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。

main.xml

<?xml version="1.0" encoding="utf-8"?> 
<AbsoluteLayout xmlns:android="​​http://schemas.android.com/apk/res/android​​"
    android:id="@+id/widget38" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"> 
    <LinearLayout xmlns:android="​​http://schemas.android.com/apk/res/android​​"
        android:id="@+id/widget32" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_x="0px"
        android:layout_y="0px"> 
    </LinearLayout> 
    <ScrollView xmlns:android="​​http://schemas.android.com/apk/res/android​​"
        android:id="@+id/sv" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_x="0px"
        android:layout_y="20px"> 
        <TextView 
            android:id="@+id/txtView" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" 
            android:text="hello,user!"
            android:textSize="20sp" /> 
    </ScrollView> 
    <Button 
        android:id="@+id/test" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:text="Button"
        android:layout_x="230px" 
        android:layout_y="2px" /> 
</AbsoluteLayout>

main.java

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(); 
    } 
}