android viewpager 图片翻页例子

使用ViewPager这个类可以轻松实现多个页面的滑动功能

viewpager默认在工具界面上是找不到的，需求添加android-support-v4.jar包；

如果没有找到，需要打开Android SDK Manager在Extras中进行下载，最后记得引入工程中并build path。

（不过，我把代码直接COPY到.XML好像就会自动添加了）

 

例子说明：item01..item08是要翻页的图片，page_indicator_focused，page_indicator_unfocused是显示在底部的点点图片，要自己添加到res\drawable-hdpi\中；

.XML

代码下载：http://pan.baidu.com/s/1mgA7MBY

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <LinearLayout
            android:id="@+id/viewGroup"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="30dp"
            android:gravity="center_horizontal"
            android:orientation="horizontal" >
        </LinearLayout>
    </RelativeLayout>

</FrameLayout>

.JAVA

package com.example.testa;

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends Activity implements OnPageChangeListener {

    /**
     * ViewPager
     */
    private ViewPager viewPager;

    /**
     * 装点点的ImageView数组
     */
    private ImageView[] tips;

    /**
     * 装ImageView数组
     */
    private ImageView[] mImageViews;

    /**
     * 图片资源id
     */
    private int[] imgIdArray;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ViewGroup group = (ViewGroup) findViewById(R.id.viewGroup);
        viewPager = (ViewPager) findViewById(R.id.viewPager);

        // 载入图片资源ID
        imgIdArray = new int[] { R.drawable.item01, R.drawable.item02,
                R.drawable.item03, R.drawable.item04, R.drawable.item05,
                R.drawable.item06, R.drawable.item07, R.drawable.item08 };

        // 将点点加入到ViewGroup中
        tips = new ImageView[imgIdArray.length];
        for (int i = 0; i < tips.length; i++) {
            ImageView imageView = new ImageView(this);
            imageView.setLayoutParams(new LayoutParams(10, 10));
            tips[i] = imageView;
            if (i == 0) {
                tips[i].setBackgroundResource(R.drawable.page_indicator_focused);
            } else {
                tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused);
            }

            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                    new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
                            LayoutParams.WRAP_CONTENT));
            layoutParams.leftMargin = 5;
            layoutParams.rightMargin = 5;
            group.addView(imageView, layoutParams);
        }

        // 将图片装载到数组中
        mImageViews = new ImageView[imgIdArray.length];
        for (int i = 0; i < mImageViews.length; i++) {
            ImageView imageView = new ImageView(this);
            mImageViews[i] = imageView;
            imageView.setBackgroundResource(imgIdArray[i]);
        }

        // 设置Adapter
        viewPager.setAdapter(new MyAdapter());
        // 设置监听，主要是设置点点的背景
        viewPager.setOnPageChangeListener(this);
        // 设置ViewPager的默认项, 设置为长度的100倍，这样子开始就能往左滑动
        viewPager.setCurrentItem((mImageViews.length) * 100);

    }

    /**
     * 
     * @author xiaanming
     * 
     */
    public class MyAdapter extends PagerAdapter {

        @Override
        public int getCount() {
            return Integer.MAX_VALUE;
        }

        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            return arg0 == arg1;
        }

        @Override
        public void destroyItem(View container, int position, Object object) {
        }

        /**
         * 载入图片进去，用当前的position 除以 图片数组长度取余数是关键
         */
        @Override
        public Object instantiateItem(View container, int position) {
             try {    
                    ((ViewPager)container).addView(mImageViews[position % mImageViews.length], 0);  
                }catch(Exception e){  
                    //handler something  
                }  
                return mImageViews[position % mImageViews.length];            
    
        }

    }

    @Override
    public void onPageScrollStateChanged(int arg0) {

    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {

    }

    @Override
    public void onPageSelected(int arg0) {
        setImageBackground(arg0 % mImageViews.length);
    }

    /**
     * 设置选中的tip的背景
     * 
     * @param selectItems
     */
    private void setImageBackground(int selectItems) {
        for (int i = 0; i < tips.length; i++) {
            if (i == selectItems) {
                tips[i].setBackgroundResource(R.drawable.page_indicator_focused);
            } else {
                tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused);
            }
        }
    }

}

转自：http://blog.csdn.net/xiaanming/article/details/8966621

打开链接可查看效果图