Android ListView的使用
本文共 7336 字，大约阅读时间需要 24 分钟。
1、定义简单的适配器形式。
首先定义一个Layout为listviewitem.xml. 里面有三个TextView。分别代表学号，姓名，班级。
<?xml version= "1.0" encoding= "utf-8" ?> <LinearLayout xmlns:android= "http://schemas.android.com/apk/res/android" android:id= "@+id/cuslistViewItem" android:layout_width= "match_parent" android:layout_height= "match_parent" android:orientation= "horizontal" > <TextView android:id= "@+id/textView1" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "TextView" android:layout_marginLeft= "10dp" android:layout_marginBottom= "10dp" /> <TextView android:id= "@+id/textView3" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "TextView" android:layout_marginLeft= "10dp" android:layout_marginBottom= "10dp" /> <TextView android:id= "@+id/textView2" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "TextView" android:layout_marginLeft= "10dp" android:layout_marginBottom= "10dp" /> </LinearLayout> |
在activity_main.xml中放一个ListView控件，很简单，不解释。
<RelativeLayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http://schemas.android.com/tools" android:layout_width= "match_parent" android:layout_height= "match_parent" android:paddingBottom= "@dimen/activity_vertical_margin" android:paddingLeft= "@dimen/activity_horizontal_margin" android:paddingRight= "@dimen/activity_horizontal_margin" android:paddingTop= "@dimen/activity_vertical_margin" tools:context= ".MainActivity" > <TextView android:id= "@+id/textView1" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "@string/hello_world" /> <ListView android:id= "@+id/listView1" android:layout_width= "match_parent" android:layout_height= "wrap_content" android:layout_alignParentLeft= "true" android:layout_below= "@+id/textView1" android:layout_marginTop= "50dp" > </ListView> </RelativeLayout> |
然后建立数据源
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); ListView lv = (ListView) this .findViewById(R.id.listView1); ArrayList<HashMap<String,String>> listSource = new ArrayList<HashMap<String,String>>(); for ( int num= 1 ; num< 10 ; num++) { HashMap<String,String> map = new HashMap<String, String>(); map.put( "num" ,String.valueOf(num)); map.put( "name" , "stu" +num ); map.put( "className" , "software 2" ); listSource.add(map); } SimpleAdapter mStuInfo = new SimpleAdapter( this ,listSource,R.layout.listviewitem, new String[] { "num" , "name" , "className" }, new int []{R.id.textView1, R.id.textView2, R.id.textView3}); lv.setAdapter(mStuInfo); } } |
最后将listview绑定适配器的数据源。效果图如下图。
当然可以加入ItemClick事件。
lv.setOnItemClickListener( new ItemClickListener()); |
然后实现ItemClickListener。
class ItemClickListener implements OnItemClickListener { //arg2 is the position //arg3 is row number @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub HashMap<String, String> item=(HashMap<String, String>) arg0.getItemAtPosition(arg2); Toast.makeText(MainActivity. this , item.get( "name" ), Toast.LENGTH_LONG).show(); } } |
ListView和GridView在此用法是一样的。可以把ListView控件换成GridView控件。
二、下面采用新的适配器形式。将添加学生图片，并重新组织布局。效果如下图:
代码如下：
重新设计的listviewitem.xml.
<?xml version= "1.0" encoding= "utf-8" ?> <RelativeLayout xmlns:android= "http://schemas.android.com/apk/res/android" android:id= "@+id/cuslistViewItem" android:layout_width= "match_parent" android:layout_height= "match_parent" android:orientation= "horizontal" > <ImageView android:id= "@+id/imageView1" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:layout_marginLeft= "10dp" android:layout_marginBottom= "10dp" /> <TextView android:id= "@+id/textView1" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "TextView" android:layout_toRightOf= "@+id/imageView1" android:layout_marginLeft= "10dp" android:layout_marginBottom= "10dp" /> <TextView android:id= "@+id/textView2" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "TextView" android:layout_toRightOf= "@+id/textView1" android:layout_marginLeft= "10dp" android:layout_marginBottom= "10dp" /> <TextView android:id= "@+id/textView3" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "TextView" android:layout_toRightOf= "@+id/imageView1" android:layout_below= "@+id/textView1" android:layout_marginLeft= "10dp" android:layout_marginBottom= "30dp" /> </RelativeLayout> |
重新的数据源。建立了MyListViewAdapter类继承BaseAdapter。
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); ListView lv = (ListView) this .findViewById(R.id.listView1); ArrayList<HashMap<String,String>> listSource = new ArrayList<HashMap<String,String>>(); for ( int num= 1 ; num< 10 ; num++) { HashMap<String,String> map = new HashMap<String, String>(); map.put( "photo" , String.valueOf(R.drawable.ic_launcher)); map.put( "num" ,String.valueOf(num)); map.put( "name" , "stu" +num ); map.put( "className" , "software 2" ); listSource.add(map); } lv.setAdapter( new MyListViewAdapter(listSource)); } public class MyListViewAdapter extends BaseAdapter{ View[] itemViews; public MyListViewAdapter(ArrayList<HashMap<String,String>> listSource) { itemViews = new View[listSource.size()]; Iterator<HashMap<String, String>> it = listSource.iterator(); HashMap<String,String> hash; int i = 0 ; try { while (it.hasNext()) { hash = it.next(); itemViews[i] = makeItemView(hash); i++; } } catch (Exception e){ Log.e( "Error" , e.getMessage()); e.printStackTrace(); } } private View makeItemView(HashMap<String,String> map) { if (map == null || map.isEmpty()) return null ; LayoutInflater inflater = (LayoutInflater) MainActivity. this .getSystemService(Context.LAYOUT_INFLATER_SERVICE); // 使用View的对象itemView与R.layout.item关联 View itemView = inflater.inflate(R.layout.listviewitem, null ); TextView title = (TextView) itemView.findViewById(R.id.textView1); title.setText(map.get( "num" )); Log.e( "num" , map.get( "num" )); TextView text = (TextView) itemView.findViewById(R.id.textView2); text.setText(map.get( "name" )); Log.e( "name" , map.get( "name" )); TextView text2 = (TextView) itemView.findViewById(R.id.textView3); text2.setText(map.get( "className" )); Log.e( "className" , map.get( "className" )); ImageView image = (ImageView) itemView.findViewById(R.id.imageView1); image.setImageResource(Integer.parseInt(map.get( "photo" ))); Log.e( "photo" , map.get( "photo" )); return itemView; } @Override public int getCount() { // TODO Auto-generated method stub return itemViews.length; } @Override public Object getItem( int position) { // TODO Auto-generated method stub return itemViews[position]; } @Override public long getItemId( int position) { // TODO Auto-generated method stub return position; } @Override public View getView( int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub if (convertView == null ) return itemViews[position]; return convertView; }} } } |
本文转自Work Hard Work Smart博客园博客，原文链接：http://www.cnblogs.com/linlf03/archive/2013/03/14/2960192.html，如需转载请自行联系原作者
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