Google 相机应用如何在不请求存储权限的情况下保存照片？

Question

官方 Google 相机应用程序（https://github.com/android/camera-samples/tree/main/CameraXBasic) does not ask for any storage permissions. So, how does it save the photos to the device? just look at the AndroidManifest.xml file: https://github.com/android/camera-samples/blob/main/CameraXBasic/app/src/main/AndroidManifest.xml 如您所见，它不要求存储权限。

Answer 1

如果你看看他们的 getOutputDirectory method:

fun getOutputDirectory(context: Context): File {
    val appContext = context.applicationContext
    val mediaDir = context.externalMediaDirs.firstOrNull()?.let {
        File(it, appContext.resources.getString(R.string.app_name)).apply { mkdirs() } }
    return if (mediaDir != null && mediaDir.exists())
        mediaDir else appContext.filesDir
}

他们正在使用 getExternalMediaDirs() and, if none are available (which isn't ever the case in reality), getFilesDir()，并且在他们的文档中特别提到了这两种方法：

No additional permissions are required for the calling app to read or write files under the returned path.

Google 相机应用如何在不请求存储权限的情况下保存照片？

How does the Google camera app save photos without asking for a storage permission?

java

storage

android

kotlin