Android中Universal Image Loader开源框架的简单使用

<!-- Include following permission if you load images from Internet -->
    <uses-permission android:name="android.permission.INTERNET" />
    <!-- Include following permission if you want to cache images on SD card -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<application
        android:name="com.topcsa.zhj_imageloder.MyApplication"

public class MyApplication extends Application {
    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
                this)
                .memoryCacheExtraOptions(480, 800)
                // 缓存在内存的图片的宽和高度
                // default = device screen dimensions
                .diskCacheExtraOptions(480, 800, null)
                .threadPoolSize(3)
                // 线程池内加载的数量
                .threadPriority(Thread.NORM_PRIORITY - 2)
                .tasksProcessingOrder(QueueProcessingType.FIFO)
                .denyCacheImageMultipleSizesInMemory()
                .memoryCache(new LruMemoryCache(2 * 1024 * 1024))//你可以通过自己的内存缓存实现
                .memoryCacheSize(3 * 1024 * 1024)// 缓存到内存的最大数据
                .memoryCacheSizePercentage(13)
                .diskCacheSize(50 * 1024 * 1024)// //缓存到文件的最大数据
                .diskCacheFileCount(100)// 文件数量
                .diskCacheFileNameGenerator(new Md5FileNameGenerator())//将保存的时候的URI名称用MD5 加密
                .imageDownloader(new BaseImageDownloader(this)) // default
                .defaultDisplayImageOptions(DisplayImageOptions.createSimple()) // default
                .writeDebugLogs()// Remove for release app
                .build();
        // Initialize ImageLoader with configuration.
        ImageLoader.getInstance().init(config);// 初始化
    }

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <GridView
        android:id="@+id/gridview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center"
        android:horizontalSpacing="4dip"
        android:numColumns="3"
        android:padding="4dip"
        android:stretchMode="columnWidth"
        android:verticalSpacing="4dip" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="120dip">

    <ImageView
        android:id="@+id/image"
        android:layout_width="match_parent"
        android:layout_height="120dip"
        android:adjustViewBounds="true"
        android:contentDescription="Image"
        android:scaleType="centerCrop" />

    <ProgressBar
        android:id="@+id/progress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:indeterminate="false"
        android:max="100"
        android:layout_gravity="bottom"
        style="@style/ProgressBarStyle" />
</FrameLayout>

DisplayImageOptions options;
options = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.drawable.ic_stub)// //默认图片
                .showImageForEmptyUri(R.drawable.ic_empty)// url为空时展示的图片
                .showImageOnFail(R.drawable.ic_error)// 图片加载失败时的图片
                .cacheInMemory(true)// 缓存到内存
                .cacheOnDisk(true)// 缓存到磁盘
                .considerExifParams(true)// Sets whether ImageLoader will
                                            // consider EXIF parameters of JPEG
                                            // image (rotate, flip)
                .displayer(new RoundedBitmapDisplayer(5))// 图片圆角显示
                .bitmapConfig(Bitmap.Config.RGB_565).build();

// Load image, decode it to Bitmap and display Bitmap in ImageView (or any other view 
//  which implements ImageAware interface)
imageLoader.displayImage(imageUri, imageView);

// Load image, decode it to Bitmap and return Bitmap to callback
imageLoader.loadImage(imageUri, new SimpleImageLoadingListener() {
    @Override
    public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
        // Do whatever you want with Bitmap
    }
});

// Load image, decode it to Bitmap and return Bitmap synchronously
Bitmap bmp = imageLoader.loadImageSync(imageUri);

// Load image, decode it to Bitmap and display Bitmap in ImageView (or any other view 
//  which implements ImageAware interface)
imageLoader.displayImage(imageUri, imageView, options, new ImageLoadingListener() {
    @Override
    public void onLoadingStarted(String imageUri, View view) {
        ...
    }
    @Override
    public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
        ...
    }
    @Override
    public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
        ...
    }
    @Override
    public void onLoadingCancelled(String imageUri, View view) {
        ...
    }
}, new ImageLoadingProgressListener() {
    @Override
    public void onProgressUpdate(String imageUri, View view, int current, int total) {
        ...
    }
});

// Load image, decode it to Bitmap and return Bitmap to callback
ImageSize targetSize = new ImageSize(80, 50); // result Bitmap will be fit to this size
imageLoader.loadImage(imageUri, targetSize, options, new SimpleImageLoadingListener() {
    @Override
    public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
        // Do whatever you want with Bitmap
    }
});

// Load image, decode it to Bitmap and return Bitmap synchronously
ImageSize targetSize = new ImageSize(80, 50); // result Bitmap will be fit to this size
Bitmap bmp = imageLoader.loadImageSync(imageUri, targetSize, options);

public class MainActivity extends Activity {

    DisplayImageOptions options;
    String[] imageUrls = Constants.imageThumbUrls;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        options = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.drawable.ic_stub)// //默认图片
                .showImageForEmptyUri(R.drawable.ic_empty)// url为空时展示的图片
                .showImageOnFail(R.drawable.ic_error)// 图片加载失败时的图片
                .cacheInMemory(true)// 缓存到内存
                .cacheOnDisk(true)// 缓存到磁盘
                .considerExifParams(true)// Sets whether ImageLoader will
                                            // consider EXIF parameters of JPEG
                                            // image (rotate, flip)
                .displayer(new RoundedBitmapDisplayer(5))// 图片圆角显示
                .bitmapConfig(Bitmap.Config.RGB_565).build();

        GridView gv = (GridView) findViewById(R.id.gridview);
        gv.setAdapter(new myAdapter());

    }

    class myAdapter extends BaseAdapter {
        private LayoutInflater inflater;

        myAdapter() {
            inflater = LayoutInflater.from(MainActivity.this);
        }

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return imageUrls.length;
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return imageUrls[position];
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            final ViewHolder holder;
            if (convertView == null) {
                convertView = inflater.inflate(R.layout.item_grid_image,
                        parent, false);
                holder = new ViewHolder();
                holder.imageView = (ImageView) convertView
                        .findViewById(R.id.image);
                holder.progressBar = (ProgressBar) convertView
                        .findViewById(R.id.progress);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            // Complete(完整的使用方法)
            // 有简单的使用方法，这里未展示
            ImageLoader.getInstance().displayImage(imageUrls[position],
                    holder.imageView, options,
                    new SimpleImageLoadingListener() {
                        @Override
                        public void onLoadingStarted(String imageUri, View view) {
                            holder.progressBar.setProgress(0);
                            holder.progressBar.setVisibility(View.VISIBLE);
                        }

                        @Override
                        public void onLoadingFailed(String imageUri, View view,
                                FailReason failReason) {
                            holder.progressBar.setVisibility(View.GONE);
                        }

                        @Override
                        public void onLoadingComplete(String imageUri,
                                View view, Bitmap loadedImage) {
                            holder.progressBar.setVisibility(View.GONE);
                        }
                    }, new ImageLoadingProgressListener() {
                        @Override
                        public void onProgressUpdate(String imageUri,
                                View view, int current, int total) {
                            holder.progressBar.setProgress(Math.round(100.0f
                                    * current / total));
                        }
                    });
            return convertView;
        }

    }

    static class ViewHolder {
        ImageView imageView;
        ProgressBar progressBar;
    }

}