Android-Universal-Image-Loader 异步加载图片
2013-11-08 14:35
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Android-Universal-Image-Loader是Github上一个Android异步加载图片的开源项目。代码写的非常好扩展性很强,使用起来也非常方便,有很多项目都使用了它,比如MediaHouse, UPnP/DLNA Browser,PhotoDownloader for Facebook 等等。更多详细信息可以去Github上查看:https://github.com/nostra13/Android-Universal-Image-Loader
1、在Android Manifest 文件中注册
2、在应用的Application onCreate方法初始化ImageLoader
3、在ListView/GridView中使用ImageLoader
我们也可以在ImageLoader的displayImage 方法中单独指定DisplayImageOptions信息,另外还可以设置图片的角度 比如圆角,这点很棒!
To avoid list (grid, ...) scrolling lags you can use
更多具体用法可以去参考官网上的说明 https://github.com/nostra13/Android-Universal-Image-Loader
效果图
示例源码下载地址:http://download.csdn.net/detail/fx_sky/6522891
1、在Android Manifest 文件中注册
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.universalimageloadertest" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <application android:allowBackup="false" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" android:name=".app.MyApplication"> <activity android:name="com.example.universalimageloadertest.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
2、在应用的Application onCreate方法初始化ImageLoader
package com.example.universalimageloadertest.app; import android.annotation.TargetApi; import android.app.Application; import android.content.Context; import android.os.Build; import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache; import com.nostra13.universalimageloader.core.DisplayImageOptions; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.ImageLoaderConfiguration; import com.nostra13.universalimageloader.core.assist.QueueProcessingType; public class MyApplication extends Application { @TargetApi(Build.VERSION_CODES.GINGERBREAD) @SuppressWarnings("unused") @Override public void onCreate() { // if (Util.DEVELOPER_MODE // && Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) { // StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder() // .detectAll().penaltyDialog().build()); // StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder() // .detectAll().penaltyDeath().build()); // } super.onCreate(); initImageLoader(getApplicationContext()); } public static void initImageLoader(Context context) { // Create default options which will be used for every // displayImage(...) call if no options will be passed to this method DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder() .cacheInMemory(true) .cacheOnDisc(true) .build(); ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context) .threadPoolSize(3)// default .threadPriority(Thread.NORM_PRIORITY - 1)// default .tasksProcessingOrder(QueueProcessingType.LIFO) .memoryCache(new LruMemoryCache(2 * 1024 * 1024)) .memoryCacheSizePercentage(13) // default .defaultDisplayImageOptions(defaultOptions) .writeDebugLogs() // Remove for release app .build(); // Initialize ImageLoader with configuration. ImageLoader.getInstance().init(config); } }
3、在ListView/GridView中使用ImageLoader
package com.example.universalimageloadertest; import java.io.File; import java.util.Collections; import java.util.LinkedList; import java.util.List; import android.app.Activity; import android.graphics.Bitmap; import android.os.Bundle; import android.util.Log; import android.view.KeyEvent; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import com.nostra13.universalimageloader.core.DisplayImageOptions; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.assist.ImageLoadingListener; import com.nostra13.universalimageloader.core.assist.PauseOnScrollListener; import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener; import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer; import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer; import com.nostra13.universalimageloader.utils.StorageUtils; public class MainActivity extends Activity { 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", 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"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 static final String TAG = MainActivity.class.getSimpleName(); private DisplayImageOptions options; private ImageLoader mImageLoader; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initDisplayOptions(); findView(); } private void initDisplayOptions() { options = new DisplayImageOptions.Builder() .showStubImage(R.drawable.ic_stub) //设置正在加载图片 // .showImageOnLoading(R.drawable.ic_stub) //1.8.7新增 .showImageForEmptyUri(R.drawable.ic_empty) .showImageOnFail(R.drawable.ic_error) //设置加载失败图片 .cacheInMemory(true) .cacheOnDisc(true) .displayer(new RoundedBitmapDisplayer(20)) //设置图片角度,0为方形,360为圆角 .build(); mImageLoader = ImageLoader.getInstance(); //缓存目录 //有SD卡 path=/sdcard/Android/data/com.example.universalimageloadertest/cache //无SD卡 path=/data/data/com.example.universalimageloadertest/cache File cacheDir = StorageUtils.getCacheDirectory(this); Log.e(TAG, "cacheDir path="+cacheDir.getAbsolutePath()); } @Override protected void onPause() { // mImageLoader.clearMemoryCache(); // mImageLoader.clearDiscCache(); super.onPause(); } private void findView() { ListView mListView = (ListView) findViewById(R.id.mListView); mListView.setAdapter(new ImageListAdapter()); //设置scroll时停止加载图片 mListView.setOnScrollListener(new PauseOnScrollListener(mImageLoader, true, false)); } class ImageListAdapter extends BaseAdapter { private ImageLoadingListener animateFirstListener = new AnimateFirstDisplayListener(); private class ViewHolder { public TextView text; public ImageView image; } @Override public int getCount() { return imageUrls.length; } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { View view = convertView; final ViewHolder holder; if (convertView == null) { view = getLayoutInflater().inflate(R.layout.item_list_image, parent, false); holder = new ViewHolder(); holder.text = (TextView) view.findViewById(R.id.text); holder.image = (ImageView) view.findViewById(R.id.image); view.setTag(holder); } else { holder = (ViewHolder) view.getTag(); } holder.text.setText("Item " + (position + 1)); // Load image, decode it to Bitmap and return Bitmap to callback // ImageSize targetSize = new ImageSize(100, 100); // result Bitmap will be fit to this size // mImageLoader.loadImage(imageUrls[position], targetSize, animateFirstListener); mImageLoader.displayImage(imageUrls[position], holder.image, options, animateFirstListener); return view; } } private static class AnimateFirstDisplayListener extends SimpleImageLoadingListener { static final List<String> displayedImages = Collections.synchronizedList(new LinkedList<String>()); @Override public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) { if (loadedImage != null) { ImageView imageView = (ImageView) view; boolean firstDisplay = !displayedImages.contains(imageUri); if (firstDisplay) { FadeInBitmapDisplayer.animate(imageView, 500); // FadeInBitmapDisplayer.animate(imageView, 500); displayedImages.add(imageUri); } } } } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { this.finish(); // finish当前activity AnimateFirstDisplayListener.displayedImages.clear(); return true; } return super.onKeyDown(keyCode, event); } }
我们也可以在ImageLoader的displayImage 方法中单独指定DisplayImageOptions信息,另外还可以设置图片的角度 比如圆角,这点很棒!
To avoid list (grid, ...) scrolling lags you can use
PauseOnScrollListener:
boolean pauseOnScroll = false; // or true boolean pauseOnFling = true; // or false PauseOnScrollListener listener = new PauseOnScrollListener(imageLoader, pauseOnScroll, pauseOnFling); listView.setOnScrollListener(listener);
更多具体用法可以去参考官网上的说明 https://github.com/nostra13/Android-Universal-Image-Loader
效果图
示例源码下载地址:http://download.csdn.net/detail/fx_sky/6522891
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