从零开始学android<ScrollView滚动视图.十八.>

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:id="@+id/mylayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >
    </LinearLayout>

</ScrollView>

package com.example.scrollview;

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;

public class MainActivity extends Activity {
	

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		 LinearLayout layout = new LinearLayout(this);//创建LinearLayout对象
		 layout = (LinearLayout)
		 this.findViewById(R.id.mylayout);//实例化LinearLayout对象
		 //设置Button组件的宽和高
		 LinearLayout.LayoutParams Params = new LinearLayout.LayoutParams(
		 ViewGroup.LayoutParams.MATCH_PARENT,
		 ViewGroup.LayoutParams.WRAP_CONTENT);
		 for (int i = 0; i < 20; i++) {//设置循环创建Button对系那个
		 Button button=new Button(this);
		 button.setText("button"+i);//设置标题
		 button.setGravity(Gravity.CENTER);//设置对齐方式
		 layout.addView(button,Params);//添加组件
		 }

		

	}

}