ListView 和 Adapter用法

<?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns:android="

http://schemas.android.com/apk/res/android" android:layout_width="fill_parent"  

android:layout_height="fill_parent" > <!-- 添加一个ListView控件 --> <ListView
android:id="@+id/lv" android:layout_width="fill_parent" android:layout_height="fill_parent" />  

</LinearLayout>

publicclass MyListView extends Activity {privatestaticfinal String[] strs = new String[] {
"first", "second", "third", "fourth", "fifth"
};//定义一个String数组用来显示ListView的内容 private ListView lv;/** Called when the activity is first created. */

@Override
publicvoid onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
setContentView(R.layout.main);lv = (ListView) findViewById(R.id.lv);//得到ListView对象的引用 /*为ListView设置Adapter来绑定数据*/ 

lv.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, strs)); }
}

lv.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_checked, strs));
lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

lv.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice, strs));
lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

lv.setAdapter(newArrayAdapter<String>(this,android.R.layout.simple_list_item_single_choice,strs));lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

lv.setOnItemClickListener(new OnItemClickListener() { @Override
publicvoid onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
//点击后在标题上显示点击了第几行 setTitle("你点击了第"+arg2+"行");
}
});

<?xmlversion="1.0"encoding="utf-8"?>

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android" 

android:layout_height="fill_parent" android:layout_width="fill_parent"> 

<ImageViewandroid:layout_alignParentRight="true" android:layout_width="wrap_content"

android:layout_height="wrap_content" android:id="@+id/ItemImage" /> 

<TextViewandroid:id="@+id/ItemTitle" android:layout_height="wrap_content" 

android:layout_width="fill_parent" android:textSize="20sp" />

<TextViewandroid:id="@+id/ItemText" android:layout_height="wrap_content" 

android:layout_width="fill_parent" android:layout_below="@+id/ItemTitle" /> </RelativeLayout>

publicclass MyListViewSimple extends Activity { private ListView lv;
/** Called when the activity is first created. */ @Override
publicvoid onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
setContentView(R.layout.main);lv = (ListView) findViewById(R.id.lv);/*定义一个动态数组*/  

ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>();/*在数组中存放数据*/

for(int i=0;i<10;i++)
{
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("ItemImage", R.drawable.icon);//加入图片 map.put("ItemTitle", "第"+i+"行");
map.put("ItemText", "这是第"+i+"行");
listItem.add(map);
} SimpleAdapter mSimpleAdapter = new SimpleAdapter(this,listItem,//需要绑定的数据  

R.layout.item,//每一行的布局//动态数组中的数据源的键对应到定义布局的View中 new String[] {"ItemImage"

,"ItemTitle", "ItemText"},
newint[] {R.id.ItemImage,R.id.ItemTitle,R.id.ItemText}
);lv.setAdapter(mSimpleAdapter);//为ListView绑定适配器 lv.setOnItemClickListener(new 

OnItemClickListener() { @Override
publicvoid onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
setTitle("你点击了第"+arg2+"行");//设置标题栏显示点击的行
}
});
}
}

publicclass MyListViewBase extends Activity { private ListView lv;
/*定义一个动态数组*/ ArrayList<HashMap<String, Object>>listItem;/** Called when the activity is first created. */ 

@Override
publicvoid onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
setContentView(R.layout.main);lv = (ListView) findViewById(R.id.lv);
MyAdapter mAdapter = new MyAdapter(this);//得到一个MyAdapter对象 lv.setAdapter(mAdapter);//为ListView绑定Adapter /*为ListView添加点击事件*/ 

lv.setOnItemClickListener(new OnItemClickListener() { @Override
publicvoid onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Log.v("MyListViewBase", "你点击了ListView条目" + arg2);//在LogCat中输出信息
}
}); }/*添加一个得到数据的方法，方便使用*/ private ArrayList<HashMap<String, Object>> getDate(){ ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>();
/*为动态数组添加数据*/ for(int i=0;i<30;i++)
{
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("ItemTitle", "第"+i+"行");
map.put("ItemText", "这是第"+i+"行");
listItem.add(map);
}
return listItem; }/* * 新建一个类继承BaseAdapter，实现视图与数据的绑定
*/ privateclass MyAdapter extends BaseAdapter {
private LayoutInflater mInflater;//得到一个LayoutInfalter对象用来导入布局 /*构造函数*/ 

public MyAdapter(Context context) {
this.mInflater = LayoutInflater.from(context);
} @Override
publicint getCount() { return getDate().size();//返回数组的长度 } @Override
public Object getItem(int position) {
returnnull;
} @Override
publiclong getItemId(int position) {
return 0;
}
/*书中详细解释该方法*/ @Override
public View getView(finalint position, View convertView, ViewGroup parent) {
ViewHolder holder;
//观察convertView随ListView滚动情况  

Log.v("MyListViewBase", "getView " + position + " " + convertView);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.item,
null);
holder = new ViewHolder();
/*得到各个控件的对象*/  

holder.title = (TextView) convertView.findViewById(R.id.ItemTitle);
holder.text = (TextView) convertView.findViewById(R.id.ItemText);
holder.bt = (Button) convertView.findViewById(R.id.ItemButton);
convertView.setTag(holder);//绑定ViewHolder对象 }
else{
holder = (ViewHolder)convertView.getTag();//取出ViewHolder对象 }
/*设置TextView显示的内容，即我们存放在动态数组中的数据*/  

holder.title.setText(getDate().get(position).get("ItemTitle").toString());
holder.text.setText(getDate().get(position).get("ItemText").toString()); /*为Button添加点击事件*/ holder.bt.setOnClickListener(new OnClickListener() { @Override
publicvoid onClick(View v) {
Log.v("MyListViewBase", "你点击了按钮" + position); //打印Button的点击信息
}
}); return convertView;
} }/*存放控件*/ publicfinalclass ViewHolder{
public TextView title;
public TextView text;
public Button bt;
}
}