Android开发拖动条实现照片的切换

.xml

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context=".MainActivity" >

    <ImageView 

        android:id="@+id/img"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/pic_0"/>

    

    <SeekBar 

        android:id="@+id/seekbar"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"/>

    

    <TextView 

        android:id="@+id/text"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"/>

</LinearLayout>

.java

package com.example.seekbardemo2;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.widget.ImageView;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;

import android.widget.TextView;

public class MainActivity extends Activity {

private ImageView img=null;

private SeekBar seekbar=null;

private TextView text=null;

private int data[]=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

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

this.img=(ImageView) super.findViewById(R.id.img);

this.seekbar=(SeekBar) super.findViewById(R.id.seekbar);

this.seekbar.setMax(9);

this.text=(TextView) super.findViewById(R.id.text);

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

}

public class OnSeekBarChangeListenerImp implements OnSeekBarChangeListener{

//拖动过程

public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) {

// TODO Auto-generated method stub

int cur=arg0.getProgress();

//设置显示的图片

MainActivity.this.img.setImageResource(MainActivity.this.data[cur]);

MainActivity.this.text.setText("当前第"+(cur+1)+"张"+" 还有"+(MainActivity.this.data.length-cur-1)+"张");

}

//刚开始拖动

public void onStartTrackingTouch(SeekBar arg0) {

// TODO Auto-generated method stub

}

public void onStopTrackingTouch(SeekBar arg0) {

// TODO Auto-generated method stub

}

}

}