从imageView中的url显示pdf的第一页

// 导入所需的库
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.widget.ImageView;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

// 异步任务，用于从url获取pdf文件内容并转换为图片
private class LoadPdfImageTask extends AsyncTask<String, Void, Bitmap> {
    private ImageView imageView;

    public LoadPdfImageTask(ImageView imageView) {
        this.imageView = imageView;
    }

    @Override
    protected Bitmap doInBackground(String... urls) {
        String pdfUrl = urls[0];
        Bitmap pdfImage = null;

        try {
            // 创建URL对象并打开连接
            URL url = new URL(pdfUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.connect();

            // 从连接中获取输入流
            InputStream input = connection.getInputStream();

            // 将输入流转换为Bitmap对象
            pdfImage = BitmapFactory.decodeStream(input);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return pdfImage;
    }

    @Override
    protected void onPostExecute(Bitmap result) {
        // 将转换后的图片设置到imageView中显示
        imageView.setImageBitmap(result);
    }
}

// 在适当的地方调用LoadPdfImageTask来加载pdf图片
ImageView imageView = findViewById(R.id.imageView);
String pdfUrl = "https://example.com/path/to/pdf.pdf";
new LoadPdfImageTask(imageView).execute(pdfUrl);