我正在使用ListFragments在android中实现一个项目。
我有一个问题,当列表足够小而不覆盖屏幕时(当有很多元素并且屏幕被覆盖时它不会出现)。问题是"幽灵"元素添加在列表的末尾。
例如,实施聊天,我可以看到2个与朋友聊天,第3个"幽灵"元素出现。
所以前两个元素没问题,但第三个元素不在我的数据库中。
这是我的XML代码:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@color/background_color_general"
android:onClick="insideChat"
tools:context="com.hissacclaim.pfc.pfchissacclaim.chat_messages_list">
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="@+id/NodeImage"
android:layout_width="60dp"
android:layout_height="60dp"
android:paddingTop="10dp"
android:background="@color/Black"
android:layout_marginLeft="10dp"
android:layout_marginBottom="5dp"
android:layout_marginTop="5dp" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginTop="4dp"
android:layout_marginRight="10dp"
android:layout_marginLeft="10dp"
android:orientation="vertical">
<TextView
android:id="@+id/NodeChat_id"
android:visibility="gone"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/NodeName"
android:textSize="16dp"
android:maxLines="1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/NodeLastMessage"
android:textSize="12dp"
android:layout_marginRight="10dp"
android:layout_marginTop="3dp"
android:maxLines="2"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<TextView
android:id="@+id/NodeHissDate"
android:textSize="10dp"
android:layout_marginTop="50dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
这是我的Java代码:
package com.hissacclaim.pfc.pfchissacclaim;
import android.app.Fragment;
import android.app.ListFragment;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
/**
* A simple {@link Fragment} subclass.
*/
public class chats extends ListFragment {
private MyAdapter mAdapter = null;
public class HissNode {
public String NodeChat_id;
public String NodeName;
public String NodeLastMessage;
public Integer NodeImg;
public String NodeMyDate;
}
private static ArrayList<HissNode> mArray = new ArrayList<HissNode>();
private void setData () throws JSONException {
JSONArray request = null;
try{
DownloadTask dlTask = new DownloadTask();
dlTask.getChats();
dlTask.execute();
request= dlTask.get();
}catch(Exception e){
Toast.makeText(getActivity().getApplicationContext(), "Error al recuperar BD data de los chats", Toast.LENGTH_LONG).show();
}
JSONObject json_data;
mArray.clear();
for(int i=0;i<request.length();i++) {
json_data = request.getJSONObject(i);
HissNode mynode = new HissNode();
mynode.NodeChat_id=json_data.getString("id");
mynode.NodeName = json_data.getString("first_name")+ " " +json_data.getString("last_name");
mynode.NodeLastMessage = json_data.getString("last_message");
mynode.NodeMyDate = json_data.getString("updated_at");
mynode.NodeImg = R.drawable.ic_launcher;
mArray.add(mynode);
}
/* HissNode mynode3 = new HissNode();
mynode3.Name="Third";
mynode3.Description="Tercer nodo muy grande a ver que tal sale esta jodida mierda sabes loco del culo";
mynode3.Img=R.drawable.ic_launcher;
mArray.add(mynode3);
*/
}
public static class MyAdapter extends BaseAdapter {
private Context myContext;
public MyAdapter(Context c) {
myContext=c;
}
public int getCount() {
return mArray.size();
}
public Object getItem(int position) {
return mArray.get(position);
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.chats_layout,null);
}
else {
view = convertView;
}
//ImageView img = (ImageView) view.findViewById(R.id.imageLanding);
//img.setImageDrawable(myContext.getResources().getDrawable(mArray.get(position).Img));
TextView chat_id = (TextView) view.findViewById(R.id.NodeChat_id);
chat_id.setText(mArray.get(position).NodeChat_id);
TextView name = (TextView) view.findViewById(R.id.NodeName);
name.setText(mArray.get(position).NodeName);
TextView description = (TextView) view.findViewById(R.id.NodeLastMessage);
description.setText(mArray.get(position).NodeLastMessage);
TextView mydate = (TextView) view.findViewById(R.id.NodeHissDate);
mydate.setText(mArray.get(position).NodeMyDate);
return view;
}
}
public chats() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
try {
setData();
} catch (JSONException e) {
e.printStackTrace();
}
mAdapter = new MyAdapter(this.getActivity());
setListAdapter(mAdapter);
return inflater.inflate(
R.layout.chats_layout, container, false);
}
}
任何帮助将不胜感激。感谢。
答案 0 :(得分:2)
我看到的第一件事是您为ListView
项目和片段使用相同的布局文件:
R.layout.chats_layout
。
绝对不应该这样。