Android-如何使用自定义名称保存完整的照片？

String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "IMG_" + timeStamp + ".jpg";

File storageDir = Environment.getExternalStoragePublicDirectory(
        Environment.DIRECTORY_PICTURES);
File imageFile = new File(storageDir, imageFileName);

// 保存照片
try {
    FileOutputStream fos = new FileOutputStream(imageFile);
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
    fos.flush();
    fos.close();
} catch (IOException e) {
    e.printStackTrace();
}

// 将照片添加到媒体库
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
Uri contentUri = Uri.fromFile(imageFile);
mediaScanIntent.setData(contentUri);
context.sendBroadcast(mediaScanIntent);