Volley 的 NetworkImageView - setImageBitmap 方法不起作用

Question

我在我的项目中使用 volley 库。

我通常让 NetworkImageView 使用 setImageUrl 方法下载图片：

networkImageView.setImageUrl(imageUrl, mImageLoader)

这很好，但是..当我尝试使用 ImageLoader 的 get 方法“手动”下载位图，然后自己设置位图时，它不起作用：

mImageLoader.get(imageUrl,new ImageLoader.ImageListener()
    {
        @Override
        public void onResponse(ImageLoader.ImageContainer imageContainer, boolean b)
        {
            if (imageContainer.getBitmap() != null)
            {
                networkImageView.setImageBitmap(imageContainer.getBitmap());
            }
        }

        @Override
        public void onErrorResponse(VolleyError volleyError)
        {

        }
    });

networkImageView.setImageBitmap(imageContainer.getBitmap()) 行什么都不做。

怎么可能？ 提前致谢！

Answer 1

这个版本的NetworkImageView 修复了这个问题。

public class CustomNetworkImageView extends NetworkImageView {

    private Bitmap  mLocalBitmap;

    private boolean mShowLocal;

    public void setLocalImageBitmap(Bitmap bitmap) {
        if (bitmap != null) {
            mShowLocal = true;
        }
        this.mLocalBitmap = bitmap;
        requestLayout();
    }

    @Override
    public void setImageUrl(String url, ImageLoader imageLoader) {
        mShowLocal = false;
        super.setImageUrl(url, imageLoader);
    }

    public CustomNetworkImageView(Context context) {
        this(context, null);
    }

    public CustomNetworkImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CustomNetworkImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {

    super.onLayout(changed, left, top, right, bottom);
    if (mShowLocal) {
            setImageBitmap(mLocalBitmap);
        }
    }

}

Answer 2

你可以通过在NetWorkImageView的源代码中添加几行代码来实现（我想你有权编辑源代码，如果你不能，你可以扩展NetWorkImageView，很容易） .

public class NetworkImageView extends ImageView {
    private Bitmap bitmap;
    public void setLocalImageBitmap(Bitmap bitmap){
        this.bitmap=bitmap;
    }
    /**The volley verison of NetworkImageView has This method, you just need to add
    a new condition, which is else if(bitmap!=null).
    **/
    private void setDefaultImageOrNull() {
    if(mDefaultImageId != 0) {
        setImageResource(mDefaultImageId);
    }
    else if(bitmap!=null){
        setImageBitmap(bitmap);
    }
    else {
        setImageBitmap(null);
    }
}

}

Answer 3

接受的答案对我不起作用...以下代码有效：

    public class CustomNetworkImageView extends NetworkImageView {
    Context mContext;
    public CustomNetworkImageView(Context context) {
        super(context);
        mContext = context;
    }

    public CustomNetworkImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
        mContext = context;
    }

    public CustomNetworkImageView(Context context, AttributeSet attrs, int defStyle){
        super(context, attrs, defStyle);
        mContext = context;
    }

    @Override
    public void setImageBitmap(Bitmap bm) {
        if (bm == null) return;
        setImageDrawable(new BitmapDrawable(mContext.getResources(), bm));
    }
}

Answer 4

正如 Lefteris 所提到的，如果您使用侦听器范例加载，只需使用普通的 ImageView。这对我有用。

Answer 5

您也可以通过图像加载器设置本地位图，而不是触摸 NetworkImageView

 imageSaver = new ImageLoader(VolleyWebServiceManager.getInstance().getRequestQueue(), new ImageLoader.ImageCache() {
        private final LruCache<String, Bitmap> mCache = new LruCache<String, Bitmap>(50);

        public void putBitmap(String url, Bitmap bitmap) {
            mCache.put(url, bitmap);
            FileManager.getInstance().saveImage(bitmap, FileManager.getInstance().getLastPathComponent(url), true, false);
        }

        public Bitmap getBitmap(String url) {
            // Puts the bitmap from the file system into the cache
            if (mCache.get(url) == null && FileManager.getInstance().getLocalImage(FileManager.getInstance().getLastPathComponent(url)) != null) {
                putBitmap(url, FileManager.getInstance().getLocalImage(FileManager.getInstance().getLastPathComponent(url)));
            }
            return mCache.get(url);
        }
    });

Answer 6

获取它将使用完整的 NetworkImageView url。

private static CustomVolleyRequestQueue mInstance;
private static Context mCtx;
private RequestQueue mRequestQueue;
private ImageLoader mImageLoader;


private CustomVolleyRequestQueue(Context context) {
    mCtx = context;
    mRequestQueue = getRequestQueue();

    mImageLoader = new ImageLoader(mRequestQueue,
            new ImageLoader.ImageCache() {
                private final LruCache<String, Bitmap>
                        cache = new LruCache<String, Bitmap>(20);

                @Override
                public Bitmap getBitmap(String url) {
                    return cache.get(url);
                }

                @Override
                public void putBitmap(String url, Bitmap bitmap) {
                    cache.put(url, bitmap);
                }
            });
}

public static synchronized CustomVolleyRequestQueue getInstance(Context context) {
    if (mInstance == null) {
        mInstance = new CustomVolleyRequestQueue(context);
    }
    return mInstance;
}

public RequestQueue getRequestQueue() {
    if (mRequestQueue == null) {
        Cache cache = new DiskBasedCache(mCtx.getCacheDir(), 10 * 1024 * 1024);
        Network network = new BasicNetwork(new HurlStack());
        mRequestQueue = new RequestQueue(cache, network);
        // Don't forget to start the volley request queue
        mRequestQueue.start();
    }
    return mRequestQueue;
}

public ImageLoader getImageLoader() {
    return mImageLoader;
}