Question

我正在尝试将包含图像源url字符串的数组发送到网格视图的imageadapter。但只有数组的最后一个url用于在适配器中设置图像。这里的一些帮助将不胜感激。

GridView gridview = (GridView) findViewById(R.id.gridview);
    ImageAdapter imageListAdapter = null;
    for( int inx = 0 ; inx < imageUrl.length ; inx++)
        {
                 imageListAdapter = new ImageAdapter(context,imageUrl[inx],productName[inx] );
                 System.out.println(imageUrl[inx]);
                 System.out.println(productName[inx]);
                 gridview.setAdapter(imageListAdapter);
        }

适配器代码：

public class ImageAdapter extends BaseAdapter {
private Context mContext;
static int i = 0;
String url = null;
String name = null;

public ImageAdapter(Context c, String url , String name ) {
    mContext = c;
    this.url = url;
    this.name = name;
}

public int getCount() {
    // return url.length;
    return ++i;
}

public Object getItem(int position) {
    return null;
}

public long getItemId(int position) {
    return 0;
}

// create a new ImageView for each item referenced by the Adapter
public View getView(final int position, View convertView, ViewGroup parent) {
    ImageView imageView;

    if (convertView == null) {  // if it's not recycled, initialise some attributes
        imageView = new ImageView(mContext);
        imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setPadding(8,8,8,8);
    } else {
        imageView = (ImageView) convertView;
    }
    //imageView.setImageResource(mThumbIds[position]);
    //Bitmap bmp  = loadBitmap("http://www.xvr.com/aero/planes/boeing/boeingf15.jpg");

    Bitmap bmp  = loadBitmap(url);
    System.out.println("in adapter :"+url);
    //imageView.setImageResource(mThumbIds[position]);
    imageView.setImageBitmap(bmp);
    return imageView;
}
public static Bitmap loadBitmap(String url) 
{
    Bitmap bitmap = null;
    InputStream in = null;
    BufferedOutputStream out = null;

    try {
        in = new BufferedInputStream(new URL(url).openStream(),  4 * 1024);

        final ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
        out = new BufferedOutputStream(dataStream,  4 * 1024);

        int byte_;
        while ((byte_ = in.read()) != -1)
            out.write(byte_);
        out.flush();

        final byte[] data = dataStream.toByteArray();
        BitmapFactory.Options options = new BitmapFactory.Options();
        //options.inSampleSize = 1;

        bitmap = BitmapFactory.decodeByteArray(data, 0, data.length,options);
    } catch (IOException e) {
        Log.e("","Could not load Bitmap from: " + url);
    } finally {
        try{
            in.close();
            out.close();
        }catch( IOException e )
        {
            System.out.println(e);
        }
    }
    return bitmap;
}

}

Answer 1

这是因为您每次都在for循环中创建新的ImageAdapter并将其设置为Gridview，因此在循环的最后一次迭代中，最后一个映像设置为adapter，最后该适配器设置为gridview。

注意：您的实施有误，请查看以下示例http://mobiforge.com/designing/story/understanding-user-interface-android-part-3-more-views并搜索关键字GridView

将url和name作为字符串数组传递一次，而不是每次创建ImageAdapter的新对象，如下所示，并相应地更改适配器代码。

imageListAdapter = new ImageAdapter(context,imageUrl,productName);

网格视图图像源问题

1 个答案: