ImageView 尺寸显示不正确

Question

我在显示正确大小的 ImageView 时遇到了问题。我读过的几乎所有帖子都涉及在布局文件中创建的 ImageView。但是，就我而言，我是以编程方式创建 ImageViews。

我正在尝试显示存储中特定文件夹中的所有图像。检索到的位图将放置在包含在 GridView 中的 ImageView 中。

这是我的代码：

//pass an array containing all images paths to adapter
imageGrid.setAdapter(new GridViewAdapter(getActivity(), FilePathStrings));

部分 GridVewAdapter 代码：

public View getView(int position, View convertView, ViewGroup parent) {
            ImageView imageView;

            if(convertView == null){
                imageView = new ImageView(mContext);
                imageView.setLayoutParams(new GridView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
                imageView.setScaleType(ImageView.ScaleType.FIT_XY);
                imageView.setPadding(5, 5, 5, 5);
                imageView.setAdjustViewBounds(true);

            }else{
                imageView = (ImageView) convertView;
            }

            imageView.setTag(filepath[position]);
            new LoadImages(imageView).execute();

            return imageView;
        }

AsyncTask 检索位图：

private class LoadImages extends AsyncTask<Object, Void, Bitmap> {

        private ImageView imgView;
        private String path;

        private LoadImages(ImageView imgView) {
            this.imgView = imgView;
            this.path = imgView.getTag().toString();
        }

        @Override
        protected Bitmap doInBackground(Object... params) {
            Bitmap bitmap = null;

            BitmapFactory.Options bmOptions = new BitmapFactory.Options();
            bmOptions.inJustDecodeBounds = false;
            bmOptions.inSampleSize = 6;

            bitmap = BitmapFactory.decodeFile(path, bmOptions);
            try {

                int dimension = getSquareCropDimensionForBitmap(bitmap);
                bitmap = ThumbnailUtils.extractThumbnail(bitmap, dimension, dimension);

            }catch (Exception e) {
                e.printStackTrace();
            }

            return bitmap;
        }

        @Override
        protected void onPostExecute(Bitmap result) {

            if (!imgView.getTag().toString().equals(path)) {
                return;
            }

            if(result != null && imgView != null){
                imgView.setVisibility(View.VISIBLE);
                imgView.setImageBitmap(result);

            }else{
                imgView.setVisibility(View.GONE);
            }
        }
    }

获得相等尺寸以使位图显示为正方形的方法：

private int getSquareCropDimensionForBitmap(Bitmap bitmap) {

           int dimension;
            //If the bitmap is wider than it is height then use the height as the square crop dimension

            if (bitmap.getWidth() >= bitmap.getHeight())    {
                dimension = bitmap.getHeight();
            }
            //If the bitmap is taller than it is width use the width as the square crop dimension

           else    {
                dimension = bitmap.getWidth();
            }
            return dimension;

    }

布局文件中的GridView：

    <GridView
    android:id="@+id/imageGridView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:columnWidth="30dp"
    android:numColumns="5"
    android:verticalSpacing="5dp"
    android:horizontalSpacing="5dp"
    android:stretchMode="columnWidth"
    android:gravity="center"
    android:layout_marginTop="30dp">

</GridView>

我得到的结果：

圈出的细"lines"其实就是展示的ImageView

非常感谢任何帮助。提前致谢！

Answer 1

<GridView
android:id="@+id/imageGridView"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"
android:verticalSpacing="5dp"
android:horizontalSpacing="5dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:layout_marginTop="30dp">

Answer 2

我在 GridView 上方有其他视图，所以我无法在 .xml 文件中将其高度设置为 fill_parent/match_parent，因为它会影响上面的视图。

我的问题的解决方案是以编程方式设置 GridView 的高度和宽度。

替换：

imageView.setLayoutParams(new GridView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

有了这个：

imageView.setLayoutParams(new GridView.LayoutParams(int height, int width));

解释：

Grid View doc

谁有更好的答案请post它 :)

ImageView 尺寸显示不正确

ImageView size is not displayed correctly

android

gridview

bitmap

imageview

android-gridview