android url图片保存到相册

您可以使用以下代码将URL中的图片保存到相册：

// 异步下载图片
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {

    @Override
    protected Bitmap doInBackground(String... urls) {
        String imageUrl = urls[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 (IOException e) {
            e.printStackTrace();
        }
        return bitmap;
    }

    @Override
    protected void onPostExecute(Bitmap result) {
        // 保存图片到相册
        saveImageToGallery(result);
    }
}

// 保存图片到相册
private void saveImageToGallery(Bitmap bitmap) {
    String fileName = System.currentTimeMillis() + ".jpg";
    File fileDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
    File imageFile = new File(fileDir, fileName);
    try {
        FileOutputStream fos = new FileOutputStream(imageFile);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
        fos.flush();
        fos.close();
        // 发送广播通知相册更新
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri uri = Uri.fromFile(imageFile);
        intent.setData(uri);
        sendBroadcast(intent);
        Toast.makeText(this, "图片已保存到相册", Toast.LENGTH_SHORT).show();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

// 调用异步下载图片的方法
new DownloadImageTask().execute(imageUrl);

请注意，您需要在AndroidManifest.xml文件中添加以下权限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />