Question

我正在编写一个应用程序来显示网站上的帖子并使用Html.fromHtml来执行此操作。但是，如果我打开一篇文章，它会立即使用大约25MB的内存来加载图像。这是可以接受的，即使图像存储在设备上，只重新加载同一篇文章会导致另外25MB的跳转。我环顾四周，尝试了大量的解决方案。我觉得我只需要回收位图，我不知道该怎么做。这是代码：

public class ImageGetter implements Html.ImageGetter {
private Context c;
private TextView container;
private ImageLoader imageLoader;
private DisplayImageOptions options;
private UrlImageDownloader urlDrawable;

public ImageGetter(View t, Context c) {
    this.c = c;
    this.container = (TextView)t;

    imageLoader = ImageLoader.getInstance();
    options = new DisplayImageOptions.Builder().cacheOnDisk(true).cacheInMemory(false).imageScaleType(ImageScaleType.EXACTLY)
            .showImageOnLoading(R.color.darkcolorPrimary).bitmapConfig(Bitmap.Config.RGB_565).resetViewBeforeLoading(true).build();
}

@Override
public Drawable getDrawable(String source) {
    urlDrawable = new UrlImageDownloader(c.getResources(), source);
    imageLoader.loadImage(source, options, new SimpleListener(urlDrawable));
    return urlDrawable;
}

private class SimpleListener extends SimpleImageLoadingListener
{
    UrlImageDownloader urlImageDownloader;

    public SimpleListener(UrlImageDownloader downloader) {
        super();
        urlImageDownloader = downloader;
    }

    @Override
    public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
        int width = loadedImage.getWidth();
        int height = loadedImage.getHeight();

        int newWidth = width;
        int newHeight = height;

        if( width > container.getWidth() ) {
            newWidth = container.getWidth();
            newHeight = (newWidth * height) / width;
        }

        Drawable result = new BitmapDrawable(c.getResources(), loadedImage);
        result.setBounds(0, 0, newWidth, newHeight);

        urlImageDownloader.setBounds(0, 0, newWidth, newHeight);
        urlImageDownloader.drawable = result;

        container.setText(container.getText());
    }
}

public class UrlImageDownloader extends BitmapDrawable
{
    public Drawable drawable;

    /**
     * Create a drawable by decoding a bitmap from the given input stream.
     *
     * @param res
     * @param is
     */
    public UrlImageDownloader(Resources res, InputStream is) {
        super(res, is);
    }

    /**
     * Create a drawable by opening a given file path and decoding the bitmap.
     *
     * @param res
     * @param filepath
     */
    public UrlImageDownloader(Resources res, String filepath) {
        super(res, filepath);
        drawable = new BitmapDrawable(res, filepath);
    }

    /**
     * Create drawable from a bitmap, setting initial target density based on
     * the display metrics of the resources.
     *
     * @param res
     * @param bitmap
     */
    public UrlImageDownloader(Resources res, Bitmap bitmap) {
        super(res, bitmap);
    }

    @Override
    public void draw(Canvas canvas) {
        // override the draw to facilitate refresh function later
        if(drawable != null) {
            drawable.draw(canvas);
        }
    }
}

}

Answer 1

解决。存在内存泄漏涉及存储图像的TextView。如果您遇到这样的问题，我建议使用Eclipse MAT来识别内存泄漏。

Answer 2

您可以通过调用recycle方法删除位图。但是它自己不会做太多，你应该通过调用System.gc()来调用垃圾收集器，然后将它从内存中清除。

使用ImageGetter从HTML中抓取图像时出现内存不足错误

2 个答案: