Async ImageGetter无法正常运行

Question

我试图按照此主题中的信息异步下载来自html的内嵌图像：Android HTML ImageGetter as AsyncTask

我可以让图片下载好。但是！

这就是最终结果：

如果我不以异步方式下载它们，它应该看起来如何以及它看起来如何：

有关如何解决此问题的任何想法？ 提前谢谢。

编辑：

我的URLImageParser代码：

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();
    }
}

和URLDrawable的代码

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

Answer 1

我找到了解决此问题的方法。 您必须保留对TextView实例的引用，并且在下载图像后，您必须使用onPostExecute方法中的相同文本调用setText：

@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());
}

这会强制TextView重新布局其内容。