在Android中通过url下载图片

// 导入相关库
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;

// 在Activity或Fragment中调用该方法进行图片下载和展示
public void downloadImage(String imageUrl, ImageView imageView) {
    new DownloadImageTask(imageView).execute(imageUrl);
}

// 异步任务类，用于在后台线程中下载图片并在主线程中更新UI
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
    private ImageView imageView;

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

    @Override
    protected Bitmap doInBackground(String... params) {
        String imageUrl = params[0];
        Bitmap bitmap = null;
        try {
            URL url = new URL(imageUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream input = connection.getInputStream();
            bitmap = BitmapFactory.decodeStream(input);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bitmap;
    }

    @Override
    protected void onPostExecute(Bitmap bitmap) {
        if (bitmap != null) {
            imageView.setImageBitmap(bitmap);
        }
    }
}