我在ListView中獲得重複的項目。往回滾動有時會改變項目順序。 我搜索了一下,發現很多線程都報告了這個錯誤,但是他們都沒有幫我解決我的問題。ListView中的重複條目
這裏是我的代碼:
活動:
package com.github.progval.SeenDroid;
import java.util.ArrayList;
import java.util.List;
import com.github.progval.SeenDroid.lib.Connection;
import com.github.progval.SeenDroid.lib.Message;
import com.github.progval.SeenDroid.lib.MessageFetcher;
import com.github.progval.SeenDroid.lib.Query.ParserException;
import android.app.Activity;
import android.app.ListActivity;
import android.content.SharedPreferences;
import android.os.Bundle;
public class ShowUserActivity extends ListActivity {
private Connection connection;
public ArrayList<Message> listMessages = new ArrayList<Message>();
public MessageAdapter adapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.profile);
this.connection = new Connection();
this.setTitle(R.string.homefeed_title);
this.listMessages = new MessageFetcher(this.connection).fetchUser();
this.bindUi();
}
private void bindUi() {
this.adapter = new MessageAdapter(this, this.listMessages);
this.setListAdapter(adapter);
// TODO Bind buttons
}
}
MessageAdapter:
package com.github.progval.SeenDroid;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.Inflater;
import com.github.progval.SeenDroid.lib.Message;
import android.content.Context;
import android.text.Layout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MessageAdapter extends BaseAdapter {
private Context context;
private List<Message> items = new ArrayList<Message>();
private int lastPosition = 0;
public MessageAdapter(Context context, List<Message> items) {
super();
this.context = context;
this.items = items;
}
public View getView(int position, View convertView, ViewGroup parent) {
if (null == convertView) {
LinearLayout view;
view = (LinearLayout) LinearLayout.inflate(this.context, R.layout.message, null);
Log.d("SeenDroid", String.format("Get view %d", position));
TextView title = new TextView(view.getContext());
title.setText(this.items.get(position).getTitle());
view.addView(title);
return view;
} else {
return convertView;
}
}
@Override
public int getCount() {
return this.items.size();
}
@Override
public Object getItem(int location) {
return this.items.get(location);
}
@Override
public long getItemId(int arg0) {
return arg0;
}
}
順便說一句,輸出爲:
D/SeenDroid(30939): Get view 0
D/SeenDroid(30939): Get view 1
D/SeenDroid(30939): Get view 2
D/SeenDroid(30939): Get view 3
D/SeenDroid(30939): Get view 4
D/SeenDroid(30939): Get view 5
D/SeenDroid(30939): Get view 6
D/SeenDroid(30939): Get view 7
D/SeenDroid(30939): Get view 8
D/SeenDroid(30939): Get view 0
D/SeenDroid(30939): Get view 16
問候, ProgVal
好吧,我知道了。我認爲這只是重複使用對象的同一項目,而不是其他人。 但是,當我滾動時,滾動條現在變得越來越小,這取決於當前顯示的項目的高度。 –
@Arhimed你能否詳細解釋一下「解釋」部分。我很長時間以來一直困擾着這個問題。 – AbhishekB
@abhishekb:請查看詳情 - http://lucasr.org/2012/04/05/performance-tips-for-androids-listview/ –