Android ListView的使用

简介:

 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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