每天进步一点点

<ScrollView 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">
    
    <LinearLayout 
    	android:id="@+id/ll"
    	android:orientation="vertical"
    	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>
    
</ScrollView>

package com.example.mylistview;

import java.util.Random;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {
	private LinearLayout ll;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		ll = (LinearLayout)this.findViewById(R.id.ll);
		
		Random rd = new Random();
		for ( int i = 0 ; i < 70 ; i ++ )
		{
			TextView tv = new TextView(this);
			tv.setText(String.valueOf(rd.nextInt(500)));
			ll.addView(tv);

		}
		
	}

}