android学习笔记——利用BaseAdapter生成40个列表项
时间:2014-05-26 17:04:30
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RT;
main.xml
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<?xml version= "1.0"
encoding= "utf-8" ?> <LinearLayout xmlns:android= "http://schemas.android.com/apk/res/android" android:orientation= "vertical" android:layout_width= "match_parent" android:layout_height= "match_parent" > <ListView android:id= "@+id/myList" android:layout_width= "match_parent" android:layout_height= "match_parent" /> </LinearLayout> |
MyActivity.java
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public class MyActivity extends
Activity { /** * Called when the activity is first created. */ ListView myList; public
void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.main); myList=(ListView)findViewById(R.id.myList); BaseAdapter adapter = new
BaseAdapter() { @Override public
int getCount() { //指定一共包含40个选项 return
40 ; } @Override public
Object getItem( int
i) { return
null ; //To change body of implemented methods use File | Settings | File Templates. } //重写该方法,该方法的返回值将作为列表项的ID @Override public
long getItemId( int
i) { return
i; //To change body of implemented methods use File | Settings | File Templates. } @Override public
View getView( int
i, View view, ViewGroup viewGroup) { //创建一个LinerarLayout,并向其中添加两个组件 LinearLayout line= new
LinearLayout(MyActivity. this ); line.setOrientation( 0 ); ImageView image= new
ImageView(MyActivity. this ); image.setImageResource(R.drawable.ic_launcher); TextView text= new
TextView(MyActivity. this ); text.setText( "第" +(i+ 1 )+ "个列表项" ); text.setTextSize( 20 ); text.setTextColor(Color.RED); line.addView(image); line.addView(text); //返回LinearLayout实例 return
line; } }; myList.setAdapter(adapter); } } |
效果如图:
创建一个BadeAdapter对象,扩展该对象需要重写如下4个方法
* getCount():该方法的返回值控制该Adapter将会包含多少个列表项。
* getItem():该方法的返回值决定第postion处的列表项的内容。
* getItemId(int i):该方法的返回值决定第postion处的列表项的ID。
* getView(int i,View view,ViewGroup viewGroup): 该方法的返回值决定第i处的列表项组件
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