getExternalFilesDir permissions

问题

My application is live on Play Store, I noticed that I was not asking permissions when calling:

File savedImagesDirectory = getBaseContext.getExternalFilesDir("SavedImages");
if(savedImagesDirectory != null) {
    if (!savedImagesDirectory.exists()) {
        if (savedImagesDirectory.mkdir()) ; //directory is created;
    }
}

Strange thing is, I'm not getting any crashes when calling this without runtime permissions. I tested on my device running Nougat and the files are created and I experienced no crashes.

I only have permissions in my Manifest, but I don't ask runtime permissions.

I've seen A LOT of answers on SO that say that runtime permissions should be asked when creating a folder/file in external file directory.

My question:

Should I ask runtime permissions when calling the above? If yes, why am I not experiencing any crashes?

It would also be helpful if someone can provide a link where I can read up about this.

回答1:

Although it returns path to external storage, you don't need permission to access directory returned by getExternalFilesDir().

It is same as getFilesDir() but it is public to other apps as well.

Also note that if you write anything in that directory and clear app data or uninstall the app, everything will be deleted.

For more information, read the documentation at https://developer.android.com/reference/android/content/Context.html#getExternalFilesDir(java.lang.String)

回答2:

String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
requestPermissions(permissions, WRITE_REQUEST_CODE);

use this code

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] 
grantResults) {
switch (requestCode) {
   case WRITE_REQUEST_CODE:
     if(grantResults[0] == PackageManager.PERMISSION_GRANTED){
       //Granted.


     }
   else{
       //Denied.
     }
    break;
}
}

来源：https://stackoverflow.com/questions/52437112/getexternalfilesdir-permissions

标签

java

android

android-permissions