Android ListView 异步加载图片
2013-09-24 11:30
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使用ListView、GridView来展示图片是项目中经常遇到的情况,这里使用官方文档的BitmapFun稍作修改实现ListView 异步加载图片效果。
实现原理:给ListView 注册一个 滚动监听器,监听的ListView的滚动状态,为了不影响用户滑动ListView 感觉卡顿,只有当ListView处于静止或者触摸状态时才去开启后台线程下载图片,处于滚动状态时后台的线程应该 暂停加载图片。
工程目录结构如下:
最后实现的效果如下:
第一次进入时
滑动ListView时
activity_main.xml布局文件
ImageItem.java
MainActivity.java
util包中的代码就不贴了,完全取自官方文档BitmapFun 里面的代码,大家可以下载工程后自己去研究。
最后附上工程下载地址:http://download.csdn.net/detail/fx_sky/6312015
实现原理:给ListView 注册一个 滚动监听器,监听的ListView的滚动状态,为了不影响用户滑动ListView 感觉卡顿,只有当ListView处于静止或者触摸状态时才去开启后台线程下载图片,处于滚动状态时后台的线程应该 暂停加载图片。
工程目录结构如下:
最后实现的效果如下:
第一次进入时
滑动ListView时
activity_main.xml布局文件
<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" tools:context=".MainActivity" > <ListView android:id="@+id/mListView" android:layout_width="match_parent" android:layout_height="match_parent" android:cacheColorHint="@android:color/transparent"/> </RelativeLayout>
ImageItem.java
package com.example.lrucachetest; public class ImageItem { private String url; private String desc; public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getDesc() { return desc; } public void setDesc(String desc) { this.desc = desc; } }
MainActivity.java
package com.example.lrucachetest; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import com.example.lrucachetest.util.ImageCache.ImageCacheParams; import com.example.lrucachetest.util.ImageFetcher; public class MainActivity extends FragmentActivity { public final static String[] imageUrls = new String[] { "https://lh6.googleusercontent.com/-55osAWw3x0Q/URquUtcFr5I/AAAAAAAAAbs/rWlj1RUKrYI/s1024/A%252520Photographer.jpg", "https://lh4.googleusercontent.com/--dq8niRp7W4/URquVgmXvgI/AAAAAAAAAbs/-gnuLQfNnBA/s1024/A%252520Song%252520of%252520Ice%252520and%252520Fire.jpg", "https://lh5.googleusercontent.com/-7qZeDtRKFKc/URquWZT1gOI/AAAAAAAAAbs/hqWgteyNXsg/s1024/Another%252520Rockaway%252520Sunset.jpg", "https://lh3.googleusercontent.com/--L0Km39l5J8/URquXHGcdNI/AAAAAAAAAbs/3ZrSJNrSomQ/s1024/Antelope%252520Butte.jpg", "https://lh6.googleusercontent.com/-8HO-4vIFnlw/URquZnsFgtI/AAAAAAAAAbs/WT8jViTF7vw/s1024/Antelope%252520Hallway.jpg", "https://lh4.googleusercontent.com/-WIuWgVcU3Qw/URqubRVcj4I/AAAAAAAAAbs/YvbwgGjwdIQ/s1024/Antelope%252520Walls.jpg", "https://lh6.googleusercontent.com/-UBmLbPELvoQ/URqucCdv0kI/AAAAAAAAAbs/IdNhr2VQoQs/s1024/Apre%2525CC%252580s%252520la%252520Pluie.jpg", "https://lh3.googleusercontent.com/-s-AFpvgSeew/URquc6dF-JI/AAAAAAAAAbs/Mt3xNGRUd68/s1024/Backlit%252520Cloud.jpg", "https://lh5.googleusercontent.com/-bvmif9a9YOQ/URquea3heHI/AAAAAAAAAbs/rcr6wyeQtAo/s1024/Bee%252520and%252520Flower.jpg", "https://lh5.googleusercontent.com/-n7mdm7I7FGs/URqueT_BT-I/AAAAAAAAAbs/9MYmXlmpSAo/s1024/Bonzai%252520Rock%252520Sunset.jpg", "https://lh6.googleusercontent.com/-4CN4X4t0M1k/URqufPozWzI/AAAAAAAAAbs/8wK41lg1KPs/s1024/Caterpillar.jpg", "https://lh3.googleusercontent.com/-rrFnVC8xQEg/URqufdrLBaI/AAAAAAAAAbs/s69WYy_fl1E/s1024/Chess.jpg", "https://lh5.googleusercontent.com/-WVpRptWH8Yw/URqugh-QmDI/AAAAAAAAAbs/E-MgBgtlUWU/s1024/Chihuly.jpg", "https://lh5.googleusercontent.com/-0BDXkYmckbo/URquhKFW84I/AAAAAAAAAbs/ogQtHCTk2JQ/s1024/Closed%252520Door.jpg", "https://lh3.googleusercontent.com/-PyggXXZRykM/URquh-kVvoI/AAAAAAAAAbs/hFtDwhtrHHQ/s1024/Colorado%252520River%252520Sunset.jpg", "https://lh3.googleusercontent.com/-ZAs4dNZtALc/URquikvOCWI/AAAAAAAAAbs/DXz4h3dll1Y/s1024/Colors%252520of%252520Autumn.jpg", "https://lh4.googleusercontent.com/-GztnWEIiMz8/URqukVCU7bI/AAAAAAAAAbs/jo2Hjv6MZ6M/s1024/Countryside.jpg", "https://lh4.googleusercontent.com/-bEg9EZ9QoiM/URquklz3FGI/AAAAAAAAAbs/UUuv8Ac2BaE/s1024/Death%252520Valley%252520-%252520Dunes.jpg", 