图片的放大缩小实现效果是使用的github上的一个开源项目photoView实现的,下载地址:https://github.com/chrisbanes/PhotoView

下面看测试代码:

activity_main.xml:

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

MainActivity.java:

 package com.zzw.tetsphotoview;

 import java.util.ArrayList;
import java.util.List; import uk.co.senab.photoview.PhotoViewAttacher; import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView; public class MainActivity extends Activity {
ViewPager mViewPager;
List<ImageView> imageViews; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mViewPager = (ViewPager) findViewById(R.id.viewPager);
mViewPager.setAdapter(new ImageAdapter(this));
} class ImageAdapter extends PagerAdapter {
Context context;
int[] images; public void init() {
imageViews = new ArrayList<ImageView>();
images = new int[] { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d };
for (int i = 0; i < images.length; i++) {
ImageView image = new ImageView(context);
image.setImageResource(images[i]); //使图片实现可以放大缩小的功能
PhotoViewAttacher mAttacher=new PhotoViewAttacher(image);
imageViews.add(image); }
// for (int i : images) {
// ImageView image = new ImageView(context);
// image.setImageResource(i);
// imageViews.add(image);
// }
} public ImageAdapter(Context context) {
this.context = context;
init();
} @Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(imageViews.get(position));
} @Override
public View instantiateItem(ViewGroup container, int position) {
container.addView(imageViews.get(position)); return imageViews.get(position);
} @Override
public int getCount() {
return imageViews.size();
} @Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
} } }