Interactive flip ImageView using ObjectAnimator

User touch on buttons to flip the ImageView forward/backward alternatively, around X-axis and Y-axis.

package com.example.androidflipview;

import android.animation.ObjectAnimator;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    Button buttonFlipX, buttonFlipY;
    ImageView imageView;
    boolean dirX = true;
    boolean dirY = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = (ImageView)findViewById(R.id.image);
        buttonFlipX = (Button)findViewById(R.id.buttonflipX);
        buttonFlipY = (Button)findViewById(R.id.buttonflipY);

        buttonFlipX.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                if(dirX){
                    dirX = false;
                    buttonFlipX.setText("Flip X Backward");
                    ObjectAnimator flip = ObjectAnimator.ofFloat(imageView, "rotationX", 0f, 180f);
                    flip.setDuration(500);
                    flip.start();
                }else{
                    dirX = true;
                    buttonFlipX.setText("Flip X Forward");
                    ObjectAnimator flip = ObjectAnimator.ofFloat(imageView, "rotationX", 180f, 0f);
                    flip.setDuration(1000);
                    flip.start();
                }
            }
        });

        buttonFlipY.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                if(dirY){
                    dirY = false;
                    buttonFlipY.setText("Flip Y Backward");
                    ObjectAnimator flip = ObjectAnimator.ofFloat(imageView, "rotationY", 0f, 180f);
                    flip.setDuration(2000);
                    flip.start();
                }else{
                    dirY = true;
                    buttonFlipY.setText("Flip Y Forward");
                    ObjectAnimator flip = ObjectAnimator.ofFloat(imageView, "rotationY", 180f, 0f);
                    flip.setDuration(3000);
                    flip.start();
                }
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">
a
    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="android-coding.blogspot.com"
        android:textSize="28dp"
        android:textStyle="bold" />

    <Button
        android:id="@+id/buttonflipX"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Flip X Forward" />
    <Button
        android:id="@+id/buttonflipY"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Flip Y Forward" />

    <ImageView
        android:id="@+id/image"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@mipmap/ic_launcher" />
</LinearLayout>