android - GridView 只显示两列

Question

我以编程方式创建了一个要在对话框中使用的图像 GridView。如果我将列设置为自动调整，无论图像大小和屏幕大小如何，我总是会正好得到两列。如果我将列数强制为固定数量，那么它会起作用，但我无法避免图像在某些屏幕尺寸上重叠，因此自动管理列数会好得多。更重要的是，当我尝试设置拉伸(stretch)时，它根本不显示任何内容!

我的图像适配器:

public class ImageAdapter extends BaseAdapter {
private Context mContext;

// Constructor
public ImageAdapter(Context c){
    mContext = c;
}

public int getCount() {
    return (IconC.Res.length);
}

public Object getItem(int position) {
    return (IconC.Res[position]);
}

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

public View getView(int position, View convertView, ViewGroup parent) {
    ImageView imageView;
    if (convertView == null) {
        imageView = new ImageView(mContext);
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setLayoutParams(new GridView.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
    } else {
        imageView = (ImageView) convertView;
    }
    imageView.setImageResource(IconC.Res[position]);
    return (imageView);
}
 }

创建对话框的函数(在别处用 .show() 调用)

    private void createPopUp() {
    d_icons = new Dialog(this);
    GridView gv_icons = new GridView(this);

//  gv_icons.setNumColumns(GridView.AUTO_FIT);  // autofit disabled, shows ONLY TWO COLUMNS
    gv_icons.setNumColumns(4); // instead, autofit forced, now it works, but I don't want it fixed!
    gv_icons.setGravity(Gravity.CENTER);
    gv_icons.setHorizontalSpacing(3);
    gv_icons.setVerticalSpacing(1);
//  gv_icons.setStretchMode(GridView.STRETCH_SPACING);  // stretching disabled, shows ZERO COLUMNS
    gv_icons.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
    gv_icons.setAdapter(new ImageAdapter(this));
    gv_icons.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        public void onItemClick (AdapterView<?> parent, View view, int position, long id) {
            eventIcons.set(selectedItem, position);
            updateEventView();
            d_icons.dismiss();
        }
    });

    d_icons.setTitle(R.string.text_chooseicon);
    d_icons.addContentView(gv_icons, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
    d_icons.setCancelable(true);
}

谁能看出为什么会这样？谢谢!!

这是它在 4 个固定列中的显示方式:i50.tinypic.com/2ebdfec.png

以下是自动调整的情况:i50.tinypic.com/25jxo9s.png

这是在水平选项卡上自动调整的布局:i49.tinypic.com/23r7qj5.png

Answer 1

这篇文章回答了您的问题: Android: How does GridView auto_fit find the number of columns?

为了使 auto_fit 起作用，您需要指定列宽:gridView.setColumnWidth(宽度);