图片放大缩小（和ViewPager配合使用流畅显示）--第三方开源--PhotoView

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;
        }

    }

}