Android中的根本控件（8）

• 安卓中的基本控件：滚动视图ScrollView，
  
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???????????首先我们了解一下什么是滚动视图

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?右边的滚动条就是利用这个原理做的，接下来我们自己来做一个简单的视图，首先定义xml文件

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/ScrollView1"    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" >    <LinearLayout        android:id="@+id/mylinear"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:orientation="vertical" >    </LinearLayout></ScrollView>

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.java文件定义：

public class MainActivity extends Activity {	private String  data[]={"湖南大学","张穗穗","岳麓山下","爱晚亭","自卑亭的小卖部","www.ee.com","咨询邮箱","综合楼","中南大学","小TJ","天马公寓"};	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		LinearLayout layout=(LinearLayout)super.findViewById(R.id.mylinear);		LinearLayout.LayoutParams param=new LinearLayout.LayoutParams(				ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);//定义布局参数		for(int i=0;i<this.data.length;i++){			Button bt=new Button(this);			bt.setText(this.data[i]);			layout.addView(bt,param);					}					}	@Override	public boolean onCreateOptionsMenu(Menu menu) {		// Inflate the menu; this adds items to the action bar if it is present.		getMenuInflater().inflate(R.menu.main, menu);		return true;	}}

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• 另一种? ListView

这回我们全部用代码布局，也就是说xml里不动手脚，这里要用到this.listview.setAdapter神秘适配器。源代码是：

public class MainActivity extends Activity {	private String  data[]={"湖南大学","张穗穗","岳麓山下","爱晚亭","自卑亭的小卖部","www.ee.com","咨询邮箱","综合楼","中南大学","小TJ","天马公寓"};    private ListView listview;	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		this.listview=new ListView(this);		this.listview.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1,this.data));		//定义适配器，每行显示一条数据，并设置组件内容		super.setContentView(listview);			}	@Override	public boolean onCreateOptionsMenu(Menu menu) {		// Inflate the menu; this adds items to the action bar if it is present.		getMenuInflater().inflate(R.menu.main, menu);		return true;	}}

?显示效果非常好，以前我们定义分割线要自己定义view，而这个主动定义了分割线。

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