RuntimePermission.java

// Here, thisActivity is the current activity
if (ContextCompat.checkSelfPermission(thisActivity,
                Manifest.permission.READ_CONTACTS)
        != PackageManager.PERMISSION_GRANTED) {
    // Should we show an explanation?
    if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
            Manifest.permission.READ_CONTACTS)) {
        // Show an expanation to the user *asynchronously* -- don't block
        // this thread waiting for the user's response! After the user
        // sees the explanation, try again to request the permission.
    } else {
         if(isFirstTimeAskingPermission(thisActivity, Manifest.permission.READ_CONTACTS){ 
           
          firstTimeAskingPermission(thisActivity, Manifest.permission.READ_CONTACTS, false);
           
          // No explanation needed, we can request the permission.
          ActivityCompat.requestPermissions(thisActivity,
                new String[]{Manifest.permission.READ_CONTACTS},
                MY_PERMISSIONS_REQUEST_READ_CONTACTS);
          // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
          // app-defined int constant. The callback method gets the
          // result of the request.           
         } else {
          //Permission disable by device policy or user denied permanently. Show proper error message
         }
    }
} else {
  //permission granted. do your stuff
}