Permission Request (WRITE_EXTERNAL_STORAGE) doesn't show up

Android 6

I wrote the next code that checks for permissions and if there are no such permissions, it asks a user to give them.

private void checkDiskPermission ()
{
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
        Toast.makeText(this, "no disk access" , Toast.LENGTH_LONG).show();
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
    }
    else
    {
        Toast.makeText(this, "disk access - OK" , Toast.LENGTH_LONG).show();
    }

    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        Toast.makeText(this, "no GPS access" , Toast.LENGTH_LONG).show();
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 0);
    }
    else
    {
        Toast.makeText(this, "GPS access - OK" , Toast.LENGTH_LONG).show();
    }
}

This code works fine for GPS permissions, but not for WRITE_EXTERNAL_STORAGE permissions. A dialog appears in only one case.

Why can it be so?

Thanks!

Because you are requesting it for 2 times simultaneously. That's why it is taking last request.

The solution is that you have to ask both permission in one request

Like this-

private void checkDiskPermission ()
{
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
            && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
            && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        Toast.makeText(this, "No Permissions" , Toast.LENGTH_LONG).show();
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 0);
    }
    else
    {
        Toast.makeText(this, "Has Permissions" , Toast.LENGTH_LONG).show();
    }
}