异步ImageGetter不正常 [英] Async ImageGetter not functioning properly

问题描述

我试图从异步下载HTML内嵌图片，下面在这个线程的信息：的Andr​​oid HTML ImageGetter为AsyncTask的

我可以使图像下载好了。但是！

这是如何结束：

这是它应该如何看它的外观，如果我不异步下载它们：

任何想法，这可怎么解决吗？
谢谢你在前进。

编辑：

code我URLImageParser：

 公共URLImageParser（查看T，上下文C）
{
    this.c = C;
    this.container = T;
}公众可绘制getDrawable（字符串源）
{
    URLDrawable urlDrawable =新URLDrawable（）;    ImageGetterAsyncTask的AsyncTask =新ImageGetterAsyncTask（urlDrawable）;    asyncTask.execute（源）;    返回urlDrawable;
}公共类ImageGetterAsyncTask扩展的AsyncTask＆LT;弦乐，太虚，可绘制＆GT;
{
    URLDrawable urlDrawable;    公共ImageGetterAsyncTask（URLDrawable D）
    {
        this.urlDrawable = D;
    }    @覆盖
    保护可绘制doInBackground（字符串... PARAMS）
    {
        字符串源=参数[0];
        返回fetchDrawable（源）;
    }    @覆盖
    保护无效onPostExecute（可绘制结果）
    {
        urlDrawable.setBounds（0，0，0 + result.getIntrinsicWidth（），0
                + result.getIntrinsicHeight（））;        urlDrawable.drawable =结果;        URLImageParser.this.container.invalidate（）;
    }    公众可绘制fetchDrawable（字符串urlString）
    {
        尝试{
            InputStream为=取（urlString）;
            可绘制可绘制= Drawable.createFromStream（是，SRC）;
            drawable.setBounds（0，0，0 + drawable.getIntrinsicWidth（），0
                    + drawable.getIntrinsicHeight（））;
            返回绘制;
        }
        赶上（例外五）
        {
            返回null;
        }
    }    私人的InputStream获取（字符串urlString）抛出异常
    {
        DefaultHttpClient的HttpClient =新DefaultHttpClient（）;
        HTTPGET请求=新HTTPGET（urlString）;
        HTT presponse响应= httpClient.execute（请求）;
        返回response.getEntity（）的getContent（）。
    }
}
 

而code为URLDrawable

  @覆盖
公共无效画（油画画布）
{
    如果（绘！= NULL）
    {
        drawable.draw（画布）;
    }
}
 

解决方案

我发现了这个问题的解决方法。
你必须保持到TextView的实例的引用，图像被下载后，你有你的onPostExecute方法调用的setText具有相同的文字：

  @覆盖
保护无效onPostExecute（可绘制结果）
{
    urlDrawable.setBounds（0，0，0 + result.getIntrinsicWidth（），0
            + result.getIntrinsicHeight（））;    urlDrawable.drawable =结果;    // mTextView是参考TextView的实例
    mTextView.setText（mTextView.getText（））;
}
 

这迫使TextView的重新布局其内容。

I was trying to download inline images from html asynchronously, following the information in this thread: Android HTML ImageGetter as AsyncTask

I could make the images download okay. BUT!

This is how it ends up:

This is how it is supposed to look and how it looks if I don't download them asynchronously:

Any ideas to how this can be fixed? Thank you in advance.

EDIT:

Code for my URLImageParser:

public URLImageParser( View t, Context c )
{
    this.c = c;
    this.container = t;
}

public Drawable getDrawable( String source )
{
    URLDrawable urlDrawable = new URLDrawable();

    ImageGetterAsyncTask asyncTask = new ImageGetterAsyncTask( urlDrawable );

    asyncTask.execute( source );

    return urlDrawable;
}

public class ImageGetterAsyncTask extends AsyncTask<String, Void, Drawable>
{
    URLDrawable urlDrawable;

    public ImageGetterAsyncTask( URLDrawable d )
    {
        this.urlDrawable = d;
    }

    @Override
    protected Drawable doInBackground( String... params )
    {
        String source = params[0];
        return fetchDrawable( source );
    }

    @Override
    protected void onPostExecute( Drawable result )
    {
        urlDrawable.setBounds( 0, 0, 0 + result.getIntrinsicWidth(), 0
                + result.getIntrinsicHeight() );

        urlDrawable.drawable = result;

        URLImageParser.this.container.invalidate();
    }

    public Drawable fetchDrawable( String urlString )
    {
        try {
            InputStream is = fetch( urlString );
            Drawable drawable = Drawable.createFromStream( is, "src" );
            drawable.setBounds( 0, 0, 0 + drawable.getIntrinsicWidth(), 0
                    + drawable.getIntrinsicHeight() );
            return drawable;
        }
        catch ( Exception e )
        {
            return null;
        }
    }

    private InputStream fetch( String urlString ) throws Exception
    {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet request = new HttpGet( urlString );
        HttpResponse response = httpClient.execute( request );
        return response.getEntity().getContent();
    }
}

And the code for URLDrawable

@Override
public void draw( Canvas canvas )
{
    if( drawable != null )
    {
        drawable.draw( canvas );
    }
}

解决方案

I've found a workaround for this problem. You have to keep a reference to the TextView instance and after the image is being downloaded you have to call setText with the same text in your onPostExecute method:

@Override
protected void onPostExecute( Drawable result )
{
    urlDrawable.setBounds( 0, 0, 0 + result.getIntrinsicWidth(), 0
            + result.getIntrinsicHeight() );

    urlDrawable.drawable = result;

    // mTextView is the reference to the TextView instance
    mTextView.setText(mTextView.getText());
}

This forces the TextView to re-layout its content.

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