如何获取适配器内的视图高度以创建大小的位图？

Question

我使用自定义CursorAdapter与自定义项目.我需要视图高度来从资源文件夹调整Bitmap的大小,并将此调整大小的位图设置为列表项中的ImegeView;

 @Override
public void bindView(View view, final Context context, final Cursor cursor) {
    final ViewHolder holder = (ViewHolder) view.getTag();

    final int imgCol = cursor.getColumnIndex(TableOdelice.COLUMN_URL);
    int titleCol = cursor.getColumnIndex(TableOdelice.COLUMN_TITRE);
    final int themeCol = cursor.getColumnIndex(TableOdelice.COLUMN_THEME);

    String tempPath = getPath(cursor.getString(themeCol), cursor.getString(imgCol));
    final String path = tempPath.replace(".", "c.");
    String[] arr = cursor.getString(titleCol).split("\\*");
    holder.title.setText(arr[0]);
    holder.subTitle.setText(arr[1]);

    if (itemHeight > 0) {
        showThumb(itemHeight, holder.img, path);
    } else {
        final ImageView v = holder.mainImage;
        v.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                itemHeight = v.getHeight();
                showThumb(itemHeight, holder.img, path);
            }
        });
    }
}

  private void showThumb(int height, final ImageView iv, final String path) {
    if (thumbs.containsKey(path)) {
        iv.setImageBitmap(thumbs.get(path));
    } else {
        InputStream is = null;
        try {
            is = context.getAssets().open(path);
        } catch (IOException e) {
            Log.d("no file at path", path);
            e.printStackTrace();
        }
        if (is != null) {
                Bitmap btm = btmHelper.scaleToHeight(BitmapFactory.decodeStream(is);, height);
            thumbs.put(path, btm);
            iv.setImageBitmap(btm);

        }
    }

}

为了获得视图高度,我使用视图的OnGlobalLayoutListener().

但它很慢......有什么想法吗？

Answer 1

我找到了问题的答案.使用这种结构,我在每个视图的适配器内获得正确的视图宽度或高度.

final ImageView v = holder.mainImage;
            v.post(new Runnable() {
            @Override
            public void run() {
                itemHeight = v.getHeight();
                Log.d("Height", "" + itemHeight);
            }

        });
    }

也许它会帮助某人:)