java - CWAC - 带有 ArrayAdapter 的 EndlessAdapter

Question

大家过得怎么样，在过去的一周里，我一直在努力弄清楚用 endlessadapter 包裹我的适配器到底意味着什么，但没有成功。我已经尝试了我有限的知识所允许的一切，到目前为止我正在输掉这场战斗。我已经在网上阅读了几个示例并阅读了无尽的适配器说明，但它并没有真正帮助。有人可以阐明包装我的适配器的含义吗。

我的 ListView 如下:

package com.bopbi.ui;

import java.sql.Date;
import java.text.SimpleDateFormat;
import java.util.ArrayList;

import com.bopbi.R;
import com.bopbi.model.LocationAdapter;
import com.bopbi.model.LocationList;
import com.bopbi.model.LocationModel;
import com.bopbi.model.PullToRefreshListView.OnRefreshListener;
import com.bopbi.util.RestClient;
import com.bopbi.model.PullToRefreshListView;
import com.bopbi.util.RestClient.RequestMethod;
import com.google.android.maps.GeoPoint;
import com.google.gson.Gson;

import android.app.ActionBar;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ListRest extends ListActivity {


LocationManager lm;
GeoPoint userLocation;

//static String[] TITLE;
//static String[] DESCRIPTION;

ArrayList<LocationModel> locationArray = null;
LocationAdapter locationAdapter;
LocationList list;

//PullToRefreshListView lv;
TextView loadingText;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ActionBar actionBar = getActionBar();
    actionBar.setDisplayShowTitleEnabled(false);
  //  actionBar.show();
  //  actionBar.setDisplayShowHomeEnabled(true);

    setContentView(R.layout.activity_home);

   // lv = (PullToRefreshListView) findViewById(R.id.list);

    locationArray = new ArrayList<LocationModel>();
    locationAdapter = new LocationAdapter(ListRest.this, R.layout.dublet, locationArray);
    ((PullToRefreshListView) getListView()).onRefresh();

 //   lv.setTextFilterEnabled(true);
    setListAdapter(locationAdapter);
    //this.getListView().scrollTo(0,160);
    //this.getListView().scrollTo(0,0);
    // Set a listener to be invoked when the list should be refreshed.
    ((PullToRefreshListView) getListView()).setOnRefreshListener(new OnRefreshListener() {
        @Override
        public void onRefresh() {
            // Do work to refresh the list here.
            try {
                new LocationSync().execute("http://exposezvous.com/list.php");
            } catch(Exception e) {} 
        }
    });



        try {
            new LocationSync().execute("http://exposezvous.com/list.php");
        } catch(Exception e) {} 



}





private class LocationSync extends AsyncTask<String, Integer, LocationList> {

    @Override
    protected void onPreExecute() {

}   

    protected LocationList doInBackground(String... urls) {
        LocationList list = null;
        int count = urls.length;

        for (int i = 0; i < count; i++) {
            try {           
                // ntar diganti service
                RestClient client = new RestClient(urls[i]);

                try {
                    client.Execute(RequestMethod.GET);
                } catch (Exception e) {
                    e.printStackTrace();
                }

                String json = client.getResponse();

                list = new Gson().fromJson(json, LocationList.class);

                //
            } catch(Exception e) {}
        }
        return list;
    }

    protected void onProgressUpdate(Integer... progress) {

    }

    protected void onPostExecute(LocationList loclist) {

        // Obtain MotionEvent object
        long downTime = SystemClock.uptimeMillis();
        long eventTime = SystemClock.uptimeMillis() + 100;
        float x = 1.0f;
        float y = 10.0f;
        // List of meta states found here: developer.android.com/reference/android/view/KeyEvent.html#getMetaState()
        int metaState = 0;
        MotionEvent motionEvent = MotionEvent.obtain(
            downTime, 
            eventTime, 
            MotionEvent.ACTION_MOVE, 
            x, 
            y, 
            metaState
        );  

        for(LocationModel lm : loclist.getLocations())
       {
     locationArray.add(lm);
        }
        locationAdapter.notifyDataSetChanged();
     // Call onRefreshComplete when the list has been refreshed.

   ((PullToRefreshListView) getListView()).onRefreshComplete();
    ((PullToRefreshListView) getListView()).onTouchEvent(motionEvent);

    ((PullToRefreshListView) getListView()).setLastUpdated("Last Updated on Jan 24, 2013 8:27 PM");
    }

}
}

我自定义的Adapter如下:

package com.bopbi.model;


import java.util.List;

import android.content.Context;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.bopbi.R;


public class LocationAdapter extends  ArrayAdapter<LocationModel> {

int resource;
String response;
Context context;
private LayoutInflater mInflater;
private final ImageDownloader imageDownloader = new ImageDownloader();
public int count;

public LocationAdapter(Context context, int resource,
        List<LocationModel> objects) {
    super(context, resource, objects);
    this.resource = resource;
    mInflater = LayoutInflater.from(context);
}

static class ViewHolder {
    TextView username;
    ImageView image;
}

public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    // Get the current location object
    LocationModel lm = (LocationModel) getItem(position);

    // Inflate the view
    if (convertView == null) {

        convertView = mInflater.inflate(R.layout.dublet, null);
        holder = new ViewHolder();



        holder.username = (TextView) convertView
                .findViewById(R.id.username);
        holder.image = (ImageView) convertView
                .findViewById(R.id.profilePic);

        // .findViewById(R.id.it_location_description);

        convertView.setTag(holder);

    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.username.setText(lm.getName());
    //String url = "http://***********/small_profile_pic_white_bigger.jpg";


    ImageDownloader.Mode mode = ImageDownloader.Mode.CORRECT;
    imageDownloader.setMode(mode);
    imageDownloader.download(lm.getImage(), holder.image);
    return convertView;
}




}

Answer 1

如果我没理解错的话，您是在尝试将 EndlessAdapter 与 LocationAdapter 一起使用。

documentation对于 Commonsware 的 EndlessAdapter 提到 EndlessAdapter 提供的构造函数之一将现有的 ListAdapter 作为其参数。包装您的适配器涉及将您的 LocationAdapter 作为参数传递给 EndlessAdapter 的子类。

private class EndlessLocationAdapter extends EndlessAdapter
{
  public EndlessLocationAdapter(LocationAdapter adapter)
    {
    super(adapter);
    }

  @Override
  protected boolean cacheInBackground() throws Exception
    {
    //Fetch more data
    }
//Other methods such as getPendingView(), appendCachedData()
}

在你的 Activity 中

locationArray = new ArrayList<LocationModel>();
LocationAdapter locationAdapter = new LocationAdapter(ListRest.this, R.layout.dublet, locationArray);
EndlessLocationAdapter endlessLocAdapter = new EndlessLocationAdapter(locationAdapter);
setListAdapter(endlessLocAdapter);