ArrayList动态删除 自定义Adapter
上网收集了一些资料,都是从别人的代码中修改过来,一起分享。
1.先把所要的xml文件贴出来
a)listview.xml
b)base_adapter_item.xml
c)activity: DeleteListView.java
d)自定义适配器:ListAdapter.java
上网收集了一些资料,都是从别人的代码中修改过来,一起分享。
1.先把所要的xml文件贴出来
a)listview.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/listview_list"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
b)base_adapter_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<ImageView
android:id="@+id/base_item.image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="20dp"
/>
<TextView
android:id="@+id/base_item_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
c)activity: DeleteListView.java
package com.fx;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
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 android.widget.AdapterView.OnItemClickListener;
import com.fx.adapter.ListAdapter;
/**
* @author liucanwen
* @since 2012-08-10
* 联系qq 124597202
*/
public class DeleteListView extends Activity
{
private ArrayList<String> conList = new ArrayList<String>();
private ListView listView = null;
private List<Map<String, String>> list = new ArrayList<Map<String, String>>();
ListAdapter listAdapter;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.listview);
initsView();// 调用初始化方法
listView.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3)
{
Toast.makeText(DeleteListView.this, arg1.getId()+"", Toast.LENGTH_LONG)
.show();
listAdapter.removeItem(position);
}
});
}
// 初始化方法
public void initsView()
{
conList.add("图片1");
conList.add("图片2");
conList.add("图片3");
conList.add("图片4");
conList.add("图片5");
conList.add("图片6");
listView = (ListView) findViewById(R.id.listview_list);// 初始化ListView组件
// 通过BaseAdapter方法获取ListView组件内容
listAdapter = new ListAdapter(this,R.drawable.icon,conList);
listView.setAdapter(listAdapter);
}
}
d)自定义适配器:ListAdapter.java
package com.fx.adapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
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.TextView;
import com.fx.R;
/**
* 自定义适配器
* @author liucanwen
* @since 2012-08-10
* 联系qq 124597202
*/
public class ListAdapter extends BaseAdapter
{
private Context context;
int a;
ArrayList<String> list;
LayoutInflater lay;
private Map<Integer, View> map = new HashMap<Integer, View>();
public ListAdapter(Context context, int a, ArrayList<String> list)
{
this.context = context;
this.a = a;
this.list = list;
lay = LayoutInflater.from(this.context);
}
@Override
public int getCount()
{
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position)
{
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position)
{
// TODO Auto-generated method stub
return position;
}
//删除
public void removeItem(int id)
{
list.remove(id);
notifyDataSetInvalidated();
notifyDataSetChanged();
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
// TODO Auto-generated method stub
convertView = map.get(position);
ViewHolder viewHolder;
if (convertView == null)
{
convertView = lay.inflate(R.layout.base_adapter_item, null);
viewHolder = new ViewHolder();
viewHolder.textView = (TextView) convertView
.findViewById(R.id.base_item_text);
viewHolder.imageView = (ImageView) convertView
.findViewById(R.id.base_item_image);
map.put(position, convertView);
convertView.setTag(viewHolder);
convertView.setId(position + 21);
} else
{
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.imageView.setImageResource(a);
viewHolder.textView.setText(list.get(position));
return convertView;
}
public class ViewHolder
{
TextView textView;
ImageView imageView;
}
}