TextView使用Picasso加载带多张图片的Html

在Textview中异步加载带图片的Html文章很多，使用Picasso来异步加载多张时我遇到了onBitmapLoaded()有时候不执行的问题，在stackoverflow上找到了答案。

http://stackoverflow.com/questions/24180805/onbitmaploaded-of-target-object-not-called-on-first-load

大致意思就是说picasso的Target是一个弱引用，有可能就被回收了，所以没有回调。解决方案也写得很清楚，就是把这个Target设置为view的tag，如果是一张图片这是可以解决的。
但是html很可能会有多张图片，那么这里可用setTag(int key,Object obj)这个方法为View设置多个tag来解决。但是这个setTag(int key,Object obj)的key必须是一个resource id，所以目前我的解决方案是先定义一个最大图片数量，如果超出的话应该还是有图片加载不出来，下面上代码：

 public class URLDrawable extends BitmapDrawable {
 protected Bitmap bitmap;

@Override
public void draw(Canvas canvas) {
    if (bitmap != null) {
        canvas.drawBitmap(bitmap, 0, 0, getPaint());
    }
}

}
 

 public class URLImageParser implements Html.ImageGetter {

private TextView mTextView;

private Context context;

private int count = 0;

public URLImageParser(Context context, TextView textView) {
    this.mTextView = textView;
    this.context = context;
}

@Override
public Drawable getDrawable(String source) {
    Log.e("下载网络图片", source);
    return loadImg(source);
}

private URLDrawable loadImg(final String source) {

    final URLDrawable urlDrawable = new URLDrawable();

    final Target target = new Target() {
        @Override
        public void onBitmapLoaded(Bitmap loadedImage, Picasso.LoadedFrom from) {
            Log.e("onBitmapLoaded", "onBitmapLoaded");

            if (loadedImage != null) {
                urlDrawable.bitmap = loadedImage;
                urlDrawable.setBounds(0, 0, loadedImage.getWidth(),
                    loadedImage.getHeight());
                mTextView.invalidate();
                mTextView.setText(mTextView.getText()); // 解决图文重叠
            }
        }

        @Override public void onBitmapFailed(Drawable errorDrawable) {
            Log.e("onBitmapFailed", "onBitmapFailed");
        }

        @Override public void onPrepareLoad(Drawable placeHolderDrawable) {
            Log.e("onPrepareLoad", "onPrepareLoad");
        }
    };

    mTextView.setTag(getId(), target);
    count++;

    Picasso.with(context)
        .load(source)
        //图片宽度撑满
        .resize(SvenUtils.getInstance().getScreenWidth(context) - 100, 0)
        .into(target);
    return urlDrawable;
}

private int getId() {
    int a = count;
    if (count >= 10) {
        a = count % 10;
    }
    switch (a) {
        case 0:
            return R.id.img0;
        case 1:
            return R.id.img1;
        case 2:
            return R.id.img2;
        case 3:
            return R.id.img3;
        case 4:
            return R.id.img4;
        case 5:
            return R.id.img5;
        case 6:
            return R.id.img6;
        case 7:
            return R.id.img7;
        case 8:
            return R.id.img8;
        default:
            return R.id.img9;
    }
}

}