为什么自定义列表视图改变位置？

我创建了自定义ListView。它有从0到10的11个项目。列表视图仅显示从0到8，然后再从0开始。请帮忙吗？这是代码：为什么自定义列表视图改变位置？

主要活动XML

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
tools:context="com.example.tefa.mycustomlist.MainActivity"> 

<ListView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/list" 
    android:divider="#223344" 
    android:dividerHeight="1dp" 
    android:listSelector="@drawable/list_selector" 
    />

行项目XML

<LinearLayout 
    android:id="@+id/thumbnail" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_marginRight="5dp" 
    android:background="#ffeeee" 


    android:padding="3dp"> 

    <ImageView 
     android:layout_width="50dp" 
     android:layout_height="50dp" 
     android:id="@+id/listImage" 
     android:background="@drawable/ic_launcher" /> 
</LinearLayout> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="The Alchemist" 
    android:layout_alignTop="@+id/thumbnail" 
    android:layout_toRightOf="@+id/thumbnail" 
    android:textSize="14dp" 
    android:textStyle="bold" 
    android:textColor="#040404" 
    android:id="@+id/title" 
    /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Paulo Coelho" 
    android:textColor="#ffde3a3d" 
    android:layout_toRightOf="@+id/thumbnail" 
    android:layout_below="@+id/title" 
    android:layout_marginTop="2dp" 
    android:id="@+id/author"/> 


<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="201 pages" 
    android:layout_alignParentRight="true" 
    android:layout_alignTop="@+id/thumbnail" 
    android:id="@+id/pages" 
    android:textStyle="bold" 

    /> 

<ImageView 
    android:layout_width="25dp" 
    android:layout_height="25dp" 
    android:layout_alignParentRight="true" 
    android:layout_below="@+id/pages" 
    android:layout_marginTop="2dp" 
    android:background="@drawable/ic_launcher"/>

主要活动

package com.example.tefa.mycustomlist; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ListView; 
import android.widget.Toast; 
import java.util.ArrayList; 
import java.util.HashMap; 
public class MainActivity extends Activity { 
ListView myList; 
CustomListViewAdapter myAdapter; 
ArrayList<HashMap<String, String>> authorList; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 


    final String[] bookTitles = new String[]{ 
      "0", 
      "1", 
      "2", 
      "3", 
      "4", 
      "5", 
      "6", 
      "7", 
      "8", 
      "9", 
      "10" 


    }; 

    final String[] bookPages = new String[]{ 
      "0", 
      "1", 
      "2", 
      "3", 
      "4", 
      "5", 
      "6", 
      "7", 
      "8", 
      "9", 
      "10" 
    }; 

    final String[] authors = new String[]{ 

      "0", 
      "1", 
      "2", 
      "3", 
      "4", 
      "5", 
      "6", 
      "7", 
      "8", 
      "9", 
      "10" 

    }; 

    authorList = new ArrayList<>(); 

    for (int i = 0; i < authors.length; i++) { 
     HashMap<String, String> data = new HashMap<>(); 
     data.put("title", bookTitles[i]); 
     data.put("pages", bookPages[i]); 
     data.put("author", authors[i]); 
     authorList.add(data); 
    } 

    myList = (ListView) findViewById(R.id.list); 

    myAdapter = new CustomListViewAdapter(getApplicationContext(), authorList); 
    myList.setAdapter(myAdapter); 



    } 

    }

CustomListViewAdapter

package com.example.tefa.mycustomlist; 
import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 

import java.util.ArrayList; 
import java.util.HashMap; 

public class CustomListViewAdapter extends BaseAdapter implements ListAdapter { 


private Context mContext; 
private ArrayList<HashMap<String, String>> books; 
private static LayoutInflater inflater; 

public CustomListViewAdapter(Context context, ArrayList<HashMap<String, String>> data) { 
    books = data; 
    mContext = context; 
    inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE); 
} 

@Override 
public int getCount() { 
    return books.size(); 
} 

@Override 
public Object getItem(int position) { 
    return position; 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 

    View view = convertView; 
    if (convertView == null) { 
     view = inflater.inflate(R.layout.list_row, null); 
     TextView title = (TextView) view.findViewById(R.id.title); 
     TextView author = (TextView) view.findViewById(R.id.author); 
     TextView pages = (TextView) view.findViewById(R.id.pages); 
     ImageView image = (ImageView) view.findViewById(R.id.listImage); 

     HashMap<String, String> mBook = books.get(position); 

     title.setText(mBook.get("title")); 
     author.setText(mBook.get("author")); 
     pages.setText(mBook.get("pages")); 
     image.setImageDrawable(mContext.getResources().getDrawable(R.drawable.ic_launcher)); 


    } 

    return view; 
    } 
}

来源

2016-03-07 Tefa

使用视图持有人在实施的ListView – Jas

@Jas你能告诉我怎么样吗？ – Tefa

@Selvin我之前试过搜索过，但我的英文没有帮我，谢谢你的回复 – Tefa

只需更换适配器

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.ListAdapter; 
import android.widget.TextView; 

import java.util.ArrayList; 
import java.util.HashMap; 

/** 
* Created by damodhar.meshram on 3/7/2016. 
*/ 
public class CustomListViewAdapter extends BaseAdapter implements ListAdapter { 


    private Context mContext; 
    private ArrayList<HashMap<String, String>> books; 
    private static LayoutInflater inflater; 

    public CustomListViewAdapter(Context context, ArrayList<HashMap<String, String>> data) { 
     books = data; 
     mContext = context; 
     inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE); 
    } 

    @Override 
    public int getCount() { 
     return books.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return position; 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 

     ViewHolder holder ; 
     if (convertView == null) { 
      holder = new ViewHolder(); 
      convertView = inflater.inflate(R.layout.list_row, null); 
      holder.title = (TextView) convertView.findViewById(R.id.title); 
      holder.author = (TextView) convertView.findViewById(R.id.author); 
      holder.pages = (TextView) convertView.findViewById(R.id.pages); 
      holder.image = (ImageView) convertView.findViewById(R.id.listImage); 


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



     HashMap<String, String> mBook = books.get(position); 

     holder.title.setText(mBook.get("title")); 
     holder.author.setText(mBook.get("author")); 
     holder.pages.setText(mBook.get("pages")); 
     holder.image.setImageDrawable(mContext.getResources().getDrawable(R.drawable.ic_launcher)); 

     return convertView; 
    } 

    static class ViewHolder { 
     private TextView title; 
     private TextView pages; 
     private TextView author; 
     private ImageView image; 
    } 

}

来源

2016-03-07 12:10:53

为什么自定义列表视图改变位置？

回答

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