android 通过滚动条改变图片显示

 

在main.xml中

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

 

    <ImageView

        android:id="@+id/pic"

        android:src="@drawable/pic_0"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"/>

   

   <SeekBar

       android:id="@+id/seekbar"

       android:layout_width="fill_parent"

       android:layout_height="wrap_content"/>

 </LinearLayout>

 

 

 

在MySeekBarDemo.java程序中

package com.tarena.seekbar;

 

import android.app.Activity;

import android.os.Bundle;

import android.text.method.ScrollingMovementMethod;

import android.widget.ImageView;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;

import android.widget.TextView;

 

public class MySeekBarDemo extends Activity {

  private SeekBar seekbar = null;

  private ImageView pic = null;

  private int picData[] = new int[] {R.drawable.pic_0,R.drawable.pic_1,R.drawable.pic_2,

       R.drawable.pic_3,R.drawable.pic_4,R.drawable.pic_5,

       R.drawable.pic_6,R.drawable.pic_7,R.drawable.pic_8,R.drawable.pic_9};

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        super.setContentView(R.layout.main);

        this.seekbar = (SeekBar) super.findViewById(R.id.seekbar);  //取得组件

        this.pic = (ImageView) super.findViewById(R.id.pic);  //取得组件

        this.seekbar.setMax(9); //拖动条为0~9的范围

        this.seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListenerImpl());

    }

    private class OnSeekBarChangeListenerImpl implements OnSeekBarChangeListener{

 

     public void onProgressChanged(SeekBar seekBar, int progress,

         boolean fromUser) {

     }

 

     public void onStartTrackingTouch(SeekBar seekBar) {

       MySeekBarDemo.this.pic

         .setImageResource(MySeekBarDemo.this.picData[seekBar

              .getProgress()]);  //设置显示图片

     }

 

     public void onStopTrackingTouch(SeekBar seekBar) {

     }

   

    }

   

}