通過使用EndlessAdapter不添加圖像的新列表

Question

我使用EndlessAdapter來顯示圖像列表，但在滾動後不添加新列表。

我的代碼是這樣的：

/*** 
    Copyright (c) 2008-2009 CommonsWare, LLC 

    Licensed under the Apache License, Version 2.0 (the "License"); you may 
    not use this file except in compliance with the License. You may obtain 
    a copy of the License at 
     http://www.apache.org/licenses/LICENSE-2.0 
    Unless required by applicable law or agreed to in writing, software 
    distributed under the License is distributed on an "AS IS" BASIS, 
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
    See the License for the specific language governing permissions and 
    limitations under the License. 
*/ 

package com.sample.endlessdemo; 

import java.io.BufferedInputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.net.URL; 
import java.net.URLConnection; 

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

import android.app.ListActivity; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.Bundle; 
import android.os.SystemClock; 
import android.util.Log; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.animation.Animation; 
import android.view.animation.RotateAnimation; 
import android.widget.ArrayAdapter; 
import android.widget.ImageView; 
import android.widget.ListView; 

public class EndlessAdapterDemo extends ListActivity { 
    String name[]; 
    String urls[]; 
    int j,limit; 
    //ListView listValues; 
    @Override 
    public void onCreate(Bundle icicle) { 
     super.onCreate(icicle); 
     setContentView(R.layout.main); 
     RestClient post=new RestClient("http://iconnect.myappdemo.com/listusers.php"); 
     try { 
      post.ExecutePost(); 
     } catch (Exception e2) { 
      // TODO Auto-generated catch block 
      e2.printStackTrace(); 
     } 
     String response=post.getResponse(); 
     Log.e("Respopnse :",response); 
     JSONArray json = null; 
     try { 
      json = new JSONArray(response); 
     } catch (JSONException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
     } 
     name=new String[json.length()]; 
     for(int i=0;i<json.length();i++) 
      try { 
       name[i]=json.getJSONObject(i).getString("picture").toString(); 
      } catch (JSONException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

     urls=new String[10]; 

     for (int i=0;i<10;i++) { urls[i]=name[i]; } 

     setListAdapter(new DemoAdapter(urls)); 
    } 

    class DemoAdapter extends EndlessAdapter { 
     private RotateAnimation rotate=null; 

     DemoAdapter(String list[]) { 
      super(new StartingView(EndlessAdapterDemo.this,R.layout.row,list)); 

      rotate=new RotateAnimation(0f,360f,Animation.RELATIVE_TO_SELF,0.5f, Animation.RELATIVE_TO_SELF,0.5f); 
      rotate.setDuration(1000); 
      rotate.setRepeatMode(Animation.RESTART); 
      rotate.setRepeatCount(Animation.INFINITE); 
     } 

     @Override 
     protected View getPendingView(ViewGroup parent) { 
      Log.e("Demo Adapter","getPendingView"); 
      View row=getLayoutInflater().inflate(R.layout.listrow,null); 
      View child=row.findViewById(android.R.id.list); 
      //View child=row.findViewById(R.id.image); 
      child.setVisibility(View.GONE); 

      child=row.findViewById(R.id.throbber); 
      child.setVisibility(View.VISIBLE); 
      child.startAnimation(rotate); 

      return(row); 

     } 

     @Override 
     protected boolean cacheInBackground() { 
      SystemClock.sleep(10000);    // pretend to do work 
      Log.e("Demo Adapter","In cacheInBackground"); 
      return(getWrappedAdapter().getCount()<20); 
     } 


     @Override 
     protected void appendCachedData() 
     { 
//   if (getWrappedAdapter().getCount()<75) { 
//    Log.e("Demo Adapter","In appendCachedData"); 
//    @SuppressWarnings("unchecked") 
//    ArrayAdapter<String> a=(ArrayAdapter<String>)getWrappedAdapter(); 
//    for (int i=0;i<5;i++) { a.add(name[a.getCount()]); } 
//   } 
      @SuppressWarnings("unchecked") 
      ArrayAdapter<String> a=(ArrayAdapter<String>)getWrappedAdapter(); 
      for(int i=0;i<5;i++){ 
      Log.e("a.getCount()+i value :",String.valueOf(a.getCount()+i)); 
      a.getView(a.getCount()+i,null,null); 
      } 
      } 
    } 
    class StartingView extends ArrayAdapter<String>{ 
     String startUrls[]; 
     public StartingView(Context context, int ResourceId,String[] objects) { 
      super(context, ResourceId, objects); 
      startUrls=new String[objects.length]; 
      startUrls=objects; 
      // TODO Auto-generated constructor stub 
     } 

     public View getView(int pos,View counterview,ViewGroup parent){ 
      View row=getLayoutInflater().inflate(R.layout.row,null); 
      ImageView image=(ImageView)row.findViewById(R.id.image); 
      Log.e("position :",String.valueOf(pos)); 
      image.setImageBitmap(convertImage(name[pos])); 
      return row; 
     } 
    } 

    public Bitmap convertImage(String imgstr){ 
     URL aURL = null; 
     try { 
      final String imageUrl =imgstr.replaceAll(" ","%20"); 
      Log.e("Image Url",imageUrl); 
      aURL = new URL(imageUrl); 
      URLConnection conn = aURL.openConnection(); 
      InputStream is = conn.getInputStream(); 
      BufferedInputStream bis = new BufferedInputStream(is); 
      Bitmap bm = BitmapFactory.decodeStream(bis); 
      is.close(); 
      return bm; 
     } 
     catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      return null; 
     } 
    } 
} 

Answer 1

我希望下面的代碼將幫助你。

PS：原始源代碼和問題可以發現here.

公共類測試延伸ListActivity 實現OnScrollListener {

Aleph0 adapter = new Aleph0(); 

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setListAdapter(adapter); 
    getListView().setOnScrollListener(this); 
} 

public void onScroll(AbsListView view, 
    int firstVisible, int visibleCount, int totalCount) { 

    boolean loadMore = /* maybe add a padding */ 
     firstVisible + visibleCount >= totalCount; 

    if(loadMore) { 
     adapter.count += visibleCount; // or any other amount 
     adapter.notifyDataSetChanged(); 
    } 
} 

public void onScrollStateChanged(AbsListView v, 

的int）{}

class Aleph0 extends BaseAdapter { 
    int count = 40; /* starting amount */ 

    public int getCount() { return count; } 
    public Object getItem(int pos) { return pos; } 
    public long getItemId(int pos) { return pos; } 

    public View getView(int pos, View v, ViewGroup p) { 
      TextView view = new TextView(Test.this); 
      view.setText("entry " + pos); 
      return view; 
    } 
} } 

Answer 2

添加此後退貨r完成加載：

StartingView.notifyDataSetChanged()