文本和图像的自定义列表视图

Question

我开发了一个列表视图，列表视图显示图像和文本.1必须下载图像和文本形式的网络服务，然后必须显示，因为它需要更多的时间，所以我们认为第一次绑定文本在列表视图和使用AsyncTask，一旦图像下载图像将在活动的背景中显示在列表视图中。但我无法做到这一点，我已经做了一些编码，它下载所有图像，然后绑定图像和文本（在这种情况下我们需要下载image.So后前startDownload图像和2月1日两次绑定列表视图，如果任何有一些想法，请给我建议。

代码

public class LoadImg extends AsyncTask<String, Void, Bitmap> { 
    Context context; 
    String img; 
    InputStream is = null; 
    Bitmap bitmap = null; 

    public LoadImg(Context context, String img) { 
     // TODO Auto-generated constructor stub 
     this.context = context; 
     this.img = img; 
    } 

    @Override 
    protected Bitmap doInBackground(String... params) { 
     // TODO Auto-generated method stub 
     Bitmap bitmap = downImg(); 
     System.out 
       .println("Value of bitmap=====================================" 
         + bitmap); 
     return bitmap; 
    } 

    private Bitmap downImg() { 
     // TODO Auto-generated method stub 
     Bitmap bitmap = null; 
     if (img == null) { 
      bitmap = null; 
     } else { 

      URL url = null; 
      try { 
       url = new URL(img); 

      } catch (MalformedURLException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 

      } 
      URLConnection connection = null; 
      try { 

       connection = url.openConnection(); 

      } catch (IOException e1) { 
       // TODO Auto-generated catch block 
       e1.printStackTrace(); 
      } 
      try { 
       is = connection.getInputStream(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      bitmap = BitmapFactory.decodeStream(is); 
      System.out.println("TV Image===" + bitmap); 
     } 

     return bitmap; 
    } 

} 

Answer 1

试试这个example或使用任何适配器这样

WeatherAdapter.java

public class WeatherAdapter extends ArrayAdapter<Weather>{ 

Context context; 
int layoutResourceId; 
Weather data[] = null; 

public WeatherAdapter(Context context, int layoutResourceId, Weather[] data) { 
    super(context, layoutResourceId, data); 
    this.layoutResourceId = layoutResourceId; 
    this.context = context; 
    this.data = data; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    View row = convertView; 
    WeatherHolder holder = null; 

    if(row == null) 
    { 
     LayoutInflater inflater = ((Activity)context).getLayoutInflater(); 
     row = inflater.inflate(layoutResourceId, parent, false); 

     holder = new WeatherHolder(); 
     holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon); 
     holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle); 

     row.setTag(holder); 
    } 
    else 
    { 
     holder = (WeatherHolder)row.getTag(); 
    } 

    Weather weather = data[position]; 
    holder.txtTitle.setText(weather.title); 
    holder.imgIcon.setImageResource(weather.icon); 

    return row; 
} 

static class WeatherHolder 
{ 
    ImageView imgIcon; 
    TextView txtTitle; 
} 
}