屏幕一侧的线条

Question

图像两侧可能有3px的原色。我不知道他们为什么在那里。我几乎尝试了一切。这是代码：

ref.setValue("I'm writing data", new Firebase.CompletionListener() {
  @Override
  public void onComplete(FirebaseError firebaseError, Firebase firebase) {
    if (firebaseError != null) {
      System.out.println("Data could not be saved. " + firebaseError.getMessage());
    } else {
      System.out.println("Data saved successfully.");
    }
  }
});

IMAGE