【移动应用开发技术】android studio   Listview简单实例

【移动应用开发技术】androidstudio

Listview简单实例

//layout布局<?xmlversion="1.0"encoding="utf-8"?><RelativeLayoutxmlns:android="/apk/res/android"

xmlns:tools="/tools"android:layout_width="match_parent"

android:layout_height="match_parent"android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

android:paddingBottom="@dimen/activity_vertical_margin"

><ListView

android:layout_width="match_parent"

android:layout_height="match_parent"

android:id="@android:id/list"

/></RelativeLayout>//代码packagecom.example.test.testlistview;importandroid.app.ListActivity;importandroid.os.Bundle;importandroid.view.View;importandroid.widget.ArrayAdapter;importandroid.widget.ListView;importandroid.widget.TextView;importandroid.widget.Toast;importjava.util.ArrayList;importjava.util.List;publicclassListViewArrayadapterextendsListActivity{

@Override

protectedvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_list_view_arrayadapter);

List<String>ls=newArrayList<String>();

ls.add("测试数据1");

ls.add("测试数据2");

ls.add("测试数据1");

ls.add("测试数据2");

ls.add("测试数据1");

ls.add("测试数据2");

ls.add("测试数据1");

ls.add("测试数据2");

ls.add("测试数据1");

ls.add("测试数据2");

ls.add("测试数据1");

ls.add("测试数据2");

ArrayAdapteradapter=newArrayAdapter(this,android.R.layout.simple_list_item_1,ls);

setListAdapter(adapter);

//继承ListActivity才有此函数

}

@Override

protectedvoidonListItemClick(ListViewl,Viewv,intposition,longid){

Strings=((TextView)v).getText().toString();

Toast.makeText(this,"提示"+position+s,Toast.LENGTH_LONG).show();

super.onListItemClick(l,v,position,id);

}}//效果图简单的listview，关键是ArrayAdapter中布局和数据的适配。android.R.layout.simple_list_item_1系统自带的样式，可以根据自己的要求更改布局样式。List<String>ls=newArrayList<String>()用于显示的数据。//SimpleAdapter适配Listview//layout<?xmlversion="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="/apk/res/android"

android:orientation="horizontal"android:layout_width="match_parent"

android:layout_height="match_parent"><ImageView

android:id="@+id/img2"

android:layout_height="wrap_content"

android:layout_width="wrap_content"

/>

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="vertical">

<TextView

android:id="@+id/title2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

<TextView

android:id="@+id/price"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

</LinearLayout></LinearLayout>//关键代码设置listview

SimpleAdapteradapter1=newSimpleAdapter(this,lm,R.layout.simple2,newString[]{"title","img","price"},newint[]{R.id.title2,R.id.img2,R.id.price});

setListAdapter(adapter1);//得到数据

publicList<Map<String,Object>>getData2()

{

Map<String,Object>value=newHashMap<String,Object>();

List<Map<String,Object>>lm=newArrayList<Map<String,Object>>();

value.put("title","苹果");

value.put("img",R.drawable.aphone);

value.put("price","价格：5800");

lm.add(value);

value=newHashMap<String,Object>();

value.put("title","三星");

value.put("img",R.drawable.sphone);

value.put("price","价格：4800");

lm.add(value);

value=newHashMap<String,Object>();

value.put("title","华为");

value.put("img",R.drawable.hphone);

value.put("price","价格：6000");

lm.add(value);

return

lm;

}//SimpleCursorAdapter适配Listview用于数据库数据的显示//关键代码

//获得一个指向系统通讯录数据库的Cursor对象获得数据来源

Cursorcursor=getContentResolver().query(Contacts.People.CONTENT_URI,null,null,null,null);

startManagingCursor(cursor);

//实例化列表适配器

ListAdapterla=newSimpleCursorAdapter(this,android.R.layout.simple_list_item_2,cursor,newString[]{Contacts.People.NAME,Contacts.P