java - Gridview 的 URI 列表

Question

我正在开发一个应用程序，该应用程序从图库中选择图像列表，并应在发送到服务器之前显示图像，该服务器已经使用改造运行。

此选择返回 List<URI> 中的列表,就像下面的代码一样:

Button uploadBtn = findViewById(R.id.btn_button);
uploadBtn.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            Intent intent = new Intent();
            intent.setType("image/*");
            intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE,true);
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent,"Escolha a imagem"),PICK_IMAGE);
        }

    });

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == PICK_IMAGE && resultCode == RESULT_OK && data != null){

        ClipData clipData = data.getClipData();
        ArrayList<Uri> fileUris = new ArrayList<>();

        if (clipData == null){
            Uri uri = data.getData();
            fileUris.add(uri);
        } else {
            for (int i = 0; i < clipData.getItemCount(); i++) {
                ClipData.Item item = clipData.getItemAt(i);
                Uri uri = item.getUri();
                fileUris.add(uri);
            }
        }
        uploadAlbum(fileUris);
    }

我想知道是否可以使用此列表来填充 GridView 以及如何做到这一点。

提前致谢

Answer 1

我找到了一个解决方案，就是使用以下代码将 URI 解析为 BITMAP:

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == PICK_IMAGE && resultCode == RESULT_OK && data != null){

        ClipData clipData = data.getClipData();
        fileUris = new ArrayList<>();
        images = new ArrayList<>();

        for (int i = 0; i < clipData.getItemCount(); i++) {
            ClipData.Item item = clipData.getItemAt(i);
            Uri uri = item.getUri();
            fileUris.add(uri);
            try {
                images.add(MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri));
                gridView.setVisibility(View.VISIBLE);
                gridView.setAdapter(new ImageAdapter(this, images));

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

我的自定义 GridviewAdapter:

public class ImageAdapter extends BaseAdapter {
    private Context mContext;
    private ArrayList<Bitmap> imagens;

    // Constructor
    public ImageAdapter(Context c, ArrayList<Bitmap> images) {
        mContext = c;
        this.imagens = images;
    }

    public int getCount() {
        return imagens.size();
    }

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return 0;
    }

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;

        if (convertView == null) {
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(8, 8, 8, 8);
        }
        else
        {
            imageView = (ImageView) convertView;
        }
        imageView.setImageBitmap(images.get(position));
        return imageView;
    }


}