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"https://lh5.googleusercontent.com/-Hy9k-TbS7xg/URqvIjQMOxI/AAAAAAAAAbs/RSpmmOATSkg/s1024/Tokyo%252520Highway.jpg", "https://lh6.googleusercontent.com/-83oOvMb4OZs/URqvJL0T7lI/AAAAAAAAAbs/c5TECZ6RONM/s1024/Tokyo%252520Smog.jpg", "https://lh3.googleusercontent.com/-FB-jfgREEfI/URqvJI3EXAI/AAAAAAAAAbs/XfyweiRF4v8/s1024/Tufa%252520at%252520Night.jpg", "https://lh4.googleusercontent.com/-vngKD5Z1U8w/URqvJUCEgPI/AAAAAAAAAbs/ulxCMVcU6EU/s1024/Valley%252520Sunset.jpg", "https://lh6.googleusercontent.com/-DOz5I2E2oMQ/URqvKMND1kI/AAAAAAAAAbs/Iqf0IsInleo/s1024/Windmill%252520Sunrise.jpg", "https://lh5.googleusercontent.com/-biyiyWcJ9MU/URqvKculiAI/AAAAAAAAAbs/jyPsCplJOpE/s1024/Windmill.jpg", "https://lh4.googleusercontent.com/-PDT167_xRdA/URqvK36mLcI/AAAAAAAAAbs/oi2ik9QseMI/s1024/Windmills.jpg", "https://lh5.googleusercontent.com/-kI_QdYx7VlU/URqvLXCB6gI/AAAAAAAAAbs/N31vlZ6u89o/s1024/Yet%252520Another%252520Rockaway%252520Sunset.jpg", "https://lh4.googleusercontent.com/-e9NHZ5k5MSs/URqvMIBZjtI/AAAAAAAAAbs/1fV810rDNfQ/s1024/Yosemite%252520Tree.jpg", }; private List<ImageItem> mList; private ImageFetcher mImageFetcher; private int mImageThumbSize; private static final String IMAGE_CACHE_DIR = "thumbs"; private ImageAdapter mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mImageThumbSize = getResources().getDimensionPixelSize( R.dimen.image_display_size); ImageCacheParams cacheParams = new ImageCacheParams(this, IMAGE_CACHE_DIR); cacheParams.setMemCacheSizePercent(0.25f); // Set memory cache to 25% of app memory mImageFetcher = new ImageFetcher(this, mImageThumbSize); mImageFetcher.setLoadingImage(R.drawable.empty_photo); mImageFetcher.addImageCache(getSupportFragmentManager(), cacheParams); initAppData(); findView(); } private void initAppData() { mList = new ArrayList<ImageItem>(); for (int i = 0; i < imageUrls.length; i++) { ImageItem it = new ImageItem(); it.setUrl(imageUrls[i]); it.setDesc("LRUCache Test API" + (i + 1)); mList.add(it); } } private void findView() { ListView mListView = (ListView) findViewById(R.id.mListView); mAdapter = new ImageAdapter(this, mList); mListView.setAdapter(mAdapter); mListView.setOnScrollListener(new OnScrollListener() { @Override public void onScrollStateChanged(AbsListView view, int scrollState) { if(scrollState == AbsListView.OnScrollListener.SCROLL_STATE_FLING) { mImageFetcher.setPauseWork(true); } else { mImageFetcher.setPauseWork(false); } } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { // TODO Auto-generated method stub } }); } @Override public void onResume() { super.onResume(); mImageFetcher.setExitTasksEarly(false); mAdapter.notifyDataSetChanged(); } @Override public void onPause() { super.onPause(); mImageFetcher.setPauseWork(false); mImageFetcher.setExitTasksEarly(true); mImageFetcher.flushCache(); } @Override public void onDestroy() { super.onDestroy(); mImageFetcher.closeCache(); } private class ImageAdapter extends BaseAdapter { private Context context; private List<ImageItem> list; private LayoutInflater mInflater; public ImageAdapter(Context context, List<ImageItem> list) { this.context = context; this.list = list; mInflater = LayoutInflater.from(context); } @Override public int getCount() { // TODO Auto-generated method stub return list.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return list.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView == null) { holder = new ViewHolder(); convertView = mInflater.inflate(R.layout.list_item, null); holder.iv_photo = (ImageView) convertView .findViewById(R.id.iv_photo); holder.tv_desc = (TextView) convertView .findViewById(R.id.tv_desc); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } ImageItem it = list.get(position); mImageFetcher.loadImage(it.getUrl(), holder.iv_photo); holder.tv_desc.setText(it.getDesc()); return convertView; } } static class ViewHolder { TextView tv_desc; ImageView iv_photo; } }
util包中的代码就不贴了,完全取自官方文档BitmapFun 里面的代码,大家可以下载工程后自己去研究。
最后附上工程下载地址:http://download.csdn.net/detail/fx_sky/6312015
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