android scrollview 简单的使用

首先是JAVA主代码:

package com.dudu.djy;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;

          /***
     * scrollview
     * @author dujinyang
   *
   */
public class ScrollViewTests extends Activity {
   /** Called when the activity is first created. */
   private LinearLayout mLayout;
   private ScrollView scView;
   private final Handler mHandler = new Handler();

   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
        //初始化操作
       mLayout = (LinearLayout) this.findViewById(R.id.LinearLayout);
       scView= (ScrollView) this.findViewById(R.id.ScrollView);

       Button mBtn = (Button) this.findViewById(R.id.Button);
       mBtn.setOnClickListener(mClickListener);// 添加点击事件监听
   }

//监听返回事件可以不要
   public boolean onKeyDown(int keyCode, KeyEvent event){
       Button bt = (Button) this.getCurrentFocus();
       int count = mLayout.getChildCount();
       Button bm = (Button) mLayout.getChildAt(count-1);

       if(keyCode==KeyEvent.KEYCODE_DPAD_UP && bt .getId()==R.id.Button){
           bm.requestFocus();
           return true;
       }else if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN && bt .getId()==bm.getId()){
           this.findViewById(R.id.Button).requestFocus();   //取消焦点
           return true;
       }
       return false;
   }

// Button事件监听,当点击第一个按钮时增加一个button和一个textview

//这里只是做个增加按钮和数据的
   private Button.OnClickListener mClickListener = new Button.OnClickListener() {

       private int index = 1;

       @Override
       public void onClick(View v) {
           TextView tv= new TextView(ScrollViewTest.this);//定义一个TextView
           tView.setText("TextView" + index);//设置TextView的文本信息
           //设置线性布局的属性
           LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                   LinearLayout.LayoutParams.FILL_PARENT,
                   LinearLayout.LayoutParams.WRAP_CONTENT);
           mLayout.addView(tv, params);//添加一个TextView控件
           Button button = new Button(ScrollViewTest.this);//定义一个Button
           button.setText("Button" + index);//设置Button的文本信息
           button.setId(index++);//id
           mLayout.addView(button, params);//添加一个Button控件
           mHandler.post(mScrollToButton);//传递一个消息进行滚动
       }

   };

//传递一个消息进行滚动
   private Runnable mScrollToButton = new Runnable() {

       @Override
       public void run() {
           int off = mLayout.getMeasuredHeight() - scView.getHeight();
           if (off > 0) {
               scView.scrollTo(0, off);//改变滚动条的位置
           }
       }
   };

}

然后是main.xml文件:

<?xml version="1.0" encoding="utf-8"?>

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ScrollView"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:scrollbars="vertical">

<LinearLayout android:id="@+id/LinearLayout"
          android:orientation="vertical" android:layout_width="fill_parent"
          android:layout_height="wrap_content">
       <TextView android:id="@+id/TestView" android:layout_width="fill_parent"
                  android:layout_height="wrap_content" android:text="TestView0" />
       <Button android:id="@+id/Button" android:text="Button0" android:layout_width="fill_parent"
               &

补充：移动开发 , Android ,