android viewpager 一页显示多个图片

package com.example.viewpagertext;

import android.app.Activity;

import android.os.Bundle;

import android.support.v4.view.PagerAdapter;

import android.support.v4.view.ViewPager;

import android.support.v4.view.ViewPager.OnPageChangeListener;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnTouchListener;

import android.view.ViewGroup;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.TextView;

/**

* ViewPager实现画廊效果

*

*/

public class MianActivity extends Activity

{

private static int TOTAL_COUNT = 3;

private LinearLayout viewPagerContainer;

private ViewPager viewPager;

private TextView tvTitle;

private int[] imageIDs;//原来图片

private int[] imageIDsFocused;//选中的中间放入图片的颜色

private ImageView[] mImageViews;

@Override

protected void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.item1);

tvTitle = (TextView) findViewById(R.id.title);

viewPager = (ViewPager) findViewById(R.id.view_pager);

viewPagerContainer = (LinearLayout) findViewById(R.id.pager_layout);

imageIDs = new int[] { R.drawable.sceneicon1, R.drawable.sceneicon2, R.drawable.sceneicon3, R.drawable.sceneicon4,

R.drawable.sceneicon5, R.drawable.sceneicon6, R.drawable.sceneicon7, R.drawable.sceneicon8, R.drawable.sceneicon9,

R.drawable.sceneicon10, R.drawable.sceneicon11, R.drawable.sceneicon12, R.drawable.sceneicon13, R.drawable.sceneicon14,

R.drawable.sceneicon15, R.drawable.sceneicon16, R.drawable.sceneicon17, R.drawable.sceneicon18

};

imageIDsFocused = new int[] { R.drawable.sceneiconsel1, R.drawable.sceneiconsel2, R.drawable.sceneiconsel3,

R.drawable.sceneiconsel4, R.drawable.sceneiconsel5, R.drawable.sceneiconsel6, R.drawable.sceneiconsel7,

R.drawable.sceneiconsel8, R.drawable.sceneiconsel9, R.drawable.sceneiconsel10, R.drawable.sceneiconsel11,

R.drawable.sceneiconsel12, R.drawable.sceneiconsel13, R.drawable.sceneiconsel14, R.drawable.sceneiconsel15,

R.drawable.sceneiconsel16, R.drawable.sceneiconsel17, R.drawable.sceneiconsel18

};

// 将图片装载到数组中

mImageViews = new ImageView[imageIDs.length];

for (int i = 0; i < mImageViews.length; i++)

{

ImageView imageView = new ImageView(this);

mImageViews[i] = imageView;

imageView.setBackgroundResource(imageIDs[i]);

}

int width = ScreenUtil.getScreenWidth(this);

int left = viewPagerContainer.getLeft();

viewPager.setPageMargin(20);

int pageWidth = (width - viewPager.getPageMargin() * 3 - left * 2) / 3;

LinearLayout.LayoutParams viewPagerPara = new LinearLayout.LayoutParams(pageWidth, pageWidth);

viewPager.setLayoutParams(viewPagerPara);

viewPager.setAdapter(new MyPagerAdapter());

viewPager.setOffscreenPageLimit(TOTAL_COUNT);

viewPager.setOnPageChangeListener(new MyOnPageChangeListener());

viewPagerContainer.setOnTouchListener(new OnTouchListener()

{

@Override

public boolean onTouch(View v, MotionEvent event)

{

return viewPager.dispatchTouchEvent(event);

}

});

}

class MyPagerAdapter extends PagerAdapter

{

@Override

public int getCount()

{

// return Integer.MAX_VALUE; // 循环滑动

return imageIDs.length;

// return TOTAL_COUNT;

}

@Override

public boolean isViewFromObject(View view, Object object)

{

return (view == object);

}

@Override

public Object instantiateItem(ViewGroup container, int position)

{

System.out.println("pos:" + position);

((ViewPager) container).addView(mImageViews[position % mImageViews.length], 0);

return mImageViews[position % mImageViews.length];

}

@Override

public void destroyItem(ViewGroup container, int position, Object object)

{

((ViewPager) container).removeView((ImageView) object);

}

}

public class MyOnPageChangeListener implements OnPageChangeListener

{

@Override

public void onPageSelected(int position)

{

tvTitle.setText("position = " + position);

setImgBackground(position);

}

@Override

public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels)

{

// 刷新布局

if (viewPagerContainer != null)

{

viewPagerContainer.invalidate();

}

}

@Override

public void onPageScrollStateChanged(int arg0)

{

}

}

/**

* 改变背景图片

* @param position

*/

public void setImgBackground(int position)

{

mImageViews[position].setBackgroundResource(imageIDsFocused[position]);

for (int i = 0; i < mImageViews.length; i++)

{

if (i == position)

{

continue;

} else

{

mImageViews[i].setBackgroundResource(imageIDs[i]);

}

}

}

}