ListView的使用方法
public class BackgroundListActivity extends ListActivity {
/** The adapter. */
private EfficientAdapter adapter;
/** The context. */
private static Context context;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState)；
requestWindowFeature(Window.FEATURE_NO_TITLE);
context = this;
setContentView(R.layout.bglist_all);
setListAdapter(adapter = new EfficientAdapter(this));
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
...
}
/**
* The Class EfficientAdapter.
*/
private static class EfficientAdapter extends BaseAdapter {
/** The m inflater. */
private LayoutInflater mInflater;
/** The res. */
private int[] res = { R.drawable.bg_0, R.drawable.bg_1,
R.string.bg_select };
/**
* Instantiates a new efficient adapter.
*
* @param context
* the context
*/
public EfficientAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
/*
* (non-Javadoc)
*
* @see android.widget.Adapter#getCount()
*/
public int getCount() {
return res.length;
}
/*
* (non-Javadoc)
*
* @see android.widget.Adapter#getItem(int)
*/
public Integer getItem(int position) {
return res[position];
}
/*
* (non-Javadoc)
*
* @see android.widget.Adapter#getItemId(int)
*/
public long getItemId(int position) {
return position;
}
/*
* (non-Javadoc)
*
* @see android.widget.Adapter#getView(int, android.view.View,
* android.view.ViewGroup)
*/
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.bglist, null);
holder = new ViewHolder();
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
holder.desc = (TextView) convertView.findViewById(R.id.bgDesc);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// set the customized item
if (bgSelectId == getItem(position)) {
holder.desc.setText(getItem(position));
return convertView;
}
holder.desc.setText(context.getResources().getStringArray(
R.array.menu_background)[position]);
holder.icon.setImageResource(getItem(position));
holder.icon.setAdjustViewBounds(true);
return convertView;
}
/**
* The Class ViewHolder.
*/
static class ViewHolder {
/** The desc. */
TextView desc;
/** The icon. */
ImageView icon;
}
}
}
注意：
一.
在bglist_all.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" android:id="@+id/background_list_layout">
<ListView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@android:id/list">
</ListView>
</LinearLayout>
ListView的id必须命名为：@android:id/list 否则程式无法运行
二.
为ListView设置背景问题
在使用listView时，通过adapter加载每一个item时，即使不指定setContentView
只在adapter的getView中指定convertView=mInflater.inflate(R.layout.list, null);就可以运行。
不过如果想要在整个listView中设定background的话，则必须设定ContentView，然后在程式中的适当地方对其layout进行背景设定。
三.
另外还有设置背景后滑动listView时，背景出现黑屏现象
需要的时候再来找解决的方法。
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
其他用法相关网页：
参考网址 http://rayleung.iteye.com/blog/540423
首先在xml里面定义一个ListView
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<ListView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ListView01"
/>
</LinearLayout>
定义ListView每个条目的Layout，用RelativeLayout实现：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:id="@+id/RelativeLayout01"
android:layout_width="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:paddingBottom="4dip"
android:paddingLeft="12dip"
android:paddingRight="12dip">
<ImageView
android:paddingTop="12dip"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ItemImage"
/>
<TextView
android:text="TextView01"
android:layout_height="wrap_content"
android:textSize="20dip"
android:layout_width="fill_parent"
android:id="@+id/ItemTitle"
/>
<TextView
android:text="TextView02"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_below="@+id/ItemTitle"
android:id="@+id/ItemText"
/>
</RelativeLayout>
最后在Activity里面调用和加入Listener,具体见注释：
package com.ray.test;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnCreateContextMenuListener;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.AdapterView.OnItemClickListener;
public class TestListView extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//绑定Layout里面的ListView
ListView list = (ListView) findViewById(R.id.ListView01);
//生成动态数组，加入数据
ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>();
for(int i=0;i<10;i++)
{
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("ItemImage", R.drawable.checked);//图像资源的ID
map.put("ItemTitle", "Level "+i);
map.put("ItemText", "Finished in 1 Min 54 Secs, 70 Moves! ");
listItem.add(map);
}
//生成适配器的Item和动态数组对应的元素
SimpleAdapter listItemAdapter = new SimpleAdapter(this,listItem,//数据源
R.layout.list_items,//ListItem的XML实现
//动态数组与ImageItem对应的子项
new String[] {"ItemImage","ItemTitle", "ItemText"},
//ImageItem的XML文件里面的一个ImageView,两个TextView ID
new int[] {R.id.ItemImage,R.id.ItemTitle,R.id.ItemText}
);
//添加并且显示
list.setAdapter(listItemAdapter);
//添加点击
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
setTitle("点击第"+arg2+"个项目");
}
});
//添加长按点击
list.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {
menu.setHeaderTitle("长按菜单-ContextMenu");
menu.add(0, 0, 0, "弹出长按菜单0");
menu.add(0, 1, 0, "弹出长按菜单1");
}
});
}
//长按菜单响应函数
@Override
public boolean onContextItemSelected(MenuItem item) {
setTitle("点击了长按菜单里面的第"+item.getItemId()+"个项目");
return super.onContextItemSelected(item);
}
}
