Android ScrollView用法

Android ScrollView用法
今天试着使用了一下Android的滚轮，以下是一个小小的测试，读取测试文件，主要是使用scrollTo函数和getScrollY()，程序点击BUTTON按钮，则向下滚到2222处并显示。 

package zy.Scroller;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.apache.http.util.EncodingUtils;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
 
public class main extends Activity {
    /** Called when the activity is first created. */
    final public String DEV_FILE = "/data/data/zy.Scroller/aaa.txt";// 测试文件
    final String TEXT_ENCODING = "UTF-8";
    ScrollView sv;
    TextView tv;
    public Button test;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        sv = (ScrollView) findViewById(R.id.sv);
        tv = (TextView) findViewById(R.id.txtView);
        String str;
        str = getinfo(DEV_FILE);
        String[] x;
        x = str.split("/r");
        tv.setText(x[0]);
        int i;
        for (i = 1; i <= x.length - 1; i++) {
            tv.append(x[i]);
        }
 
        test = (Button) findViewById(R.id.test);
        test.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                sv.scrollTo(0, 2222);
                DisplayToast(sv.getScrollY() + "");
 
            }
 
        });
 
    }
 
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        DisplayToast("123");
    }
 
    public String getinfo(String path) {
        File file;
        String str = "";
        FileInputStream in;
        try {
            // 打开文件file的InputStream
            file = new File(path);
            in = new FileInputStream(file);
            // 将文件内容全部读入到byte数组
            int length = (int) file.length();
            byte[] temp = new byte[length];
            in.read(temp, 0, length);
            // 将byte数组用UTF-8编码并存入display字符串中
            str = EncodingUtils.getString(temp, TEXT_ENCODING);
            // 关闭文件file的InputStream
 
            in.close();
        } catch (IOException e) {
 
            DisplayToast(e.toString());
 
        }
        return str;
    }
 
    public void DisplayToast(String str) {
        Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
    }
}

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