在GrivView的BaseAdapter绝对位置 [英] Absolute position in BaseAdapter of GrivView

问题描述

我想写 BaseAdapter 我的 GrivView 但在

public View getView(int position, View convertView, ViewGroup parent) { ... }

在位置而呈现下一个内容是：

the position while rendering next elements is:

visible elements
---------------
|  1   2   3  |
|  4   5   6  | <--- screen
|  7   8   9  |
---------------

nonvisible elements
|  1   2   3  | <-- below visible area
|  4   5   6  |

在这里真正是：

where real is:

visible elements
---------------
|  1   2   3  |
|  4   5   6  | 
|  7   8   9  |
---------------

nonvisible elements
| 10  11  12  |
| 13  14  15  | 

我知道这是正确的行为（它计数唯一可见的元素），但如何让项目在列表中的实际位置？要不怎么知道我应该回到它的布局？

I'm aware it's correct behaviour (it counts only visible elements), but how to get the real position of item on list? Or how to know which layout should I return?

修改：但是返回的数量更比随机我发现，即使是在屏幕上

EDIT: However the returned number are much more random than I showed, even on screen.

推荐答案

使用 BaseAdapter 酷似<一href="http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/List14.html"相对=nofollow>谷歌Documentatnion 显示效果还算不错。

Using BaseAdapter exactly like Google Documentatnion shows works fine.

我的问题是：

• 不会使用ViewHolder

• NOT using ViewHolder

或试图在viewHolder持有ID

or trying to hold id in viewHolder

我应该使用 ViewHolder 如下：

public View getView(int position, View convertView, ViewGroup parent) {
    // create holder
    ViewHolder holder; // check if layout exists

    if (convertView == null) { // if it's not recycled, initialize some

        LayoutInflater inflater = LayoutInflater.from(mContext);
        convertView = (LinearLayout) inflater.inflate(R.layout.card_prev,
                null);

        // Create layout elements
        ImageView image = (ImageView) convertView
                .findViewById(R.id.imageViewThumbnail);

        TextView desc = (TextView) convertView
                .findViewById(R.id.textViewDescription);


        // Place layout elements in holder
        holder = new ViewHolder();
        holder.id = position;
        holder.preview = image;
        holder.text = desc;

        convertView.setTag(holder);
    } else {
        // Get existing holder
        holder = (ViewHolder) convertView.getTag();
    }

    // Update layout here using layout elements from holder
    String imageName = "image_" + (position + 1);
    final int imageId = mContext.getResources().getIdentifier(imageName,
            "drawable", "com.myapp");

    holder.text.setText("" + (position+1));

    holder.preview.setImageResource(imageId);

    holder.preview.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent fullScreenIntent = new Intent(v.getContext(),
                    FullScreenImage.class);
            fullScreenIntent.putExtra("imageRes", imageId);

            MainMenuActivity.currentShownActivity
                    .startActivity(fullScreenIntent);

        }
    });

    return convertView;
}

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