HandlingNeverAskAgain.java

if (ContextCompat.checkSelfPermission(thisActivity,Manifest.permission.READ_CONTACTS)!= PackageManager.PERMISSION_GRANTED) {
    if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
            Manifest.permission.READ_CONTACTS)) {
        // Show an expanation to the user
    } else {
         if(isFirstTimeAsking(thisActivity, Manifest.permission.READ_CONTACTS){
               firstTimeAsking(thisActivity,Manifest.permission.READ_CONTACTS, false);
               ActivityCompat.requestPermissions(thisActivity,new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA); 
         } else {
               //Permission disable by device policy or user denied permanently. Show proper error message
                }
    }
} else {
  //permission granted. do your stuff
}