (holder instanceof StudentViewHolder) { 

      Student singleStudent = (Student) studentList.get(position); 

      ((StudentViewHolder) holder).name.setText(singleStudent.getName()); 
      ((StudentViewHolder) holder).type.setText(singleStudent.getType()); 
      ((StudentViewHolder) holder).profession.setText(singleStudent.getProfession()); 
      ((StudentViewHolder) holder).country.setText(singleStudent.getCountry()); 
      ((StudentViewHolder) holder).currency.setText(singleStudent.getCurrency()); 

     } else { 
      ((ProgressViewHolder) holder).progressBar.setIndeterminate(true); 
     } 
    } 

    public void setLoaded() { 
     loading = false; 
    } 

    @Override 
    public int getItemCount() { 
     return studentList.size(); 
    } 

    public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) { 
     this.onLoadMoreListener = onLoadMoreListener; 
    } 


    // 
    public static class StudentViewHolder extends RecyclerView.ViewHolder { 
     public TextView name; 
     public TextView type; 
     public TextView profession; 
     public TextView country; 
     public TextView currency; 

     public StudentViewHolder(View convertView) { 
      super(convertView); 
      name = (TextView) convertView.findViewById(R.id.name); 
      type = (TextView) convertView.findViewById(R.id.type); 
      profession = (TextView) convertView.findViewById(R.id.profession); 
      country = (TextView) convertView.findViewById(R.id.country); 
      currency = (TextView) convertView.findViewById(R.id.currecy); 
     } 
    } 

    public static class ProgressViewHolder extends RecyclerView.ViewHolder { 
     public ProgressBar progressBar; 

     public ProgressViewHolder(View v) { 
      super(v); 
      progressBar = (ProgressBar) v.findViewById(R.id.progressBar1); 
     } 
    } 
}

出典

2016-07-08 user3422948

答えて

0

こんにちは、あなたは、このコードを使用することができます：

完全なソースコード：github.com

public class RecyclerViewActivity extends AppCompatActivity implements Callback<String> { 

private int count=0; 
private SwipeRefreshLayout swipeContainer; 
@InjectView(R.id.recycler_view) 
RecyclerView recyclerView; 
private StaggeredGridLayoutManager mStaggeredLayoutManager; 
private final RecyclerBinderAdapter<TitleSection, CardViewType> adapter 
     = new RecyclerBinderAdapter<>(); 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_recycler_view); 
    ButterKnife.inject(this); 
    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(); 
     } 
    }); 


    // Lookup the swipe container view 
    swipeContainer = (SwipeRefreshLayout) findViewById(R.id.swipeContainer); 
    // Setup refresh listener which triggers new data loading 
    swipeContainer.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { 
     @Override 
     public void onRefresh() { 
      // Your code to refresh the list here. 
      // Make sure you call swipeContainer.setRefreshing(false) 
      // once the network request has completed successfully. 
      fetchTimelineAsync(count); 
      count++; 
     } 
    }); 

    mStaggeredLayoutManager = new StaggeredGridLayoutManager(1, StaggeredGridLayoutManager.VERTICAL); 
    recyclerView.setLayoutManager(mStaggeredLayoutManager); 
    recyclerView.setItemAnimator(new DefaultItemAnimator()); 
    recyclerView.setHasFixedSize(true); 
    recyclerView.setAdapter(adapter); 

    // Configure the refreshing colors 
    swipeContainer.setColorSchemeResources(android.R.color.holo_blue_bright, 
      android.R.color.holo_green_light, 
      android.R.color.holo_orange_light, 
      android.R.color.holo_red_light); 

    fetchTimelineAsync(0); 
    count++; 

    Retrofit retrofit = new Retrofit.Builder() 
      .baseUrl("http://xomorod.com") 
      .addConverterFactory(GsonConverterFactory.create()) 
      .build(); 

    SimpleService.StackOverflowAPI stackOverflowAPI = retrofit.create(SimpleService.StackOverflowAPI.class); 

    Call<String> call = stackOverflowAPI.loadQuestions("android"); 
    //asynchronous call 
    call.enqueue(this); 
} 


public void fetchTimelineAsync(int page) { 




} 

@Override 
public void onResponse(Response<String> response, Retrofit retrofit) { 
    setProgressBarIndeterminateVisibility(false); 


     CardPic cardPic=new CardPic(this,new PicData("Title" +response.body(),response.body(),"https://pixabay.com/static/uploads/photo/2015/04/10/00/41/yellow-715540_960_720.jpg")); 
     adapter.add(TitleSection.SECTION_3, cardPic); 


} 

@Override 
public void onFailure(Throwable t) { 
    String ss=t.getMessage(); 
    ss=ss+"sss"; 
}

出典

2016-07-08 09:42:24

+0

をあなたに返信ありがとう、私はtrあなたのソースコードをアンドロイドスタジオで移行することを拒否しましたが、それは機能しません。 – user3422948

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