Android 图片浏览功能简单实现（画廊效果实现，支持放大缩小）

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package com.example.androidviewpagerphotopreview;
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.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
public class MainActivity extends Activity implements OnPageChangeListener {
/**
* 用于管理图片的滑动
*/
private ViewPager viewPager;
/**
* 显示当前图片的页数
*/
private TextView pageText;
private int[] image = { R.drawable.one, R.drawable.two, R.drawable.three, R.drawable.four, R.drawable.five, R.drawable.six };
private List<Map<String, Integer>> list = new ArrayList<Map<String, Integer>>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pageText = (TextView) findViewById(R.id.page_text);
viewPager = (ViewPager) findViewById(R.id.view_pager);
for (int i = 0; i < image.length; i++) {
Map<String, Integer> map = new HashMap<String, Integer>();
map.put("image", image[i]);
list.add(map);
}
ViewPagerAdapter adapter = new ViewPagerAdapter(MainActivity.this,list);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(0);
viewPager.setOnPageChangeListener(this);
viewPager.setEnabled(false);
// 设定当前的页数和总页数
pageText.setText(1 + "/" + image.length);
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageSelected(int arg0) {
// 每当页数发生改变时重新设定一遍当前的页数和总页数
pageText.setText((arg0+1) + "/" + image.length);
}
/**
* ViewPager的适配器
*
* @author guolin
*/
class ViewPagerAdapter extends PagerAdapter {
List<Map<String, Integer>> list;
private Context context ;
public ViewPagerAdapter(Context context,List<Map<String, Integer>> lists) {
this.context = context;
this.list=lists;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), list.get(position).get("image"));
if (bitmap == null) {
bitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.empty_photo);
}
View view = LayoutInflater.from(MainActivity.this).inflate(
R.layout.zoom_image_layout, null);
ZoomImageView zoomImageView = (ZoomImageView) view
.findViewById(R.id.zoom_image_view);
zoomImageView.setImageBitmap(bitmap);
container.addView(view);
return view;
}
@Override
public int getCount() {
return list.size();
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
View view = (View) object;
container.removeView(view);
}
}
}