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
android:id="@+id/widget38"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<LinearLayout
android:id="@+id/widget32"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_x="0px"
android:layout_y="0px"
>
</LinearLayout>
<ScrollView
android:id="@+id/sv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android"
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"
>
</TextView>
</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"
>
</Button>
</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();
}
}
