Android:从图库获取图片,在recycler适配器中显示它们。
创始人
2024-10-13 10:01:10
0

下面是获取图库图片并在recycler适配器中显示它们的示例代码:

1.在AndroidManifest.xml文件中包含以下权限:

2.创建一个方法来获取图库中的所有图像:

private ArrayList getAllImages(){ ArrayList imagesList = new ArrayList<>(); Uri collection; collection = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

String[] projection = new String[]{
        MediaStore.Images.Media._ID,
        MediaStore.Images.Media.DISPLAY_NAME,
        MediaStore.Images.Media.DATE_ADDED,
        MediaStore.Images.Media.DATA
};

Cursor cursor = getContentResolver().query(collection, projection, null, null, null);

if (cursor != null && cursor.moveToFirst()) {
    do {
        int imageId = Integer.parseInt(cursor.getString(cursor.getColumnIndex(projection[0])));
        Uri imageUri = Uri.withAppendedPath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "" + imageId);
        imagesList.add(imageUri);
    } while (cursor.moveToNext());
    cursor.close();
}

return imagesList;

}

3.通过以下代码将Uri转化为Bitmap:

private Bitmap uriToBitmap(Uri uri) throws IOException { return MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri); }

4.将上述方法放在RecyclerView适配器的构造函数中,以便可以立即获取图像并在列表中显示它们:

public ImageAdapter(Context context) { this.context = context; this.images = getAllImages(); }

5.我们现在需要在ViewHolder类中设置ImageView,以便将图像显示在它们的位置上。在bind()方法中添加以下代码:

private ImageView imageView;

public ImageViewHolder(View view) { super(view); imageView = view.findViewById(R.id.image); }

public void bind(Uri imageUri) { try { Bitmap bitmap = uriToBitmap(imageUri); imageView.setImageBitmap(bitmap); } catch (IOException e) { e.printStackTrace(); }
}

6.现在,RecyclerView适配器完整的代码应该如下所示:

public class ImageAdapter extends RecyclerView

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